fix(build): allow unstable repositories to override repo target

This works around the fact that we are currently not auto detecting
unstable repository targets while providing a stability layer option on
the subcommand. Soften the --repo option rules by allowing unstable
repositories to use that flag for building and releasing against the
unstable repositories.

This will be replaced in the near future by proper integration of target
repository auto-detection that in aware of unstable repositories while
providing a unstable stability layer options.

Component: pkgctl build
Component: pkgctl release
Signed-off-by: Levente Polyak <anthraxx@archlinux.org>

src/lib/build/build.sh

@@ -337,7 +337,12 @@ pkgctl_build() {
 
 		# fail if an existing package specifies --repo
 		if [[ -n "${repo}" ]] && [[ -n ${pkgrepo} ]]; then
-			die 'Using --repo for packages that exist in official repositories is disallowed'
+			# allow unstable to use --repo
+			if [[ ${pkgrepo} == *unstable ]]; then
+				repo=${pkgrepo}
+			else
+				die 'Using --repo for packages that exist in official repositories is disallowed'
+			fi
 		fi
 
 		# assign auto-detected target repository

src/lib/release.sh

@@ -141,7 +141,12 @@ pkgctl_release() {
 
 		# fail if an existing package specifies --repo
 		if [[ -n "${repo}" ]] && [[ -n ${REPO} ]]; then
-			die 'Using --repo for packages that exist in official repositories is disallowed'
+			# allow unstable to use --repo
+			if [[ ${REPO} == *unstable ]]; then
+				repo=${REPO}
+			else
+				die 'Using --repo for packages that exist in official repositories is disallowed'
+			fi
 		fi
 
 		# fail if a new package does not specify --repo