initial-setup: include systemd unit in vars

The helper is just bytes->str conversion with errors=backslashreplace,
which we can use for more than just paths.

.gitea/README.md

@@ -0,0 +1 @@
+../templates/README.md

.gitignore

@@ -1,7 +1,9 @@
+.venv
 *.html
-Borg.bin
 cache/
 config/
 key.txt
 passphrase
 ssh/
+/README.md
+/notify.sh

Makefile

@@ -19,7 +19,7 @@ ctrl: test-backup
 .PHONY: test-backup
 test-backup: .venv
 	.venv/bin/mypy backup.py
-	./backup.py | tr '\0' '\n' #-n
+	./backup.py -n
 
 .PHONY: test-setup
 test-setup:
@@ -31,6 +31,27 @@ test-setup:
 	#git ls-files -z | tar --null -T - -cf - | tar -C /tmp/test-borg -xvf -
 	/tmp/test-borg/initial-setup.sh
 
+# Pull master and rebase "setup-$HOSTNAME" branch onto it
+.PHONY: rebase
+rebase:
+	git checkout master
+	git pull
+	git checkout -
+	git rebase master
+	./initial-setup.sh --update
+	systemctl daemon-reload
+	git status
+
+# Show status of most recent backup run
+.PHONY: status
+status:
+	systemctl status --full --lines 999999 --no-pager --all borg-backup || true
+
+# Watch live log output
+.PHONY: tail
+tail:
+	journalctl --all --follow --lines 200 --unit borg-backup
+
 .PHONY: clean
 clean:
 	rm -f README.html

