$ git clone -n https://src.fedoraproject.org/rpms/perl-RPM2.git /var/lib/mock/f41-build-816469-150205/root/chroot_tmpdir/scmroot/perl-RPM2
Cloning into '/var/lib/mock/f41-build-816469-150205/root/chroot_tmpdir/scmroot/perl-RPM2'...
$ git fetch origin 752a30ac9d54d8a0dc80229c3a9a4de94971aa21:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-RPM2
 * [new ref]         752a30ac9d54d8a0dc80229c3a9a4de94971aa21 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 752a30a Perl 5.40 rebuild