Auto merge of #8886 - justfortherec:fix/8882/gitconfig-includeif, r=alexcrichton

Start searching git config at new path

This lets `cargo new` follow `includeIf` blocks inside .gitignore.

Fixes #8882

I am not sure if removing the `__CARGO_TEST_ROOT` environment variable has any bad side effects. My quick grep of the repository didn't highlight anything in particular.

src/cargo/ops/cargo_new.rs

@@ -645,7 +645,7 @@ fn mk(config: &Config, opts: &MkOptions<'_>) -> CargoResult<()> {
     init_vcs(path, vcs, config)?;
     write_ignore_file(path, &ignore, vcs)?;
 
-    let (author_name, email) = discover_author()?;
+    let (author_name, email) = discover_author(path)?;
     let author = match (cfg.name, cfg.email, author_name, email) {
         (Some(name), Some(email), _, _)
         | (Some(name), None, _, Some(email))
@@ -781,8 +781,8 @@ fn get_environment_variable(variables: &[&str]) -> Option<String> {
     variables.iter().filter_map(|var| env::var(var).ok()).next()
 }
 
-fn discover_author() -> CargoResult<(String, Option<String>)> {
-    let git_config = find_git_config();
+fn discover_author(path: &Path) -> CargoResult<(String, Option<String>)> {
+    let git_config = find_git_config(path);
     let git_config = git_config.as_ref();
 
     let name_variables = [
@@ -833,10 +833,10 @@ fn discover_author() -> CargoResult<(String, Option<String>)> {
     Ok((name, email))
 }
 
-fn find_git_config() -> Option<GitConfig> {
+fn find_git_config(path: &Path) -> Option<GitConfig> {
     match env::var("__CARGO_TEST_ROOT") {
         Ok(test_root) => find_tests_git_config(test_root),
-        Err(_) => find_real_git_config(),
+        Err(_) => find_real_git_config(path),
     }
 }
 
@@ -851,12 +851,9 @@ fn find_tests_git_config(cargo_test_root: String) -> Option<GitConfig> {
     }
 }
 
-fn find_real_git_config() -> Option<GitConfig> {
-    match env::current_dir() {
-        Ok(cwd) => GitRepository::discover(cwd)
-            .and_then(|repo| repo.config())
-            .or_else(|_| GitConfig::open_default())
-            .ok(),
-        Err(_) => GitConfig::open_default().ok(),
-    }
+fn find_real_git_config(path: &Path) -> Option<GitConfig> {
+    GitRepository::discover(path)
+        .and_then(|repo| repo.config())
+        .or_else(|_| GitConfig::open_default())
+        .ok()
 }

tests/testsuite/new.rs

@@ -1,6 +1,6 @@
 //! Tests for the `cargo new` command.
 
-use cargo_test_support::paths;
+use cargo_test_support::paths::{self, CargoPathExt};
 use cargo_test_support::{cargo_process, git_process};
 use std::env;
 use std::fs::{self, File};
@@ -305,6 +305,50 @@ fn finds_git_author() {
     assert!(contents.contains(r#"authors = ["foo <gitfoo>"]"#), contents);
 }
 
+#[cargo_test]
+fn finds_git_author_in_included_config() {
+    let included_gitconfig = paths::root().join("foo").join(".gitconfig");
+    included_gitconfig.parent().unwrap().mkdir_p();
+    fs::write(
+        &included_gitconfig,
+        r#"
+        [user]
+            name = foo
+            email = bar
+        "#,
+    )
+    .unwrap();
+
+    let gitconfig = paths::home().join(".gitconfig");
+    fs::write(
+        &gitconfig,
+        format!(
+            r#"
+            [includeIf "gitdir/i:{}"]
+                path = {}
+            "#,
+            included_gitconfig
+                .parent()
+                .unwrap()
+                .join("")
+                .display()
+                .to_string()
+                .replace("\\", "/"),
+            included_gitconfig.display().to_string().replace("\\", "/"),
+        )
+        .as_bytes(),
+    )
+    .unwrap();
+
+    cargo_process("new foo/bar")
+        // Avoid the special treatment of tests to find git configuration
+        .env_remove("__CARGO_TEST_ROOT")
+        .run();
+    let toml = paths::root().join("foo/bar/Cargo.toml");
+    let contents = fs::read_to_string(&toml).unwrap();
+    assert!(contents.contains(r#"authors = ["foo <bar>"]"#), contents,);
+}
+
 #[cargo_test]
 fn finds_git_committer() {
     create_empty_gitconfig();