[OE-core] [PATCHv2] initscripts: remove warnings on read-only-rootfs (again)

[Jacob Kroon]

From: Martin Hundebøll <martin at geanix.com>

When the populate-volatile.sh initscript tests if a configured symlink
is already in place, it uses readlink with the '-f' (follow) option:

> [ "$(readlink -f $source)" = "$dest" ]

If the test fails, it proceeds to delete the exisiting folder/file, and
create the configured symlink.

However, the '-f' option to readlink makes it follow symlinks pointing
at symlinks. If the $dest argument is a symlink, the above test fails,
and warnings are printed due to changing a read-only rootfs.

This is the case for /tmp, and /etc/resolv.conf:
> /tmp -> /var/tmp -> /var/volatile/tmp
> /etc/resolv.conf -> /var/run/resolv.conf -> /run/resolv.conf

Fix the warnings by removing the '-f' option, so that the test matches
the configuration.

[ YOCTO #10814 ]

Signed-off-by: Martin Hundebøll <martin at geanix.com>
Signed-off-by: Jacob Kroon <jacob.kroon at gmail.com>
---

v2:
 * Added my own signed-off-by tag
 * Added reference to YOCTO #10814
 * Original patch: https://patchwork.openembedded.org/patch/152602/

 .../initscripts/initscripts-1.0/populate-volatile.sh            | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
index 6f965a6870..1c525b71bd 100755
--- a/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
+++ b/meta/recipes-core/initscripts/initscripts-1.0/populate-volatile.sh
@@ -80,7 +80,7 @@ mk_dir() {
 link_file() {
 	EXEC="
 	if [ -L \"$2\" ]; then
-		[ \"\$(readlink -f \"$2\")\" != \"$1\" ] && { rm -f \"$2\"; ln -sf \"$1\" \"$2\"; };
+		[ \"\$(readlink \"$2\")\" != \"$1\" ] && { rm -f \"$2\"; ln -sf \"$1\" \"$2\"; };
 	elif [ -d \"$2\" ]; then
 		if awk '\$2 == \"$2\" {exit 1}' /proc/mounts; then
 			cp -a $2/* $1 2>/dev/null;
-- 
2.21.0