libmakepkg: Add basic rules to lint makepkg.conf variables

Currently the only things we check are:

- Things that should be arrays, are not strings, and vice versa (this
  was mostly copy-pasted from the similar code in lint_pkgbuild).
- Variables that are meant to contain pathname components cannot contain
  a newline character, because newline characters in pathnames are weird
  and also don't play well with future changes intended for the
  --packagelist option.

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

scripts/Makefile.am

@@ -44,6 +44,7 @@ libmakepkgdir = $(datarootdir)/makepkg
 
 LIBMAKEPKGDIRS = \
 	integrity \
+	lint_config \
 	lint_package \
 	lint_pkgbuild \
 	source \
@@ -56,6 +57,9 @@ LIBMAKEPKG_IN = \
 	libmakepkg/integrity/generate_signature.sh \
 	libmakepkg/integrity/verify_checksum.sh \
 	libmakepkg/integrity/verify_signature.sh \
+	libmakepkg/lint_config.sh \
+	libmakepkg/lint_config/paths.sh \
+	libmakepkg/lint_config/variable.sh \
 	libmakepkg/lint_package.sh \
 	libmakepkg/lint_package/build_references.sh \
 	libmakepkg/lint_package/dotfiles.sh \

scripts/libmakepkg/lint_config.sh.in

@@ -0,0 +1,46 @@
+#!/usr/bin/bash
+#
+#   lint_config.sh - functions for checking for makepkg.conf errors
+#
+#   Copyright (c) 2018 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 "$LIBMAKEPKG_LINT_CONFIG_SH" ]] && return
+LIBMAKEPKG_LINT_CONFIG_SH=1
+
+LIBRARY=${LIBRARY:-'/usr/share/makepkg'}
+
+source "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/util.sh"
+
+
+declare -a lint_config_functions
+
+for lib in "$LIBRARY/lint_config/"*.sh; do
+	source "$lib"
+done
+
+readonly -a lint_config_functions
+
+
+lint_config() {
+	local ret=0
+
+	for func in ${lint_config_functions[@]}; do
+		$func || ret=1
+	done
+	return $ret
+}

scripts/libmakepkg/lint_config/paths.sh.in

@@ -0,0 +1,46 @@
+#!/bin/bash
+#
+#   paths.sh - Check that pathname components do not contain odd characters
+#
+#   Copyright (c) 2018 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 "$LIBMAKEPKG_LINT_CONFIG_PATHS_SH" ]] && return
+LIBMAKEPKG_LINT_CONFIG_PATHS_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+source "$LIBRARY/util/pkgbuild.sh"
+
+lint_config_functions+=('lint_paths')
+
+
+lint_paths() {
+	local pathvars=(BUILDDIR PKGDEST SRCDEST SRCPKGDEST LOGDEST PKGEXT SRCEXT)
+
+	local i ret=0
+
+	for i in ${pathvars[@]}; do
+		if [[ ${!i} = *$'\n'* ]]; then
+			error "$(gettext "%s contains invalid characters: '%s'")" \
+					"$i" "${!i//[^$'\n']}"
+			ret=1
+		fi
+	done
+
+	return $ret
+}

scripts/libmakepkg/lint_config/variable.sh.in

@@ -0,0 +1,64 @@
+#!/bin/bash
+#
+#   variable.sh - Check that variables are or are not arrays as appropriate
+#
+#   Copyright (c) 2018 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 "$LIBMAKEPKG_LINT_CONFIG_VARIABLE_SH" ]] && return
+LIBMAKEPKG_LINT_CONFIG_VARIABLE_SH=1
+
+LIBRARY=${LIBRARY:-'@libmakepkgdir@'}
+
+source "$LIBRARY/util/message.sh"
+
+lint_config_functions+=('lint_variable')
+
+
+lint_variable() {
+	local array=(DLAGENTS VCSCLIENTS BUILDENV OPTIONS INTEGRITY_CHECK MAN_DIRS
+	             DOC_DIRS PURGE_TARGETS COMPRESSGZ COMPRESSBZ2 COMPRESSXZ
+	             COMPRESSLRZ COMPRESSLZO COMPRESSZ)
+	local string=(CARCH CHOST CPPFLAGS CFLAGS CXXFLAGS LDFLAGS DEBUG_CFLAGS
+	              DEBUG_CXXFLAGS DISTCC_HOSTS BUILDDIR STRIP_BINARIES STRIP_SHARED
+	              STRIP_STATIC PKGDEST SRCDEST SRCPKGDEST LOGDEST PACKAGER GPGKEY
+	              PKGEXT SRCEXT)
+
+	local i keys ret=0
+
+	# global variables
+	for i in ${array[@]}; do
+		eval "keys=(\"\${!$i[@]}\")"
+		if (( ${#keys[*]} > 0 )); then
+			if ! is_array $i; then
+				error "$(gettext "%s should be an array")" "$i"
+				ret=1
+			fi
+		fi
+	done
+
+	for i in ${string[@]}; do
+		eval "keys=(\"\${!$i[@]}\")"
+		if (( ${#keys[*]} > 0 )); then
+			if is_array $i; then
+				error "$(gettext "%s should not be an array")" "$i"
+				ret=1
+			fi
+		fi
+	done
+
+	return $ret
+}

scripts/makepkg.sh.in

@@ -1365,6 +1365,10 @@ else
 fi
 
 
+# check makepkg.conf for some basic requirements
+lint_config || exit $E_CONFIG_ERROR
+
+
 # check that all settings directories are user-writable
 if ! ensure_writable_dir "BUILDDIR" "$BUILDDIR"; then
 	plain "$(gettext "Aborting...")"