scripts: protect against unintended glob matching in [[ ]] RHS

The right-hand side of the [[ ... = ... ]] keyword is an exception to
the general rule that quoting is unnecessary with [[

This is usually not a problem, e.g. in libmakepkg, lint_one_pkgname will
already fail if pkgname has an asterisk, but it certainly doesn't hurt
to be "more proper" and go with the spec; it is more dangerous in
repo-add, which can get caught in an infinite loop instead of safely
asserting there is no package named 'foo*'.

Reported-by: Rafael Ascensão <rafa.almas@gmail.com>
Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Allan McRae <allan@archlinux.org>

scripts/libmakepkg/lint_pkgbuild/checkdepends.sh.in

@@ -44,7 +44,7 @@ lint_checkdepends() {
 	for checkdepend in "${checkdepends_list[@]}"; do
 		name=${checkdepend%%@(<|>|=|>=|<=)*}
 		lint_one_pkgname checkdepends "$name" || ret=1
-		if [[ $name != $checkdepend ]]; then
+		if [[ $name != "$checkdepend" ]]; then
 			ver=${checkdepend##$name@(<|>|=|>=|<=)}
 			check_fullpkgver "$ver" checkdepends || ret=1
 		fi

scripts/libmakepkg/lint_pkgbuild/conflicts.sh.in

@@ -44,7 +44,7 @@ lint_conflicts() {
 	for conflict in "${conflicts_list[@]}"; do
 		name=${conflict%%@(<|>|=|>=|<=)*}
 		lint_one_pkgname conflicts "$name" || ret=1
-		if [[ $name != $conflict ]]; then
+		if [[ $name != "$conflict" ]]; then
 			ver=${conflict##$name@(<|>|=|>=|<=)}
 			check_fullpkgver "$ver" conflicts || ret=1
 		fi

scripts/libmakepkg/lint_pkgbuild/depends.sh.in

@@ -44,7 +44,7 @@ lint_depends() {
 	for depend in "${depends_list[@]}"; do
 		name=${depend%%@(<|>|=|>=|<=)*}
 		lint_one_pkgname depends "$name" || ret=1
-		if [[ $name != $depend ]]; then
+		if [[ $name != "$depend" ]]; then
 			ver=${depend##$name@(<|>|=|>=|<=)}
 			# Don't validate empty version because of https://bugs.archlinux.org/task/58776
 			if [[ -n $ver ]]; then

scripts/libmakepkg/lint_pkgbuild/makedepends.sh.in

@@ -44,7 +44,7 @@ lint_makedepends() {
 	for makedepend in "${makedepends_list[@]}"; do
 		name=${makedepend%%@(<|>|=|>=|<=)*}
 		lint_one_pkgname makedepends "$name" || ret=1
-		if [[ $name != $makedepend ]]; then
+		if [[ $name != "$makedepend" ]]; then
 			ver=${makedepend##$name@(<|>|=|>=|<=)}
 			check_fullpkgver "$ver" makedepends || ret=1
 		fi

scripts/libmakepkg/lint_pkgbuild/optdepends.sh.in

@@ -44,7 +44,7 @@ lint_optdepends() {
 	for optdepend in "${optdepends_list[@]%%:[[:space:]]*}"; do
 		name=${optdepend%%@(<|>|=|>=|<=)*}
 		lint_one_pkgname optdepends "$name" || ret=1
-		if [[ $name != $optdepend ]]; then
+		if [[ $name != "$optdepend" ]]; then
 			ver=${optdepend##$name@(<|>|=|>=|<=)}
 			check_fullpkgver "$ver" optdepends || ret=1
 		fi

scripts/libmakepkg/lint_pkgbuild/provides.sh.in

@@ -49,7 +49,7 @@ lint_provides() {
 		fi
 		name=${provide%=*}
 		lint_one_pkgname provides "$name" || ret=1
-		if [[ $name != $provide ]]; then
+		if [[ $name != "$provide" ]]; then
 			ver=${provide##$name=}
 			check_fullpkgver "$ver" provides || ret=1
 		fi

scripts/libmakepkg/source/git.sh.in

@@ -117,7 +117,7 @@ extract_git() {
 
 	if [[ ${fragment%%=*} = tag ]]; then
 		tagname="$(git tag -l --format='%(tag)' "$ref")"
-		if [[ -n $tagname && $tagname != $ref ]]; then
+		if [[ -n $tagname && $tagname != "$ref" ]]; then
 			error "$(gettext "Failure while checking out version %s, the git tag has been forged")" "$ref"
 			plain "$(gettext "Aborting...")"
 			exit 1

scripts/libmakepkg/tidy/zipman.sh.in

@@ -40,7 +40,7 @@ tidy_zipman() {
 			while read -r link ; do
 				if [[ "${file}" -ef "${link}" ]] ; then
 					rm -f "$link" "${link}.gz"
-					if [[ ${file%/*} = ${link%/*} ]]; then
+					if [[ ${file%/*} = "${link%/*}" ]]; then
 						ln -s -- "${file##*/}.gz" "${link}.gz"
 					else
 						ln -s -- "/${file}.gz" "${link}.gz"

scripts/pacman-db-upgrade.sh.in

@@ -182,7 +182,7 @@ if [[ -z "$db_version" ]]; then
 			realdir="$(resolve_dir "$dir")"
 
 			# verify realdir is inside root
-			if [[ ${realdir:0:${#pacroot}} != $pacroot ]]; then
+			if [[ ${realdir:0:${#pacroot}} != "$pacroot" ]]; then
 				warning "$(gettext "symlink '%s' points outside pacman root, manual repair required")" "$dir"
 				continue
 			fi

scripts/repo-add.sh.in

@@ -121,7 +121,7 @@ find_pkgentry() {
 
 	for pkgentry in "$tmpdir/db/$pkgname"*; do
 		name=${pkgentry##*/}
-		if [[ ${name%-*-*} = $pkgname ]]; then
+		if [[ ${name%-*-*} = "$pkgname" ]]; then
 			echo $pkgentry
 			return 0
 		fi