$ git clone -n https://src.fedoraproject.org/rpms/perl-Modern-Perl.git /var/lib/mock/f45-build-24832-606/root/chroot_tmpdir/scmroot/perl-Modern-Perl
Cloning into '/var/lib/mock/f45-build-24832-606/root/chroot_tmpdir/scmroot/perl-Modern-Perl'...
$ git fetch origin aa57dd61923e9a665c4be87cba73d8b4a89067bb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Modern-Perl
 * [new ref]         aa57dd61923e9a665c4be87cba73d8b4a89067bb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aa57dd6 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild