$ git clone -n https://src.fedoraproject.org/rpms/perl-Convert-BinHex.git /var/lib/mock/f45-build-22567-593/root/chroot_tmpdir/scmroot/perl-Convert-BinHex
Cloning into '/var/lib/mock/f45-build-22567-593/root/chroot_tmpdir/scmroot/perl-Convert-BinHex'...
$ git fetch origin 08c03fc2f3141ec64b50eb2a9bc273f9fe81a905:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Convert-BinHex
 * [new ref]         08c03fc2f3141ec64b50eb2a9bc273f9fe81a905 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 08c03fc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild