Retrieve action version

[averikitsch]

Describe the enhancement
Method or an environment variable to retrieve action version specified in workflow.

Code Snippet
workflow.yml:

steps:
    - uses: actions/my-action@v2

action code:

const version = core.actionVersion();
// OR
const version  = process.env.ACTION_VERSION

Additional information
This is useful when collecting usage statistics.

[thboop]

cc @TingluoHuang , I like this idea, what do you think about incorporating it into the Runner so that we can consume it?

Keep in mind that we support a number of different ways to specify what version of an action to download.

• SHA
• tag
• branch

Some of these are immutable (sha's), while others could change (branches or tags). Would it be helpful to expose two values, one that points to the version requested by the user, the other the sha it resolves to?

For example for the input

steps:
    - uses: actions/my-action@v2

we would provide

GITHUB_ACTION_VERSION = v2
GITHUB_ACTION_SHA = 7a1a0dd6fcb0fd35ec32d445689039886ad1a252

if a user requested by sha, they would get

steps:
    - uses: actions/my-action@7a1a0dd6fcb0fd35ec32d445689039886ad1a252

we would provide

GITHUB_ACTION_VERSION = 7a1a0dd6fcb0fd35ec32d445689039886ad1a252
GITHUB_ACTION_SHA = 7a1a0dd6fcb0fd35ec32d445689039886ad1a252

[gndelia]

I'd like to work on this one in the incoming days/weeks. Is it taken? 👀

[cristiangreco]

Hey 👋 would be super useful to access information about the ref of the action being executed. Any chance you guys are going to pick up this work? Thanks!

[gndelia]

I had no answer above, but I'll give it a try - in the worst scenario this ends up in a PR that's not merged 😄