$ git clone -n https://src.fedoraproject.org/rpms/perl-Convert-Binary-C.git /var/lib/mock/f45-build-22568-593/root/chroot_tmpdir/scmroot/perl-Convert-Binary-C
Cloning into '/var/lib/mock/f45-build-22568-593/root/chroot_tmpdir/scmroot/perl-Convert-Binary-C'...
$ git fetch origin 03721b0c0a2f85fce7b3295a3a0f02c5040de424:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Convert-Binary-C
 * [new ref]         03721b0c0a2f85fce7b3295a3a0f02c5040de424 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 03721b0 Perl 5.44 rebuild