Pipfile.lock

@@ -18,10 +18,11 @@
     "default": {
         "bracex": {
             "hashes": [
-                "sha256:01f715cd0ed7a622ec8b32322e715813f7574de531f09b70f6f3b2c10f682425",
-                "sha256:64e2a6d14de9c8e022cf40539ac8468ba7c4b99550a2b05fc87fd20e392e568f"
+                "sha256:a27eaf1df42cf561fed58b7a8f3fdf129d1ea16a81e1fadd1d17989bc6384beb",
+                "sha256:efdc71eff95eaff5e0f8cfebe7d01adf2c8637c8c92edaf63ef348c241a82418"
             ],
-            "version": "==2.1.1"
+            "markers": "python_version >= '3.8'",
+            "version": "==2.4"
         },
         "humanfriendly": {
             "hashes": [
@@ -33,107 +34,126 @@
         },
         "pyyaml": {
             "hashes": [
-                "sha256:08682f6b72c722394747bddaf0aa62277e02557c0fd1c42cb853016a38f8dedf",
-                "sha256:0f5f5786c0e09baddcd8b4b45f20a7b5d61a7e7e99846e3c799b05c7c53fa696",
-                "sha256:129def1b7c1bf22faffd67b8f3724645203b79d8f4cc81f674654d9902cb4393",
-                "sha256:294db365efa064d00b8d1ef65d8ea2c3426ac366c0c4368d930bf1c5fb497f77",
-                "sha256:3b2b1824fe7112845700f815ff6a489360226a5609b96ec2190a45e62a9fc922",
-                "sha256:3bd0e463264cf257d1ffd2e40223b197271046d09dadf73a0fe82b9c1fc385a5",
-                "sha256:4465124ef1b18d9ace298060f4eccc64b0850899ac4ac53294547536533800c8",
-                "sha256:49d4cdd9065b9b6e206d0595fee27a96b5dd22618e7520c33204a4a3239d5b10",
-                "sha256:4e0583d24c881e14342eaf4ec5fbc97f934b999a6828693a99157fde912540cc",
-                "sha256:5accb17103e43963b80e6f837831f38d314a0495500067cb25afab2e8d7a4018",
-                "sha256:607774cbba28732bfa802b54baa7484215f530991055bb562efbed5b2f20a45e",
-                "sha256:6c78645d400265a062508ae399b60b8c167bf003db364ecb26dcab2bda048253",
-                "sha256:72a01f726a9c7851ca9bfad6fd09ca4e090a023c00945ea05ba1638c09dc3347",
-                "sha256:74c1485f7707cf707a7aef42ef6322b8f97921bd89be2ab6317fd782c2d53183",
-                "sha256:895f61ef02e8fed38159bb70f7e100e00f471eae2bc838cd0f4ebb21e28f8541",
-                "sha256:8c1be557ee92a20f184922c7b6424e8ab6691788e6d86137c5d93c1a6ec1b8fb",
-                "sha256:bb4191dfc9306777bc594117aee052446b3fa88737cd13b7188d0e7aa8162185",
-                "sha256:bfb51918d4ff3d77c1c856a9699f8492c612cde32fd3bcd344af9be34999bfdc",
-                "sha256:c20cfa2d49991c8b4147af39859b167664f2ad4561704ee74c1de03318e898db",
-                "sha256:cb333c16912324fd5f769fff6bc5de372e9e7a202247b48870bc251ed40239aa",
-                "sha256:d2d9808ea7b4af864f35ea216be506ecec180628aced0704e34aca0b040ffe46",
-                "sha256:d483ad4e639292c90170eb6f7783ad19490e7a8defb3e46f97dfe4bacae89122",
-                "sha256:dd5de0646207f053eb0d6c74ae45ba98c3395a571a2891858e87df7c9b9bd51b",
-                "sha256:e1d4970ea66be07ae37a3c2e48b5ec63f7ba6804bdddfdbd3cfd954d25a82e63",
-                "sha256:e4fac90784481d221a8e4b1162afa7c47ed953be40d31ab4629ae917510051df",
-                "sha256:fa5ae20527d8e831e8230cbffd9f8fe952815b2b7dae6ffec25318803a7528fc",
-                "sha256:fd7f6999a8070df521b6384004ef42833b9bd62cfee11a09bda1079b4b704247",
-                "sha256:fdc842473cd33f45ff6bce46aea678a54e3d21f1b61a7750ce3c498eedfe25d6",
-                "sha256:fe69978f3f768926cfa37b867e3843918e012cf83f680806599ddce33c2c68b0"
+                "sha256:04ac92ad1925b2cff1db0cfebffb6ffc43457495c9b3c39d3fcae417d7125dc5",
+                "sha256:062582fca9fabdd2c8b54a3ef1c978d786e0f6b3a1510e0ac93ef59e0ddae2bc",
+                "sha256:0d3304d8c0adc42be59c5f8a4d9e3d7379e6955ad754aa9d6ab7a398b59dd1df",
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+                "sha256:18aeb1bf9a78867dc38b259769503436b7c72f7a1f1f4c93ff9a17de54319b27",
+                "sha256:1d4c7e777c441b20e32f52bd377e0c409713e8bb1386e1099c2415f26e479595",
+                "sha256:1e2722cc9fbb45d9b87631ac70924c11d3a401b2d7f410cc0e3bbf249f2dca62",
+                "sha256:1fe35611261b29bd1de0070f0b2f47cb6ff71fa6595c077e42bd0c419fa27b98",
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+                "sha256:326c013efe8048858a6d312ddd31d56e468118ad4cdeda36c719bf5bb6192290",
+                "sha256:40df9b996c2b73138957fe23a16a4f0ba614f4c0efce1e9406a184b6d07fa3a9",
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+                "sha256:49a183be227561de579b4a36efbb21b3eab9651dd81b1858589f796549873dd6",
+                "sha256:4fb147e7a67ef577a588a0e2c17b6db51dda102c71de36f8549b6816a96e1867",
+                "sha256:50550eb667afee136e9a77d6dc71ae76a44df8b3e51e41b77f6de2932bfe0f47",
+                "sha256:510c9deebc5c0225e8c96813043e62b680ba2f9c50a08d3724c7f28a747d1486",
+                "sha256:5773183b6446b2c99bb77e77595dd486303b4faab2b086e7b17bc6bef28865f6",
+                "sha256:596106435fa6ad000c2991a98fa58eeb8656ef2325d7e158344fb33864ed87e3",
+                "sha256:6965a7bc3cf88e5a1c3bd2e0b5c22f8d677dc88a455344035f03399034eb3007",
+                "sha256:69b023b2b4daa7548bcfbd4aa3da05b3a74b772db9e23b982788168117739938",
+                "sha256:6c22bec3fbe2524cde73d7ada88f6566758a8f7227bfbf93a408a9d86bcc12a0",
+                "sha256:704219a11b772aea0d8ecd7058d0082713c3562b4e271b849ad7dc4a5c90c13c",
+                "sha256:7e07cbde391ba96ab58e532ff4803f79c4129397514e1413a7dc761ccd755735",
+                "sha256:81e0b275a9ecc9c0c0c07b4b90ba548307583c125f54d5b6946cfee6360c733d",
+                "sha256:855fb52b0dc35af121542a76b9a84f8d1cd886ea97c84703eaa6d88e37a2ad28",
+                "sha256:8d4e9c88387b0f5c7d5f281e55304de64cf7f9c0021a3525bd3b1c542da3b0e4",
+                "sha256:9046c58c4395dff28dd494285c82ba00b546adfc7ef001486fbf0324bc174fba",
+                "sha256:9eb6caa9a297fc2c2fb8862bc5370d0303ddba53ba97e71f08023b6cd73d16a8",
+                "sha256:a0cd17c15d3bb3fa06978b4e8958dcdc6e0174ccea823003a106c7d4d7899ac5",
+                "sha256:afd7e57eddb1a54f0f1a974bc4391af8bcce0b444685d936840f125cf046d5bd",
+                "sha256:b1275ad35a5d18c62a7220633c913e1b42d44b46ee12554e5fd39c70a243d6a3",
+                "sha256:b786eecbdf8499b9ca1d697215862083bd6d2a99965554781d0d8d1ad31e13a0",
+                "sha256:ba336e390cd8e4d1739f42dfe9bb83a3cc2e80f567d8805e11b46f4a943f5515",
+                "sha256:baa90d3f661d43131ca170712d903e6295d1f7a0f595074f151c0aed377c9b9c",
+                "sha256:bc1bf2925a1ecd43da378f4db9e4f799775d6367bdb94671027b73b393a7c42c",
+                "sha256:bd4af7373a854424dabd882decdc5579653d7868b8fb26dc7d0e99f823aa5924",
+                "sha256:bf07ee2fef7014951eeb99f56f39c9bb4af143d8aa3c21b1677805985307da34",
+                "sha256:bfdf460b1736c775f2ba9f6a92bca30bc2095067b8a9d77876d1fad6cc3b4a43",
+                "sha256:c8098ddcc2a85b61647b2590f825f3db38891662cfc2fc776415143f599bb859",
+                "sha256:d2b04aac4d386b172d5b9692e2d2da8de7bfb6c387fa4f801fbf6fb2e6ba4673",
+                "sha256:d483d2cdf104e7c9fa60c544d92981f12ad66a457afae824d146093b8c294c54",
+                "sha256:d858aa552c999bc8a8d57426ed01e40bef403cd8ccdd0fc5f6f04a00414cac2a",
+                "sha256:e7d73685e87afe9f3b36c799222440d6cf362062f78be1013661b00c5c6f678b",
+                "sha256:f003ed9ad21d6a4713f0a9b5a7a0a79e08dd0f221aff4525a2be4c346ee60aab",
+                "sha256:f22ac1c3cac4dbc50079e965eba2c1058622631e526bd9afd45fedd49ba781fa",
+                "sha256:faca3bdcf85b2fc05d06ff3fbc1f83e1391b3e724afa3feba7d13eeab355484c",
+                "sha256:fca0e3a251908a499833aa292323f32437106001d436eca0e6e7833256674585",
+                "sha256:fd1592b3fdf65fff2ad0004b5e363300ef59ced41c2e6b3a99d4089fa8c5435d",
+                "sha256:fd66fc5d0da6d9815ba2cebeb4205f95818ff4b79c3ebe268e75d961704af52f"
             ],
             "index": "pypi",
-            "version": "==5.4.1"
+            "version": "==6.0.1"
         },
         "wcmatch": {
             "hashes": [
-                "sha256:4d54ddb506c90b5a5bba3a96a1cfb0bb07127909e19046a71d689ddfb18c3617",
-                "sha256:9146b1ab9354e0797ef6ef69bc89cb32cb9f46d1b9eeef69c559aeec8f3bffb6"
+                "sha256:14554e409b142edeefab901dc68ad570b30a72a8ab9a79106c5d5e9a6d241bd5",
+                "sha256:86c17572d0f75cbf3bcb1a18f3bf2f9e72b39a9c08c9b4a74e991e1882a8efb3"
             ],
             "index": "pypi",
-            "version": "==8.2"
+            "version": "==8.5"
         }
     },
     "develop": {
         "mypy": {
             "hashes": [
-                "sha256:088cd9c7904b4ad80bec811053272986611b84221835e079be5bcad029e79dd9",
-                "sha256:0aadfb2d3935988ec3815952e44058a3100499f5be5b28c34ac9d79f002a4a9a",
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-                "sha256:3c4b8ca36877fc75339253721f69603a9c7fdb5d4d5a95a1a1b899d8b86a4de2",
-                "sha256:3e382b29f8e0ccf19a2df2b29a167591245df90c0b5a2542249873b5c1d78212",
-                "sha256:42c266ced41b65ed40a282c575705325fa7991af370036d3f134518336636f5b",
-                "sha256:53fd2eb27a8ee2892614370896956af2ff61254c275aaee4c230ae771cadd885",
-                "sha256:704098302473cb31a218f1775a873b376b30b4c18229421e9e9dc8916fd16150",
-                "sha256:7df1ead20c81371ccd6091fa3e2878559b5c4d4caadaf1a484cf88d93ca06703",
-                "sha256:866c41f28cee548475f146aa4d39a51cf3b6a84246969f3759cb3e9c742fc072",
-                "sha256:a155d80ea6cee511a3694b108c4494a39f42de11ee4e61e72bc424c490e46457",
-                "sha256:adaeee09bfde366d2c13fe6093a7df5df83c9a2ba98638c7d76b010694db760e",
-                "sha256:b6fb13123aeef4a3abbcfd7e71773ff3ff1526a7d3dc538f3929a49b42be03f0",
-                "sha256:b94e4b785e304a04ea0828759172a15add27088520dc7e49ceade7834275bedb",
-                "sha256:c0df2d30ed496a08de5daed2a9ea807d07c21ae0ab23acf541ab88c24b26ab97",
-                "sha256:c6c2602dffb74867498f86e6129fd52a2770c48b7cd3ece77ada4fa38f94eba8",
-                "sha256:ceb6e0a6e27fb364fb3853389607cf7eb3a126ad335790fa1e14ed02fba50811",
-                "sha256:d9dd839eb0dc1bbe866a288ba3c1afc33a202015d2ad83b31e875b5905a079b6",
-                "sha256:e4dab234478e3bd3ce83bac4193b2ecd9cf94e720ddd95ce69840273bf44f6de",
-                "sha256:ec4e0cd079db280b6bdabdc807047ff3e199f334050db5cbb91ba3e959a67504",
-                "sha256:ecd2c3fe726758037234c93df7e98deb257fd15c24c9180dacf1ef829da5f921",
-                "sha256:ef565033fa5a958e62796867b1df10c40263ea9ded87164d67572834e57a174d"
+                "sha256:19f905bcfd9e167159b3d63ecd8cb5e696151c3e59a1742e79bc3bcb540c42c7",
+                "sha256:21a1ad938fee7d2d96ca666c77b7c494c3c5bd88dff792220e1afbebb2925b5e",
+                "sha256:40b1844d2e8b232ed92e50a4bd11c48d2daa351f9deee6c194b83bf03e418b0c",
+                "sha256:41697773aa0bf53ff917aa077e2cde7aa50254f28750f9b88884acea38a16169",
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+                "sha256:4c46b51de523817a0045b150ed11b56f9fff55f12b9edd0f3ed35b15a2809de0",
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+                "sha256:4d01c00d09a0be62a4ca3f933e315455bde83f37f892ba4b08ce92f3cf44bcc1",
+                "sha256:59a0d7d24dfb26729e0a068639a6ce3500e31d6655df8557156c51c1cb874ce7",
+                "sha256:68351911e85145f582b5aa6cd9ad666c8958bcae897a1bfda8f4940472463c45",
+                "sha256:7274b0c57737bd3476d2229c6389b2ec9eefeb090bbaf77777e9d6b1b5a9d143",
+                "sha256:81af8adaa5e3099469e7623436881eff6b3b06db5ef75e6f5b6d4871263547e5",
+                "sha256:82e469518d3e9a321912955cc702d418773a2fd1e91c651280a1bda10622f02f",
+                "sha256:8b27958f8c76bed8edaa63da0739d76e4e9ad4ed325c814f9b3851425582a3cd",
+                "sha256:8c223fa57cb154c7eab5156856c231c3f5eace1e0bed9b32a24696b7ba3c3245",
+                "sha256:8f57e6b6927a49550da3d122f0cb983d400f843a8a82e65b3b380d3d7259468f",
+                "sha256:925cd6a3b7b55dfba252b7c4561892311c5358c6b5a601847015a1ad4eb7d332",
+                "sha256:a43ef1c8ddfdb9575691720b6352761f3f53d85f1b57d7745701041053deff30",
+                "sha256:a8032e00ce71c3ceb93eeba63963b864bf635a18f6c0c12da6c13c450eedb183",
+                "sha256:b96ae2c1279d1065413965c607712006205a9ac541895004a1e0d4f281f2ff9f",
+                "sha256:bb8ccb4724f7d8601938571bf3f24da0da791fe2db7be3d9e79849cb64e0ae85",
+                "sha256:bbaf4662e498c8c2e352da5f5bca5ab29d378895fa2d980630656178bd607c46",
+                "sha256:cfd13d47b29ed3bbaafaff7d8b21e90d827631afda134836962011acb5904b71",
+                "sha256:d4473c22cc296425bbbce7e9429588e76e05bc7342da359d6520b6427bf76660",
+                "sha256:d8fbb68711905f8912e5af474ca8b78d077447d8f3918997fecbf26943ff3cbb",
+                "sha256:e5012e5cc2ac628177eaac0e83d622b2dd499e28253d4107a08ecc59ede3fc2c",
+                "sha256:eb4f18589d196a4cbe5290b435d135dee96567e07c2b2d43b5c4621b6501531a"
             ],
             "index": "pypi",
-            "version": "==0.910"
+            "version": "==1.6.1"
         },
         "mypy-extensions": {
             "hashes": [
-                "sha256:090fedd75945a69ae91ce1303b5824f428daf5a028d2f6ab8a299250a846f15d",
-                "sha256:2d82818f5bb3e369420cb3c4060a7970edba416647068eb4c5343488a6c604a8"
+                "sha256:4392f6c0eb8a5668a69e23d168ffa70f0be9ccfd32b5cc2d26a34ae5b844552d",
+                "sha256:75dbf8955dc00442a438fc4d0666508a9a97b6bd41aa2f0ffe9d2f2725af0782"
             ],
-            "version": "==0.4.3"
-        },
-        "toml": {
-            "hashes": [
-                "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
-                "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
-            ],
-            "version": "==0.10.2"
+            "markers": "python_version >= '3.5'",
+            "version": "==1.0.0"
         },
         "types-pyyaml": {
             "hashes": [
-                "sha256:1d9e431e9f1f78a65ea957c558535a3b15ad67ea4912bce48a6c1b613dcf81ad",
-                "sha256:f1d1357168988e45fa20c65aecb3911462246a84809015dd889ebf8b1db74124"
+                "sha256:334373d392fde0fdf95af5c3f1661885fa10c52167b14593eb856289e1855062",
+                "sha256:c05bc6c158facb0676674b7f11fe3960db4f389718e19e62bd2b84d6205cfd24"
             ],
             "index": "pypi",
-            "version": "==5.4.10"
+            "version": "==6.0.12.12"
         },
         "typing-extensions": {
             "hashes": [
-                "sha256:49f75d16ff11f1cd258e1b988ccff82a3ca5570217d7ad8c5f48205dd99a677e",
-                "sha256:d8226d10bc02a29bcc81df19a26e56a9647f8b0a6d4a83924139f4a8b01f17b7",
-                "sha256:f1d25edafde516b146ecd0613dabcc61409817af4766fbbcfb8d1ad4ec441a34"
+                "sha256:8f92fc8806f9a6b641eaa5318da32b44d401efaac0f6678c9bc448ba3605faa0",
+                "sha256:df8e4339e9cb77357558cbdbceca33c303714cf861d1eef15e1070055ae8b7ef"
             ],
-            "version": "==3.10.0.2"
+            "markers": "python_version >= '3.8'",
+            "version": "==4.8.0"
         }
     }
 }

