$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f40-build-2226661-52941/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f40-build-2226661-52941/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin d6f60005eb62ac0f1614e96f76281f719b214ba8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         d6f60005eb62ac0f1614e96f76281f719b214ba8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
Updating files:  39% (175/447)
Updating files:  40% (179/447)
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Updating files: 100% (447/447)
Updating files: 100% (447/447), done.
HEAD is now at d6f6000 Infinite loop in res_mkquery with malformed domain name (#2255506)