make: add helper to rebase local branches to incorporate upstream changes

Makefile

@@ -31,6 +31,14 @@ 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
+
 .PHONY: clean
 clean:
 	rm -f README.html

README.md

@@ -89,7 +89,7 @@ Design
   - `/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`)
+    - 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.
@@ -104,7 +104,7 @@ Design
 - 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.
+  or newer.
 
 
 

backup.py

@@ -241,10 +241,8 @@ 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('-N', '--notify',
-                        help="Notify command", default=str(base / "notify.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",
@@ -253,6 +251,27 @@ def main(argv: list[str]):
     args = parser.parse_args()
     config = Config(args.config)
 
+    # Parse variables from vars.sh
+    hostname = os.uname().nodename
+    borg = str(base / "borg.sh")
+    notify = 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 = value
+                if var == "BORG_DIR":
+                    notify = pathlib.Path(value) / "notify.sh"
+    except Exception as e:
+        self.log('W', f"failed to parse variables from {args.vars}: {str(e)}")
+
     # Run backup
     backup = Backup(config, args.dry_run)
     captured_output: list[bytes] = []
@@ -275,7 +294,7 @@ def main(argv: list[str]):
                                  "--compression", "zstd,3",
                                  "--paths-from-stdin",
                                  "--paths-delimiter", "\\0",
-                                 "::{hostname}-{now:%Y%m%d-%H%M%S}"],
+                                 "::" + hostname + "-{now:%Y%m%d-%H%M%S}"],
                                 stdin=subprocess.PIPE,
                                 stdout=subprocess.PIPE,
                                 stderr=subprocess.STDOUT)

initial-setup.sh

@@ -1,9 +1,10 @@
 #!/bin/bash
 
 # These can be overridden when running this script
+HOSTNAME=${HOSTNAME:-$(hostname)}
 BACKUP_HOST=${BACKUP_HOST:-backup.jim.sh}
 BACKUP_USER=${BACKUP_USER:-jim-backups}
-BACKUP_REPO=${BACKUP_REPO:-borg/$(hostname)}
+BACKUP_REPO=${BACKUP_REPO:-borg/${HOSTNAME}}
 
 # Main dir is where this repo was checked out
 BORG_DIR="$(realpath "$(dirname "$0")")"
@@ -14,7 +15,7 @@ cd "${BORG_DIR}"
 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())')"
+HOSTID="${HOSTNAME}@$(python -c 'import uuid;print(uuid.getnode())')"
 
 function error_handler() {
     echo "Error at $1 line $2:"
@@ -86,7 +87,7 @@ create_borg_vars()
 export BACKUP_USER=${BACKUP_USER}
 export BACKUP_HOST=${BACKUP_HOST}
 export BACKUP_REPO=${BACKUP_REPO}
-export HOSTNAME=$(hostname)
+export HOSTNAME=${HOSTNAME}
 export BORG_REPO=${BORG_REPO}
 export BORG_HOST_ID=${HOSTID}
 export BORG_PASSCOMMAND="cat ${BORG_DIR}/passphrase"
@@ -273,7 +274,7 @@ EOF
 update_paths()
 {
     sed -i \
-        -e "s!\${HOSTNAME}!$(hostname)!g" \
+        -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" \
@@ -287,14 +288,14 @@ update_paths()
 
 git_setup()
 {
-    if ! git checkout -b "setup-$(hostname)" ; then
+    if ! git checkout -b "setup-${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 vars.sh
-    git commit -a -m "autocommit after initial setup on $(hostname)"
+    git commit -a -m "autocommit after initial setup on ${HOSTNAME}"
 }
 
 log "Configuration:"
@@ -315,11 +316,11 @@ git_setup
 echo
 notice "Add these two passwords to Bitwarden:"
 notice ""
-notice "      Name: borg $(hostname)"
+notice "      Name: borg ${HOSTNAME}"
 notice "  Username: read-write ssh key"
 notice "  Password: $PASS_SSH"
 notice ""
-notice "      Name: borg $(hostname)"
+notice "      Name: borg ${HOSTNAME}"
 notice "  Username: repo key"
 notice "  Password: $PASS_REPOKEY"
 notice ""