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use std::env;
use std::ffi::OsString;
use std::fmt::Debug;
use std::fs::{DirEntry, metadata, read_dir, read_to_string};
use std::io;
use std::path::{Path, PathBuf};
use std::process::{Command, Stdio, ExitStatus};
use std::string::FromUtf8Error;
use clap::Clap;
use thiserror::Error;
/// Load environment variables from DIR (or ~/.envdir).
///
/// For each non-directory entry in DIR, this will output a brief shell script
/// to set an environment variable with the same name. If the entry is an
/// executable program, it will be run (with the current environment) and its
/// output will be used as the value of the environment variable. Otherwise, it
/// will be read, and its content will be used. In either case, a single
/// trailing newline will be removed, if present.
///
/// This process skips any file which can't be run or read, as appropriate, and
/// outputs a warning on stderr.
///
/// The intended use case for this is in shell profiles, in the form:
///
/// eval "$(envdir-helper)"
///
/// The generated output is compatible with sh, and thus with bash and zsh.
#[derive(Clap)]
#[clap(version=env!("CARGO_PKG_VERSION"))]
struct Opts {
/// Directory to read environment variables from [default: ~/.envdir]
envdir: Option<PathBuf>,
/// Export generated environment variables [default: true]
#[clap(long)]
export: Option<bool>,
}
#[derive(Error, Debug)]
enum EnvdirError {
#[error("failed to locate default envdir")]
NoDefaultEnvdir(#[from] DefaultDirError),
#[error("failed to read envdir directory")]
EnvdirListFailed(#[from] io::Error),
#[error("failed to decode a filename")]
PathStringError(#[from] PathStringError),
}
const SELF: &str = env!("CARGO_BIN_NAME");
fn main() -> Result<(), EnvdirError> {
let opts: Opts = Opts::parse();
let envdir = match opts.envdir {
None => default_envdir()?,
Some(envdir) => envdir,
};
let output_fn = match opts.export {
None => detect_env_script(&envdir)?,
Some(true) => export_env_script,
Some(false) => no_export_env_script,
};
for path in read_dir(envdir)?
.filter_map(skip_failing_direntry)
.map(|entry| entry.path())
.filter(|path| !path.is_dir())
{
let name = path_to_string(&path)?;
match env_content(&path) {
Ok(content) => println!("{}", output_fn(name, &content)),
Err(e) => eprintln!("{}: error reading env value for {:?}: {:?}", SELF, name, e),
};
}
Ok(())
}
fn skip_failing_direntry<E: Debug>(result: Result<DirEntry, E>) -> Option<DirEntry> {
match result {
Ok(direntry) => Some(direntry),
Err(e) => {
eprintln!("{}: error reading envdir: {:?}", SELF, e);
None
}
}
}
#[derive(Error, Debug)]
#[error("a required environment variable was not set")]
struct DefaultDirError(#[from] env::VarError);
fn default_envdir() -> Result<PathBuf, DefaultDirError> {
let mut envdir = PathBuf::from(env::var("HOME")?);
envdir.push(".envdir");
Ok(envdir)
}
type ExportScript = fn(&str, &str) -> String;
fn detect_env_script(path: &Path) -> Result<ExportScript, PathStringError> {
let file_name = path_to_string(path)?;
Ok(if file_name.ends_with("rc") {
no_export_env_script
} else {
export_env_script
})
}
fn no_export_env_script(name: &str, content: &str) -> String {
let name = shlex::quote(name);
let content= shlex::quote(content);
format!("{}={}", name, content)
}
fn export_env_script(name: &str, content: &str) -> String {
let name = shlex::quote(name);
let content= shlex::quote(content);
format!("{}={}; export {}", name, content, name)
}
#[derive(Error, Debug)]
enum PathStringError {
#[error("path has no name: {0}")]
NamelessPath(PathBuf),
#[error("path has a non-unicode name: {0:?}")]
NonUnicodePath(OsString),
}
fn path_to_string(path: &Path) -> Result<&str, PathStringError> {
use PathStringError::*;
let file_name = path.file_name()
.ok_or_else(|| NamelessPath(path.into()))?;
file_name.to_str()
.ok_or_else(|| NonUnicodePath(file_name.into()))
}
#[derive(Error, Debug)]
enum EnvContentError {
#[error("io error: {0}")]
IoError(#[from] io::Error),
#[error("program produced non-UTF-8 output: {0}")]
NonUnicodeOutput(#[from] FromUtf8Error),
#[error("program {0:?} exited with status: {1}")]
ProgramFailed(PathBuf, ExitStatus)
}
fn env_content(path: &Path) -> Result<String, EnvContentError> {
let mut content = if is_program(path)? {
env_program_content(path)?
} else {
env_file_content(path)?
};
if content.ends_with("\n") {
content.pop();
}
Ok(content)
}
fn is_program(path: &Path) -> io::Result<bool> {
const EXEC_MASK: u32 = (libc::S_IXUSR | libc::S_IXGRP | libc::S_IXOTH) as u32;
use std::os::unix::fs::PermissionsExt;
let metadata = metadata(path)?;
let permissions = metadata.permissions();
Ok(permissions.mode() & EXEC_MASK != 0)
}
fn env_program_content(path: &Path) -> Result<String, EnvContentError> {
use EnvContentError::*;
let output = Command::new(path)
.stdin(Stdio::piped())
.stdout(Stdio::piped())
.stderr(Stdio::inherit())
.output()?;
if output.status.success() {
let output = String::from_utf8(output.stdout)?;
Ok(output)
} else {
Err(ProgramFailed(path.to_path_buf(), output.status))
}
}
fn env_file_content(path: &Path) -> Result<String, EnvContentError> {
Ok(read_to_string(path)?)
}
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