Solaris 11 has GNU stat (handled by *)
Solaris 10 (and older?) does not have stat (handled by failing command -v stat)
On Solaris 10 (at least on UFS), setgid cannot be set on directories.
Unlike on other systems `chmod 2400` is not `-r----S---`, but `-r----l---`.
Some embedded systems (like OpenWrt) do not ship a stat(1) binary.
This workaround parses the output of ls(1) and /etc/passwd, /etc/group to
gather the information needed.
- upload file in a safer way
- remove destination if it is not a file
- only set attributes if required
Signed-off-by: Steven Armstrong <steven@icarus.ethz.ch>