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initial implementation

This commit is contained in:
Adrian Wannenmacher 2023-09-24 05:38:22 +02:00
commit 0647ac4c48
Signed by: tfld
GPG Key ID: 19D986ECB1E492D5
7 changed files with 793 additions and 0 deletions
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[package]
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publish = false
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src/id.rs Normal file
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use std::{collections::BTreeSet, fmt::Display};
use serde::Serialize;
#[derive(Debug, Default, Serialize)]
pub struct Ids {
pub users: BTreeSet<u32>,
pub groups: BTreeSet<u32>,
}
impl Display for Ids {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
writeln!(f, "users:")?;
for user in &self.users {
writeln!(f, " {user}")?;
}
writeln!(f, "")?;
writeln!(f, "groups:")?;
for group in &self.groups {
writeln!(f, " {group}")?;
}
Ok(())
}
}

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use std::{
fs::read_dir,
os::linux::fs::MetadataExt,
path::{Path, PathBuf},
};
use anyhow::{ensure, Context, Result};
use clap::Parser;
use crate::{id::Ids, name::Names, output::Output};
mod id;
mod name;
mod output;
fn main() -> Result<()> {
human_panic::setup_panic!();
let args = Args::parse();
let mut ids = Ids::default();
for root in args.roots {
fs_entry(&root, &mut ids)?;
}
let output: Box<dyn Output> = match args.raw {
false => Box::new(Names::try_from(ids).context("failed to get names")?),
true => Box::new(ids),
};
let output = match args.json {
false => output.human_readable(),
true => output.json().context("failed json serialization")?,
};
println!("{output}");
Ok(())
}
#[derive(Debug, Parser)]
#[clap(author, about, version)]
struct Args {
/// Whether to output data as json.
#[clap(long)]
pub json: bool,
/// Whether to output raw uid and gid numbers.
#[clap(long)]
pub raw: bool,
/// The roots to use for discovery.
pub roots: Vec<PathBuf>,
}
fn fs_entry(entry: &Path, summary: &mut Ids) -> Result<()> {
let display = entry.display();
ensure!(
entry.is_symlink() || entry.exists(),
format!("{} doesn't exist", display)
);
let meta = entry
.symlink_metadata()
.context(format!("failed to get metadata for {}", display))?;
summary.users.insert(meta.st_uid());
summary.groups.insert(meta.st_gid());
if entry.is_dir() {
let children = read_dir(entry).context(format!("failed to read dir {}", display))?;
for e in children {
let e = e.context(format!("invalid child for {}", display))?;
fs_entry(&e.path(), summary).context(format!("failed to read child of {}", display))?;
}
}
Ok(())
}

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use std::{collections::BTreeSet, fmt::Display};
use anyhow::{anyhow,Error, Result};
use file_owner::{Owner, Group};
use serde::Serialize;
use crate::id::Ids;
#[derive(Debug, Default, Serialize)]
pub struct Names {
pub users: BTreeSet<String>,
pub groups: BTreeSet<String>,
}
impl Display for Names {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
writeln!(f, "users:")?;
for user in &self.users {
writeln!(f, " {user}")?;
}
writeln!(f, "")?;
writeln!(f, "groups:")?;
for group in &self.groups {
writeln!(f, " {group}")?;
}
Ok(())
}
}
impl TryFrom<Ids> for Names {
type Error = Error;
fn try_from(value: Ids) -> Result<Self> {
Ok(Self {
users: value
.users
.into_iter()
.map(|u| match Owner::from_uid(u).name() {
Ok(Some(name)) => Ok(name),
Ok(None) => Err(anyhow!("no name for user {u}")),
Err(_) => Err(anyhow!("failed to get name for user {u}")),
})
.collect::<Result<_>>()?,
groups: value
.groups
.into_iter()
.map(|g| match Group::from_gid(g).name() {
Ok(Some(name)) => Ok(name),
Ok(None) => Err(anyhow!("no name for group {g}")),
Err(_) => Err(anyhow!("failed to get name for group {g}")),
})
.collect::<Result<_>>()?,
})
}
}

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use serde::Serialize;
pub trait Output {
fn human_readable(&self) -> String;
fn json(&self) -> Result<String, serde_json::Error>;
}
impl<T> Output for T
where
T: ToString + Serialize,
{
fn human_readable(&self) -> String {
self.to_string()
}
fn json(&self) -> Result<String, serde_json::Error> {
serde_json::to_string_pretty(&self)
}
}