$ git clone -n https://src.fedoraproject.org/rpms/rust-regex-automata.git /var/lib/mock/f40-build-2643095-66480/root/chroot_tmpdir/scmroot/rust-regex-automata
Cloning into '/var/lib/mock/f40-build-2643095-66480/root/chroot_tmpdir/scmroot/rust-regex-automata'...
$ git fetch origin 1e5ae4f511604193a04d0996137f207de3157641:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-regex-automata
 * [new ref]         1e5ae4f511604193a04d0996137f207de3157641 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1e5ae4f Update to version 0.4.6; Fixes RHBZ#2267689