$ git clone -n https://src.fedoraproject.org/rpms/perl-DateTime-Format-RFC3339.git /var/lib/mock/f45-build-22956-595/root/chroot_tmpdir/scmroot/perl-DateTime-Format-RFC3339
Cloning into '/var/lib/mock/f45-build-22956-595/root/chroot_tmpdir/scmroot/perl-DateTime-Format-RFC3339'...
$ git fetch origin 50a88da01be10c25d7b6e6ff33add3a7e86381e3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-DateTime-Format-RFC3339
 * [new ref]         50a88da01be10c25d7b6e6ff33add3a7e86381e3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 50a88da Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild