build: put erofs output into a file and artifact it

.gitlab-ci.yml

@@ -34,6 +34,11 @@ imaging:
   after_script:
     # Upload all images to Harald. You can grab them at http://images.kde-linux.haraldsitter.eu/
     - ./upload-to-harald.sh || true
+  artifacts: &artifacts
+    expire_in: 4 weeks
+    when: always
+    paths:
+      - "**/erofs.log"
 
 imaging+publish:
   stage: start
@@ -55,3 +60,4 @@ imaging+publish:
   after_script:
     # Upload broken images to Harald for inspection
     - "[ $CI_JOB_STATUS == 'success' ] || ./upload-to-harald.sh || true"
+  artifacts: *artifacts

build.sh

@@ -163,7 +163,7 @@ cd .. # and back to root
 # Drop flatpak data from erofs. They are in the usr/share/factory and deployed from there.
 rm -rf "$OUTPUT/var/lib/flatpak"
 mkdir "$OUTPUT/var/lib/flatpak" # but keep a mountpoint around for the live session
-time mkfs.erofs -d0 -zzstd -C 65536 --chunksize 65536 -Efragments,ztailpacking "$ROOTFS_EROFS" "$OUTPUT" > /dev/null 2>&1
+time mkfs.erofs -d0 -zzstd -C 65536 --chunksize 65536 -Efragments,ztailpacking "$ROOTFS_EROFS" "$OUTPUT" > erofs.log 2>&1
 cp --reflink=auto "$ROOTFS_EROFS" kde-linux.cache/root.raw
 
 # Now assemble the two generated images using systemd-repart and the definitions in mkosi.repart into $IMG.