$ git clone -n https://src.fedoraproject.org/rpms/perl-Devel-ArgNames.git /var/lib/mock/f45-build-23059-595/root/chroot_tmpdir/scmroot/perl-Devel-ArgNames
Cloning into '/var/lib/mock/f45-build-23059-595/root/chroot_tmpdir/scmroot/perl-Devel-ArgNames'...
$ git fetch origin 4072fdd0871be1fd2463d3f47a9a362fc3de9d2c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Devel-ArgNames
 * [new ref]         4072fdd0871be1fd2463d3f47a9a362fc3de9d2c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4072fdd Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild