[PATCH 4/6] dist-kernel-utils.eclass: check if symlink exists before updating

When quickpkg is used the pkg_preinst phase may be run twice.
Therefore we should check first if the incorrect symlink is still
present before attempting to update it for the merged-usr layout.

Closes: https://bugs.gentoo.org/977187
Signed-off-by: Nowa Ammerlaan <[email protected]>
---
 eclass/dist-kernel-utils.eclass | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/eclass/dist-kernel-utils.eclass b/eclass/dist-kernel-utils.eclass
index 78cdd1fa2de7..c41b1aa494cd 100644
--- a/eclass/dist-kernel-utils.eclass
+++ b/eclass/dist-kernel-utils.eclass
@@ -425,10 +425,13 @@ dist-kernel_update_lib_symlinks() {
 
 	if [[ -L ${EROOT}/lib && ${EROOT}/lib -ef ${EROOT}/usr/lib ]]; then
 		# Adjust symlinks for merged-usr.
-		rm "${ED}/lib/modules/${version}"/{build,source} || die
-		dosym "../../../src/linux-${version}" "/usr/lib/modules/${version}/build"
-		dosym "../../../src/linux-${version}" "/usr/lib/modules/${version}/source"
 		local file
+		for file in build source; do
+			if [[ -L "${ED}/lib/modules/${version}/${file}" ]]; then
+				rm "${ED}/lib/modules/${version}/${file}" || die
+				dosym "../../../src/linux-${version}" "/usr/lib/modules/${version}/${file}"
+			fi
+		done
 		for file in .config System.map; do
 			if [[ -L "${ED}/lib/modules/${version}/${file#.}" ]]; then
 				rm "${ED}/lib/modules/${version}/${file#.}" || die
-- 
2.54.0