$ git clone -n https://src.fedoraproject.org/rpms/rust-sha-1.git /var/lib/mock/f45-build-44888-818/root/chroot_tmpdir/scmroot/rust-sha-1
Cloning into '/var/lib/mock/f45-build-44888-818/root/chroot_tmpdir/scmroot/rust-sha-1'...
$ git fetch origin 7fdbe375efb099d9fcd2327f0ad44ff37438d31d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-sha-1
 * [new ref]         7fdbe375efb099d9fcd2327f0ad44ff37438d31d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7fdbe37 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild