$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime-Format-RFC3339.git /var/lib/mock/f40-build-2239086-53595/root/chroot_tmpdir/scmroot/perl-DateTime-Format-RFC3339
Cloning into '/var/lib/mock/f40-build-2239086-53595/root/chroot_tmpdir/scmroot/perl-DateTime-Format-RFC3339'...
$ git fetch origin 847c0decc86240256c9d40f3568bfebd1a17a942:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime-Format-RFC3339
 * [new ref]         847c0decc86240256c9d40f3568bfebd1a17a942 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 847c0de Update to 1.6.0 (RHBZ#2256485)