$ git clone -n https://src.fedoraproject.org/rpms/perl-Perl6-Caller.git /var/lib/mock/f45-build-25849-613/root/chroot_tmpdir/scmroot/perl-Perl6-Caller
Cloning into '/var/lib/mock/f45-build-25849-613/root/chroot_tmpdir/scmroot/perl-Perl6-Caller'...
$ git fetch origin 1ae6234dde2effd52532e397bbf8d78283aabe5e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Perl6-Caller
 * [new ref]         1ae6234dde2effd52532e397bbf8d78283aabe5e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 1ae6234 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild