$ git clone -n https://src.fedoraproject.org/rpms/mate-desktop.git /var/lib/mock/f39-build-1520614-35831/root/chroot_tmpdir/scmroot/mate-desktop
Cloning into '/var/lib/mock/f39-build-1520614-35831/root/chroot_tmpdir/scmroot/mate-desktop'...
$ git fetch origin 707d23899aac2088ca974cc9a789d1cb4ac30f2d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-desktop
 * [new ref]         707d23899aac2088ca974cc9a789d1cb4ac30f2d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 707d238 update to 1.26.2