Uses 'PAKET.VERSION' environment variable for bootstrap requests

[devboy]

When the environment variable PAKET.VERSION exists paket.bootstrap.exe will download that version when no argument is given:

~/Desktop env PAKET.VERSION=0.38.6 mono paket.bootstrapper.exe
Version 0.38.6 requested.
Paket.exe 0.38.6.0 is up to date.

When a version argument (or prerelease flag) is passed to paket.bootstrap.exe it will behave as always:

env PAKET.VERSION=0.38.6 mono paket.bootstrapper.exe 0.40.1
Version 0.40.1 requested.
Starting download from https://github.com/fsprojects/Paket/releases/download/0.40.1/paket.exe

This will simplify pinning the version of paket on local and CI environments. Especially for ProjectScaffold projects where you would have to edit multiple places in the build.cmd and build.sh files.

[forki]

could you please add a bit of documentation for this?
Thanks

[devboy]

Will do.
PAKET.VERSION as env variable is fine?
Or would you prefer something like PAKET.BOOTSTRAP.VERSION ?

[forki]

PAKET.VERSION is ok

[devboy]

Let me know if you think this is sufficient information.

[devboy]

Just noticed that this might not be expected bahviour:

$ env PAKET.VERSION=0.38.6 mono paket.bootstrapper.exe prerelease
Prerelease requested. Looking for latest prerelease.
Starting download from https://github.com/fsprojects/Paket/releases/download/0.38.6/paket.exe

[devboy]

Okay, when given prerelease option the env var is ignored. So everything will behave as it did previously and according to the documentation.

[forki]

cool. thanks.

[Stift]

Very nice idea. 👍