The permissions on /pub/mozilla.org/b2g/tinderbox-builds appear to be incorrect and/or being reset. Both user ffxbld & user b2gbld need write access to the directory I just manually set it to: drwxr-xr-x 7 ffxbld firefox 4096 Dec 6 03:31 nightly drwxrwxr-x 53 ffxbld b2gbld 4096 Dec 6 15:28 tinderbox-builds drwxr-xr-x 12 b2gtry b2gtry 4096 Sep 25 12:36 try-builds
See: http://hg.mozilla.org/build/puppet-manifests/file/a04b7a57a19f/stage/stagelayout.pp#l86 http://hg.mozilla.org/build/puppet-manifests/file/a04b7a57a19f/stage/stageusergroups.pp#l109 (if you need set group write bit in the directories)
I doubt we'll ever get to this. We probably need to replace dev-stage01 puppet manifests with something in PuppetAgain.