$ git clone -n https://src.fedoraproject.org/rpms/perl-Mail-Transport-Dbx.git /var/lib/mock/f45-build-24653-605/root/chroot_tmpdir/scmroot/perl-Mail-Transport-Dbx
Cloning into '/var/lib/mock/f45-build-24653-605/root/chroot_tmpdir/scmroot/perl-Mail-Transport-Dbx'...
$ git fetch origin 4a1b488aa1847d6fab32fb1b6c93efdf56ab568e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Mail-Transport-Dbx
 * [new ref]         4a1b488aa1847d6fab32fb1b6c93efdf56ab568e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a1b488 Perl 5.44 rebuild