README.md

@@ -1,107 +0,0 @@
-Initial setup
-=============
-
-Run on client:
-
-    sudo git clone https://git.jim.sh/jim/borg-setup.git /opt/borg
-    sudo /opt/borg/initial-setup.sh
-
-Customize `/opt/borg/config.yaml` as desired.
-
-
-
-Cheat sheet
-===========
-
-*After setup, the copy of this file on the client will have the
-variables in this section filled in automatically*
-
-### Configuration
-
-    Hostname: ${HOSTNAME}
-    Base directory: ${BORG_DIR}
-    Destination: ${BACKUP_USER}@${BACKUP_HOST}
-    Repository: ${BACKUP_REPO}
-
-### Commands
-
-See when next backup is scheduled:
-
-    systemctl list-timers borg-backup.timer
-
-See status of most recent backup:
-
-    systemctl status --full --lines 999999 --no-pager --all borg-backup
-
-Watch log:
-
-    journalctl --all --follow --unit borg-backup
-
-Start backup now:
-
-    sudo systemctl start borg-backup
-
-Interrupt backup in progress:
-
-    sudo systemctl stop borg-backup
-
-Show backups and related info:
-
-    sudo ${BORG_DIR}/borg.sh info
-    sudo ${BORG_DIR}/borg.sh list
-
-Run Borg using the read-write SSH key:
-
-    sudo ${BORG_DIR}/borg.sh --rw list
-
-Mount and look at files:
-
-    mkdir mnt
-    sudo ${BORG_DIR}/borg.sh mount :: mnt
-    sudo -s # to explore as root
-    sudo umount mnt
-
-Prune old backups.  Only run if sure local system was never compromised,
-as object deletion could have been queued during append-only operations.
-Requires SSH key password from bitwarden.
-
-    sudo ${BORG_DIR}/prune.sh
-
-
-
-Design
-======
-
-- On server, we have a separate user account "jim-backups".  Password
-  for this account is in bitwarden in the "Backups" folder, under `ssh
-  backup.jim.sh`.
-
-- Repository keys are repokeys, which get stored on the server, inside
-  the repo.  Passphrases are stored:
-  - on clients (in `/opt/borg/passphrase`, for making backups)
-  - in bitwarden (under `borg <hostname>`, user `repo key`)
-
-- Each client has two SSH keys for connecting to the server:
-  - `/opt/borg/ssh/id_ecdsa_appendonly`
-    - configured on server for append-only operation
-    - used for making backups
-    - no password
-  - `/opt/borg/ssh/id_ecdsa`
-    - configured on server for read-write operation
-    - used for manual recovery, management, pruning
-    - password in bitwarden (under `borg [hostname]`, user `read-write ssh key`)
-
-- Pruning requires the password and is a manual operation, and should only
-  be run when the client has not been compromised.
-
-      sudo /opt/borg/prune.sh
-
-- Systemd timers start daily backups:
-
-      /etc/systemd/system/borg-backup.service -> /opt/borg/borg-backup.service
-      /etc/systemd/system/borg-backup.timer -> /opt/borg/borg-backup.timer
-
-- Backup script `/opt/borg/backup.py` uses configuration in
-  `/opt/borg/config.yaml` to generate our own list of files, excluding
-  anything that's too large by default.  This requires borg 1.2.0b1
-  or newer, which is why the setup scripts download a specific version.

backup.py

@@ -8,10 +8,14 @@
 import os
 import re
 import sys
+import json
 import stat
 import time
+import select
 import pathlib
+import threading
 import subprocess
+import _thread # for interrupt_main
 
 import typing
 
@@ -19,41 +23,31 @@ import yaml
 import wcmatch.glob # type: ignore
 import humanfriendly # type: ignore
 
-def pstr(path: bytes) -> str:
-    return path.decode(errors='backslashreplace')
+def b2s(raw: bytes) -> str:
+    return raw.decode(errors='backslashreplace')
+
+def format_size(n: int) -> str:
+    return humanfriendly.format_size(n, keep_width=True, binary=True)
+
+# Type corresponding to patterns that are generated by
+# wcmatch.translate: two lists of compiled REs (a,b).  A path matches
+# if it matches at least one regex in "a" and none in "b".
+MatchPatterns = typing.Tuple[typing.List[re.Pattern], typing.List[re.Pattern]]
 
 class Config:
-    roots: list[bytes]
-    max_file_size: typing.Optional[int]
+    roots: typing.List[bytes]
     one_file_system: bool
     exclude_caches: bool
-    exclude: list[bytes]
-    force_include: list[bytes]
+    exclude: MatchPatterns
+    unexclude: MatchPatterns
+    max_size_rules: typing.List[typing.Tuple[int, MatchPatterns]]
     notify_email: typing.Optional[str]
 
     def __init__(self, configfile: str):
-        # Read config
-        with open(configfile, 'r') as f:
-            config = yaml.safe_load(f)
-            self.one_file_system = config.get('one-file-system', False)
-            self.exclude_caches = config.get('exclude-caches', False)
 
-            if 'max-file-size' in config:
-                self.max_file_size = humanfriendly.parse_size(
-                    config['max-file-size'])
-            else:
-                self.max_file_size = None
-
-            raw = config.get('roots', '').encode().split(b'\n')
-            self.roots = []
-            for x in raw:
-                if not len(x):
-                    continue
-                self.roots.append(x)
-            self.roots.sort(key=len)
-
-            def process_match_list(config_name):
-                raw = config.get(config_name, '').encode().split(b'\n')
+        # Helper to process lists of patterns into regexes
+        def process_match_list(config_entry):
+                raw = config_entry.encode().split(b'\n')
                 pats = []
                 # Prepend '**/' to any relative patterns
                 for x in raw:
@@ -63,37 +57,49 @@ class Config:
                         pats.append(x)
                     else:
                         pats.append(b'**/' + x)
-                return pats
 
-            self.exclude = process_match_list('exclude')
-            self.force_include = process_match_list('force-include')
+                # Compile patterns.
+                (a, b) = wcmatch.glob.translate(
+                    pats, flags=(wcmatch.glob.GLOBSTAR |
+                                 wcmatch.glob.DOTGLOB |
+                                 wcmatch.glob.NODOTDIR |
+                                 wcmatch.glob.EXTGLOB |
+                                 wcmatch.glob.BRACE))
+                return ([ re.compile(x) for x in a ],
+                        [ re.compile(x) for x in b ])
+
+        # Read config
+        with open(configfile, 'r') as f:
+            config = yaml.safe_load(f)
+            self.one_file_system = config.get('one-file-system', False)
+            self.exclude_caches = config.get('exclude-caches', False)
+
+            raw = config.get('roots', '').encode().split(b'\n')
+            self.roots = []
+            for x in raw:
+                if not len(x):
+                    continue
+                self.roots.append(x)
+            self.roots.sort(key=len)
+
+            self.exclude = process_match_list(config.get('exclude', ''))
+            self.unexclude = process_match_list(config.get('unexclude', ''))
+
+            self.max_size_rules = []
+            rules = { humanfriendly.parse_size(k): v
+                      for k, v in config.get('max-size-rules', {}).items() }
+            for size in reversed(sorted(rules)):
+                self.max_size_rules.append(
+                    (size, process_match_list(rules[size])))
 
             self.notify_email = config.get('notify-email', None)
 
