Fixes #310. Add '-f' to 'rm' command in uninstall hooks to avoid error messages if files do not exist.

[spuck]

Also, quoting directory names in calls to "rm".

[atheik]

@spuck,

Thank you for the PKG_CHECK_VAR fix.

Please leave out your changes to the uninstall-hook targets in this commit.
Giving -f as an option to rm does get rid of the ENOENT messages, but those messages are harmless.
As for quoting the path argument to rm, you are right that the expansion of a user-defined DESTDIR can result in multiple arguments to rm, e.g. when DESTDIR contains spaces, but in-practice most Autotooled projects don't seem to bother with proper quoting. Besides, if you do want to quote them, then quote also the DESTDIR expansions in the install-exec-hook targets.

When in your fix_old_pkg-config branch, you can reset to the latest commit and "undo" it like this:

git reset --hard
git reset HEAD~

You can then remove your changes to the uninstall-hook targets:

git checkout addshare/Makefile.am adduser/Makefile.am control/Makefile.am mountd/Makefile.am

At this point you might fix the indentation in the PKG_CHECK_VAR definition you added to configure.ac.

You can give the commit message from a file by using the -F option of git commit.
In the commit message, the first line is the commit title and should be prefixed with ksmbd-tools: .
After the title, there should be a blank line followed by the rest of the commit message.

The msg file could look like this:

ksmbd-tools: add PKG_CHECK_VAR macro for pre-0.28 pkg-config

The PKG_CHECK_VAR macro was added in pkg-config 0.28, which is too new
for some still-supported distros. Vendor it from pkg-config and use it
if left undefined.

You can then commit these changes with git commit -asF msg and update this PR with git push -f.

If you don't want to bother with updating this PR, then would you consider giving your approval for this commit:

[PATCH] ksmbd-tools: add PKG_CHECK_VAR macro for pre-0.28 pkg-config (click the arrow to expand)

From 782d583e1dad8e17bf7993df0f7aba369ae00d1d Mon Sep 17 00:00:00 2001
From: Travis Hayes <travis.hayes@sdl.usu.edu>
Date: Fri, 17 Nov 2023 02:29:23 +0200
Subject: [PATCH] ksmbd-tools: add PKG_CHECK_VAR macro for pre-0.28 pkg-config

The PKG_CHECK_VAR macro was added in pkg-config 0.28, which is too new
for some still-supported distros. Vendor it from pkg-config and use it
if left undefined.

Signed-off-by: Travis Hayes <travis.hayes@sdl.usu.edu>
---
 configure.ac | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/configure.ac b/configure.ac
index de5158b..76935e3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -27,6 +27,23 @@ AC_PROG_SED
 AC_PROG_MKDIR_P
 AC_PROG_LN_S
 
+# Check if PKG_CHECK_VAR exists for compatibility with older (pre-version 0.28) pkg-config
+m4_ifndef([PKG_CHECK_VAR], [
+	# PKG_CHECK_VAR(VARIABLE, MODULE, CONFIG-VARIABLE,
+	# [ACTION-IF-FOUND], [ACTION-IF-NOT-FOUND])
+	# -------------------------------------------
+	# Retrieves the value of the pkg-config variable for the given module.
+	AC_DEFUN([PKG_CHECK_VAR],
+	[AC_REQUIRE([PKG_PROG_PKG_CONFIG])dnl
+	AC_ARG_VAR([$1], [value of $3 for $2, overriding pkg-config])dnl
+
+	_PKG_CONFIG([$1], [variable="][$3]["], [$2])
+	AS_VAR_COPY([$1], [pkg_cv_][$1])
+
+	AS_VAR_IF([$1], [""], [$5], [$4])dnl
+	])# PKG_CHECK_VAR
+])
+
 AC_SUBST([in_script], [[\
 '$(SED) -e "s,[@]sbindir[@],$(sbindir),g" \
         -e "s,[@]sysconfdir[@],$(sysconfdir),g" \
-- 
2.42.1

I have not extensively tested this but I trust you have.