scripts

commit 96bb945ae6cf1597aa3ba65e9a47309cdd748ea1
parent a91ced62313a01f48f1ec169310c1731afec672c
Author: Christos Margiolis <christos@margiolis.net>
Date:   Sun,  3 Apr 2022 23:19:31 +0300

make it work with datasets as well

Diffstat:
M
backup
 | 
12
+++++-------

1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/backup b/backup
@@ -2,7 +2,7 @@
 
 usage()
 {
-	echo "usage: ${0##*/} [-ir] <src> <dst>" 1>&2
+	echo "usage: ${0##*/} [-ir] src[/set] dst[/set]" 1>&2
 	exit 1
 }
 
@@ -14,7 +14,7 @@ err()
 
 pool_exists()
 {
-	local foo=$(zpool list -o name | sed 1d | grep -x "${1}")
+	local foo=$(zfs list -o name | sed 1d | grep -x "${1}")
 
 	test -z "${foo}" && err "pool ${1} does not exist"
 }
@@ -24,6 +24,8 @@ last_snap()
 	zfs list -t snapshot -o name "${1}" | cut -f2 -d'@' | tail -1
 }
 
+# Make appropriate checks before creating new snapshot.
+# If the snapshot already exists, either renew it or exit.
 delete_existing_snap()
 {
 	local pool=${1}
@@ -60,14 +62,10 @@ src_last_snap=$(last_snap "${src_pool}")
 dst_last_snap=$(last_snap "${dst_pool}")
 nsnaps=$(zfs list -t snapshot -o name ${dst_pool} | sed 1d | wc -l)
 
-# Make appropriate checks before creating new snapshot.
-# If the snapshot already exists, either renew it or exit.
 delete_existing_snap "${src_pool}" "${src_last_snap}"
 zfs snapshot -r ${src_pool}@${new_snap}
 
-# Overwrite dst snapshot if it already exists when the -r option is passed,
-# otherwise, exit. Also make sure there are more than 1 snapshots before we
-# delete anything.
+# Make sure dst has more than 1 snapshots before we delete anything.
 test ${nsnaps} -le 1 || delete_existing_snap "${dst_pool}" "${dst_last_snap}"
 
 if [ ${f_incr} -eq 1 ]; then