$ git clone -n https://src.fedoraproject.org/rpms/xmake.git /var/lib/mock/f45-build-38937-730/root/chroot_tmpdir/scmroot/xmake
Cloning into '/var/lib/mock/f45-build-38937-730/root/chroot_tmpdir/scmroot/xmake'...
$ git fetch origin 15a0e7c66476c764e76feef71abf1bb679ffb628:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xmake
 * [new ref]         15a0e7c66476c764e76feef71abf1bb679ffb628 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15a0e7c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild