livepatch-build: Do not follow every symlink for patch file

In some build systems symlinks might be used for patch file names
to point from target directories to actual patches. Following those
symlinks breaks naming convention as the resulting built modules
would be named after the actual hardlink insteads of the symlink.

Livepatch-build obtains hotpatch name from the patch file, so it
should not canonicalize the file path resolving all the symlinks to
not lose the original symlink name.

Signed-off-by: Pawel Wieczorkiewicz <wipawel@amazon.de>
Reviewed-by: Martin Pohlack <mpohlack@amazon.de>
Reviewed-by: Bjoern Doebel <doebel@amazon.de>
Reviewed-by: Norbert Manthey <nmanthey@amazon.de>

diff --git a/livepatch-build b/livepatch-build
index c057fa1974b57d7e29bcc682f0ea641a3722c071..796838c42487fdbf99b486590b4e8c8e3f464d3b 100755 (executable)
--- a/livepatch-build
+++ b/livepatch-build
@@ -265,7 +265,9 @@ done
 [ -z "$DEPENDS" ] && die "Build-id dependency not given"
 
 SRCDIR="$(readlink -m -- "$srcarg")"
-PATCHFILE="$(readlink -m -- "$patcharg")"
+# We need an absolute path because we move around, but we need to
+# retain the name of the symlink (= realpath -s)
+PATCHFILE="$(readlink -f "$(dirname "$patcharg")")/$(basename "$patcharg")"
 CONFIGFILE="$(readlink -m -- "$configarg")"
 OUTPUT="$(readlink -m -- "$outputarg")"