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Use $PWD and --manifest-path to select a default package in workspaces #25

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merged 7 commits into from
Dec 8, 2022

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MarijnS95
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@MarijnS95 MarijnS95 commented Nov 25, 2022

Fixes rust-mobile/cargo-apk#8

This restores original, prevalent --manifest-path usage to select a package containing the APK crate in a [workspace], instead of using -p for that.

pub struct Workspace {
#[serde(default)]
pub default_members: Vec<String>,
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Should start using this too.

src/utils.rs Outdated Show resolved Hide resolved
@MarijnS95 MarijnS95 force-pushed the workspace-default-package branch 2 times, most recently from 3034a40 to 29f28ea Compare November 25, 2022 17:07
src/subcommand.rs Outdated Show resolved Hide resolved
@dvc94ch
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dvc94ch commented Dec 1, 2022

is libraryfication of cargo ever going to happen? I really whish we didn't have to rebuild these components

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is libraryfication of cargo ever going to happen? I really whish we didn't have to rebuild these components

No idea, would be cool.

Even cooler would be a plugin system, where cargo reads the manifest and only communicates meaningful chunks with us, instead of giving us a crate that contains their way of parsing the Cargo.toml, config.toml etc.

…paces

This restores original, prevalent `--manifest-path` usage to select a
package containing the APK crate in a `[workspace]`, instead of using
`-p` for that.
When calling `.parent()` on a filename the result is `""`, which should
be treated as PWD (`"."`) but `dunce::canonicalize()` ends up in a "No
such file or directory".
`.ancestors()` only calls `.parent()` on a `Path` which walks up until
the string empty, but this isn't the root of the filesystem if the path
wasn't absolute.
@MarijnS95 MarijnS95 marked this pull request as ready for review December 6, 2022 11:08
src/utils.rs Outdated
Comment on lines 103 to 113
// Find the closest member based on the given path
Ok(path
.ancestors()
// Move manifest out of the HashMap
.find_map(|dir| all_members.remove(dir))
.unwrap_or_else(|| {
(
workspace_manifest_path.to_owned(),
workspace_manifest.clone(),
)
}))
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This logic is slightly incomplete as it falls back to the package defined in the workspace (found in xbuild):

  • Even if it doesn't contain a [package] (leading to a panic in the outer function that expects this to have been checked already);
  • When there's a manifest along the way that isn't the workspace, but it is not part of it (this is a proper error in cargo).

I'll resolve these in xbuild first (where an identical setup to this PR has already been merged) and apply the same solution here afterwards.

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Fixed here too by replicating rust-mobile/xbuild#93!

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I'll probably merge this tonight and push out a new cargo-apk release.

The previous implementation had one fatal flaw: having a non-workspace
`Cargo.toml` in a subdirectory, with a `[workspace]` defined some
directories higher is invalid when that `[workspace]` doesn't include
the given `Cargo.toml` subdirectory/package.  `cargo` rejects this with
a `current package believes it's in a workspace when it's not`, and we
should do the same instead of having an `unwrap_or_else` that falls back
to using the workspace root `Cargo.toml` as a package (especially if it
might not contain a `[package]` at all).

This would for example fail when running `x new template` in the repo
directory, `cd`'ing into it and invoking `x build`.  Instead of
complaining about `template/Cargo.toml` not being part of the workspace,
it detects the workspace and falls back to building the root package
because the `template` directory appears to just be a subdirectory of
the root without defining a subpackage along it.  Since our root doesn't
define a `[package]`, the supposed-to-be-infallible `unwrap()` on
`manifest.package` below fails.
@MarijnS95 MarijnS95 merged commit 9ee82c9 into master Dec 8, 2022
@MarijnS95 MarijnS95 deleted the workspace-default-package branch December 8, 2022 20:51
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Restore --manifest-path (and $PWD) behaviour to select packages in a workspace
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