From 2d3827b12d0eda00f28147905ea579d3d07df02c Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Wed, 17 Apr 2019 13:47:54 +0200
Subject: lib/common-functions: recursively_umount_and_rm(): copy stuff from
 archlinux/devtool's lib/archroot.sh: is_subvolume(), is_same_fs() and
 subvolume_delete_recursive() - now it should do the correct thing on btrfs,
 too

---
 lib/common-functions | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

(limited to 'lib/common-functions')

diff --git a/lib/common-functions b/lib/common-functions
index e87e6ef..17309fb 100755
--- a/lib/common-functions
+++ b/lib/common-functions
@@ -390,10 +390,25 @@ recursively_umount_and_rm() {
     exit 42
   fi
 
+  # the sh -c '...' construct branch below is borrowed from
+  # archlinux/devtools lib/archroot.sh: is_subvolume(), is_same_fs() and
+  # subvolume_delete_recursive()
+  # shellcheck disable=SC1004,SC2016
   find "${dir}" \
-    -xdev -depth -type d \
+    -depth \
+    -xdev \
+    -type d \
     -exec 'mountpoint' '-q' '{}' ';' \
-    -exec 'sudo' 'umount' '-l' '{}' ';'
+    -exec 'sudo' 'umount' '-l' '{}' ';' \
+    -prune \
+    , \
+    -inum 256 \
+    -exec sh -c '
+      [ "$(stat -f -c %T "$1")" = btrfs ] && \
+      [ "$(stat -c %d "$1")" = "$2" ]
+    ' {} "$(stat -c %d "${dir}")" \; \
+    -exec btrfs subvolume delete {} \; \
+    -prune
   rm -rf --one-file-system "${dir}"
 }
 
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