$ git clone -n https://src.fedoraproject.org/rpms/pixman.git /var/lib/mock/f41-build-side-1-3085216-39083/root/chroot_tmpdir/scmroot/pixman
Cloning into '/var/lib/mock/f41-build-side-1-3085216-39083/root/chroot_tmpdir/scmroot/pixman'...
$ git fetch origin 1554f373f45c0e652a5e2a729df59937c7e84212:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/pixman
 * [new ref]         1554f373f45c0e652a5e2a729df59937c7e84212 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1554f37 Update to 0.44.0