$ git clone -n https://src.fedoraproject.org/rpms/snip.git /var/lib/mock/f45-build-36191-702/root/chroot_tmpdir/scmroot/snip
Cloning into '/var/lib/mock/f45-build-36191-702/root/chroot_tmpdir/scmroot/snip'...
$ git fetch origin 77f4e4b842fe3c0c6227c0fcd357ce8a148dfcca:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/snip
 * [new ref]         77f4e4b842fe3c0c6227c0fcd357ce8a148dfcca -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 77f4e4b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild