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parallel: fix calculation of max line length #101472

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merged 1 commit into from Oct 24, 2020

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@bjornfor
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@bjornfor bjornfor commented Oct 23, 2020

Motivation for this change

parallel >= 20200822 uses /bin/echo to calculate the max allowed line
length. Patch it to a correct path, so that it doesn't (silently) fail
and fall back to a low value of 324.

Before:
$ parallel --max-line-length-allowed
324

After:
$ parallel --max-line-length-allowed
131063

Fixes: 16ca872 ("parallel: 20200722 -> 20200822")

Things done
  • Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
  • Built on platform(s)
    • NixOS
    • macOS
    • other Linux distributions
  • Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
  • Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
  • Tested execution of all binary files (usually in ./result/bin/)
  • Determined the impact on package closure size (by running nix path-info -S before and after)
  • Ensured that relevant documentation is up to date
  • Fits CONTRIBUTING.md.
parallel >= 20200822 uses /bin/echo to calculate the max allowed line
length. Patch it to a correct path, so that it doesn't (silently) fail
and fall back to a low value of 324.

Before:
  $ parallel --max-line-length-allowed
  324

After:
  $ parallel --max-line-length-allowed
  131063

Fixes: 16ca872 ("parallel: 20200722 -> 20200822")
@ajs124
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@ajs124 ajs124 commented Oct 23, 2020

This could probably be a replace without a patch, but I can confirm that I've run into this, as well.

@bjornfor
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@bjornfor bjornfor commented Oct 23, 2020

Rationale: I chose to use a patch so that when this file changes in the future we are more likely to get a build error than runtime error.

@bjornfor
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@bjornfor bjornfor commented Oct 23, 2020

I sent an email about this to bug-parallel@gnu.org.

@bjornfor
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@bjornfor bjornfor commented Oct 23, 2020

Oh, and there are multiple hits for "/bin/echo" in the code base, but the remaining ones are only in the test suite. I guess we could mass-replace "/bin/echo", but I'm not feeling like it.

@tomberek
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@tomberek tomberek commented Oct 23, 2020

Result of nixpkgs-review pr 101472 1

9 packages built:
  • adapta-gtk-theme
  • image_optim
  • jpeg-archive
  • last
  • parallel
  • parallel-full
  • plata-theme
  • profile-cleaner
  • tebreak

@bjornfor bjornfor merged commit 3d4e133 into NixOS:master Oct 24, 2020
19 checks passed
@bjornfor
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@bjornfor bjornfor commented Oct 24, 2020

Thanks, @tomberek!

@bjornfor bjornfor deleted the parallel-fix-max-line-length branch Oct 24, 2020
@bjornfor
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@bjornfor bjornfor commented Oct 24, 2020

I ran nixpkgs-review on release-20.09 (success) and backported in 95d26c9.

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3 participants