zfilipin@deploy1001:~/release/make-wmf-branch$ ./make-wmf-branch -n 1.34.0-wmf.8 -o master
...
cd /tmp/make-wmf-branch
'git' 'clone' '-q' '--branch' 'master' '--depth' '1' 'https://gerrit.wikimedia.org/r/mediawiki/extensions/JADE' 'JADE'
cd JADE
'git' 'checkout' '-q' '-b' 'wmf/1.34.0-wmf.8'
'git' 'push' 'origin' 'wmf/1.34.0-wmf.8'
Total 0 (delta 0), reused 0 (delta 0)
remote: Processing changes: refs: 1, done
To ssh://gerrit.wikimedia.org:29418/mediawiki/extensions/JADE
 ! [remote rejected] wmf/1.34.0-wmf.8 -> wmf/1.34.0-wmf.8 (prohibited by Gerrit: project state does not permit write)
error: failed to push some refs to 'ssh://zfilipin@gerrit.wikimedia.org:29418/mediawiki/extensions/JADE'
sleeping for 5s
...