wip: clean all existing makepkg conf.d files before overriding

Previously we have only copied the passed makepkg.conf file into the
chroot, which misses build flags for additional language specific files
that makepkg supports. Fix this by extracting all conf.d makepkg config
files from the detected devtools archive.

Component: makerepropkg
Co-authored-by: Christian Heusel <christian@heusel.eu>

doc/man/arch-nspawn.1.asciidoc

@@ -23,7 +23,8 @@ Options
 	Location of a pacman config file
 
 *-M* <file>::
-	Location of a makepkg config file
+	Location of a makepkg config file. Specific additions (e.g. build flags for
+	additional languages) can be placed in '<file>.d/*.conf'.
 
 *-c* <dir>::
 	Set pacman cache, if no directory is specified the passed pacman.conf's cachedir is used with a fallback to '/etc/pacman.conf'

doc/man/makerepropkg.1.asciidoc

@@ -49,7 +49,8 @@ Options
 	Set the pacman cache directory.
 
 *-M* <file>::
-	Location of a makepkg config file.
+	Location of a makepkg config file. Specific additions (e.g. build flags for
+	additional languages) can be placed in '<file>.d/*.conf'.
 
 *-l* <chroot>::
 	The directory name to use as the chroot namespace

src/arch-nspawn.in

@@ -112,7 +112,16 @@ copy_hostconf () {
 	[[ -n $host_cachemirrors ]] && printf 'CacheServer = %s\n' "${host_cachemirrors[@]}" >>"$working_dir/etc/pacman.d/mirrorlist"
 
 	[[ -n $pac_conf ]] && cp "$pac_conf" "$working_dir/etc/pacman.conf"
-	[[ -n $makepkg_conf ]] && cp "$makepkg_conf" "$working_dir/etc/makepkg.conf"
+	if [[ -n $makepkg_conf ]]; then
+		cp "$makepkg_conf" "$working_dir/etc/makepkg.conf"
+		if [[ -d "${makepkg_conf}.d" ]] && is_globfile "${makepkg_conf}.d"/*.conf; then
+			mkdir --parents "$working_dir/etc/makepkg.conf.d/"
+			if is_globfile "$working_dir/etc/makepkg.conf.d"/*.conf; then
+				rm --force "$working_dir/etc/makepkg.conf.d"/*.conf
+			fi
+			cp "${makepkg_conf}.d/"*.conf "$working_dir/etc/makepkg.conf.d/"
+		fi
+	fi
 
 	local file
 	for file in "${files[@]}"; do

src/makerepropkg.in

@@ -93,14 +93,36 @@ get_makepkg_conf() {
     local fname=${1}
     local arch="${2}"
     local makepkg_conf="${3}"
+
     if ! buildtool_file=$(get_pkgfile "${fname}"); then
        error "failed to retrieve ${fname}"
        return 1
     fi
-    msg2 "using makepkg.conf from ${fname}"
-	if ! bsdtar xOqf "${buildtool_file/file:\/\//}" "usr/share/devtools/makepkg.conf.d/${arch}.conf" > "${makepkg_conf}"; then
-		bsdtar xOqf "${buildtool_file/file:\/\//}" "usr/share/devtools/makepkg-${arch}.conf" > "${makepkg_conf}"
+    buildtool_file="${buildtool_file/file:\/\//}"
+    msg "using makepkg.conf from ${fname}"
+
+    # try to handle config of legacy devtools
+    if bsdtar --list --file "${buildtool_file}" "usr/share/devtools/makepkg-${arch}.conf" &>/dev/null; then
+        bsdtar --extract --to-stdout --fast-read --file "${buildtool_file}" "usr/share/devtools/makepkg-${arch}.conf" > "${makepkg_conf}"
+        return $?
     fi
+
+    msg2 "extracting ${arch}.conf from devtools archive"
+    if ! bsdtar --extract --to-stdout --fast-read --file "${buildtool_file}" "usr/share/devtools/makepkg.conf.d/${arch}.conf" > "${makepkg_conf}"; then
+        error "failed to extract 'usr/share/devtools/makepkg.conf.d/${arch}.conf' from devtools archive"
+        return 1
+    fi
+
+    mkdir --parents "${makepkg_conf}.d"
+    if bsdtar --list --file "${buildtool_file}" "usr/share/devtools/makepkg.conf.d/conf.d" &>/dev/null; then
+        msg2 "extracting conf.d from devtools archive"
+        bsdtar --extract --file "${buildtool_file}" --cd "${makepkg_conf}.d" --strip-components 4 "usr/share/devtools/makepkg.conf.d/conf.d"
+    fi
+    if bsdtar --list --file "${buildtool_file}" "usr/share/devtools/makepkg.conf.d/${arch}.conf.d" &>/dev/null; then
+        msg2 "extracting ${arch}.conf.d from devtools archive"
+        bsdtar --extract --file "${buildtool_file}" --cd "${makepkg_conf}.d" --strip-components 4 "usr/share/devtools/makepkg.conf.d/${arch}.conf.d"
+    fi
+
     return 0
 }