lib/common-functions: recursively_umount_and_rm(): check that argument is directory

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/common-functions b/lib/common-functions
index 9ba495c..6ff5b2c 100755
--- a/lib/common-functions
+++ b/lib/common-functions
@@ -390,6 +390,12 @@ recursively_umount_and_rm() {
     exit 42
   fi
 
+  if [ ! -d "${dir}" ]; then
+    >&2 printf 'ERROR: recursively_umount_and_rm requires a directory as argument - "%s" is not\n' \
+      "${dir}"
+    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()