Changes the default fetcher in the Rust Platform to be the newer
`fetchCargoTarball`, and changes every application using the current default to
instead opt out.
This commit does not change any hashes or cause any rebuilds. Once integrated,
we will start deleting the opt-outs and recomputing hashes.
See #79975 for details.
The existing post-install was not successfully patching the git-gui script,
and thus was invoking the packaged osx app which uses the system tk,
which is too old to work (and is no longer supported by Apple anyway).
This has several advantages:
1. It takes up less space on disk in-between builds in the nix store.
2. It uses less space in the binary cache for vendor derivation packages.
3. It uses less network traffic downloading from the binary cache.
4. It plays nicely with hashed mirrors like tarballs.nixos.org, which only
substitute --flat hashes on single files (not recursive directory hashes).
5. It's consistent with how simple `fetchurl` src derivations work.
6. It provides a stronger abstraction between input src-package and output
package, e.g., it's harder to accidentally depend on the src derivation at
runtime by referencing something like `${src}/etc/index.html`. Likewise, in
the store it's harder to get confused with something that is just there as a
build-time dependency vs. a runtime dependency, since the build-time
src dependencies are tarred up.
Disadvantages are:
1. It takes slightly longer to untar at the start of a build.
As currently implemented, this attaches the compacted vendor.tar.gz feature as a
rider on `verifyCargoDeps`, since both of them are relatively newly implemented
behavior that change the `cargoSha256`.
If this PR is accepted, I will push forward the remaining rust packages with a
series of treewide PRs to update the `cargoSha256`s.
Git ships with a zsh completion script, but this script was previously
only available at $out/share/git/contrib/completion/git-completion.zsh,
which is not a path (or a filename) that would be discovered by a
typical zsh installation. This commit symlinks that file to
$out/share/zsh/site-functions/_git, which is a more standard location.
That zsh completion script is mostly a wrapper around the Bash
completion script, so this commit also patches the former so that it can
"find" the latter.
The old variant is still working but setting "cafile" is deprecated
since version 3.6 [0] and generates a warning:
DeprecationWarning: cafile, capath and cadefault are deprecated, use a custom context instead.
But without this patch "fetchRepoProject" still fails with
"error no host given" (see 337380ea1d).
[0]: https://docs.python.org/3.7/library/urllib.request.html#urllib.request.urlopen
