$ git clone -n https://src.fedoraproject.org/rpms/chmlib.git /var/lib/mock/f41-build-875106-16267/root/chroot_tmpdir/scmroot/chmlib
Cloning into '/var/lib/mock/f41-build-875106-16267/root/chroot_tmpdir/scmroot/chmlib'...
$ git fetch origin 91ea8d5539a7e46aadf1e159cbde1bb1397f0f29:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/chmlib
 * [new ref]         91ea8d5539a7e46aadf1e159cbde1bb1397f0f29 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 91ea8d5 Eliminate use of obsolete %patchN syntax (#2283636)