$ git clone -n https://src.fedoraproject.org/rpms/s3cmd.git /var/lib/mock/f42-build-side-1-3583198-46888/root/chroot_tmpdir/scmroot/s3cmd
Cloning into '/var/lib/mock/f42-build-side-1-3583198-46888/root/chroot_tmpdir/scmroot/s3cmd'...
$ git fetch origin ffc1d96d0c4ff2ecfe1c1ec32e786b15c4a36a94:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/s3cmd
 * [new ref]         ffc1d96d0c4ff2ecfe1c1ec32e786b15c4a36a94 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ffc1d96 Fix for python3-magic/python3-file-magic requirement issue (BZ2375030)