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execroot the trick and trap #31

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390be19
June
stagnation Dec 18, 2024
08becfb
execroot: the trick and trap
stagnation Dec 18, 2024
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2 changes: 1 addition & 1 deletion blog/2024-06-13-summer-buildbar.mdx
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Expand Up @@ -13,7 +13,7 @@ technical problems, new developments with Bazel and Buildbarn.

And also have a few beers.

Feel welcome to come over on Wednesday 19 June 2024, from 16 to 20.
Feel welcome to come over this Wednesday the nineteenth of June from 16 to 20.

## Directions

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10 changes: 10 additions & 0 deletions docs/tips/debug-bazel-go-projects.md
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Expand Up @@ -164,6 +164,16 @@ end | psub ) $BUILDOZER -- -h

## Execroot trick

:::info
Alternative title: Execroot trap

Hedron Vision notes a flaw with this technique for long-lived access to files,
with go-to-definition in the IDE being a great such use-case,
the Execroot is regenerated for new builds, and only contains the files needed for that build.
See https://github.com/hedronvision/bazel-compile-commands-extractor/blob/main/ImplementationReadme.md#compilation-working-directory-and-the-external-link
for how they access generated source files with a symlink of `external` itself.
:::

If the execution directory of the program does not matter
you can execute it directly from the _execroot_,
where all source files are available as they were during compilation in the sandbox.
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