-        # Compile patterns
-        flags = (wcmatch.glob.GLOBSTAR |
-                 wcmatch.glob.DOTGLOB |
-                 wcmatch.glob.NODOTDIR |
-                 wcmatch.glob.EXTGLOB |
-                 wcmatch.glob.BRACE)
-
-        # Path matches if it matches at least one regex in "a" and no
-        # regex in "b"
-        (a, b) = wcmatch.glob.translate(self.exclude, flags=flags)
-        self.exclude_re = ([ re.compile(x) for x in a ],
-                           [ re.compile(x) for x in b ])
-
-        (a, b) = wcmatch.glob.translate(self.force_include, flags=flags)
-        self.force_include_re = ([ re.compile(x) for x in a ],
-                                 [ re.compile(x) for x in b ])
-
-    def match_re(self, re: tuple[list[typing.Pattern],
-                                 list[typing.Pattern]], path: bytes):
+    def match_re(self, r: MatchPatterns, path: bytes):
         # Path matches if it matches at least one regex in
-        # re[0] and no regex in re[1].
-        for a in re[0]:
+        # r[0] and no regex in r[1].
+        for a in r[0]:
             if a.match(path):
-                for b in re[1]:
+                for b in r[1]:
                     if b.match(path):
                         return False
                 return True
@@ -103,28 +109,33 @@ class Backup:
     def __init__(self, config: Config, dry_run: bool):
         self.config = config
         self.dry_run = dry_run
-        self.root_seen: dict[bytes, bool] = {}
+        self.root_seen: typing.Dict[bytes, bool] = {}
 
-        # All logged messages, with severity
-        self.logs: list[tuple[str, str]] = []
+        # Saved log messages (which includes borg output)
+        self.logs: typing.List[typing.Tuple[str, str]] = []
 
     def out(self, path: bytes):
         self.outfile.write(path + (b'\n' if self.dry_run else b'\0'))
 
-    def log(self, letter: str, msg: str):
-        colors = { 'E': 31, 'W': 33, 'I': 36 };
-        if letter in colors:
-            c = colors[letter]
-        else:
-            c = 0
-        sys.stderr.write(f"\033[1;{c}m{letter}:\033[22m {msg}\033[0m\n")
+    def log(self, letter: str, msg: str, bold: bool=False):
+        colors = {
+            'E': 31, # red: error
+            'W': 33, # yellow: warning
+            'N': 34, # blue: notice, a weaker warning (no email generated)
+            'I': 36, # cyan: info, backup.py script output
+            'O': 37, # white: regular output from borg
+        };
+        c = colors[letter] if letter in colors else 0
+        b = "" if bold else "\033[22m"
+        sys.stdout.write(f"\033[1;{c}m{letter}:{b} {msg}\033[0m\n")
+        sys.stdout.flush()
         self.logs.append((letter, msg))
 
     def run(self, outfile: typing.IO[bytes]):
         self.outfile = outfile
         for root in self.config.roots:
             if root in self.root_seen:
-                self.log('I', f"ignoring root, already seen: {pstr(root)}")
+                self.log('I', f"ignoring root, already seen: {b2s(root)}")
                 continue
 
             try:
@@ -132,13 +143,13 @@ class Backup:
                 if not stat.S_ISDIR(st.st_mode):
                     raise NotADirectoryError
             except FileNotFoundError:
-                self.log('W', f"ignoring root, does not exist: {pstr(root)}")
+                self.log('E', f"root does not exist: {b2s(root)}")
                 continue
             except NotADirectoryError:
-                self.log('W', f"ignoring root, not a directory: {pstr(root)}")
+                self.log('E', f"root is not a directory: {b2s(root)}")
                 continue
 
-            self.log('I', f"processing root {pstr(root)}")
+            self.log('I', f"processing root {b2s(root)}")
             self.scan(root)
 
     def scan(self, path: bytes, parent_st: os.stat_result=None):
@@ -159,7 +170,7 @@ class Backup:
             # See if there's a reason to exclude it
             exclude_reason = None
 
-            if self.config.match_re(self.config.exclude_re, decorated_path):
+            if self.config.match_re(self.config.exclude, decorated_path):
                 # Config file says to exclude
                 exclude_reason = ('I', f"skipping, excluded by config file")
 
@@ -171,23 +182,27 @@ class Backup:
                 exclude_reason = ('I', "skipping, on different filesystem")
 
             elif (is_reg
-                  and self.config.max_file_size
-                  and size > self.config.max_file_size):
-                # Too big
-                def format_size(n):
-                    return humanfriendly.format_size(
-                        n, keep_width=True, binary=True)
-                a = format_size(size)
-                b = format_size(self.config.max_file_size)
-                exclude_reason = ('W', f"file size {a} exceeds limit {b}")
+                  and len(self.config.max_size_rules)
+                  and size > self.config.max_size_rules[-1][0]):
+                # Check file sizes against our list.
+                # Only need to check if the size is bigger than the smallest
+                # entry on the list; then, we need to check it against all rules
+                # to see which one applies.
+                for (max_size, patterns) in self.config.max_size_rules:
+                    if self.config.match_re(patterns, decorated_path):
+                        if size > max_size:
+                            a = format_size(size)
+                            b = format_size(max_size)
+                            exclude_reason = (
+                                'W', f"file size {a} exceeds limit {b}")
+                        break
 
             # If we have a reason to exclude it, stop now unless it's
             # force-included
-            force = self.config.match_re(self.config.force_include_re,
-                                         decorated_path)
+            force = self.config.match_re(self.config.unexclude, decorated_path)
             if exclude_reason and not force:
                 self.log(exclude_reason[0],
-                         f"{exclude_reason[1]}: {pstr(path)}")
+                         f"{exclude_reason[1]}: {b2s(path)}")
                 return
 
             # Print path for Borg
@@ -209,7 +224,7 @@ class Backup:
                         with open(path + b'/CACHEDIR.TAG', 'rb') as f:
                             if f.read(len(tag)) == tag:
                                 self.log(
-                                    'I', f"skipping, cache dir: {pstr(path)}")
+                                    'I', f"skipping, cache dir: {b2s(path)}")
                                 return
                     except:
                         pass
@@ -219,16 +234,136 @@ class Backup:
                     for entry in it:
                         self.scan(path=entry.path, parent_st=st)
 
-        except PermissionError as e:
-            self.log('E', f"can't read {pstr(path)}")
+        except (FileNotFoundError,
+                IsADirectoryError,
+                NotADirectoryError,
+                PermissionError) as e:
+            self.log('E', f"can't read {b2s(path)}: {str(e)}")
             return
 
-def main(argv: list[str]):
+    def run_borg(self, argv: typing.List[str],
+                 stdin_writer: typing.Callable[[typing.IO[bytes]],
+                                               typing.Any]=None):
+        """Run a borg command, capturing and displaying output, while feeding
+        input using stdin_writer.  Returns True on Borg success, False on error.
+        """
+        borg = subprocess.Popen(argv,
+                                stdin=subprocess.PIPE,
+                                stdout=subprocess.PIPE,
+                                stderr=subprocess.STDOUT)
+        if borg.stdin is None:
+            raise Exception("no pipe")
+
+        # Count warnings and errors from Borg, so we can interpret its
+        # error codes correctly (e.g. ignoring exit codes if warnings
+        # were all harmless).
+        borg_saw_warnings = 0
+        borg_saw_errors = 0
+
+        # Use a thread to capture output
+        def reader_thread(fh):
+            nonlocal borg_saw_warnings
+            nonlocal borg_saw_errors
+            last_progress = 0
+            for line in fh:
+                try:
+                    data = json.loads(line)
+
+                    if data['type'] == 'log_message':
+                        changed_msg = "file changed while we backed it up"
+                        if data['levelname'] == 'WARNING':
+                            if changed_msg in data['message']:
+                                # harmless; don't count as a Borg warning
+                                outlevel = 'N'
+                            else:
+                                borg_saw_warnings += 1
+                                outlevel = 'W'
+                            output = "warning: "
+                        elif data['levelname'] not in ('DEBUG', 'INFO'):
+                            borg_saw_errors += 1
+                            outlevel = 'E'
+                            output = "error: "
+                        else:
+                            outlevel = 'O'
+                            output = ""
+                        output += data['message']
+
+                    elif (data['type'] == 'progress_message'
+                          and 'message' in data):
+                        outlevel = 'O'
+                        output = data['message']
+
+                    elif data['type'] == 'archive_progress':
+                        now = time.time()
+                        if now - last_progress > 10:
+                            last_progress = now
+                            def size(short: str, full: str) -> str:
+                                return f" {short}={format_size(data[full])}"
+                            outlevel = 'O'
+                            output = (f"progress:" +
+                                      f" files={data['nfiles']}" +
+                                      size('orig', 'original_size') +
+                                      size('comp', 'compressed_size') +
+                                      size('dedup', 'deduplicated_size'))
+                        else:
+                            continue
+                    else:
+                        # ignore unknown progress line
+                        continue
+                except Exception as e:
+                    # on error, print raw line with exception
+                    outlevel = 'E'
+                    output = f"[exception: {str(e)}] " + b2s(line).rstrip()
+                self.log(outlevel, output)
+            fh.close()
+        def _reader_thread(fh):
+            try:
+                return reader_thread(fh)
+            except BrokenPipeError:
+                pass
+            except Exception:
+                _thread.interrupt_main()
+        reader = threading.Thread(target=_reader_thread, args=(borg.stdout,))
+        reader.daemon = True
+        reader.start()
+
+        try:
+            if stdin_writer:
+                # Give borg some time to start, just to clean up stdout
+                time.sleep(1)
+                stdin_writer(borg.stdin)
+        except BrokenPipeError:
+            self.log('E', "<broken pipe>")
+        finally:
+            try:
+                borg.stdin.close()
+            except BrokenPipeError:
+                pass
+            borg.wait()
+        reader.join()
+        ret = borg.returncode
+        if ret < 0:
+            self.log('E', f"borg exited with signal {-ret}")
+        elif ret == 2 or borg_saw_errors:
+            self.log('E', f"borg exited with errors (ret={ret})")
+        elif ret == 1:
+            if borg_saw_warnings:
+                self.log('W', f"borg exited with warnings (ret={ret})")
+            else:
+                return True
+        elif ret != 0:
+            self.log('E', f"borg exited with unknown error code {ret}")
+        else:
+            return True
+        return False
+
+def main(argv: typing.List[str]):
     import argparse
 
     def humansize(string):
         return humanfriendly.parse_size(string)
 
