4 files changed, 219 insertions, 0 deletions
diff --git a/vendor/gix-path/src/convert.rs b/vendor/gix-path/src/convert.rs
index 6a949529f..d8bf70353 100644
--- a/vendor/gix-path/src/convert.rs
+++ b/vendor/gix-path/src/convert.rs
@@ -82,6 +82,16 @@ pub fn into_bstr<'a>(path: impl Into<Cow<'a, Path>>) -> Cow<'a, BStr> {
     try_into_bstr(path).expect("prefix path doesn't contain ill-formed UTF-8")
 }
 
+/// Join `path` to `base` such that they are separated with a `/`, i.e. `base/path`.
+pub fn join_bstr_unix_pathsep<'a, 'b>(base: impl Into<Cow<'a, BStr>>, path: impl Into<&'b BStr>) -> Cow<'a, BStr> {
+    let mut base = base.into();
+    if !base.is_empty() && base.last() != Some(&b'/') {
+        base.to_mut().push(b'/');
+    }
+    base.to_mut().extend_from_slice(path.into());
+    base
+}
+
 /// Given `input` bytes, produce a `Path` from them ignoring encoding entirely if on unix.
 ///
 /// On windows, the input is required to be valid UTF-8, which is guaranteed if we wrote it before. There are some potential
diff --git a/vendor/gix-path/src/env/git.rs b/vendor/gix-path/src/env/git.rs
new file mode 100644
index 000000000..2e5d867bb
--- /dev/null
+++ b/vendor/gix-path/src/env/git.rs
@@ -0,0 +1,89 @@
+use std::{
+    path::Path,
+    process::{Command, Stdio},
+};
+
+use bstr::{BStr, BString, ByteSlice};
+
+/// Returns the file that contains git configuration coming with the installation of the `git` file in the current `PATH`, or `None`
+/// if no `git` executable was found or there were other errors during execution.
+pub(crate) fn install_config_path() -> Option<&'static BStr> {
+    static PATH: once_cell::sync::Lazy<Option<BString>> = once_cell::sync::Lazy::new(|| {
+        // Shortcut: in Msys shells this variable is set which allows to deduce the installation directory
+        // so we can save the `git` invocation.
+        #[cfg(windows)]
+        if let Some(mut exec_path) = std::env::var_os("EXEPATH").map(std::path::PathBuf::from) {
+            exec_path.push("etc");
+            exec_path.push("gitconfig");
+            return crate::os_string_into_bstring(exec_path.into()).ok();
+        }
+        let mut cmd = Command::new(if cfg!(windows) { "git.exe" } else { "git" });
+        cmd.args(["config", "-l", "--show-origin"])
+            .stdin(Stdio::null())
+            .stderr(Stdio::null());
+        first_file_from_config_with_origin(cmd.output().ok()?.stdout.as_slice().into()).map(ToOwned::to_owned)
+    });
+    PATH.as_ref().map(|b| b.as_ref())
+}
+
+fn first_file_from_config_with_origin(source: &BStr) -> Option<&BStr> {
+    let file = source.strip_prefix(b"file:")?;
+    let end_pos = file.find_byte(b'\t')?;
+    file[..end_pos].trim_with(|c| c == '"').as_bstr().into()
+}
+
+/// Given `config_path` as obtained from `install_config_path()`, return the path of the git installation base.
+pub(crate) fn config_to_base_path(config_path: &Path) -> &Path {
+    config_path
+        .parent()
+        .expect("config file paths always have a file name to pop")
+}
+
+#[cfg(test)]
+mod tests {
+    use std::path::Path;
+
+    #[test]
+    fn config_to_base_path() {
+        for (input, expected) in [
+            (
+                "/Applications/Xcode.app/Contents/Developer/usr/share/git-core/gitconfig",
+                "/Applications/Xcode.app/Contents/Developer/usr/share/git-core",
+            ),
+            ("C:/git-sdk-64/etc/gitconfig", "C:/git-sdk-64/etc"),
+            ("C:\\ProgramData/Git/config", "C:\\ProgramData/Git"),
+            ("C:/Program Files/Git/etc/gitconfig", "C:/Program Files/Git/etc"),
+        ] {
+            assert_eq!(super::config_to_base_path(Path::new(input)), Path::new(expected));
+        }
+    }
+    #[test]
+    fn first_file_from_config_with_origin() {
+        let macos = "file:/Applications/Xcode.app/Contents/Developer/usr/share/git-core/gitconfig	credential.helper=osxkeychain\nfile:/Users/byron/.gitconfig	push.default=simple\n";
+        let win_msys =
+            "file:C:/git-sdk-64/etc/gitconfig	core.symlinks=false\r\nfile:C:/git-sdk-64/etc/gitconfig	core.autocrlf=true";
+        let win_cmd = "file:C:/Program Files/Git/etc/gitconfig	diff.astextplain.textconv=astextplain\r\nfile:C:/Program Files/Git/etc/gitconfig	filter.lfs.clean=gix-lfs clean -- %f\r\n";
+        let win_msys_old = "file:\"C:\\ProgramData/Git/config\"	diff.astextplain.textconv=astextplain\r\nfile:\"C:\\ProgramData/Git/config\"	filter.lfs.clean=git-lfs clean -- %f\r\n";
+        let linux = "file:/home/parallels/.gitconfig	core.excludesfile=~/.gitignore\n";
+        let bogus = "something unexpected";
+        let empty = "";
+
+        for (source, expected) in [
+            (
+                macos,
+                Some("/Applications/Xcode.app/Contents/Developer/usr/share/git-core/gitconfig"),
+            ),
+            (win_msys, Some("C:/git-sdk-64/etc/gitconfig")),
+            (win_msys_old, Some("C:\\ProgramData/Git/config")),
+            (win_cmd, Some("C:/Program Files/Git/etc/gitconfig")),
+            (linux, Some("/home/parallels/.gitconfig")),
+            (bogus, None),
+            (empty, None),
+        ] {
+            assert_eq!(
+                super::first_file_from_config_with_origin(source.into()),
+                expected.map(Into::into)
+            );
+        }
+    }
+}
diff --git a/vendor/gix-path/src/env/mod.rs b/vendor/gix-path/src/env/mod.rs
new file mode 100644
index 000000000..170222c7a
--- /dev/null
+++ b/vendor/gix-path/src/env/mod.rs
@@ -0,0 +1,117 @@
+use std::{
+    ffi::OsString,
+    path::{Path, PathBuf},
+};
+
+use bstr::{BString, ByteSlice};
+
+mod git;
+
+/// Return the location at which installation specific git configuration file can be found, or `None`
+/// if the binary could not be executed or its results could not be parsed.
