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Re-implement SDK discovery instead of using xcrun
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| use std::fs; | ||
| use std::io::ErrorKind; | ||
| use std::path::{Path, PathBuf}; | ||
|
|
||
| use crate::errors::AppleSdkError; | ||
|
|
||
| #[cfg(test)] | ||
| mod tests; | ||
|
|
||
| // TOCTOU is not _really_ an issue with our use of `try_exists` in here, we mostly use it for | ||
| // diagnostics, and these directories are global state that the user may change anytime anyhow. | ||
| fn try_exists(path: &Path) -> Result<bool, AppleSdkError> { | ||
| path.try_exists().map_err(|error| AppleSdkError::FailedReading { path: path.to_owned(), error }) | ||
| } | ||
|
|
||
| /// Get the SDK path for an SDK under `/Library/Developer/CommandLineTools`. | ||
| fn sdk_root_in_sdks_dir(sdks_dir: impl Into<PathBuf>, sdk_name: &str) -> PathBuf { | ||
| let mut path = sdks_dir.into(); | ||
| path.push("SDKs"); | ||
| path.push(sdk_name); | ||
| path.set_extension("sdk"); | ||
| path | ||
| } | ||
|
|
||
| /// Get the SDK path for an SDK under `/Applications/Xcode.app/Contents/Developer`. | ||
| fn sdk_root_in_developer_dir(developer_dir: impl Into<PathBuf>, sdk_name: &str) -> PathBuf { | ||
| let mut path = developer_dir.into(); | ||
| path.push("Platforms"); | ||
| path.push(sdk_name); | ||
| path.set_extension("platform"); | ||
| path.push("Developer"); | ||
| path.push("SDKs"); | ||
| path.push(sdk_name); | ||
| path.set_extension("sdk"); | ||
| path | ||
| } | ||
|
|
||
| /// Find a SDK root from the user's environment for the given SDK name. | ||
| /// | ||
| /// We do this by searching (purely by names in the filesystem, without reading SDKSettings.json) | ||
| /// for a matching SDK in the following places: | ||
| /// - `DEVELOPER_DIR` | ||
| /// - `/var/db/xcode_select_link` | ||
| /// - `/Applications/Xcode.app` | ||
| /// - `/Library/Developer/CommandLineTools` | ||
| /// | ||
| /// This does roughly the same thing as `xcrun -sdk $sdk_name -show-sdk-path` (see `man xcrun` for | ||
| /// a few details on the search algorithm). | ||
| /// | ||
| /// The reason why we implement this logic ourselves is: | ||
| /// - Reading these directly is faster than spawning a new process. | ||
| /// - `xcrun` can be fairly slow to start up after a reboot. | ||
| /// - In the future, we will be able to integrate this better with the compiler's change tracking | ||
| /// mechanisms, allowing rebuilds when the involved env vars and paths here change. See #118204. | ||
| /// - It's easier for us to emit better error messages. | ||
| /// | ||
| /// Though a downside is that `xcrun` might be expanded in the future to check more places, and then | ||
| /// `rustc` would have to be changed to keep up. Furthermore, `xcrun`'s exact algorithm is | ||
| /// undocumented, so it might be doing more things than we do here. | ||
| pub(crate) fn find_sdk_root(sdk_name: &'static str) -> Result<PathBuf, AppleSdkError> { | ||
| // Only try this if host OS is macOS. | ||
| if !cfg!(target_os = "macos") { | ||
| return Err(AppleSdkError::MissingCrossCompileNonMacOS { sdk_name }); | ||
| } | ||
|
|
||
| // NOTE: We could consider walking upwards in `SDKROOT` assuming Xcode directory structure, but | ||
| // that isn't what `xcrun` does, and might still not yield the desired result (e.g. if using an | ||
| // old SDK to compile for an old ARM iOS arch, we don't want `rustc` to pick a macOS SDK from | ||
| // the old Xcode). | ||
|
|
||
| // Try reading from `DEVELOPER_DIR` on all hosts. | ||
| if let Some(dir) = std::env::var_os("DEVELOPER_DIR") { | ||
| let dir = PathBuf::from(dir); | ||
| let sdkroot = sdk_root_in_developer_dir(&dir, sdk_name); | ||
|
|
||
| if try_exists(&sdkroot)? { | ||
| return Ok(sdkroot); | ||
| } else { | ||
| let sdkroot_bare = sdk_root_in_sdks_dir(&dir, sdk_name); | ||
| if try_exists(&sdkroot_bare)? { | ||
| return Ok(sdkroot_bare); | ||
| } else { | ||
| return Err(AppleSdkError::MissingDeveloperDir { dir, sdkroot, sdkroot_bare }); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| // Next, try to read the link that `xcode-select` sets. | ||
