relink_symlinks

#!/bin/sh

# We cannot use "readlink -f" command because it doesn't know about $RPM_BUILD_ROOT
# and follows symlinks on real filesystem instead of $RPM_BUILD_ROOT
readlink_f() {
	__symlink="$(readlink $1)"
	if [ -z "$__symlink" ]; then
		printf '%s\n' $1 | sed s,"$RPM_BUILD_ROOT",,
	else
		readlink_f "$RPM_BUILD_ROOT$__symlink"
	fi
}

if [ -z "$RPM_BUILD_ROOT" ]; then
	printf '%s\n' "No build root defined" >&2
	exit 1
fi

if [ ! -d "$RPM_BUILD_ROOT" ]; then
	printf '%s\n' "Invalid build root" >&2
	exit 1
fi

find "$RPM_BUILD_ROOT" \
	-type l -print0 | xargs --no-run-if-empty -0 ls 2>/dev/null |
while read symlink; do
	path="$(readlink_f "$symlink")"

	printf '%s\n' $path | grep -q -E '^(/dev|/sys|/proc)' && continue
	# skip non-absolute path
	if printf '%s\n' $path | grep -q -E '^/'; then
		# absolute path needs to be made into an absolute path relative to buildroot
		path="$RPM_BUILD_ROOT$path"
		if stat "$path" &> /dev/null; then
			rm "$symlink"
			# ln will try follow symlink if source exists as symlink, so let's move
			# it out of the way first, then back afterwards
			stat "$path" &> /dev/null && mv "$path" "$path.origlink"
			output="$(ln -svr "$path" "$symlink" 2>&1)"
			stat "$path.origlink" &> /dev/null && mv "$path.origlink" "$path"
			if ! stat "$symlink" &> /dev/null; then
				printf '%s\n' "symlink relativization failed:" >&2
				printf '%s\n' "$output" >&2
				ls --color -l "$symlink" >&2
			fi
		fi
	fi
done