$ git clone -n https://src.fedoraproject.org/rpms/libtiff.git /var/lib/mock/f41-build-729208-13151/root/chroot_tmpdir/scmroot/libtiff
Cloning into '/var/lib/mock/f41-build-729208-13151/root/chroot_tmpdir/scmroot/libtiff'...
$ git fetch origin 15510cf2a1ad7c901c6d7edc6ea10f71a478fe96:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libtiff
 * [new ref]         15510cf2a1ad7c901c6d7edc6ea10f71a478fe96 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 15510cf Eliminate use of obsolete %patchN syntax (#2283636)