+    # Parse args
     parser = argparse.ArgumentParser(
         prog=argv[0],
         description="Back up the local system using borg",
@@ -237,8 +372,8 @@ def main(argv: list[str]):
     base = pathlib.Path(__file__).parent
     parser.add_argument('-c', '--config',
                         help="Config file", default=str(base / "config.yaml"))
-    parser.add_argument('-b', '--borg',
-                        help="Borg command", default=str(base / "borg.sh"))
+    parser.add_argument('-v', '--vars',
+                        help="Variables file", default=str(base / "vars.sh"))
     parser.add_argument('-n', '--dry-run', action="store_true",
                         help="Just print log output, don't run borg")
     parser.add_argument('-d', '--debug', action="store_true",
@@ -246,49 +381,131 @@ def main(argv: list[str]):
 
     args = parser.parse_args()
     config = Config(args.config)
-
     backup = Backup(config, args.dry_run)
+
+    # Parse variables from vars.sh
+    hostname = os.uname().nodename
+    borg_sh = str(base / "borg.sh")
+    notify_sh = str(base / "notify.sh")
+    try:
+        with open(args.vars) as f:
+            for line in f:
+                m = re.match(r"\s*export\s*([A-Z_]+)=(.*)", line)
+                if not m:
+                    continue
+                var = m.group(1)
+                value = m.group(2)
+                if var == "HOSTNAME":
+                    hostname = value
+                if var == "BORG":
+                    borg_sh = value
+                if var == "BORG_DIR":
+                    notify_sh = str(pathlib.Path(value) / "notify.sh")
+    except Exception as e:
+        backup.log('W', f"failed to parse variables from {args.vars}: {str(e)}")
+
+    # Run backup
     if args.dry_run:
         if args.debug:
             backup.run(sys.stdout.buffer)
         else:
             with open(os.devnull, "wb") as out:
                 backup.run(out)
+        sys.stdout.flush()
     else:
-        borg = subprocess.Popen([args.borg,
-                                 "create",
-                                 "--verbose",
-                                 "--list",
-                                 "--filter", "E",
-                                 "--stats",
-                                 "--checkpoint-interval", "900",
-                                 "--compression", "zstd,3",
-                                 "--paths-from-stdin",
-                                 "--paths-delimiter", "\\0",
-                                 "::'{hostname}-{now:%Y%m%d-%H%M%S}'"],
-                                stdin=subprocess.PIPE)
-        if borg.stdin is None:
-            raise Exception("no pipe")
-        try:
-            # Give borg some time to start, just to clean up stdout
-            time.sleep(2)
-            backup.run(borg.stdin)
-        except BrokenPipeError:
-            sys.stderr.write(f"broken pipe\n")
-        finally:
-            try:
-                borg.stdin.close()
-            except BrokenPipeError:
-                pass
-            borg.wait()
-        ret = borg.returncode
-        if ret < 0:
-            sys.stderr.write(f"error: process exited with signal {-ret}\n")
-            return 1
-        elif ret != 0:
-            sys.stderr.write(f"error: process exited with return code {ret}\n")
-            return ret
+        if backup.run_borg([borg_sh,
+                            "create",
+                            "--verbose",
+                            "--progress",
+                            "--log-json",
+                            "--list",
+                            "--filter", "E",
+                            "--stats",
+                            "--checkpoint-interval", "900",
+                            "--compression", "zstd,3",
+                            "--paths-from-stdin",
+                            "--paths-delimiter", "\\0",
+                            "::" + hostname + "-{now:%Y%m%d-%H%M%S}"],
+                           stdin_writer=backup.run):
 
+            # backup success; run prune.  Note that this won't actually free
+            # space until a "./borg.sh --rw compact", because we're in
+            # append-only mode.
+            backup.log('I', f"pruning archives", bold=True)
+            backup.run_borg([borg_sh,
+                             "prune",
+                             "--verbose",
+                             "--list",
+                             "--progress",
+                             "--log-json",
+                             "--stats",
+                             "--keep-within=7d",
+                             "--keep-daily=14",
+                             "--keep-weekly=8",
+                             "--keep-monthly=-1",
+                             "--glob-archives", hostname + "-????????-??????"])
+
+    # See if we had any errors
+    warnings = sum(1 for (letter, msg) in backup.logs if letter == 'W')
+    errors = sum(1 for (letter, msg) in backup.logs if letter == 'E')
+
+    def plural(num: int, word: str) -> str:
+        suffix = "" if num == 1 else "s"
+        return f"{num} {word}{suffix}"
+
+    warnmsg = plural(warnings, "warning") if warnings else None
+    errmsg = plural(errors, "error") if errors else None
+
+    if not warnings and not errors:
+        backup.log('I', f"backup successful", bold=True)
+
+    else:
+        if warnmsg:
+            backup.log('W', f"reported {warnmsg}", bold=True)
+        if errors:
+            backup.log('E', f"reported {errmsg}", bold=True)
+
+        # Send a notification of errors
+        email = backup.config.notify_email
+        if email and not args.dry_run:
+            backup.log('I', f"sending error notification to {email}")
+
+            def write_logs(title, only_include=None):
+                body = [ title ]
+                for (letter, msg) in backup.logs:
+                    if only_include and letter not in only_include:
+                        continue
+                    # Use a ":" prefix for warnings/errors/notices so that
+                    # the mail reader highlights them.
+                    if letter in "EWN":
+                        prefix = ":"
+                    else:
+                        prefix = " "
+                    body.append(f"{prefix}{letter}: {msg}")
+                return "\n".join(body).encode()
+
+
+            body_text = write_logs("Logged errors and warnings:", "EWN")
+            body_text += b"\n\n"
+            body_text += write_logs("All log messages:")
+
+            # Subject summary
+            if errmsg and warnmsg:
+                summary = f"{errmsg}, {warnmsg}"
+            elif errors:
+                summary = errmsg or ""
+            else:
+                summary = warnmsg or ""
+
+            # Call notify.sh
+            res = subprocess.run([notify_sh, summary, email], input=body_text)
+            if res.returncode != 0:
+                backup.log('E', f"failed to send notification")
+                errors += 1
+
+    # Exit with an error code if we had any errors
+    if errors:
+        return 1
     return 0
 
 if __name__ == "__main__":

borg.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+set -e
+. "$(dirname "$0")"/vars.sh
+
+export BORG_PASSCOMMAND="cat ${BORG_DIR}/passphrase"
+export BORG_BASE_DIR=${BORG_DIR}
+export BORG_CACHE_DIR=${BORG_DIR}/cache
+export BORG_CONFIG_DIR=${BORG_DIR}/config
+export BORG_RSH="ssh -F $SSH/config -i $SSH/id_ecdsa_appendonly"
+
+exec "${BORG_BIN}" "$@"

config.yaml

@@ -4,19 +4,12 @@
 roots: |
   /
   /boot
-  /efi
   /usr
   /var
 
 one-file-system: true
 exclude-caches: true
 
-# Files larger than this are excluded.  If a large file isn't
-# explicitly mentioned in "excludes" below, it also generates a
-# warning.  Note that this counts used blocks, so files with large
-# holes will still be considered small (since they'll compress easily)
-max-file-size: 500MiB
-
 # Files/dirs to exclude from backup.
 # Relative paths are treated as if starting with **/
 # Paths ending in / will only match directories.
@@ -28,10 +21,21 @@ exclude: |
   Steam/ubuntu*/
   .cache/
 
+# Rules to exclude files based on file size.
+# This is a dict of sizes, each with a list of rules.
+# For a given path, the largest size with a matching rule applies.
+# Matching follows the same behavior as the "exclude" list.
+# Size is calculated as used blocks (think "du", not "du --apparent-size").
+max-size-rules:
+  500 MiB: |
+    *
+#  1.0 GiB: |
+#    *.mp4
+
 # Files that are always included, even if they would have been
 # excluded due to file size or the "exclude" list.
-# Matching rules are the same as above.
-force-include: |
+# Matching follows the same behavior as the "exclude" list.
+unexclude: |
   .git/objects/pack/*.pack
 
 # Email address for notification at end of backup

initial-setup.sh

@@ -1,24 +1,40 @@
 #!/bin/bash
 
 # These can be overridden when running this script
-BACKUP_HOST=${BACKUP_HOST:-backup.jim.sh}
-BACKUP_USER=${BACKUP_USER:-jim-backups}
-BACKUP_REPO=${BACKUP_REPO:-borg/$(hostname)}
+set_default_variables()
+{
+    HOSTNAME=${HOSTNAME:-$(hostname)}
+    BACKUP_HOST=${BACKUP_HOST:-backup.jim.sh}
+    BACKUP_PORT=${BACKUP_PORT:-222}
+    BACKUP_USER=${BACKUP_USER:-jim-backups}
+    BACKUP_REPO=${BACKUP_REPO:-borg/${HOSTNAME}}
+    SYSTEMD_UNIT=${SYSTEMD_UNIT:-borg-backup}
 
