checkpkg: add option to print a warning in case of differences

Sometimes its desired to be explicitly made aware of differences
reporter by checkpkg via printing a warning instead of a regular
message.

Automatically use --warn for makechrootpkg builds so packagers are made
visibly aware of a soname bump by simply looking out for colors
indicating non success messages.

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

checkpkg.in

@@ -35,14 +35,16 @@ usage() {
 
 		OPTIONS
 		    -r, --rmdir     Remove the temporary directory
+		    -w, --warn      Print a warning in case of differences
 		    -h, --help      Show this help text
 _EOF_
 }
 
 RMDIR=0
+WARN=0
 
-OPT_SHORT='rh'
-OPT_LONG=('rmdir' 'help')
+OPT_SHORT='rwh'
+OPT_LONG=('rmdir' 'warn' 'help')
 if ! parseopts "$OPT_SHORT" "${OPT_LONG[@]}" -- "$@"; then
     exit 1
 fi
@@ -53,6 +55,9 @@ while :; do
         -r|--rmdir)
             RMDIR=1
             ;;
+        -w|--warn)
+            WARN=1
+            ;;
         -h|--help)
             usage
             exit 0
@@ -128,7 +133,8 @@ for _pkgname in "${pkgname[@]}"; do
 	find-libprovides "$TEMPDIR/$oldpkg" 2>/dev/null | sort > "$TEMPDIR/libraries-$_pkgname-old"
 	find-libprovides "$pkgfile" 2>/dev/null | sort > "$TEMPDIR/libraries-$_pkgname"
 	if ! diff_output="$(sdiff -s "$TEMPDIR/libraries-$_pkgname-old" "$TEMPDIR/libraries-$_pkgname")"; then
-		msg "Sonames differ in $_pkgname!"
+		message="Sonames differ in $_pkgname!"
+		(( WARN )) && warning "$message" || msg "$message"
 		echo "$diff_output"
 	else
 		msg "No soname differences for %s." "$_pkgname"

doc/checkpkg.1.asciidoc

@@ -26,6 +26,9 @@ Options
 	Remove the temporary directory created to contain the file and library list
 	of both packages.
 
+*-w, --warn*::
+	Print a warning instead of a regular message in case of soname differences.
+
 *-h, --help*::
 	Show a help text
 

makechrootpkg.in

@@ -412,7 +412,7 @@ else
 		msg2 "Downloading current versions"
 		if pacman --noconfirm -Swdd --logfile /dev/null "${pkgnames[@]}"; then
 			msg2 "Checking packages"
-			sudo -u "$makepkg_user" checkpkg --rmdir
+			sudo -u "$makepkg_user" checkpkg --rmdir --warn
 		else
 			warning "Skipped checkpkg due to missing packages"
 		fi

zsh_completion.in

@@ -56,6 +56,7 @@ _rebuildpkgs_args=(
 
 _checkpkg_args=(
 	'(-r --rmdir)'{-r,--rmdir}'[Remove the temporary directory]'
+	'(-w --warn)'{-w,--warn}'[Print a warning in case of differences]'
 	'(-h --help)'{-h,--help}'[Display usage]'
 )