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nix: work around ziglang/zig#20976 and fix nix package builds

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Because Zig does not fetch recursive dependencies when you run `zig build
--fetch` (see https://github.com/ziglang/zig/issues/20976) we need to do some
extra work to fetch everything that we actually need to build without Internet
access (such as when building a Nix package).

An example of this happening:

```
error: builder for '/nix/store/cx8qcwrhjmjxik2547fw99v5j6np5san-ghostty-0.1.0.drv' failed with exit code 1;
      la/build/tmp.xgHOheUF7V/p/12208cfdda4d5fdbc81b0c44b82e4d6dba2d4a86bff644a153e026fdfc80f8469133/build.zig.zon:7:20: error: unable to discover remote git server capabilities: TemporaryNameServerFailure
      >             .url = "git+https://github.com/zigimg/zigimg#3a667bdb3d7f0955a5a51c8468eac83210c1439e",
      >                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      > /build/tmp.xgHOheUF7V/p/12208cfdda4d5fdbc81b0c44b82e4d6dba2d4a86bff644a153e026fdfc80f8469133/build.zig.zon:16:20: error: unable to discover remote git server capabilities: TemporaryNameServerFailure
      >             .url = "git+https://github.com/mitchellh/libxev#f6a672a78436d8efee1aa847a43a900ad773618b",
      >                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      >
      For full logs, run 'nix log /nix/store/cx8qcwrhjmjxik2547fw99v5j6np5san-ghostty-0.1.0.drv'.
```

To update this script, add any failing URLs with a line like this:

```
  zig fetch <url>
```

Periodically old URLs may need to be cleaned out.

Hopefully when the Zig issue is fixed this script can be eliminated in favor
of a plain `zig build --fetch`.
This commit is contained in:
Jeffrey C. Ollie
2024-09-27 15:49:02 -05:00
parent 2c2a765d66
commit 39733ac3e5
4 changed files with 57 additions and 6 deletions
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2
nix/zigCacheHash.nix
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@@ -1,3 +1,3 @@
# This file is auto-generated! check build-support/check-zig-cache-hash.sh for
# more details.
"sha256-qFt9sC3GekfU940Gd9oV9Gcbs5MdxVMojIMbkDo3m2A="
"sha256-JsAEfg1jp20aGz9YXG/QEp4MS5K5J5U7zFS2Orw2K/s="