handle situations when dracut is already installed in the target system

1 files changed, 20 insertions, 11 deletions

diff --git a/builder/dnbd3-rootfs/hooks/copy-dracut-systemd-files-into-newroot.sh b/builder/dnbd3-rootfs/hooks/copy-dracut-systemd-files-into-newroot.sh
index 1bce5ffb..d308decd 100755
--- a/builder/dnbd3-rootfs/hooks/copy-dracut-systemd-files-into-newroot.sh
+++ b/builder/dnbd3-rootfs/hooks/copy-dracut-systemd-files-into-newroot.sh
@@ -10,6 +10,13 @@ exceptions.activate
 logging.set_commands_level debug
 logging.set_level debug
 
+# Needed to be able to go back to dracut at system shutdown.
+temporary_directory_path="$(mktemp --directory)"
+mount --options bind / "$temporary_directory_path"
+cp --recursive --no-target-directory "$temporary_directory_path" /run/initramfs
+umount "$temporary_directory_path"
+rm --dir "$temporary_directory_path"
+
 # Dracut may not be installed on the new root. Thus copy all services over.
 systemd_system_unit_path="$(dirname "$(find / -name dracut-mount.service \
     -type f -print -quit)")"
@@ -25,19 +32,21 @@ for file in \
     dracut-pre-trigger.service \
     dracut-pre-udev.service
 do
-    cp "${systemd_system_unit_path}/${file}" \
-        "${new_systemd_system_unit_path}/${file}"
-    ln --symbolic "../${file}" \
-        "${new_systemd_system_unit_path}/initrd.target.wants/${file}"
+    exceptions.try
+    {
+        cp "${systemd_system_unit_path}/${file}" \
+            "${new_systemd_system_unit_path}/${file}"
+        # ln returns an error if the link already exists
+        ln --symbolic "../${file}" \
+            "${new_systemd_system_unit_path}/initrd.target.wants/${file}"
+    }
+    exceptions.catch
+    {
+        logging.warn "failed to copy dracut service files to NEWROOT, " \
+            "maybe they already is already installed in the template system"
+    }
 done
 
-# Needed to be able to go back to dracut at system shutdown.
-temporary_directory_path="$(mktemp --directory)"
-mount --options bind / "$temporary_directory_path"
-cp --recursive --no-target-directory "$temporary_directory_path" /run/initramfs
-umount "$temporary_directory_path"
-rm --dir "$temporary_directory_path"
-
 ); result=$?; exceptions.deactivate; [[ $result == 0 ]] || exit 1
 # region vim modline