Make "setup" command work for bash

[wdc]

Need to make setup command work for bash as part of migration to bash from tcsh. (Originally flagged by ghudson)

[wdc]

We worked through this topic at a recent Athena Release Team meeting.
Even if we taught setup how to operate with the default shell being bash,
it would involve fiddling with all lockers that use setup to use bash.

So we have to touch every locker that uses setup anyway.

We've agreed that, instead of making setup work with bash, to de-support setup.

[jdreed]

At a more recent release-team, we agreed to implement setup for bash, because Alex suggested that it's still useful for some 3partysw packages, and the work seems minimal.

We agreed that setup should run .attachrc.bash if it exists, otherwise it should inform the user that the locker is not configured to use setup under bash.

env_setup.bash and env_remove.bash are in /mit/jdreed/debathena/setup, along with a file called "bashrc" which contains the relevant snippets to add to /usr/athena/lib/init/bashrc.

Note that the "remove" function currently unsets SUBJECT afterwards, which it doesn't do under cshrc. This is a bug under cshrc, and the cshrc version should also "unsetenv SUBJECT" at the end of the alias, after sourcing env_remove.

Someone who is not me should test these and commit them.

[quentin]

You could trivially make this gracefully fallback to tcsh instead of breaking completely if there's no .attachrc.bash. If there's just an .attachrc, you could spawn a tcsh to run it in, probably with a warning to the user "WARNING: This locker does not support the bash shell. This shell has temporarily been switch to tcsh."

[jdreed]

I believe we decided that spawning a new xterm with a shell is confusing, and even more confusing when from the command line.

The onus is on locker maintainers to create .attachrc.bash as part of their locker maintenance. .attachrc scripts tend to bitrot very quickly and probably have a lot of hacks in them that pertain to things like Athena 8 and are useless.

[quentin]

It may be confusing, but it's already the behavior that setup has when run under X. I'm not sure what it does under not-X, but I suspect that it also spawns a new shell there.

[jdreed]

I will compile a list of course and sw lockers which use .attachrc and will send mail to locker maintainers once this is deployed. I'm actually going to bump this to Summer milestone, so that we can send mail before term starts.

[broder]

Uploaded to -proposed. Testing would be appreciated.

[broder]

Whoops - forgot to update the debian/debathena-dotfiles.install file. Let's give this a few more days in proposed - I'll plan to move it on Wednesday.

[broder]

The new setup does seem to work in bash.

[broder]

Fixed