-# Borg binary and hash
-BORG_URL="https://github.com/borgbackup/borg/releases/download/1.2.0b3/borg-linux64"
-BORG_SHA256=8dd6c2769d9bf3ca7a65ebf6781302029fc3b15105aff63d33195c007f897360
+    # Use stable host ID in case MAC address changes.
+    # Note that this host ID is only used to manage locks, so it's
+    # not crucial that it remains stable.
+    UUID=$(python3 -c 'import uuid;print(uuid.getnode())')
+    HOSTID=${BORG_HOST_ID:-"${HOSTNAME}@${UUID}"}
+
+    log "Configuration:"
+    log " HOSTNAME           Local hostname: \033[1m${HOSTNAME}"
+    log " HOSTID              Local host ID: \033[1m${HOSTID}"
+    log " BACKUP_USER    Backup server user: \033[1m${BACKUP_USER}"
+    log " BACKUP_HOST    Backup server host: \033[1m${BACKUP_HOST}"
+    log " BACKUP_PORT    Backup server port: \033[1m${BACKUP_PORT}"
+    log " BACKUP_REPO     Server repository: \033[1m${BACKUP_REPO}"
+    log " SYSTEMD_UNIT    Systemd unit name: \033[1m${SYSTEMD_UNIT}"
+    for i in $(seq 15 -1 1); do
+        printf "\rPress ENTER or wait $i seconds to continue... \b"
+        if read -t 1 ; then break; fi
+    done
+}
 
 # Main dir is where this repo was checked out
 BORG_DIR="$(realpath "$(dirname "$0")")"
 cd "${BORG_DIR}"
 
-# This is named with uppercase so that it doesn't tab-complete for
-# "./b<tab>", which should give us "./borg.sh"
-BORG_BIN="${BORG_DIR}/Borg.bin"
-
-# Use stable host ID in case MAC address changes
-HOSTID="$(hostname -f)@$(python -c 'import uuid;print(uuid.getnode())')"
+BORG_BIN="${BORG_DIR}/bin/borg.$(uname -m)"
 
 function error_handler() {
     echo "Error at $1 line $2:"
@@ -30,11 +46,100 @@ trap 'error_handler ${BASH_SOURCE} ${LINENO} $?' ERR
 set -o errexit
 set -o errtrace
 
-if [ -e ".setup-complete" ]; then
-    echo "Error: BORG_DIR $BORG_DIR was already set up; giving up."
-    echo "Use \"git clean\" to return it to original state if desired"
-    exit 1
-fi
+# Create pip environment
+setup_venv()
+{
+    if ! which pipenv >/dev/null 2>&1 ; then
+        error "pipenv not found, try: sudo apt install pipenv"
+    fi
+    mkdir -p .venv
+    pipenv install
+}
+
+# Create shell script with environment variables
+create_borg_vars()
+{
+    VARS=${BORG_DIR}/vars.sh
+
+    # These variables are used elsewhere in this script
+    BORG_REPO="ssh://${BACKUP_USER}@${BACKUP_HOST}:${BACKUP_PORT}/./${BACKUP_REPO}"
+    BORG=${BORG_DIR}/borg.sh
+    SSH=$BORG_DIR/ssh
+
+    cat >"$VARS" <<EOF
+export BACKUP_USER=${BACKUP_USER}
+export BACKUP_HOST=${BACKUP_HOST}
+export BACKUP_PORT=${BACKUP_PORT}
+export BACKUP_REPO=${BACKUP_REPO}
+export HOSTNAME=${HOSTNAME}
+export BORG_REPO=${BORG_REPO}
+export BORG_HOST_ID=${HOSTID}
+export BORG_PASSCOMMAND="cat ${BORG_DIR}/passphrase"
+export BORG_DIR=${BORG_DIR}
+export SSH=${SSH}
+export BORG=${BORG}
+export BORG_BIN=${BORG_BIN}
+export SYSTEMD_UNIT=${SYSTEMD_UNIT}
+EOF
+    if ! "$BORG" -h >/dev/null ; then
+        error "Can't run the borg wrapper; does borg work?"
+    fi
+}
+
+# Copy templated files, filling in templates as needed
+install_templated_files()
+{
+    DOCS="README.md"
+    SCRIPTS="notify.sh logs.sh"
+    for i in ${DOCS} ${SCRIPTS}; do
+        sed -e "s!\${HOSTNAME}!${HOSTNAME}!g" \
+            -e "s!\${BORG_DIR}!${BORG_DIR}!g" \
+            -e "s!\${BORG_BIN}!${BORG_BIN}!g" \
+            -e "s!\${BACKUP_USER}!${BACKUP_USER}!g" \
+            -e "s!\${BACKUP_HOST}!${BACKUP_HOST}!g" \
+            -e "s!\${BACKUP_PORT}!${BACKUP_PORT}!g" \
+            -e "s!\${BACKUP_REPO}!${BACKUP_REPO}!g" \
+            -e "s!\${SYSTEMD_UNIT}!${SYSTEMD_UNIT}!g" \
+            templates/$i > $i
+    done
+    chmod +x ${SCRIPTS}
+}
+
+# Update local paths in scripts
+update_paths()
+{
+    sed -i\
+        -e "1c#!${BORG_DIR}/.venv/bin/python" \
+        backup.py
+}
+
+# See if we're just supposed to update an existing install, or recovering
+parse_args()
+{
+    RECOVER=0
+    UPDATE=0
+    if [ "$1" == "--recover" ] ; then
+        if [ -e "vars.sh" ]; then
+            error "It looks like this borg was already set up, can only recover from fresh start"
+        fi
+        RECOVER=1
+
+    elif [ "$1" == "--update-paths" ] || [ "$1" == "--update" ] ; then
+        if [ ! -e "vars.sh" ]; then
+            error "Can't update, not set up yet"
+        fi
+        UPDATE=1
+
+    elif [ -n "$1" ] ; then
+        error "Unknown arg $1"
+
+    elif [ -e "vars.sh" ]; then
+        warn "Error: BORG_DIR $BORG_DIR already looks set up."
+        warn "Use \"git clean\" to return it to original state if desired".
+        warn "Or specify --update to refresh things from latest git."
+        error "Giving up"
+    fi
+}
 
 # Make a temp dir to work in
 TMP=$(mktemp -d)
@@ -69,57 +174,6 @@ notice() { msg 32 "$@" ; }
 warn() { msg 31 "$@" ; }
 error() { msg 31 "Error:" "$@" ; exit 1 ; }
 
-# Create pip environment
-setup_venv()
-{
-    mkdir .venv
-    pipenv install
-}
-
-# Install borg
-install_borg()
-{
-    curl -L --progress-bar -o "${BORG_BIN}" "${BORG_URL}"
-    if ! echo "${BORG_SHA256} ${BORG_BIN}" | sha256sum -c ; then
-        error "hash error"
-    fi
-    chmod +x "${BORG_BIN}"
-}
-
-# Create wrapper to execute borg
-create_borg_wrapper()
-{
-    BORG=${BORG_DIR}/borg.sh
-    BORG_REPO="ssh://${BACKUP_USER}@${BACKUP_HOST}/./${BACKUP_REPO}"
-    SSH=$BORG_DIR/ssh
-
-    cat >"$BORG" <<EOF
-#!/bin/sh
-
-export BORG_REPO=${BORG_REPO}
-export BORG_PASSCOMMAND="cat ${BORG_DIR}/passphrase"
-export BORG_HOST_ID=${HOSTID}
-export BORG_BASE_DIR=${BORG_DIR}
-export BORG_CACHE_DIR=${BORG_DIR}/cache
-export BORG_CONFIG_DIR=${BORG_DIR}/config
-if [ "\$1" = "--rw" ] ; then
-    echo "=== Need SSH key passphrase.  Check Bitwarden for:"
-    echo "===   borg $(hostname) / read-write SSH key"
-    export BORG_RSH="ssh -F $SSH/config -o BatchMode=no -i $SSH/id_ecdsa"
-    shift
-else
-    export BORG_RSH="ssh -F $SSH/config -i $SSH/id_ecdsa_appendonly"
-fi
-
-exec "${BORG_BIN}" "\$@"
-EOF
-    chmod +x "$BORG"
-    if ! "$BORG" -h >/dev/null ; then
-        error "Can't run the new borg wrapper; does borg work?"
-    fi
-
-}
-
 print_random_key()
 {
     dd if=/dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 16
@@ -127,8 +181,18 @@ print_random_key()
 
 generate_keys()
 {
-    PASS_SSH=$(print_random_key)
-    PASS_REPOKEY=$(print_random_key)
+    if [ $RECOVER -eq 1 ] ; then
+        notice "Recovering configuration in order to use an existing backup"
+        read -s -p "Repo key for \"borg ${HOSTNAME}\": " PASS_REPOKEY
+        echo
+        read -s -p "Again: " PASS_REPOKEY2
+        echo
+        if [ -z "$PASS_REPOKEY" ] || [ $PASS_REPOKEY != $PASS_REPOKEY2 ] ; then
+            error "Bad repo key"
+        fi
+    else
+        PASS_REPOKEY=$(print_random_key)
+    fi
     echo "$PASS_REPOKEY" > passphrase
     chmod 600 passphrase
 }
@@ -148,8 +212,8 @@ configure_ssh()
     log "Creating SSH keys"
     ssh-keygen -N "" -t ecdsa \
                -C "backup-appendonly@$HOSTID" -f "$SSH/id_ecdsa_appendonly"
-    ssh-keygen -N "$PASS_SSH" -t ecdsa \
-               -C "backup@$HOSTID" -f "$SSH/id_ecdsa"
+    ssh-keygen -N "" -t ecdsa \
+               -C "backup-notify@$HOSTID" -f "$SSH/id_ecdsa_notify"
 
