$ git clone -n https://src.fedoraproject.org/rpms/gimp.git /var/lib/mock/f42-build-868889-176316/root/chroot_tmpdir/scmroot/gimp
Cloning into '/var/lib/mock/f42-build-868889-176316/root/chroot_tmpdir/scmroot/gimp'...
$ git fetch origin 6852e01253f0b4296027566d452427c1a8578a14:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gimp
 * [new ref]         6852e01253f0b4296027566d452427c1a8578a14 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6852e01 Rebuild for jpegxl (libjxl) 0.11.1