$ git clone -n https://src.fedoraproject.org/rpms/glibc.git /var/lib/mock/f41-build-861197-169515/root/chroot_tmpdir/scmroot/glibc
Cloning into '/var/lib/mock/f41-build-861197-169515/root/chroot_tmpdir/scmroot/glibc'...
$ git fetch origin 09d5f43217946182d1447e1f9d9b1f9c1ea4ba44:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/glibc
 * [new ref]         09d5f43217946182d1447e1f9d9b1f9c1ea4ba44 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 09d5f43 Use rpm.spawn instead of posix.fork if availabe (#2291869)