[Buildroot] [PATCH 1/1] support/scripts/mkusers: allow /etc/shadow to be symlinked

[Jens Maus]

This commit fixes a problem where it was not possible to replace
/etc/shadow with a symlink to a e.g. a user partition where the
shadow file is placed. This is required, e.g. for systems where the
rootfs is mounted read-only but users should still be able to be
added. Thus, if within an filesystem overlay setup a user tries
to replace /etc/shadow with a symlink to the real file on a user
partition a buildroot build stops with an error message because
sed is called on the symlink instead of following the symlink.
This commit fixes this shortcoming.

Signed-off-by: Jens Maus <mail at jens-maus.de>
---
 support/scripts/mkusers | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/support/scripts/mkusers b/support/scripts/mkusers
index 2ac76f986..e83aff6e0 100755
--- a/support/scripts/mkusers
+++ b/support/scripts/mkusers
@@ -303,7 +303,7 @@ add_one_user() {
 
     # Remove any previous instance of this user
     for _f in "${PASSWD}" "${SHADOW}"; do
-        sed -r -i -e '/^'"${username}"':.*/d;' "${_f}"
+        sed -r -i --follow-symlinks -e '/^'"${username}"':.*/d;' "${_f}"
     done
 
     _gid="$( get_gid "${group}" )"
-- 
2.11.0