$ git clone -n https://src.fedoraproject.org/rpms/log4j.git /var/lib/mock/f41-build-1702104-24562/root/chroot_tmpdir/scmroot/log4j
Cloning into '/var/lib/mock/f41-build-1702104-24562/root/chroot_tmpdir/scmroot/log4j'...
$ git fetch origin 0fb200fe149f1406f5b988c9882be464e346a869:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/log4j
 * [new ref]         0fb200fe149f1406f5b988c9882be464e346a869 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0fb200f Install license files in licensedir instead of docdir