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Rollup merge of rust-lang#127108 - onur-ozkan:bin-helper, r=Kobzol
unify `dylib` and `bin_helpers` and create `shared_helpers::parse_value_from_args` `dylib` and `bin_helpers` were already used in similar logic. This PR unifies them under a `shared_helpers` module that is utilized by both the bootstrap library and shims. Additionally, created `parse_value_from_args` with a unit test. This helps avoid code duplication in shims and can also be used in the bootstrap library if needed (which is the case in one of `@Kobzol's` tasks). r? `@Kobzol`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| //! This module serves two purposes: | ||
| //! 1. It is part of the `utils` module and used in other parts of bootstrap. | ||
| //! 2. It is embedded inside bootstrap shims to avoid a dependency on the bootstrap library. | ||
| //! Therefore, this module should never use any other bootstrap module. This reduces binary | ||
| //! size and improves compilation time by minimizing linking time. | ||
| #![allow(dead_code)] | ||
|
|
||
| use std::env; | ||
| use std::ffi::OsString; | ||
| use std::fs::OpenOptions; | ||
| use std::io::Write; | ||
| use std::process::Command; | ||
| use std::str::FromStr; | ||
|
|
||
| #[cfg(test)] | ||
| mod tests; | ||
|
|
||
| /// Returns the environment variable which the dynamic library lookup path | ||
| /// resides in for this platform. | ||
| pub fn dylib_path_var() -> &'static str { | ||
| if cfg!(target_os = "windows") { | ||
| "PATH" | ||
| } else if cfg!(target_vendor = "apple") { | ||
| "DYLD_LIBRARY_PATH" | ||
| } else if cfg!(target_os = "haiku") { | ||
| "LIBRARY_PATH" | ||
| } else if cfg!(target_os = "aix") { | ||
| "LIBPATH" | ||
| } else { | ||
| "LD_LIBRARY_PATH" | ||
| } | ||
| } | ||
|
|
||
| /// Parses the `dylib_path_var()` environment variable, returning a list of | ||
| /// paths that are members of this lookup path. | ||
| pub fn dylib_path() -> Vec<std::path::PathBuf> { | ||
| let var = match std::env::var_os(dylib_path_var()) { | ||
| Some(v) => v, | ||
| None => return vec![], | ||
| }; | ||
| std::env::split_paths(&var).collect() | ||
| } | ||
|
|
||
| /// Given an executable called `name`, return the filename for the | ||
| /// executable for a particular target. | ||
| pub fn exe(name: &str, target: &str) -> String { | ||
| if target.contains("windows") { | ||
| format!("{name}.exe") | ||
| } else if target.contains("uefi") { | ||
| format!("{name}.efi") | ||
| } else { | ||
| name.to_string() | ||
| } | ||
| } | ||
|
|
||
| /// Parses the value of the "RUSTC_VERBOSE" environment variable and returns it as a `usize`. | ||
| /// If it was not defined, returns 0 by default. | ||
| /// | ||
| /// Panics if "RUSTC_VERBOSE" is defined with the value that is not an unsigned integer. | ||
| pub fn parse_rustc_verbose() -> usize { | ||
| match env::var("RUSTC_VERBOSE") { | ||
| Ok(s) => usize::from_str(&s).expect("RUSTC_VERBOSE should be an integer"), | ||
| Err(_) => 0, | ||
| } | ||
| } | ||
|
|
||
| /// Parses the value of the "RUSTC_STAGE" environment variable and returns it as a `String`. | ||
| /// | ||
| /// If "RUSTC_STAGE" was not set, the program will be terminated with 101. | ||
| pub fn parse_rustc_stage() -> String { | ||
| env::var("RUSTC_STAGE").unwrap_or_else(|_| { | ||
| // Don't panic here; it's reasonable to try and run these shims directly. Give a helpful error instead. | ||
| eprintln!("rustc shim: FATAL: RUSTC_STAGE was not set"); | ||
| eprintln!("rustc shim: NOTE: use `x.py build -vvv` to see all environment variables set by bootstrap"); | ||
| std::process::exit(101); | ||
| }) | ||
| } | ||
|
|
||
| /// Writes the command invocation to a file if `DUMP_BOOTSTRAP_SHIMS` is set during bootstrap. | ||
| /// | ||
| /// Before writing it, replaces user-specific values to create generic dumps for cross-environment | ||
| /// comparisons. | ||
| pub fn maybe_dump(dump_name: String, cmd: &Command) { | ||
| if let Ok(dump_dir) = env::var("DUMP_BOOTSTRAP_SHIMS") { | ||
| let dump_file = format!("{dump_dir}/{dump_name}"); | ||
|
|
||
| let mut file = OpenOptions::new().create(true).append(true).open(dump_file).unwrap(); | ||
|
|
||
| let cmd_dump = format!("{:?}\n", cmd); | ||
| let cmd_dump = cmd_dump.replace(&env::var("BUILD_OUT").unwrap(), "${BUILD_OUT}"); | ||
| let cmd_dump = cmd_dump.replace(&env::var("CARGO_HOME").unwrap(), "${CARGO_HOME}"); | ||
|
|
||
| file.write_all(cmd_dump.as_bytes()).expect("Unable to write file"); | ||
| } | ||
| } | ||
|
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||
| /// Finds `key` and returns its value from the given list of arguments `args`. | ||
| pub fn parse_value_from_args<'a>(args: &'a [OsString], key: &str) -> Option<&'a str> { | ||
| let mut args = args.iter(); | ||
| while let Some(arg) = args.next() { | ||
| let arg = arg.to_str().unwrap(); | ||
|
|
||
| if let Some(value) = arg.strip_prefix(&format!("{key}=")) { | ||
| return Some(value); | ||
| } else if arg == key { | ||
| return args.next().map(|v| v.to_str().unwrap()); | ||
| } | ||
| } | ||
|
|
||
| None | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| use super::parse_value_from_args; | ||
|
|
||
| #[test] | ||
| fn test_parse_value_from_args() { | ||
| let args = vec![ | ||
| "--stage".into(), | ||
| "1".into(), | ||
| "--version".into(), | ||
| "2".into(), | ||
| "--target".into(), | ||
| "x86_64-unknown-linux".into(), | ||
| ]; | ||
|
|
||
| assert_eq!(parse_value_from_args(args.as_slice(), "--stage").unwrap(), "1"); | ||
| assert_eq!(parse_value_from_args(args.as_slice(), "--version").unwrap(), "2"); | ||
| assert_eq!(parse_value_from_args(args.as_slice(), "--target").unwrap(), "x86_64-unknown-linux"); | ||
| assert!(parse_value_from_args(args.as_slice(), "random-key").is_none()); | ||
|
|
||
| let args = vec![ | ||
| "app-name".into(), | ||
| "--key".into(), | ||
| "value".into(), | ||
| "random-value".into(), | ||
| "--sysroot=/x/y/z".into(), | ||
| ]; | ||
| assert_eq!(parse_value_from_args(args.as_slice(), "--key").unwrap(), "value"); | ||
| assert_eq!(parse_value_from_args(args.as_slice(), "--sysroot").unwrap(), "/x/y/z"); | ||
| } |