Overzealous warnings about running without root privileges

[ryandesign (Ryan Carsten Schmidt)]

MacPorts 1.8.0 prints too many warnings when running without root privileges:

$ port install zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Computing dependencies for zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Fetching zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Verifying checksum(s) for zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Extracting zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Applying patches to zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Configuring zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Building zlib
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Staging zlib into destroot
MacPorts running without privileges. You may be unable to complete certain actions (eg install).
--->  Installing zlib @1.2.3_2
Error: Target org.macports.install returned: could not set attributes of "/mp/var/macports/software/zlib/1.2.3_2/mp/share/man/man3/zlib.3.gz": permission denied
Error: Status 1 encountered during processing.
$

Ignoring for a moment the permission error in the install phase, which is filed as #20887, MacPorts has warned about running "without privileges" before every phase. I would like to see a maximum of one such warning per port, or perhaps just one warning per invocation of the port command, or perhaps even no warning at all. I run my MacPorts prefix under my own username and do not use root privileges unless installing something that needs them, for example when installing a port that has a launchd plist.

[jmroot (Joshua Root)]

r59833