$ git clone -n https://src.fedoraproject.org/rpms/rust-phc.git /var/lib/mock/f45-build-43822-807/root/chroot_tmpdir/scmroot/rust-phc
Cloning into '/var/lib/mock/f45-build-43822-807/root/chroot_tmpdir/scmroot/rust-phc'...
$ git fetch origin bb047d08c2a5c37b4d1866edd08bfe431ecf69a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-phc
 * [new ref]         bb047d08c2a5c37b4d1866edd08bfe431ecf69a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bb047d0 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild