emit cargo metadata duiring build scripts to avoid outdated buildscript outputs (#6743)

* rebuild on revision change
* rerun grammar build if grammars change
This commit is contained in:
Pascal Kuthe 2023-04-14 16:59:52 +02:00 committed by GitHub
parent 78e8066c3e
commit 896404c7ea
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2 changed files with 50 additions and 1 deletions

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@ -1,4 +1,5 @@
use std::borrow::Cow;
use std::path::Path;
use std::process::Command;
const VERSION: &str = include_str!("../VERSION");
@ -11,7 +12,7 @@ fn main() {
.filter(|output| output.status.success())
.and_then(|x| String::from_utf8(x.stdout).ok());
let version: Cow<_> = match git_hash {
let version: Cow<_> = match &git_hash {
Some(git_hash) => format!("{} ({})", VERSION, &git_hash[..8]).into(),
None => VERSION.into(),
};
@ -23,4 +24,40 @@ fn main() {
println!("cargo:rerun-if-changed=../VERSION");
println!("cargo:rustc-env=VERSION_AND_GIT_HASH={}", version);
if git_hash.is_none() {
return;
}
// we need to revparse because the git dir could be anywhere if you are
// using detached worktrees but there is no good way to obtain an OsString
// from command output so for now we can't accept non-utf8 paths here
// probably rare enouch where it doesn't matter tough we could use gitoxide
// here but that would be make it a hard dependency and slow compile times
let Some(git_dir): Option<String> = Command::new("git")
.args(["rev-parse", "--git-dir"])
.output()
.ok()
.filter(|output| output.status.success())
.and_then(|x| String::from_utf8(x.stdout).ok())
else{ return; };
// If heads starts pointing at something else (different branch)
// we need to return
let head = Path::new(&git_dir).join("HEAD");
if head.exists() {
println!("cargo:rerun-if-changed={}", head.display());
}
// if the thing head points to (branch) itself changes
// we need to return
let Some(head_ref): Option<String> = Command::new("git")
.args(["symbolic-ref", "HEAD"])
.output()
.ok()
.filter(|output| output.status.success())
.and_then(|x| String::from_utf8(x.stdout).ok())
else{ return; };
let head_ref = Path::new(&git_dir).join(head_ref);
if head_ref.exists() {
println!("cargo:rerun-if-changed={}", head_ref.display());
}
}

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@ -413,6 +413,18 @@ fn build_tree_sitter_library(
let mut library_path = parser_lib_path.join(&grammar.grammar_id);
library_path.set_extension(DYLIB_EXTENSION);
// if we are running inside a buildscript emit cargo metadata
// to detect if we are running from a buildscript check some env variables
// that cargo only sets for build scripts
if std::env::var("OUT_DIR").is_ok() && std::env::var("CARGO").is_ok() {
if let Some(scanner_path) = scanner_path.as_ref().and_then(|path| path.to_str()) {
println!("cargo:rerun-if-changed={scanner_path}");
}
if let Some(parser_path) = parser_path.to_str() {
println!("cargo:rerun-if-changed={parser_path}");
}
}
let recompile = needs_recompile(&library_path, &parser_path, &scanner_path)
.context("Failed to compare source and binary timestamps")?;