$ git clone -n https://src.fedoraproject.org/rpms/rust-docmatic.git /var/lib/mock/f45-build-41419-782/root/chroot_tmpdir/scmroot/rust-docmatic
Cloning into '/var/lib/mock/f45-build-41419-782/root/chroot_tmpdir/scmroot/rust-docmatic'...
$ git fetch origin 92dfd8bbf7bc54b1624774cd7024c2b6cd081e4a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-docmatic
 * [new ref]         92dfd8bbf7bc54b1624774cd7024c2b6cd081e4a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 92dfd8b Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild