1 files changed, 128 insertions, 0 deletions
diff --git a/bin/backup b/bin/backup
new file mode 100755
index 0000000..cab37dc
--- /dev/null
+++ b/bin/backup
@@ -0,0 +1,128 @@
+#!/bin/sh
+set -eu
+
+usage() {
+	cat <<-'EOF'
+		Usage:
+		  backup [-v] [-C COMMENT] ARCHIVE_TAG
+		  backup -h
+	EOF
+}
+
+help() {
+	cat <<-'EOF'
+
+
+		Options:
+		  -v            enable verbose mode, useful for
+		                interactive sessions
+		  -C COMMENT    the comment text to be attached to the archive
+		  -h, --help    show this message
+
+		  ARCHIVE_TAG   the tag used to create the new
+		                backup (default: "cronjob")
+
+
+		The repository is expected to have been created with:
+
+		  $ borg init -e repokey-blake2
+
+		The following environment variables are expected to be exported:
+
+		  $BORG_PASSCOMMAND
+		  $BORG_REPO
+		  $BORG_REMOTE_PATH
+
+		Password-less SSH access is required, usually done via adding
+		~/.ssh/id_rsa.pub to suyin:.ssh/authorized_keys.
+
+
+		Examples:
+
+		  Run backup from cronjob:
+
+		    $ backup cronjob
+
+		  Create backup with comment, and verbose mode active:
+
+		    $ backup -vC 'The backup has a comment' my-backup
+	EOF
+}
+
+for flag in "$@"; do
+	case "$flag" in
+		--)
+			break
+			;;
+		--help)
+			usage
+			help
+			exit
+			;;
+		*)
+			;;
+	esac
+done
+
+VERBOSE_FLAGS=''
+COMMENT=''
+while getopts 'vC:h' flag; do
+	case "$flag" in
+		v)
+			VERBOSE_FLAGS='--verbose --progress'
+			;;
+		C)
+			COMMENT="$OPTARG"
+			;;
+		h)
+			usage
+			help
+			exit
+			;;
+		*)
+			usage >&2
+			exit 2
+			;;
+	esac
+done
+shift $((OPTIND - 1))
+
+assert_arg() {
+	if [ -z "$1" ]; then
+		printf 'Missing %s\n' "$2" >&2
+		usage >&2
+		exit 2
+	fi
+}
+
+ARCHIVE_TAG="${1:-}"
+assert_arg "$ARCHIVE_TAG" 'ARCHIVE_TAG'
+
+
+finish() {
+	STATUS=$?
+	printf '\n>>>\n>>> exit status: %s\n>>>\n\n' "$STATUS" >&2
+}
+trap finish EXIT
+
+run() {
+	borg create \
+		$VERBOSE_FLAGS                    \
+		--comment "$COMMENT"              \
+		--exclude ~/.cache/               \
+		--exclude ~/Downloads/            \
+		--stats                           \
+		--compression lzma,9              \
+		"::{hostname}-{now}-$ARCHIVE_TAG" \
+		~/
+	STATUS=$?
+
+	if [ "$STATUS" = 0 ] || [ "$STATUS" = 1 ]; then
+		echo 'WARNING, but no ERROR.' >&2
+		return 0
+	else
+		return "$STATUS"
+	fi
+}
+
+run || exit $?