portindex should be atomic

[ryandesign@…]

The portindex script should work atomically -- it should replace the old PortIndex file with the new one in a single step. Currently portindex clears the PortIndex and starts rebuilding it. This means that while the portindex script is running, you really can't use MacPorts (for example to install other ports) because the PortIndex is incomplete until the script finishes. portindex should rebuild the PortIndex in a temporary file, and only move the temporary file over the real PortIndex once it's completely done.

I initially  brought this up on macports-dev.

[blb@…]

diff to base/src/port/portindex.tcl

[blb@…]

Simple patch attached; rename the PortIndex.regen if a better name (or safe temp-naming) is desired.

[ryandesign@…]

Let's use mktemp to make the temporary file in the tmp directory.

[ryandesign@…]

Fixed in r41701.

[ryandesign@…]

Updated ChangeLog in r41702.