checkpkg: set makepkg vars from build root to support none host archs

When building for an architecture different from the host, the correct
old package was downloaded as "$copydir"'s pacman was configured with
the target CARCH, but checkpkg doesn't know this and tries to search the
cache for host CARCH instead, producing the following error:

`==> ERROR: tarball not found for package: xxx`

This change fixes this by passing the appropriate makepkg config
explicitly, so that checkpkg behaves consistently.

Co-Authored-by: Levente Polyak <anthraxx@archlinux.org>
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

4 files changed, 57 insertions, 45 deletions

diff --git a/checkpkg.in b/checkpkg.in
index f40989d..aa862c5 100644
--- a/checkpkg.in
+++ b/checkpkg.in
@@ -6,23 +6,6 @@ shopt -s extglob
 
 m4_include(lib/common.sh)
 
-# Source makepkg.conf; fail if it is not found
-if [[ -r '/etc/makepkg.conf' ]]; then
-	# shellcheck source=makepkg-x86_64.conf
-	source '/etc/makepkg.conf'
-else
-	die '/etc/makepkg.conf not found!'
-fi
-
-# Source user-specific makepkg.conf overrides
-if [[ -r "${XDG_CONFIG_HOME:-$HOME/.config}/pacman/makepkg.conf" ]]; then
-	# shellcheck source=/dev/null
-	source "${XDG_CONFIG_HOME:-$HOME/.config}/pacman/makepkg.conf"
-elif [[ -r "$HOME/.makepkg.conf" ]]; then
-	# shellcheck source=/dev/null
-	source "$HOME/.makepkg.conf"
-fi
-
 usage() {
     cat <<- _EOF_
 		Usage: ${BASH_SOURCE[0]##*/} [OPTIONS]
@@ -35,40 +18,65 @@ usage() {
 		list for both packages and a library list for both packages.
 
 		OPTIONS
-		    -r, --rmdir     Remove the temporary directory
-		    -w, --warn      Print a warning in case of differences
-		    -h, --help      Show this help text
+		    -r, --rmdir          Remove the temporary directory
+		    -w, --warn           Print a warning in case of differences
+		    -M, --makepkg-config Set an alternate makepkg configuration file
+		    -h, --help           Show this help text
 _EOF_
 }
 
 RMDIR=0
 WARN=0
+MAKEPKG_CONF=/etc/makepkg.conf
+
+# option checking
+while (( $# )); do
+	case $1 in
+		-h|--help)
+			usage
+			exit 0
+			;;
+		-r|--rmdir)
+			RMDIR=1
+			shift
+			;;
+		-w|--warn)
+			WARN=1
+			shift
+			;;
+		-M|--makepkg-config)
+			MAKEPKG_CONF="$2"
+			shift 2
+			;;
+		--)
+			shift
+			break
+			;;
+		-*,--*)
+			die "invalid argument: %s" "$1"
+			;;
+		*)
+			break
+			;;
+	esac
+done
 
-OPT_SHORT='rwh'
-OPT_LONG=('rmdir' 'warn' 'help')
-if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
-    exit 1
+# Source makepkg.conf; fail if it is not found
+if [[ -r "${MAKEPKG_CONF}" ]]; then
+	# shellcheck source=makepkg-x86_64.conf
+	source "${MAKEPKG_CONF}"
+else
+	die "${MAKEPKG_CONF} not found!"
+fi
+
+# Source user-specific makepkg.conf overrides
+if [[ -r "${XDG_CONFIG_HOME:-$HOME/.config}/pacman/makepkg.conf" ]]; then
+	# shellcheck source=/dev/null
+	source "${XDG_CONFIG_HOME:-$HOME/.config}/pacman/makepkg.conf"
+elif [[ -r "$HOME/.makepkg.conf" ]]; then
+	# shellcheck source=/dev/null
+	source "$HOME/.makepkg.conf"
 fi
-set  -- "${OPTRET[@]}"
-
-while :; do
-    case $1 in
-        -r|--rmdir)
-            RMDIR=1
-            ;;
-        -w|--warn)
-            WARN=1
-            ;;
-        -h|--help)
-            usage
-            exit 0
-            ;;
-        --)
-            shift; break
-            ;;
-    esac
-    shift
-done
 
 if [[ ! -f PKGBUILD ]]; then
 	die 'This must be run in the directory of a built package.'
diff --git a/doc/checkpkg.1.asciidoc b/doc/checkpkg.1.asciidoc
index 6a70dbb..d95f350 100644
--- a/doc/checkpkg.1.asciidoc
+++ b/doc/checkpkg.1.asciidoc
@@ -29,6 +29,9 @@ Options
 *-w, --warn*::
 	Print a warning instead of a regular message in case of soname differences.
 
+*-M, --makepkg-config*::
+	Set an alternate makepkg configuration file.
+
 *-h, --help*::
 	Show a help text
 
diff --git a/makechrootpkg.in b/makechrootpkg.in
index 7944ada..126d1da 100644
--- a/makechrootpkg.in
+++ b/makechrootpkg.in
@@ -408,7 +408,7 @@ else
 		done
 
 		msg2 "Checking packages"
-		sudo -u "$makepkg_user" checkpkg --rmdir --warn "${remotepkgs[@]/#file:\/\//}"
+		sudo -u "$makepkg_user" checkpkg --rmdir --warn --makepkg-config "$copydir/etc/makepkg.conf" "${remotepkgs[@]/#file:\/\//}"
 	fi
 	true
 fi
diff --git a/zsh_completion.in b/zsh_completion.in
index 7a3516a..f640086 100644
--- a/zsh_completion.in
+++ b/zsh_completion.in
@@ -77,6 +77,7 @@ _rebuildpkgs_args=(
 _checkpkg_args=(
 	'(-r --rmdir)'{-r,--rmdir}'[Remove the temporary directory]'
 	'(-w --warn)'{-w,--warn}'[Print a warning in case of differences]'
+	'(-M --makepkg-config)'{-M,--makepkg-config}'[Location of a makepkg config file]:makepkg_config:_files -g "*.conf(.)"'
 	'(-h --help)'{-h,--help}'[Display usage]'
 )