btrfs_cli/inspect/
rootid.rs

1use crate::{Format, Runnable};
2use anyhow::{Context, Result};
3use clap::Parser;
4use std::{fs::File, os::unix::io::AsFd, path::PathBuf};
5
6/// Get tree ID of the containing subvolume of path
7#[derive(Parser, Debug)]
8pub struct RootidCommand {
9    /// Path to a file or directory on the btrfs filesystem
10    path: PathBuf,
11}
12
13impl Runnable for RootidCommand {
14    fn run(&self, _format: Format, _dry_run: bool) -> Result<()> {
15        let file = File::open(&self.path).with_context(|| {
16            format!("failed to open '{}'", self.path.display())
17        })?;
18        let fd = file.as_fd();
19
20        let rootid = btrfs_uapi::inode::lookup_path_rootid(fd).context(
21            "failed to look up root ID (is this a btrfs filesystem?)",
22        )?;
23
24        println!("{}", rootid);
25        Ok(())
26    }
27}
btrfs_cli/inspect/rootid.rs

btrfs_cli/inspect/
rootid.rs
