$ git clone -n https://src.fedoraproject.org/rpms/rust-heck.git /var/lib/mock/f45-build-42315-792/root/chroot_tmpdir/scmroot/rust-heck
Cloning into '/var/lib/mock/f45-build-42315-792/root/chroot_tmpdir/scmroot/rust-heck'...
$ git fetch origin 63580393341d1d2490572412692018e5a596394c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-heck
 * [new ref]         63580393341d1d2490572412692018e5a596394c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6358039 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild