python312Packages.pypdfium2: Fix incorrect hash

[sarahec]

Replaced incorrect hash for headers
Removed unneeded python import

Fixes #378154

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[GaetanLepage]

nixpkgs-review result

Generated using nixpkgs-review.

Command: nixpkgs-review pr 378156

---

x86_64-linux

❌ 4 packages failed to build:

• python312Packages.pypdfium2
• python312Packages.pypdfium2.dist
• python313Packages.pypdfium2
• python313Packages.pypdfium2.dist

---

aarch64-linux

❌ 4 packages failed to build:

• python312Packages.pypdfium2
• python312Packages.pypdfium2.dist
• python313Packages.pypdfium2
• python313Packages.pypdfium2.dist

---

x86_64-darwin

❌ 4 packages failed to build:

• python312Packages.pypdfium2
• python312Packages.pypdfium2.dist
• python313Packages.pypdfium2
• python313Packages.pypdfium2.dist

---

aarch64-darwin

❌ 4 packages failed to build:

• python312Packages.pypdfium2
• python312Packages.pypdfium2.dist
• python313Packages.pypdfium2
• python313Packages.pypdfium2.dist

[GaetanLepage]

┃ error: hash mismatch in fixed-output derivation '/nix/store/bzac5ysjadv6nhbl6g5m2f0lv2px8wvw-public.tar.gz.drv':
┃          specified: sha256-RJOhv9v/uI8jYh0hoM7FxGu2lcVV+7BjLkiZW0eX4hk=
┃             got:    sha256-SKnIF+Ib/S813AnIXMMSF0vdvrWcECcMO1JgbNLPs5Q=

[sarahec]

This is bizarre: I'm getting a different hash per platform for the same file.

[sarahec]

Closing this, and asking @booxter to please take a look. I suspect you'll need to vary the hash by platform as you do with the binaries.

[dotlambda]

This isn't even the hash obtained in #378154.

[sarahec]

I wrote #378154 using x86-Linux but was developing this PR on aarch64-darwin. (The linux box was busy running a nixpkgs-review.) It looks like the hash varies per platform.

[dotlambda]

The problem is that we're not fetching from a fixed commit. It has nothing to do with different platforms.

[sarahec]

The problem is that we're not fetching from a fixed commit. It has nothing to do with different platforms.

Good to know. I'm passing this back to the package maintainer.

[dotlambda]

What's the difference between this URL and https://pdfium.googlesource.com/pdfium/+archive/refs/heads/chromium/${pdfiumVersion}.tar.gz?

[dotlambda]

The problem is that we're not fetching from a fixed commit. It has nothing to do with different platforms.

Actually, that's probably not quite it. I assume that the archive is generated on the fly and contains some timestamp, thus the hashes obtained at different times are different. Use either fetchzip or fetchgit. Both of those recursively hash the content of the tarball rather than the file itself.

[sarahec]

OK, I know why he's using fetchurl -- the resulting file contains subfolders where fetchzip expects a flat folder.

[booxter]

I think the issue is that I erroneously refer to a branch, not a tag, so it can change. (I didn't realize that.) We will probably have to pin a particular revision.

[booxter]

Sent #378177 FYI