$ git clone -n https://src.fedoraproject.org/rpms/polarsys-b612-fonts.git /var/lib/mock/f39-build-1726530-41239/root/chroot_tmpdir/scmroot/polarsys-b612-fonts
Cloning into '/var/lib/mock/f39-build-1726530-41239/root/chroot_tmpdir/scmroot/polarsys-b612-fonts'...
$ git fetch origin c79ad62b51899d65f0e64cf2a11799d168493c24:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/polarsys-b612-fonts
 * [new ref]         c79ad62b51899d65f0e64cf2a11799d168493c24 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c79ad62 Convert to %autorelease and %autochangelog