$ git clone -n https://src.fedoraproject.org/rpms/perl-Lexical-Var.git /var/lib/mock/f45-build-24396-603/root/chroot_tmpdir/scmroot/perl-Lexical-Var
Cloning into '/var/lib/mock/f45-build-24396-603/root/chroot_tmpdir/scmroot/perl-Lexical-Var'...
$ git fetch origin 4c08c338bd1ce02aa63370a43eb06666ceee0d8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Lexical-Var
 * [new ref]         4c08c338bd1ce02aa63370a43eb06666ceee0d8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4c08c33 Perl 5.44 rebuild