$ git clone -n https://src.fedoraproject.org/rpms/rust-gix-archive.git /var/lib/mock/f45-build-41907-786/root/chroot_tmpdir/scmroot/rust-gix-archive
Cloning into '/var/lib/mock/f45-build-41907-786/root/chroot_tmpdir/scmroot/rust-gix-archive'...
$ git fetch origin 851687165ba5756a83a9466d1feb85f4921129b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gix-archive
 * [new ref]         851687165ba5756a83a9466d1feb85f4921129b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8516871 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild