$ git clone -n https://src.fedoraproject.org/rpms/rust-fdeflate.git /var/lib/mock/f38-build-side-42-init-devel-1396247-31050/root/chroot_tmpdir/scmroot/rust-fdeflate
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-1396247-31050/root/chroot_tmpdir/scmroot/rust-fdeflate'...
$ git fetch origin 21796e85e2ff0deccc8c5752dc7b98deb8ef2c00:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-fdeflate
 * [new ref]         21796e85e2ff0deccc8c5752dc7b98deb8ef2c00 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 21796e8 Initial import (#2223785)