makepkg: add basic support for alternatives

Alternatives are specified in makepkg via (e.g.):

alternative=('sh')

There should be a file (e.g.) sh.alternative alongside the PKGBUILD containing
a list of symlinks to be created with the alternative is active.  This file is
stored in the root of the package as (e.g.) .ALTERNATIVE.sh.

Signed-off-by: Allan McRae <allan@archlinux.org>

1 files changed, 41 insertions, 0 deletions

diff --git a/scripts/libmakepkg/lint_pkgbuild/alternative.sh.in b/scripts/libmakepkg/lint_pkgbuild/alternative.sh.in
new file mode 100644
index 00000000..75f71317
--- /dev/null
+++ b/scripts/libmakepkg/lint_pkgbuild/alternative.sh.in
@@ -0,0 +1,41 @@
+#!/bin/bash
+#
+#   alternative.sh - Check the files associated with the 'alternative'
+#   array exist.
+#
+#   Copyright (c) 2020 Pacman Development Team <pacman-dev@archlinux.org>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[[ -n "$LIBMAKEPKG_LINT_PKGBUILD_ALTERNATIVE_SH" ]] && return
+LIBMAKEPKG_LINT_PKGBUILD_ALTERNATIVE_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/pkgbuild.sh"
+source "$LIBRARY/lint_pkgbuild/util.sh"
+
+
+lint_pkgbuild_functions+=('lint_alternative')
+
+
+lint_alternative() {
+	local ret=0
+
+	check_files_exist 'alternative' "${alternative[@]/%/.alternative}" || ret=1
+
+	return $ret
+}