new workstation-duplicity script

Based on old propellor config.

1 files changed, 57 insertions, 0 deletions

diff --git a/bin/workstation-duplicity b/bin/workstation-duplicity
new file mode 100755
index 00000000..55c4c847
--- /dev/null
+++ b/bin/workstation-duplicity
@@ -0,0 +1,57 @@
+#!/bin/bash
+
+set -e
+
+. $HOME/.shenv
+
+FLAG_FILE="$HOME/local/duplicity-flag-file"
+DUPLY_PROFILE="$(hostname -s)-$USER-home"
+
+# ensure only one copy of this script is ever running at once
+[ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en "$0" "$0" "$@" ||:
+
+# ensure that the duply profile we want to use exists -- it's an error
+# if it doesn't because this script shouldn't be in our crontab if it
+# doesn't
+if ! [ -e "$HOME/.duply/$DUPLY_PROFILE/conf" ]; then
+    echo >&2 "workstation-duplicity: duply configuration missing"
+    exit 1
+fi
+
+# check when we last ran; don't run if it was less than four hours ago
+if [ -e "$FLAG_FILE" ] \
+       && [ -n "$(find $FLAG_FILE -newermt '4 hours ago')" ]; then
+    echo "flag file too new; not backing up"
+    exit 0
+fi
+
+# don't bother if we're not online
+if offline; then
+    echo "not online; not backing up"
+    exit 0
+fi
+
+# don't try to backup immediately; we might not be online for long
+sleep 600
+
+# confirm we're still online
+if offline; then
+    echo "not online; not backing up"
+    exit 0
+fi
+
+if [ -e "$FLAG_FILE" ]; then
+    # attempt an incremental backup
+    duply $DUPLY_PROFILE backup_purge --force
+else
+    # interpret lack of flag file to mean this host's OS has been
+    # reinstalled.  Do a full backup, as doing an incremental backup
+    # against the old host's filesystem is not useful.  This full
+    # backup won't be purged immediately (MAX_FULL_BACKUPS is 2), in
+    # case files need to be restored
+    duply $DUPLY_PROFILE full
+fi
+
+# if it was successful, update flag file so we don't do this again for
+# four hours
+touch $FLAG_FILE