$ git clone -n https://src.fedoraproject.org/rpms/libphonenumber.git /var/lib/mock/f40-build-2049673-49017/root/chroot_tmpdir/scmroot/libphonenumber
Cloning into '/var/lib/mock/f40-build-2049673-49017/root/chroot_tmpdir/scmroot/libphonenumber'...
$ git fetch origin 26029b8a9ec91085315d3a940735f81bbc0274aa:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libphonenumber
 * [new ref]         26029b8a9ec91085315d3a940735f81bbc0274aa -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 26029b8 We need to build it in the side tag