Add playbook for borg

5 files changed, 126 insertions, 0 deletions

diff --git a/playbooks.d/backup-borg/description.txt b/playbooks.d/backup-borg/description.txt
new file mode 100644
index 0000000..18f5120
--- /dev/null
+++ b/playbooks.d/backup-borg/description.txt
@@ -0,0 +1 @@
+Backups managed with Borg and Borgmatic
diff --git a/playbooks.d/backup-borg/etc/defaults b/playbooks.d/backup-borg/etc/defaults
new file mode 100644
index 0000000..5b4b596
--- /dev/null
+++ b/playbooks.d/backup-borg/etc/defaults
@@ -0,0 +1 @@
+backup.user=root
diff --git a/playbooks.d/backup-borg/etc/os.d/linux-gentoo b/playbooks.d/backup-borg/etc/os.d/linux-gentoo
new file mode 100644
index 0000000..e0403ec
--- /dev/null
+++ b/playbooks.d/backup-borg/etc/os.d/linux-gentoo
@@ -0,0 +1,2 @@
+pkg.borg=app-backup/borgbackup
+pkg.borgmatic=app-backup/borgmatic
diff --git a/playbooks.d/backup-borg/playbook.bash b/playbooks.d/backup-borg/playbook.bash
new file mode 100644
index 0000000..8f91f8a
--- /dev/null
+++ b/playbooks.d/backup-borg/playbook.bash
@@ -0,0 +1,63 @@
+#!/usr/bin/env bash
+
+playbook_add() {
+	# TODO: Abort if backup.key is not set yet
+
+	pkg install borg
+	pkg install borgmatic
+
+	# Create a `borg1` for compatability with rsync.net
+	ln -s /usr/bin/borg /usr/local/bin/borg1
+
+	playbook_sync
+
+	info "$BASHTARD_PLAYBOOK" "Don't forget to add \`sysbackup\` to your crontab!"
+}
+
+playbook_sync() {
+	local config
+
+	config="$(getent passwd "$(config "backup.user")" | awk -F: '{ print $6 }')/.config/borgmatic/config.yaml"
+
+	mkdir -pv -- "$(dirname "$config")"
+
+	notice "$BASHTARD_PLAYBOOK" "Installing backup script"
+	file_template "backup.bash" \
+		> /usr/local/bin/sysbackup
+	chmod +x -- /usr/local/bin/sysbackup
+
+	# This is not going to be pretty, generating a YAML document from
+	# straight Bash, but the simple sed-based templating in Bashtard
+	# doesn't do loops, so this is the best I can do here.
+	notice "$BASHTARD_PLAYBOOK" "Generating borgmatic configuration"
+	printf "location:\n" > "$config"
+	printf "  source_directories:\n" >> "$config"
+
+	while read -r cpath
+	do
+		printf '  - "%s"\n' "$(config "$cpath")" >> "$config"
+	done < <(config_subkeys "backup.fs.paths")
+
+	printf "  repositories:\n" >> "$config"
+
+	while read -r cremote
+	do
+		printf '  - "%s"\n' "$(config "$cremote")" >> "$config"
+	done < <(config_subkeys "backup.fs.remotes")
+
+	printf "  one_file_system: true\n" >> "$config"
+	printf "  remote_path: borg1\n" >> "$config" # rsync.net wont work without this
+	printf "storage:\n" >> "$config"
+	printf "  encryption_passphrase: \"%s\"\n" "$(config "backup.key")" >> "$config"
+	printf "retention:\n" >> "$config"
+	printf "  keep_daily: 7\n" >> "$config"
+	printf "  keep_weekly: 4\n" >> "$config"
+	printf "  keep_monthly: 6\n" >> "$config"
+	printf "  keep_yearly: 1\n" >> "$config"
+}
+
+playbook_del() {
+	pkg uninstall borgmatic
+	pkg uninstall borg
+	rm -f -- /usr/local/bin/sysbackup
+}
diff --git a/playbooks.d/backup-borg/share/backup.bash b/playbooks.d/backup-borg/share/backup.bash
new file mode 100644
index 0000000..0f9d5b7
--- /dev/null
+++ b/playbooks.d/backup-borg/share/backup.bash
@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+
+main() {
+	BORG_PASSPHRASE="$(bashtard var backup.key | awk -F= '{ print $NF }')"
+
+	if [[ -z "$BORG_PASSPHRASE" ]]
+	then
+		return 3
+	fi
+
+	export BORG_PASSPHRASE
+
+	backup_filesystem
+	backup_database_postgresql
+}
+
+backup_filesystem() {
+	if ! command -v "borg" > /dev/null 2>&1
+	then
+		return 4
+	fi
+
+	if ! command -v "borgmatic" > /dev/null 2>&1
+	then
+		return 4
+	fi
+
+	borgmatic
+}
+
+backup_database_postgresql() {
+	if ! command -v "psql" > /dev/null 2>&1
+	then
+		return 4
+	fi
+
+	if ! command -v "pg_dump" > /dev/null 2>&1
+	then
+		return 4
+	fi
+
+	local remote
+
+	remote="$(bashtard var backup.db.postgresql.remote_base)"
+	PGUSER="$(bashtard var backup.db.postgresql.user | awk -F= '{ print $NF }')"
+
+	export PGUSER
+
+	while read -r database
+	do
+		[[ $database == "postgres" ]] && continue
+		[[ $database =~ template* ]] && continue
+
+		pg_dump "$database" \
+			| borg create "$remote-$database::$(date -u +%FT%TZ)"
+	done < <(psql -AXt -d template1 -c "SELECT datname FROM pg_database")
+}
+
+main "$@"