$ git clone -n https://src.fedoraproject.org/rpms/libtwin.git /var/lib/mock/f41-build-1037345-18787/root/chroot_tmpdir/scmroot/libtwin
Cloning into '/var/lib/mock/f41-build-1037345-18787/root/chroot_tmpdir/scmroot/libtwin'...
$ git fetch origin c52c2fd01738fded97747565565cd0ba5a2982b8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtwin
 * [new ref]         c52c2fd01738fded97747565565cd0ba5a2982b8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c52c2fd Eliminate use of obsolete %patchN syntax (#2283636)