$ git clone -n https://src.fedoraproject.org/rpms/perl-Lucy.git /var/lib/mock/f41-build-816792-150408/root/chroot_tmpdir/scmroot/perl-Lucy
Cloning into '/var/lib/mock/f41-build-816792-150408/root/chroot_tmpdir/scmroot/perl-Lucy'...
$ git fetch origin 9f9d9196a09a9da6f67ad631983ca1a63003555c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Lucy
 * [new ref]         9f9d9196a09a9da6f67ad631983ca1a63003555c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9f9d919 Perl 5.40 rebuild