     # Create config snippets
     log "Creating SSH config and wrapper script"
@@ -167,25 +231,29 @@ EOF
 
     # Connect to backup host, using persistent control socket
     log "Connecting to server"
-    log "Please enter password; look in Bitwarden for: ${BACKUP_USER}@${BACKUP_HOST}"
+    log "Please enter password; look in Bitwarden for: ssh ${BACKUP_HOST} / ${BACKUP_USER}"
     ssh -F "$SSH/config" -o BatchMode=no -o PubkeyAuthentication=no \
         -o ControlMaster=yes -o ControlPath="$TMP/ssh-control" \
         -o StrictHostKeyChecking=accept-new \
+        -p "${BACKUP_PORT}" \
         -f "${BACKUP_USER}@${BACKUP_HOST}" sleep 600
     if ! run_ssh_command true >/dev/null 2>&1 </dev/null ; then
         error "SSH failed"
     fi
-    log "Connected to ${BACKUP_USER}@${BACKUP_HOST}"
+    log "Connected to ${BACKUP_USER}@${BACKUP_HOST}:${BACKUP_PORT}"
 
-    # Since we now have an SSH connection, check that the repo doesn't exist
-    if run_ssh_command "test -e $BACKUP_REPO" ; then
+    # Since we now have an SSH connection, check repo existence
+    if [ $RECOVER -eq 0 ] && run_ssh_command "test -e $BACKUP_REPO"; then
         error "$BACKUP_REPO already exists on the server, bailing out"
+    elif [ $RECOVER -ne 0 ] && ! run_ssh_command "test -e $BACKUP_REPO"; then
+        error "$BACKUP_REPO does NOT exist on the server, can't recover backup config"
     fi
 
     # Copy SSH keys to the server's authorized_keys file, removing any
     # existing keys with this HOSTID.
     log "Setting up SSH keys on remote host"
-    cmd="borg/borg serve --restrict-to-repository ~/$BACKUP_REPO"
+    REMOTE_BORG="borg/borg"
+    cmd="$REMOTE_BORG serve --restrict-to-repository ~/$BACKUP_REPO"
 
     keys=".ssh/authorized_keys"
     backup="${keys}.old-$(date +%Y%m%d-%H%M%S)"
@@ -194,14 +262,14 @@ EOF
     run_ssh_command "if cmp -s $backup $keys; then rm $backup ; fi"
     run_ssh_command "cat >> .ssh/authorized_keys" <<EOF
 command="$cmd --append-only",restrict $(cat "$SSH/id_ecdsa_appendonly.pub")
-command="borg/notify.sh",restrict $(cat "$SSH/id_ecdsa_appendonly.pub")
-command="$cmd",restrict $(cat "$SSH/id_ecdsa.pub")
+command="borg/notify.sh",restrict $(cat "$SSH/id_ecdsa_notify.pub")
 EOF
 
     # Test that everything worked
     log "Testing SSH login with new key"
     if ! ssh -F "$SSH/config" -i "$SSH/id_ecdsa_appendonly" -T \
-         "${BACKUP_USER}@${BACKUP_HOST}" borg --version </dev/null ; then
+         -p "${BACKUP_PORT}" "${BACKUP_USER}@${BACKUP_HOST}" "$REMOTE_BORG" \
+         --version </dev/null ; then
         error "Logging in with a key failed -- is server set up correctly?"
     fi
     log "Remote connection OK!"
@@ -230,21 +298,27 @@ EOF
 
 configure_systemd()
 {
-    TIMER=borg-backup.timer
-    SERVICE=borg-backup.service
+    TIMER=${SYSTEMD_UNIT}.timer
+    SERVICE=${SYSTEMD_UNIT}.service
     TIMER_UNIT=${BORG_DIR}/${TIMER}
     SERVICE_UNIT=${BORG_DIR}/${SERVICE}
 
     log "Creating systemd files"
 
+    # Choose a time between 1am and 6am based on this hostname
+    HASH=$(echo hash of "$HOSTNAME" | sha1sum)
+    HOUR=$((0x${HASH:0:8} % 5 + 1))
+    MINUTE=$((0x${HASH:8:8} % 6 * 10))
+    TIME=$(printf %02d:%02d:00 $HOUR $MINUTE)
+
+    log "Backup time is $TIME"
+
     cat > "$TIMER_UNIT" <<EOF
 [Unit]
 Description=Borg backup to ${BACKUP_HOST}
 
 [Timer]
-OnCalendar=*-*-* 01:00:00
-RandomizedDelaySec=1800
-FixedRandomDelay=true
+OnCalendar=*-*-* $TIME
 Persistent=true
 
 [Install]
@@ -261,90 +335,117 @@ ExecStart=${BORG_DIR}/backup.py
 Nice=10
 IOSchedulingClass=best-effort
 IOSchedulingPriority=6
+Restart=on-failure
+RestartSec=600
 EOF
 
-    log "Setting up systemd"
-    if (
-        ln -sfv "${TIMER_UNIT}" /etc/systemd/system &&
-        ln -sfv "${SERVICE_UNIT}" /etc/systemd/system &&
-        systemctl --no-ask-password daemon-reload &&
-        systemctl --no-ask-password enable ${TIMER} &&
-        systemctl --no-ask-password start ${TIMER}
-    ); then
-        log "Backup timer installed:"
-        systemctl list-timers ${TIMER}
-    else
-        warn ""
-        warn "Systemd setup failed"
-        warn "Do something like this to configure automatic backups:"
-        echo "     sudo ln -sfv \"${TIMER_UNIT}\" /etc/systemd/system &&"
-        echo "     sudo ln -sfv \"${SERVICE_UNIT}\" /etc/systemd/system &&"
-        echo "     sudo systemctl daemon-reload &&"
-        echo "     sudo systemctl enable ${TIMER} &&"
+    if [ $RECOVER -eq 1 ] ; then
+        log "Partially setting up systemd"
+        ln -sfv "${TIMER_UNIT}" /etc/systemd/system
+        ln -sfv "${SERVICE_UNIT}" /etc/systemd/system
+        systemctl --no-ask-password daemon-reload
+        systemctl --no-ask-password stop ${TIMER}
+        systemctl --no-ask-password disable ${TIMER}
+	warn "Since we're recovering, systemd automatic backups aren't enabled"
+	warn "Do something like this to configure automatic backups:"
+	echo "     sudo systemctl enable ${TIMER} &&"
         echo "     sudo systemctl start ${TIMER}"
         warn ""
+    else
+        log "Setting up systemd"
+        if (
+            ln -sfv "${TIMER_UNIT}" /etc/systemd/system &&
+            ln -sfv "${SERVICE_UNIT}" /etc/systemd/system &&
+            systemctl --no-ask-password daemon-reload &&
+            systemctl --no-ask-password enable ${TIMER} &&
+            systemctl --no-ask-password start ${TIMER}
+        ); then
+            log "Backup timer installed:"
+            systemctl list-timers --no-pager ${TIMER}
+        else
+            warn ""
+            warn "Systemd setup failed"
+            warn "Do something like this to configure automatic backups:"
+            echo "     sudo ln -sfv \"${TIMER_UNIT}\" /etc/systemd/system &&"
+            echo "     sudo ln -sfv \"${SERVICE_UNIT}\" /etc/systemd/system &&"
+            echo "     sudo systemctl daemon-reload &&"
+            echo "     sudo systemctl enable ${TIMER} &&"
+            echo "     sudo systemctl start ${TIMER}"
+            warn ""
+        fi
     fi
 }
 
-update_paths()
-{
-    sed -i \
-        -e "s!\${HOSTNAME}!$(hostname)!g" \
-        -e "s!\${BORG_DIR}!${BORG_DIR}!g" \
-        -e "s!\${BACKUP_USER}!${BACKUP_USER}!g" \
-        -e "s!\${BACKUP_HOST}!${BACKUP_HOST}!g" \
-        -e "s!\${BACKUP_REPO}!${BACKUP_REPO}!g" \
-        README.md
-
-    sed -i\
-        -e "1c#!${BORG_DIR}/.venv/bin/python" \
-        backup.py
-}
-
 git_setup()
 {
-    if ! git checkout -b "setup-$(hostname)" ; then
+    log "Committing local changes to git"
+
+    if ! git checkout -b "setup-${HOSTNAME}" ||
+       ! git add ${SYSTEMD_UNIT}.service ${SYSTEMD_UNIT}.timer vars.sh ||
+       ! git commit -a -m "autocommit after initial setup on ${HOSTNAME}" ; then
         warn "Git setup failed; ignoring"
         return
     fi
-
-    log "Committing local changes to git"
-    git add README.md borg-backup.service borg-backup.timer borg.sh
-    git commit -a -m "autocommit after initial setup on $(hostname)"
 }
 
-log "Configuration:"
-log "  Backup server host: ${BACKUP_HOST}"
-log "  Backup server user: ${BACKUP_USER}"
-log "     Repository path: ${BACKUP_REPO}"
+main() {
+    if [ $UPDATE -eq 1 ] ; then
+        notice "Non-destructively updating paths, variables, and venv..."
+        source vars.sh
+        set_default_variables
+        install_templated_files
+        update_paths
+        setup_venv
+        create_borg_vars
 
