$ git clone -n https://src.fedoraproject.org/rpms/log4j.git /var/lib/mock/f41-build-side-1-2867706-34209/root/chroot_tmpdir/scmroot/log4j
Cloning into '/var/lib/mock/f41-build-side-1-2867706-34209/root/chroot_tmpdir/scmroot/log4j'...
$ git fetch origin 9b2d65ce37a91d8870c07b1b44d2303623bd86a9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/log4j
 * [new ref]         9b2d65ce37a91d8870c07b1b44d2303623bd86a9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9b2d65c Switch javapackages tests to f41 branch