squash groups of our snapshots into globs in list-all-subvolumes output

1 files changed, 33 insertions, 3 deletions

diff --git a/list-all-subvolumes b/list-all-subvolumes
index 89ffc15..7bc44d2 100755
--- a/list-all-subvolumes
+++ b/list-all-subvolumes
@@ -1,6 +1,5 @@
 #!/bin/bash
 set -e -o pipefail
-btrfs_subvolume_list_args=('-sr')
 btrfs_subvolume_list_args=('-a' "$@")
 
 list_all_subvolumes()
@@ -15,7 +14,15 @@ list_all_subvolumes()
             set -x
             mountpoint -q "$d" || mount -o ro,subvol=/ "$dev" "$d" || return
             btrfs subvolume list "$@" "$d"
-        ) || return
+        ) | extract_subvolume_path "${d##*/}" || return
+    done
+}
+
+extract_subvolume_path()
+{
+    while read _ id _ gen _ _ toplevel _ path
+    do
+        printf '%s/%s\n' "$1" "${path#<FS_TREE>/}"
     done
 }
 
@@ -27,4 +34,27 @@ list_btrfs()
     done | sort -u
 }
 
-list_all_subvolumes "${btrfs_subvolume_list_args[@]}"
+datetime_glob_a=.snapshot~[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]T[0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9]:[0-9][0-9]
+
+datetime_glob_b=*_mirror.[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9]_[0-9][0-9]:[0-9][0-9]:[0-9][0-9],[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9]:[0-9][0-9]
+
+squash_snapshots()
+{
+    while read line
+    do
+        if [[ $line == */$datetime_glob_a ]] || [[ $line == $datetime_glob_b ]]
+        then
+            echo "${line%.*}.*"
+        else
+            echo "$line"
+        fi
+    done | sort -u
+}
+
+#SQUASH_SNAPSHOTS=y
+if [ "$SQUASH_SNAPSHOTS" ]
+then
+    list_all_subvolumes "${btrfs_subvolume_list_args[@]}" | sort -u | squash_snapshots
+else
+    list_all_subvolumes "${btrfs_subvolume_list_args[@]}"
+fi