select.sh tools (python_select, gcc_select) should remember selected versions across upgrade

[macports_dharland@…]

Suppose that a user has installed python_select and used as follows

python_select python24

Currently, an upgrade to python_select will result in the users setting being forgotten. In fact since the post-destroot for python_select explicitly chooses python23-apple, /opt/local/bin/python will now point to a different executable/version than before the upgrade.

This isn't great and can cause python programs to crash for reasons that aren't that obvious to the user.

A suggested solution is for $TOOL_select to also write a symlink pointing to the selected option such as

/opt/local/etc/selected/python->/opt/local/etc/select/python/python24

Then upon activation $TOOL_select can be run passing the users previously selected version.

In addition a -s option could be provided to $TOOL_select to report the currently selected version.

[blb@…]

Attaching a patch which should accomplish this (remember which is selected, offer a switch to show what it is). Once done, the *_select ports will need to be updated to check for the existence of .current and if found, not run the select in the post-destroot phase.

[blb@…]

diff to select/select.sh

[raimue@…]

Committed the patch in r40609.

[raimue@…]

Released select 0.2 in r44661.

[anonymous]

Milestone Port Enhancements deleted