support setting variables in a script

[asmacdo]

Variables cannot be set within a live script:

$ cat variables.sh

export SET_VAR="Please add support for variables"
echo $SET_VAR

$ doitlive play variables.sh

We'll do it live!
STARTING SESSION: Press Ctrl-C at any time to exit.
Press any key to continue ...

austin@dhcp129-212.rdu.redhat.com:devel $ export SET_VAR="Please add support for variables"
austin@dhcp129-212.rdu.redhat.com:devel $ echo $SET_VAR

austin@dhcp129-212.rdu.redhat.com:devel $ 
FINISHED SESSION

Just as a sanity check...
bash variables.sh

Please add support for variables

[sloria]

@asmacdo You can use #doitlive env: <VAR>=<value> as a workaround.

export NAME=Austin
#doitlive env: NAME=Austin
echo 'Hello' $NAME

Each command run in a session executes in its own environment, so export commands don't persist envvars to the next command. Use the above workaround for now.

Maybe doitlive should parse out export commands and save those variables automatically...

[sloria]

If I get some time this weekend, I'll see if I can make so that export commands work as expected. If you need it sooner, I'd definitely review/merge a PR. I think it's a matter of adding some logic here:

doitlive/doitlive/__init__.py

Line 570 in bcf2bff

elif shell_match:

Might be as simple as adding an elif command.startswith('export') and then calling state.add_envvar(command.split()[1]).