| // | ||
| // FIXME(madsmtm): Support cases where `/var/db/xcode_select_link` contains a relative path? | ||
| let path = PathBuf::from("/var/db/xcode_select_link"); | ||
| match fs::read_link(&path) { | ||
| Ok(dir) => { | ||
| let sdkroot = sdk_root_in_developer_dir(&dir, sdk_name); | ||
| if try_exists(&sdkroot)? { | ||
| return Ok(sdkroot); | ||
| } else { | ||
| let sdkroot_bare = sdk_root_in_sdks_dir(&dir, sdk_name); | ||
| if try_exists(&sdkroot_bare)? { | ||
| return Ok(sdkroot_bare); | ||
| } else { | ||
| return Err(AppleSdkError::MissingXcodeSelect { dir, sdkroot, sdkroot_bare }); | ||
| } | ||
| } | ||
| } | ||
| Err(err) if err.kind() == ErrorKind::NotFound => { | ||
| // Intentionally ignore not found errors, if `xcode-select --reset` is called the | ||
| // link will not exist. | ||
| } | ||
| Err(error) => return Err(AppleSdkError::FailedReading { path, error }), | ||
| } | ||
|
|
||
| // Next, fall back to reading from `/Applications/Xcode.app`. | ||
| let dir = PathBuf::from("/Applications/Xcode.app/Contents/Developer"); | ||
| if try_exists(&dir)? { | ||
| let sdkroot = sdk_root_in_developer_dir(&dir, sdk_name); | ||
| if try_exists(&sdkroot)? { | ||
| return Ok(sdkroot); | ||
| } else { | ||
| return Err(AppleSdkError::MissingXcode { sdkroot, sdk_name }); | ||
| } | ||
| } | ||
|
|
||
| // Finally, fall back to reading from `/Library/Developer/CommandLineTools`. | ||
| let dir = PathBuf::from("/Library/Developer/CommandLineTools"); | ||
| if try_exists(&dir)? { | ||
| let sdkroot = sdk_root_in_sdks_dir(&dir, sdk_name); | ||
| if try_exists(&sdkroot)? { | ||
| return Ok(sdkroot); | ||
| } else { | ||
| return Err(AppleSdkError::MissingCommandlineTools { sdkroot, sdk_name }); | ||
| } | ||
| } | ||
|
|
||
| Err(AppleSdkError::Missing { sdk_name }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| use std::io; | ||
| use std::path::PathBuf; | ||
| use std::process::Command; | ||
|
|
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| use super::find_sdk_root; | ||
|
|
||
| fn find_sdk_root_xcrun(sdk_name: &str) -> io::Result<PathBuf> { | ||
| let output = Command::new("xcrun") | ||
| .arg("-sdk") | ||
| .arg(sdk_name.to_lowercase()) | ||
| .arg("-show-sdk-path") | ||
| .output()?; | ||
| if output.status.success() { | ||
| // FIXME(madsmtm): If using this for real, we should not error on non-UTF-8 paths. | ||
| let output = String::from_utf8(output.stdout).unwrap(); | ||
| Ok(PathBuf::from(output.trim())) | ||
| } else { | ||
| let error = String::from_utf8(output.stderr); | ||
| let error = format!("process exit with error: {}", error.unwrap()); | ||
| Err(io::Error::new(io::ErrorKind::Other, &error[..])) | ||
| } | ||
| } | ||
|
|
||
| /// Ensure that our `find_sdk_root` matches `xcrun`'s behaviour. | ||
| /// | ||
| /// `xcrun` is quite slow the first time it's run after a reboot, so this test may take some time. | ||
| #[test] | ||
| #[cfg_attr(not(target_os = "macos"), ignore = "xcrun is only available on macOS")] | ||
| fn test_find_sdk_root() { | ||
| let sdks = [ | ||
| "MacOSX", | ||
| "AppleTVOS", | ||
| "AppleTVSimulator", | ||
| "iPhoneOS", | ||
| "iPhoneSimulator", | ||
| "WatchOS", | ||
| "WatchSimulator", | ||
| "XROS", | ||
| "XRSimulator", | ||
| ]; | ||
| for sdk_name in sdks { | ||
| if let Ok(expected) = find_sdk_root_xcrun(sdk_name) { | ||
| // `xcrun` prefers `MacOSX14.0.sdk` over `MacOSX.sdk`, so let's compare canonical paths. | ||
| let expected = std::fs::canonicalize(expected).unwrap(); | ||
| let actual = find_sdk_root(sdk_name).unwrap(); | ||
| let actual = std::fs::canonicalize(actual).unwrap(); | ||
| assert_eq!(expected, actual); | ||
| } else { | ||
| // The macOS SDK must always be findable in Rust's CI. | ||
| // | ||
| // The other SDKs are allowed to not be found in the current developer directory when | ||
| // running this test. | ||
| if sdk_name == "MacOSX" { | ||
| panic!("Could not find macOS SDK with `xcrun -sdk macosx -show-sdk-path`"); | ||
| } | ||
| } | ||
| } | ||
| } |
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