$ git clone -n https://src.fedoraproject.org/rpms/perl-srpm-macros.git /var/lib/mock/f41-build-816862-150472/root/chroot_tmpdir/scmroot/perl-srpm-macros
Cloning into '/var/lib/mock/f41-build-816862-150472/root/chroot_tmpdir/scmroot/perl-srpm-macros'...
$ git fetch origin 43d9441b59a2c2f60ea7bdce8f8a9fe2c3b27007:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-srpm-macros
 * [new ref]         43d9441b59a2c2f60ea7bdce8f8a9fe2c3b27007 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 43d9441 Disable perl_bootstrap for perl 5.40 rebuild