$ git clone -n https://src.fedoraproject.org/rpms/rust-hamcrest2.git /var/lib/mock/f45-build-42304-792/root/chroot_tmpdir/scmroot/rust-hamcrest2
Cloning into '/var/lib/mock/f45-build-42304-792/root/chroot_tmpdir/scmroot/rust-hamcrest2'...
$ git fetch origin d61588a355581a942a201b4d13e40c58799d08fd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-hamcrest2
 * [new ref]         d61588a355581a942a201b4d13e40c58799d08fd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d61588a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild