$ git clone -n https://src.fedoraproject.org/rpms/compat-flex.git /var/lib/mock/f41-build-830522-14807/root/chroot_tmpdir/scmroot/compat-flex
Cloning into '/var/lib/mock/f41-build-830522-14807/root/chroot_tmpdir/scmroot/compat-flex'...
$ git fetch origin e6de67c03af37af2fe999c95782a69db9473d855:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/compat-flex
 * [new ref]         e6de67c03af37af2fe999c95782a69db9473d855 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e6de67c Eliminate use of obsolete %patchN syntax (#2283636)