$ git clone -n https://src.fedoraproject.org/rpms/perl-Perlbal-XS-HTTPHeaders.git /var/lib/mock/f45-build-25847-613/root/chroot_tmpdir/scmroot/perl-Perlbal-XS-HTTPHeaders
Cloning into '/var/lib/mock/f45-build-25847-613/root/chroot_tmpdir/scmroot/perl-Perlbal-XS-HTTPHeaders'...
$ git fetch origin 0fe5f7d154550c3df5f06b19242e52c4d33eac0b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Perlbal-XS-HTTPHeaders
 * [new ref]         0fe5f7d154550c3df5f06b19242e52c4d33eac0b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fe5f7d Perl 5.44 rebuild