-setup_venv
-install_borg
-create_borg_wrapper
-generate_keys
-configure_ssh
-create_repo
-export_keys
-configure_systemd
-update_paths
-git_setup
+        notice "Testing SSH"
+        ssh -F "$SSH/config" -i "$SSH/id_ecdsa_appendonly" \
+	     -o BatchMode=no -o StrictHostKeyChecking=ask \
+             -p "${BACKUP_PORT}" "${BACKUP_USER}@${BACKUP_HOST}" info >/dev/null
 
-echo
-notice "Add these two passwords to Bitwarden:"
-notice ""
-notice "      Name: borg $(hostname)"
-notice "  Username: read-write ssh key"
-notice "  Password: $PASS_SSH"
-notice ""
-notice "      Name: borg $(hostname)"
-notice "  Username: repo key"
-notice "  Password: $PASS_REPOKEY"
-notice ""
-notice "Test the backup file list with"
-notice "    sudo ${BORG_DIR}/backup.py --dry-run"
-notice "and make any necessary adjustments to:"
-notice "    ${BORG_DIR}/config.yaml"
+        notice "Testing borg: if host location changed, say 'y' here"
+        ${BORG_DIR}/borg.sh info
 
-echo
+        notice "Done -- check 'git diff' and verify changes."
+        exit 0
+    fi
 
-echo "All done"
+    set_default_variables
+    setup_venv
+    create_borg_vars
+    generate_keys
+    configure_ssh
+    [ $RECOVER -eq 0 ] && create_repo
+    export_keys
+    configure_systemd
+    install_templated_files
+    update_paths
+    git_setup
+
+    echo
+    if [ $RECOVER -eq 1 ] ; then
+        notice "You should be set up with borg pointing to the existing repo now."
+        notice "Use commands like these to look at the backup:"
+        notice "    sudo ${BORG_DIR}/borg.sh info"
+        notice "    sudo ${BORG_DIR}/borg.sh list"
+        notice "You'll want to now restore files like ${BORG_DIR}/config.yaml before enabling systemd timers"
+    else
+        notice "Add this password to Bitwarden:"
+        notice ""
+        notice "      Name: borg ${HOSTNAME}"
+        notice "  Username: repo key"
+        notice "  Password: $PASS_REPOKEY"
+        notice ""
+        notice "Test the backup file list with"
+        notice "    sudo ${BORG_DIR}/backup.py --dry-run"
+        notice "and make any necessary adjustments to:"
+        notice "    ${BORG_DIR}/config.yaml"
+    fi
+
+    echo
+
+    echo "All done"
+}
+
+parse_args "$@"
+main

prune.sh

@@ -1,12 +0,0 @@
-#!/bin/bash
-
-BORG="$(dirname "$0")/borg.sh --rw"
-set -e
-
-$BORG prune \
-        --verbose \
-        --stats \
-        --keep-within=7d \
-        --keep-daily=14 \
-        --keep-weekly=8 \
-        --keep-monthly=-1

templates/README.md

@@ -0,0 +1,145 @@
+Initial setup
+=============
+
+Run on client:
+
+    sudo git clone https://git.jim.sh/jim/borg-setup.git /opt/borg
+    sudo /opt/borg/initial-setup.sh
+
+Customize `/opt/borg/config.yaml` as desired.
+
+
+Cheat sheet
+===========
+
+*After setup, /opt/borg/README.md will have the variables in this
+section filled in automatically*
+
+## Configuration
+
+    Hostname: ${HOSTNAME}
+    Base directory: ${BORG_DIR}
+    Destination: ${BACKUP_USER}@${BACKUP_HOST}:${BACKUP_PORT}
+    Repository: ${BACKUP_REPO}
+
+## Commands
+
+See when next backup is scheduled:
+
+    systemctl list-timers ${SYSTEMD_UNIT}.timer
+
+See log of most recent backup attempt:
+
+    ${BORG_DIR}/logs.sh
+    ${BORG_DIR}/logs.sh -f
+
+Start backup now:
+
+    sudo systemctl restart ${SYSTEMD_UNIT}
+
+Interrupt backup in progress:
+
+    sudo systemctl stop ${SYSTEMD_UNIT}
+
+Show backups and related info:
+
+    sudo ${BORG_DIR}/borg.sh info
+    sudo ${BORG_DIR}/borg.sh list
+
+Run Borg using the read-write SSH key:
+
+    sudo ${BORG_DIR}/borg.sh --rw list
+
+Mount and look at files:
+
+    mkdir mnt
+    sudo ${BORG_DIR}/borg.sh mount :: mnt
+    sudo -s # to explore as root
+    sudo umount mnt
+
+Update borg-setup from git:
+
+    cd /opt/borg
+    sudo git remote update
+    sudo git rebase origin/master
+    sudo ./inital-setup.sh --update
+    sudo git commit -m 'Update borg-setup'
+
+## Compaction and remote access
+
+Old backups are "pruned" automatically, but because the SSH key is
+append-only, no space is actually recovered on the server, it's just
+marked for deletion.  If you are sure that the client system was not
+compromised, then you can run compaction manually directly on the
+backup host by logging in via SSH (bitwarden `ssh ${BACKUP_HOST} /
+${BACKUP_USER}`) and compacting there:
+
+    ssh -p ${BACKUP_PORT} ${BACKUP_USER}@${BACKUP_HOST} borg/borg compact --verbose --progress ${BACKUP_REPO}
+
+This doesn't require the repo key.  That key shouldn't be entered on
+the untrusted backup host, so for operations that need it, use a
+trusted host and run borg remotely instead, e.g.:
+
+    ${BORG_BIN} --remote-path borg/borg info ssh://${BACKUP_USER}@${BACKUP_HOST}:${BACKUP_PORT}/borg/${HOSTNAME}
+
+The repo passphrase is in bitwarden `borg ${HOSTNAME} / repo key`.
+
+
+Design
+======
+
+- On server, we have a separate user account "jim-backups".  Password
+  for this account is in bitwarden in the "Backups" folder, under `ssh
+  backup.jim.sh`.
+
+- Repository keys are repokeys, which get stored on the server, inside
+  the repo.  Passphrases are stored:
+  - on clients (in `/opt/borg/passphrase`, for making backups)
+  - in bitwarden (under `borg <hostname>`, user `repo key`)
+
+- Each client has two passwordless SSH keys for connecting to the server:
+  - `/opt/borg/ssh/id_ecdsa_appendonly`
+    - configured on server for append-only operation
+    - used for making backups
+  - `/opt/borg/ssh/id_ecdsa_notify`
+    - configured on server for running `borg/notify.sh` only
+    - used for sending email notifications on errors
+
+- Systemd timers start daily backups:
+
+      /etc/systemd/system/borg-backup.service -> /opt/borg/borg-backup.service
+      /etc/systemd/system/borg-backup.timer -> /opt/borg/borg-backup.timer
+
+- Backup script `/opt/borg/backup.py` uses configuration in
+  `/opt/borg/config.yaml` to generate our own list of files, excluding
+  anything that's too large by default.  This requires borg 1.2 or newer.
+
+
+Notes
+=====
+
+# Building Borg binary from git
+
+    sudo apt install python3.9 scons libacl1-dev libfuse-dev libpython3.9-dev patchelf
+    git clone https://github.com/borgbackup/borg.git
+    cd borg
+    virtualenv --python=python3.9 borg-env
+    source borg-env/bin/activate
+    pip install -r requirements.d/development.txt
+    pip install pyinstaller
+    pip install llfuse
+    pip install -e .[llfuse]
+    pyinstaller --clean --noconfirm scripts/borg.exe.spec
+    pip install staticx
+
+    # for x86
+    staticx -l /lib/x86_64-linux-gnu/libm.so.6 dist/borg.exe borg.x86_64
+
+    # for ARM; see https://github.com/JonathonReinhart/staticx/issues/209
+    staticx -l /lib/arm-linux-gnueabihf/libm.so.6 dist/borg.exe borg.armv7l
+
+Then run `borg.x86_64`.  Confirm the version with `borg.armv7l --version`.
+
+*Note:* This uses the deprecated `llfuse` instead of the newer `pyfuse3`.
+`pyfuse3` doesn't work because, at minimum, it pulls in `trio` which
+requires `ssl` which is explicitly excluded by `scripts/borg.exe.spec`.

templates/logs.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+exec journalctl --all --unit ${SYSTEMD_UNIT} --since "$(systemctl show -P ExecMainStartTimestamp ${SYSTEMD_UNIT})" "$@"

templates/notify.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+set -e
+. "$(dirname "$0")"/vars.sh
+
+# Send notification email using a script on the backup host
+# First argument is our hostname, second argument is destination;
+# mail body is provided on stdin.
+
+if tty -s ; then
+    echo 'Refusing to read mail body from terminal'
+    exit 1
+fi
+
+SUMMARY="$1"
+EMAIL="$2"
+
+# Remote notify.sh wants subject as first line, not as an argument,
+# since it's a bit messy to pass complex strings through ssh command
+# lines.
+( echo "backup $HOSTNAME: $SUMMARY" ; cat ) | \
+    ssh \
+	-F "$SSH/config" \
+	-i "$SSH/id_ecdsa_notify" \
+        -p "$BACKUP_PORT" \
+	"$BACKUP_USER@$BACKUP_HOST" \
+	borg/notify.sh "$EMAIL"