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|
use std::{
borrow::Cow,
ffi::OsString,
path::{Path, PathBuf},
};
use crate::Source;
/// The category of a [`Source`], in order of ascending precedence.
#[derive(Clone, Copy, Debug, Eq, PartialEq, Hash, Ord, PartialOrd)]
pub enum Kind {
/// A special configuration file that ships with the git installation, and is thus tied to the used git binary.
GitInstallation,
/// A source shared for the entire system.
System,
/// Application specific configuration unique for each user of the `System`.
Global,
/// Configuration relevant only to the repository, possibly including the worktree.
Repository,
/// Configuration specified after all other configuration was loaded for the purpose of overrides.
Override,
}
impl Kind {
/// Return a list of sources associated with this `Kind` of source, in order of ascending precedence.
pub fn sources(self) -> &'static [Source] {
let src = match self {
Kind::GitInstallation => &[Source::GitInstallation] as &[_],
Kind::System => &[Source::System],
Kind::Global => &[Source::Git, Source::User],
Kind::Repository => &[Source::Local, Source::Worktree],
Kind::Override => &[Source::Env, Source::Cli, Source::Api],
};
debug_assert!(
src.iter().all(|src| src.kind() == self),
"BUG: classification of source has to match the ordering here, see `Source::kind()`"
);
src
}
}
impl Source {
/// Return true if the source indicates a location within a file of a repository.
pub const fn kind(self) -> Kind {
use Source::*;
match self {
GitInstallation => Kind::GitInstallation,
System => Kind::System,
Git | User => Kind::Global,
Local | Worktree => Kind::Repository,
Env | Cli | Api | EnvOverride => Kind::Override,
}
}
/// Returns the location at which a file of this type would be stored, or `None` if
/// there is no notion of persistent storage for this source, with `env_var` to obtain environment variables.
/// Note that the location can be relative for repository-local sources like `Local` and `Worktree`,
/// and the caller has to known which base it it relative to, namely the `common_dir` in the `Local` case
/// and the `git_dir` in the `Worktree` case.
/// Be aware that depending on environment overrides, multiple scopes might return the same path, which should
/// only be loaded once nonetheless.
///
/// With `env_var` it becomes possible to prevent accessing environment variables entirely to comply with `gix-sec`
/// permissions for example.
pub fn storage_location(self, env_var: &mut dyn FnMut(&str) -> Option<OsString>) -> Option<Cow<'static, Path>> {
use Source::*;
match self {
GitInstallation => git::install_config_path().map(gix_path::from_bstr),
System => env_var("GIT_CONFIG_NO_SYSTEM")
.is_none()
.then(|| PathBuf::from(env_var("GIT_CONFIG_SYSTEM").unwrap_or_else(|| "/etc/gitconfig".into())).into()),
Git => match env_var("GIT_CONFIG_GLOBAL") {
Some(global_override) => Some(PathBuf::from(global_override).into()),
None => env_var("XDG_CONFIG_HOME")
.map(|home| {
let mut p = PathBuf::from(home);
p.push("git");
p.push("config");
p
})
.or_else(|| {
env_var("HOME").map(|home| {
let mut p = PathBuf::from(home);
p.push(".config");
p.push("git");
p.push("config");
p
})
})
.map(Cow::Owned),
},
User => env_var("GIT_CONFIG_GLOBAL")
.map(|global_override| PathBuf::from(global_override).into())
.or_else(|| {
env_var("HOME").map(|home| {
let mut p = PathBuf::from(home);
p.push(".gitconfig");
p.into()
})
}),
Local => Some(Path::new("config").into()),
Worktree => Some(Path::new("config.worktree").into()),
Env | Cli | Api | EnvOverride => None,
}
}
}
/// Environment information involving the `git` program itself.
mod git {
use std::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 fn install_config_path() -> Option<&'static BStr> {
static PATH: once_cell::sync::Lazy<Option<BString>> = once_cell::sync::Lazy::new(|| {
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].as_bstr().into()
}
#[cfg(test)]
mod tests {
#[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 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_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)
);
}
}
}
}
|