+///
+/// ### Performance
+///
+/// This invokes the git binary which is slow on windows.
+pub fn installation_config() -> Option<&'static Path> {
+    git::install_config_path().and_then(|p| crate::try_from_byte_slice(p).ok())
+}
+
+/// Return the location at which git installation specific configuration files are located, or `None` if the binary
+/// could not be executed or its results could not be parsed.
+///
+/// ### Performance
+///
+/// This invokes the git binary which is slow on windows.
+pub fn installation_config_prefix() -> Option<&'static Path> {
+    installation_config().map(git::config_to_base_path)
+}
+
+/// Returns the fully qualified path in the *xdg-home* directory (or equivalent in the home dir) to `file`,
+/// accessing `env_var(<name>)` to learn where these bases are.
+///
+/// Note that the `HOME` directory should ultimately come from [`home_dir()`] as it handles windows correctly.
+/// The same can be achieved by using [`var()`] as `env_var`.
+pub fn xdg_config(file: &str, env_var: &mut dyn FnMut(&str) -> Option<OsString>) -> Option<PathBuf> {
+    env_var("XDG_CONFIG_HOME")
+        .map(|home| {
+            let mut p = PathBuf::from(home);
+            p.push("git");
+            p.push(file);
+            p
+        })
+        .or_else(|| {
+            env_var("HOME").map(|home| {
+                let mut p = PathBuf::from(home);
+                p.push(".config");
+                p.push("git");
+                p.push(file);
+                p
+            })
+        })
+}
+
+/// Returns the platform dependent system prefix or `None` if it cannot be found (right now only on windows).
+///
+/// ### Performance
+///
+/// On windows, the slowest part is the launch of the `git.exe` executable in the PATH, which only happens when launched
+/// from outside of the `msys2` shell.
+///
+/// ### When `None` is returned
+///
+/// This happens only windows if the git binary can't be found at all for obtaining its executable path, or if the git binary
+/// wasn't built with a well-known directory structure or environment.
+pub fn system_prefix() -> Option<&'static Path> {
+    if cfg!(windows) {
+        static PREFIX: once_cell::sync::Lazy<Option<PathBuf>> = once_cell::sync::Lazy::new(|| {
+            if let Some(root) = std::env::var_os("EXEPATH").map(PathBuf::from) {
+                for candidate in ["mingw64", "mingw32"] {
+                    let candidate = root.join(candidate);
+                    if candidate.is_dir() {
+                        return Some(candidate);
+                    }
+                }
+            }
+
+            let path = std::process::Command::new("git.exe")
+                .arg("--exec-path")
+                .stderr(std::process::Stdio::null())
+                .output()
+                .ok()?
+                .stdout;
+            let path = BString::new(path)
+                .trim_with(|b| b.is_ascii_whitespace())
+                .to_path()
+                .ok()?
+                .to_owned();
+
+            let one_past_prefix = path.components().enumerate().find_map(|(idx, c)| {
+                matches!(c,std::path::Component::Normal(name) if name.to_str() == Some("libexec")).then_some(idx)
+            })?;
+            Some(path.components().take(one_past_prefix.checked_sub(1)?).collect())
+        });
+        PREFIX.as_deref()
+    } else {
+        Path::new("/").into()
+    }
+}
+
+/// Returns `$HOME` or `None` if it cannot be found.
+#[cfg(target_family = "wasm")]
+pub fn home_dir() -> Option<PathBuf> {
+    std::env::var("HOME").map(PathBuf::from).ok()
+}
+
+#[cfg(not(target_family = "wasm"))]
+pub use home::home_dir;
+
+/// Returns the contents of an environment variable of `name` with some special handling
+/// for certain environment variables (like `HOME`) for platform compatibility.
+pub fn var(name: &str) -> Option<OsString> {
+    if name == "HOME" {
+        home_dir().map(PathBuf::into_os_string)
+    } else {
+        std::env::var_os(name)
+    }
+}
diff --git a/vendor/gix-path/src/lib.rs b/vendor/gix-path/src/lib.rs
index 70a9bc53f..6895aca46 100644
--- a/vendor/gix-path/src/lib.rs
+++ b/vendor/gix-path/src/lib.rs
@@ -66,3 +66,6 @@ mod spec;
 ///
 pub mod realpath;
 pub use realpath::function::{realpath, realpath_opts};
+
+/// Information about the environment in terms of locations of resources.
+pub mod env;