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[GH-ISSUE #1979] How close to GitHub is this, really? #946

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opened 2026-03-01 21:47:39 +03:00 by kerem · 3 comments

kerem commented

2026-03-01 21:47:39 +03:00

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Originally created by @dabrahams on GitHub (Aug 21, 2023).
Original GitHub issue: https://github.com/nektos/act/issues/1979

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Before trying to use act, I really want to know how much of its functionality depends on code GitHub provides, and how much is its authors' best attempt at reverse-engineering GitHub actions from their docs and black-box testing… or is there some alternative I've not considered? I can't find this information.

I actually think it should go in the README rather than the Wiki, FWIW.

Originally created by @dabrahams on GitHub (Aug 21, 2023). Original GitHub issue: https://github.com/nektos/act/issues/1979 ### Details Before trying to use act, I really want to know how much of its functionality depends on code GitHub provides, and how much is its authors' best attempt at reverse-engineering GitHub actions from their docs and black-box testing… or is there some alternative I've not considered? I can't find this information. I actually think it should go in the README rather than the Wiki, FWIW.

kerem

2026-03-01 21:47:39 +03:00

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kerem commented

2026-03-01 21:47:40 +03:00

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@ChristopherHX commented on GitHub (Aug 22, 2023):

how much of its functionality depends on code GitHub provides

I actually cannot answer that one, every code from GitHub have been at least translated from c# to golang and it is no longer the original.
It's far less than possible, but that could be caused by act beeing an older project than the official actions/runner.

how much is its authors' best attempt at reverse-engineering GitHub actions from their docs and black-box testing…

Very much, see here https://nektosact.com/not_supported.html for things missing. It is very possible to be a far too small list of missing functionality.

is there some alternative I've not considered?

Maybe my fork of actions/runner (it's very unknown compared to act), uses 80% (the whole actions/runner code or binary) of code GitHub provides.
I'm not going to link it here, due to conflict of interests with nektos/act.

@ChristopherHX commented on GitHub (Aug 22, 2023): > how much of its functionality depends on code GitHub provides I actually cannot answer that one, every code from GitHub have been at least translated from c# to golang and it is no longer the original. It's far less than possible, but that could be caused by act beeing an older project than the official actions/runner. > how much is its authors' best attempt at reverse-engineering GitHub actions from their docs and black-box testing… Very much, see here https://nektosact.com/not_supported.html for things missing. It is very possible to be a far too small list of missing functionality. > is there some alternative I've not considered? Maybe my fork of actions/runner (it's very unknown compared to act), uses 80% (the whole actions/runner code or binary) of code GitHub provides. I'm not going to link it here, due to conflict of interests with nektos/act.

kerem commented

2026-03-01 21:47:40 +03:00

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@GuessWhoSamFoo commented on GitHub (Aug 24, 2023):

https://github.com/aweris/gale is another alternative although it has a dependency on act.

@GuessWhoSamFoo commented on GitHub (Aug 24, 2023): https://github.com/aweris/gale is another alternative although it has a dependency on `act`.

kerem commented

2026-03-01 21:47:40 +03:00

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@github-actions[bot] commented on GitHub (Feb 21, 2024):

Issue is stale and will be closed in 14 days unless there is new activity

@github-actions[bot] commented on GitHub (Feb 21, 2024): Issue is stale and will be closed in 14 days unless there is new activity

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