$ git clone -n https://src.fedoraproject.org/rpms/srt.git /var/lib/mock/f41-build-side-1-2907855-34729/root/chroot_tmpdir/scmroot/srt
Cloning into '/var/lib/mock/f41-build-side-1-2907855-34729/root/chroot_tmpdir/scmroot/srt'...
$ git fetch origin 48bfe3220b4a2db8e497d79986894aa8b2453349:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/srt
 * [new ref]         48bfe3220b4a2db8e497d79986894aa8b2453349 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 48bfe32 Update to 1.5.4-rc0