$ git clone -n https://src.fedoraproject.org/rpms/resteasy.git /var/lib/mock/f40-build-2477444-61601/root/chroot_tmpdir/scmroot/resteasy
Cloning into '/var/lib/mock/f40-build-2477444-61601/root/chroot_tmpdir/scmroot/resteasy'...
$ git fetch origin 136ff7548284bf99314508e363a657b560ff1c6a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/resteasy
 * [new ref]         136ff7548284bf99314508e363a657b560ff1c6a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 136ff75 Add generic JPV test