$ git clone -n https://src.fedoraproject.org/rpms/rust-autocfg.git /var/lib/mock/f45-build-40356-771/root/chroot_tmpdir/scmroot/rust-autocfg
Cloning into '/var/lib/mock/f45-build-40356-771/root/chroot_tmpdir/scmroot/rust-autocfg'...
$ git fetch origin 769e21727757670ac0f6be70e727acd90e6b6c92:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-autocfg
 * [new ref]         769e21727757670ac0f6be70e727acd90e6b6c92 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 769e217 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild