$SIMDEM_TEMP_DIR and SIMDEM_VERSION not set in SimDem2

[SorraTheOrc]

In SimDem1 we provided default SIMDEM_TEMP_DIR environment variable, this is used as a workspace when SimDem or a SimDem script needs to write some temporary files. By default it is set to [.simdem/tmp](https://github.com/Azure/simdem/blob/6dbce90c0bfbd980e35cdc3c92edd28e1e612ffe/config.py#L2)

Similarly we set SIMDEM_VERSION for easy validation of the version against expected versions during testing. This could be replaced by a --version switch in the CLI.

SimDem2 does not provide either of these and so the test scripts for SimDem1 fail:

$ ~/.local/bin/simdem --mode test README.md
$ ls $SIMDEM_TEMP_DIR/test
ls: cannot access '/test': No such file or directory

***PREREQUISITE VALIDATION FAILED***
$ touch $SIMDEM_TEMP_DIR/test/nested_prereq_ran
touch: cannot touch '/test/nested_prereq_ran': No such file or directory

$ ls $SIMDEM_TEMP_DIR/test
ls: cannot access '/test': No such file or directory

***PREREQUISITE VALIDATION FAILED***
$ touch $SIMDEM_TEMP_DIR/test/prereq_ran
touch: cannot touch '/test/prereq_ran': No such file or directory

$ ls $SIMDEM_TEMP_DIR/test
ls: cannot access '/test': No such file or directory

***PREREQUISITE VALIDATION FAILED***
$ touch $SIMDEM_TEMP_DIR/test/nested_prereq_ran
touch: cannot touch '/test/nested_prereq_ran': No such file or directory

$ ls $SIMDEM_TEMP_DIR/test
ls: cannot access '/test': No such file or directory

***PREREQUISITE VALIDATION FAILED***
$ touch $SIMDEM_TEMP_DIR/test/prereq_ran
touch: cannot touch '/test/prereq_ran': No such file or directory

$ echo $SIMDEM_VERSION


*** SIMDEM TEST RESULT FAILED ***

[lastcoolnameleft]

I've added --version flag in this commit: c364431

➜  simdem git:(simdem2) simdem --version
simdem 0.9.0

Does this meet the $SIMDEM_VERSION requirement, or did you still want the env variable injected?

[SorraTheOrc]

To be honest I can't for the life of me remember why there is an environment variable for VERSION, so I guess that means we can drop it.

The TEMP_DIR is important though, many of the scripts already out there use it. Happy for this to simply be a default that can be overridden with the '-e' argument. I keep dreaming of a .simdem/config file to configure these kinds of things but we should not block on that.

[lastcoolnameleft]

Regarding the directory location, it's easy to put into the config file (which is overridable); however, the key part is what is it relative to?

• The user's home directory?
  • My preference because it would be consistent across runs
• Where the CLI was run?
  • This could break with a "Next Step" in a different directory.
• Where the current script is run?
  • This could break with a "Next Step" in a different directory.

[SorraTheOrc]

Current implementation is relative to home Get Outlook for Android<https://aka.ms/ghei36>

…

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[lastcoolnameleft]

This is now implemented to use the value here: https://github.com/Azure/simdem/blob/simdem2/simdem/simdem.ini#L5

[SorraTheOrc]

The variable name is defined as "temp_dir" rather than "SIMDEM_TEMP_DIR". Is there a reason for this? I'd much rather we stay backward compatible because:

• no changes to existing scripts (including tests)
• the "SIMDEM" prefix makes it possible to have a setting in the environment without interfering with other applications
• it's convention for environment variables to be all upper case

[lastcoolnameleft]

"temp_dir" is what it's called inside the simdem.ini file it gets mapped to SIMDEM_TEMP_DIR inside the coe. I can change the name if you want me to, but I figured it would be useful to keep it consistent to *.ini settings.

Here is where it's set to SIMDEM_TEMP_DIR:
https://github.com/Azure/simdem/blob/simdem2/simdem/mode/common.py#L138

[SorraTheOrc]

Ahhh.. OK. That's confusing, but it's only a documentation thing.