travis: use only repositories at same or higher level than target repo

.travis/build-pkgs

@@ -31,6 +31,24 @@ changed_abuilds() {
 	ap builddirs -d "$(pwd)/$repo" $aports 2>/dev/null | xargs -I% basename %
 }
 
+# Replaces /etc/apk/repositories with repositories at $MIRROR_URI that are on
+# the same or higher level than the given repo (main > community > testing)
+# and after that runs `apk update`.
+#
+# $1: the target repository; main, community, or testing
+set_repositories_for() {
+	local target_repo="$1"
+	local repos_file='/etc/apk/repositories'
+
+	printf '' > $repos_file
+	local repo; for repo in main community testing; do
+		printf '%s\n' "$MIRROR_URI/$repo" >> $repos_file
+		[ "$repo" = "$target_repo" ] && break
+	done
+
+	apk update
+}
+
 
 cd "$CLONE_DIR"
 
@@ -53,6 +71,8 @@ echo 'Diffstat:'
 git --no-pager diff --color --stat "$commit_range"
 
 for repo in $(changed_repos "$commit_range"); do
+	set_repositories_for "$repo"
+
 	for pkgname in $(changed_abuilds "$repo" "$commit_range"); do
 		qname="$repo/$pkgname"
 

.travis/common.sh

@@ -3,6 +3,7 @@
 readonly ALPINE_ROOT='/mnt/alpine'
 readonly ALPINE_USER='alpine'
 readonly CLONE_DIR="${CLONE_DIR:-$(pwd)}"
+readonly MIRROR_URI='http://dl-cdn.alpinelinux.org/alpine/edge'
 
 # Runs commands inside the Alpine chroot.
 alpine_run() {

.travis/install-alpine

@@ -21,8 +21,8 @@ title 'Installing Alpine Linux'
 mkdir -p "$ALPINE_ROOT"/etc/apk
 cd "$ALPINE_ROOT"
 
+echo "$MIRROR_URI/main" > etc/apk/repositories
 cp -R "$CLONE_DIR"/.travis/keys etc/apk/keys
-cp "$CLONE_DIR"/.travis/repositories etc/apk/repositories
 cp /etc/resolv.conf etc/resolv.conf
 
 /tmp/sbin/apk.static \

.travis/repositories

-http://dl-cdn.alpinelinux.org/alpine/edge/main
-http://dl-cdn.alpinelinux.org/alpine/edge/community
-http://dl-cdn.alpinelinux.org/alpine/edge/testing