$ git clone -n https://src.fedoraproject.org/rpms/prelockd.git /var/lib/mock/f41-build-708998-13013/root/chroot_tmpdir/scmroot/prelockd
Cloning into '/var/lib/mock/f41-build-708998-13013/root/chroot_tmpdir/scmroot/prelockd'...
$ git fetch origin 19b0386fa77297609b79cd899650cbc8f131f5fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/prelockd
 * [new ref]         19b0386fa77297609b79cd899650cbc8f131f5fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 19b0386 Hostile upstream