$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-CBuilder.git /var/lib/mock/f41-build-815659-149668/root/chroot_tmpdir/scmroot/perl-ExtUtils-CBuilder
Cloning into '/var/lib/mock/f41-build-815659-149668/root/chroot_tmpdir/scmroot/perl-ExtUtils-CBuilder'...
$ git fetch origin dee79d225112236b692db90cb53d9d82abb1fe12:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-CBuilder
 * [new ref]         dee79d225112236b692db90cb53d9d82abb1fe12 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at dee79d2 Increase release to favour standalone package