$ git clone -n https://src.fedoraproject.org/rpms/rust-oxipng.git /var/lib/mock/f40-build-798827-142036/root/chroot_tmpdir/scmroot/rust-oxipng
Cloning into '/var/lib/mock/f40-build-798827-142036/root/chroot_tmpdir/scmroot/rust-oxipng'...
$ git fetch origin 85cb8d944b636196c424a0773272754e9992745e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-oxipng
 * [new ref]         85cb8d944b636196c424a0773272754e9992745e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 85cb8d9 Add a man page