$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-Carp.git /var/lib/mock/f45-build-26563-618/root/chroot_tmpdir/scmroot/perl-Test-Carp
Cloning into '/var/lib/mock/f45-build-26563-618/root/chroot_tmpdir/scmroot/perl-Test-Carp'...
$ git fetch origin dd5e42730615ea7c777f7587fb54b70110dd2bc1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-Carp
 * [new ref]         dd5e42730615ea7c777f7587fb54b70110dd2bc1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dd5e427 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild