$ git clone -n https://src.fedoraproject.org/rpms/rust-cc.git /var/lib/mock/f45-build-40718-775/root/chroot_tmpdir/scmroot/rust-cc
Cloning into '/var/lib/mock/f45-build-40718-775/root/chroot_tmpdir/scmroot/rust-cc'...
$ git fetch origin acfd06973738f290179c60911c76e0448b917cef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cc
 * [new ref]         acfd06973738f290179c60911c76e0448b917cef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at acfd069 Allow shlex version 2