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Go 1.13+: one shall not call flag.Parse() in init #309

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eclipseo opened this issue Jan 31, 2020 · 2 comments
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Go 1.13+: one shall not call flag.Parse() in init #309

eclipseo opened this issue Jan 31, 2020 · 2 comments

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@eclipseo
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eclipseo commented Jan 31, 2020 •
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See bug golang/go#33475 and bug golang/go#31859 for the rationale

To be clear, we are talking only about flag.Parse here, not flag.*. The flag package is designed so that multiple packages can define flags, without those packages being aware of each other. It's essential that flag.Parse be called only after all flags are defined, meaning only after all packages are initialized. The normal practice is that the main package calls flag.Parse, because the main package is the only package that is sure to run after all packages are initialized.

Your program may well be designed so that it is OK to call flag.Parse in an init function of some non-main package. But most programs do not and cannot work that way. So I am questioning how much we should twist the testing package to support that use case. Of course if the change to the testing package is simple, then that is fine. But I would not like to see a lot of complexity added to support a very unusual use case.
@eclipseo
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eclipseo commented Jan 31, 2020 •
edited

See golang/go#31859 (comment) for a workaround.

@dadrus dadrus mentioned this issue Mar 10, 2022
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phaus added a commit to inspired-consulting/martian that referenced this issue Mar 14, 2022
@phaus
moving flag.Parse() from init to main function(s) fixes google#309
a59a121
@phaus
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phaus commented Mar 14, 2022

I just pushed a small update, that helps using this module with go > 1.13.

phaus added a commit to inspired-consulting/go-replayers that referenced this issue Mar 14, 2022
@phaus
updating martian to fix #google/martian/issues/309
29abea4
jba added a commit to google/go-replayers that referenced this issue Mar 14, 2022
@jba
Merge pull request #16 from inspired-consulting/master
db4189c 
updating martian to fix #google/martian/issues/309
This was referenced Mar 15, 2022
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bramhaghosh pushed a commit that referenced this issue Aug 16, 2022
@phaus
refactoring to avoid flag definition clash (#336)
0f7e679 
* moving flag.Parse() from init to main function(s) fixes #309

* updating go to version 1.18, moving init code into main function

* updating go to version 1.18, moving init code into main function
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@phaus @eclipseo