[Fab-user] doc/samples: question on rollback method

[Carsten Kraus]

Hi folks,

am new to fabric and to Linux in general. 

I´m working with the sample provided in /doc/samples as of commit cc336b5a8210e6b34082aeebef113b6e8d4431eb. (How do U reference git 'revisions' btw? : )

In the sample´s rollback() there is sth like:

sudo(

        "export PREV=$(ls -1 %(someProjectVar)s|tail -1);" +

...

)

..which sets the var $PREV for later use.

However, for me this isnt working - on my box(Ubuntu 8.04 Desktop) the var $PREV will just be empty.

I even tried

run(        

        "export FOO='bar';" + 

        "echo $FOO;"

)

This will also result in an empty 'out:' when I run it from fab - when I run this being logged in on the target machine with the same user, it´s working fine.

Is there an alternative, how I could store eg. the most recent foldername in a var for rolling back purposes?

Apologies, if this is off-topic & thx for any pointer!!

Carsten