$ git clone -n https://src.fedoraproject.org/rpms/perl-Perl6-Slurp.git /var/lib/mock/f45-build-25840-613/root/chroot_tmpdir/scmroot/perl-Perl6-Slurp
Cloning into '/var/lib/mock/f45-build-25840-613/root/chroot_tmpdir/scmroot/perl-Perl6-Slurp'...
$ git fetch origin ebf6e5d7084dc966ebabf1a6bc6d200ceb4890c6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Perl6-Slurp
 * [new ref]         ebf6e5d7084dc966ebabf1a6bc6d200ceb4890c6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ebf6e5d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild