$ git clone -n https://src.fedoraproject.org/rpms/guile.git /var/lib/mock/f41-build-703962-12985/root/chroot_tmpdir/scmroot/guile
Cloning into '/var/lib/mock/f41-build-703962-12985/root/chroot_tmpdir/scmroot/guile'...
$ git fetch origin cc8e6cdfa58c4de78e065fa3b6e02b28750a65dd:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/guile
 * [new ref]         cc8e6cdfa58c4de78e065fa3b6e02b28750a65dd -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cc8e6cd Eliminate use of obsolete %patchN syntax (#2283636)