$ git clone -n https://src.fedoraproject.org/rpms/backintime.git /var/lib/mock/f40-build-1777065-24802/root/chroot_tmpdir/scmroot/backintime
Cloning into '/var/lib/mock/f40-build-1777065-24802/root/chroot_tmpdir/scmroot/backintime'...
$ git fetch origin c2c466380651832998b55bf488cc181c742611f0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/backintime
 * [new ref]         c2c466380651832998b55bf488cc181c742611f0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c2c4663 Update to 1.5.1