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 <[email protected]>
---

v3: rm useless logging message

 scripts/Makefile.am                           |  4 ++
 scripts/libmakepkg/lint_config.sh.in          | 46 +++++++++++++++++++
 scripts/libmakepkg/lint_config/paths.sh.in    | 46 +++++++++++++++++++
 scripts/libmakepkg/lint_config/variable.sh.in | 64 +++++++++++++++++++++++++++
 scripts/makepkg.sh.in                         |  4 ++
 5 files changed, 164 insertions(+)
 create mode 100755 scripts/libmakepkg/lint_config.sh.in
 create mode 100644 scripts/libmakepkg/lint_config/paths.sh.in
 create mode 100644 scripts/libmakepkg/lint_config/variable.sh.in

diff --git a/scripts/Makefile.am b/scripts/Makefile.am
index 8cf79f21..7fe169b3 100644
--- a/scripts/Makefile.am
+++ b/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 \
diff --git a/scripts/libmakepkg/lint_config.sh.in 
b/scripts/libmakepkg/lint_config.sh.in
new file mode 100755
index 00000000..bad68bcb
--- /dev/null
+++ b/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 <[email protected]>
+#
+#   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 $ret
+}
diff --git a/scripts/libmakepkg/lint_config/paths.sh.in 
b/scripts/libmakepkg/lint_config/paths.sh.in
new file mode 100644
index 00000000..c75765ff
--- /dev/null
+++ b/scripts/libmakepkg/lint_config/paths.sh.in
@@ -0,0 +1,46 @@
+#!/bin/bash
+#
+#   paths.sh - Check that pathname components do not contain odd characters
+#
+#   Copyright (c) 2018 Pacman Development Team <[email protected]>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[[ -n "$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_variable')
+
+
+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 $ret
+}
diff --git a/scripts/libmakepkg/lint_config/variable.sh.in 
b/scripts/libmakepkg/lint_config/variable.sh.in
new file mode 100644
index 00000000..14bd0e05
--- /dev/null
+++ b/scripts/libmakepkg/lint_config/variable.sh.in
@@ -0,0 +1,64 @@
+#!/bin/bash
+#
+#   variable.sh - Check that variables are or are not arrays as appropriate
+#
+#   Copyright (c) 2018 Pacman Development Team <[email protected]>
+#
+#   This program is free software; you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation; either version 2 of the License, or
+#   (at your option) any later version.
+#
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+[[ -n "$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
+}
diff --git a/scripts/makepkg.sh.in b/scripts/makepkg.sh.in
index a22bcce2..f0703d41 100644
--- a/scripts/makepkg.sh.in
+++ b/scripts/makepkg.sh.in
@@ -1361,6 +1361,10 @@ 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...")"
-- 
2.16.2

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