# no file created
INFO[06-22|11:52:07] containerFilePut bytes written           count=8 name=/tmp/lxd_forkputfile_190273725
INFO[06-22|11:52:07] FilePush                                 dstpath=/tmp/start mode=420 srcpath=/tmp/lxd_forkputfile_190273725 write=overwrite
INFO[06-22|11:52:07] FilePush forkputfile result              err=nil out="
forkdofile stderr rootfs=/var/lib/lxd/containers/algoruns-94ae-2f09217d29b2/rootfs pid=22796 source=/tmp/lxd_forkputfile_190273725 target=/tmp/start is_put=1 uid=0 gid=0 mode=420 defuid=0 defgid=0 defmode=416 append=0 manip_file_in_ns open host /tmp/lxd_forkputfile_190273725
manip_file_in_ns host fd=4
manip_file_in_ns attach_userns pid=22796
attach_userns pid=22796 source=user:[4026531837] target=user:[4026532282]
manip_file_in_ns open container /tmp/start
manip_file_in_ns dstfd=5
copy wrote 8 bytes
manip_file_in_ns copied=0
manip_file_in_ns done

# works
INFO[06-22|11:57:39] containerFilePut bytes written           count=105 name=/tmp/lxd_forkputfile_245670648
INFO[06-22|11:57:39] FilePush                                 dstpath=/tmp/lxc-copy mode=420 srcpath=/tmp/lxd_forkputfile_245670648 write=overwrite
INFO[06-22|11:57:39] FilePush forkputfile result              err=nil out="
forkdofile stderr rootfs=/var/lib/lxd/containers/algoruns-94ae-2f09217d29b2/rootfs pid=22796 source=/tmp/lxd_forkputfile_245670648 target=/tmp/lxc-copy is_put=1 uid=0 gid=0 mode=420 defuid=0 defgid=0 defmode=416 append=0
manip_file_in_ns open host /tmp/lxd_forkputfile_245670648
manip_file_in_ns host fd=4
manip_file_in_ns attach_userns pid=22796
attach_userns pid=22796 source=user:[4026531837] target=user:[4026532282]
manip_file_in_ns open container /tmp/lxc-copy
manip_file_in_ns dstfd=5
copy wrote 105 bytes
manip_file_in_ns copied=0
manip_file_in_ns done