feat: Add highlighting of mounted directories (Linux only)

Closes eza-community#167

Cargo.toml

@@ -67,6 +67,9 @@ default-features = false
 # See: https://github.com/eza-community/eza/pull/192
 features = ["vendored-libgit2"]
 
+[target.'cfg(target_os = "linux")'.dependencies]
+proc-mounts = "0.3"
+
 [target.'cfg(unix)'.dependencies]
 uzers = "0.11.2"
 

README.md

@@ -34,6 +34,7 @@ By deliberately making some decisions differently, eza attempts to be a more fea
 
  -   Fixes [“The Grid Bug”](https://github.com/eza-community/eza/issues/66#issuecomment-1656758327) introduced in exa 2021.
  -   Hyperlink support.
+ -   Mount point details.
  -   Selinux context output.
  -   Git repo status output.
  -   Human readable relative dates.
@@ -170,6 +171,7 @@ These options are available when running with `--long` (`-l`):
 - **-H**, **--links**: list each file’s number of hard links
 - **-i**, **--inode**: list each file’s inode number
 - **-m**, **--modified**: use the modified timestamp field
+- **-M**, **--mounts**: Show mount details (Linux only).
 - **-S**, **--blocksize**: show size of allocated file system blocks
 - **-t**, **--time=(field)**: which timestamp field to use
 - **-u**, **--accessed**: use the accessed timestamp field

completions/fish/eza.fish

@@ -89,6 +89,7 @@ complete -c eza -s o -l octal-permissions -d "List each file's permission in oct
 complete -c eza -l no-filesize -d "Suppress the filesize field"
 complete -c eza -l no-user -d "Suppress the user field"
 complete -c eza -l no-time -d "Suppress the time field"
+complete -c eza -s M -l mounts -d "Show mount details"
 
 # Optional extras
 complete -c eza -l git -d "List each file's Git status, if tracked"

completions/zsh/_eza

@@ -60,6 +60,7 @@ __eza() {
         --git-repos-no-status"[List each git-repos branch name (much faster)]" \
         {-@,--extended}"[List each file's extended attributes and sizes]" \
         {-Z,--context}"[List each file's security context]" \
+        {-M,--mounts}"[Show mount details (long mode only)]" \
         '*:filename:_files'
 }
 

man/eza.1.md

@@ -149,6 +149,9 @@ These options are available when running with `--long` (`-l`):
 `-m`, `--modified`
 : Use the modified timestamp field.
 
+`-M`, `--mounts`
+: Show mount details (Linux only)
+
 `-n`, `--numeric`
 : List numeric user and group IDs.
 

src/fs/file.rs

@@ -12,11 +12,14 @@ use std::time::{Duration, UNIX_EPOCH};
 
 use log::*;
 
+use crate::ALL_MOUNTS;
 use crate::fs::dir::Dir;
 use crate::fs::feature::xattr;
 use crate::fs::feature::xattr::{FileAttributes, Attribute};
 use crate::fs::fields as f;
 
+use super::mounts::MountedFs;
+
 
 /// A **File** is a wrapper around one of Rust’s `PathBuf` values, along with
 /// associated data about the file.
@@ -79,7 +82,9 @@ pub struct File<'dir> {
     pub deref_links: bool,
     /// The extended attributes of this file.
     pub extended_attributes: Vec<Attribute>,
-}
+
+    /// The absolute value of this path, used to look up mount points.
+    pub absolute_path: PathBuf,}
 
 impl<'dir> File<'dir> {
     pub fn from_args<PD, FN>(path: PathBuf, parent_dir: PD, filename: FN, deref_links: bool) -> io::Result<File<'dir>>
@@ -94,8 +99,9 @@ impl<'dir> File<'dir> {
         let metadata   = std::fs::symlink_metadata(&path)?;
         let is_all_all = false;
         let extended_attributes = File::gather_extended_attributes(&path);
+        let absolute_path = std::fs::canonicalize(&path)?;
 
-        Ok(File { name, ext, path, metadata, parent_dir, is_all_all, deref_links, extended_attributes })
+        Ok(File { name, ext, path, metadata, parent_dir, is_all_all, deref_links, extended_attributes, absolute_path })
     }
 
     pub fn new_aa_current(parent_dir: &'dir Dir) -> io::Result<File<'dir>> {
@@ -107,8 +113,9 @@ impl<'dir> File<'dir> {
         let is_all_all = true;
         let parent_dir = Some(parent_dir);
         let extended_attributes = File::gather_extended_attributes(&path);
+        let absolute_path = std::fs::canonicalize(&path)?;
 
-        Ok(File { path, parent_dir, metadata, ext, name: ".".into(), is_all_all, deref_links: false, extended_attributes })
+        Ok(File { path, parent_dir, metadata, ext, name: ".".into(), is_all_all, deref_links: false, extended_attributes, absolute_path })
     }
 
     pub fn new_aa_parent(path: PathBuf, parent_dir: &'dir Dir) -> io::Result<File<'dir>> {
@@ -119,8 +126,9 @@ impl<'dir> File<'dir> {
         let is_all_all = true;
         let parent_dir = Some(parent_dir);
         let extended_attributes = File::gather_extended_attributes(&path);
+        let absolute_path = std::fs::canonicalize(&path)?;
 
-        Ok(File { path, parent_dir, metadata, ext, name: "..".into(), is_all_all, deref_links: false, extended_attributes })
+        Ok(File { path, parent_dir, metadata, ext, name: "..".into(), is_all_all, deref_links: false, extended_attributes, absolute_path })
     }
 
     /// A file’s name is derived from its string. This needs to handle directories
@@ -243,6 +251,21 @@ impl<'dir> File<'dir> {
         self.metadata.file_type().is_socket()
     }
 
+    /// Whether this file is a mount point
+    pub fn is_mount_point(&self) -> bool {
+        if cfg!(target_os = "linux") && self.is_directory() {
+            return ALL_MOUNTS.contains_key(&self.absolute_path);
+        }
+        false
+    }
+
+    /// The filesystem device and type for a mount point
+    pub fn mount_point_info(&self) -> Option<&MountedFs> {
+        if cfg!(target_os = "linux") {
+            return ALL_MOUNTS.get(&self.absolute_path);
+        }
+        None
+    }
 
     /// Re-prefixes the path pointed to by this file, if it’s a symlink, to
     /// make it an absolute path that can be accessed from whichever
@@ -293,7 +316,17 @@ impl<'dir> File<'dir> {
                 let ext  = File::ext(&path);
                 let name = File::filename(&path);
                 let extended_attributes = File::gather_extended_attributes(&absolute_path);
-                let file = File { parent_dir: None, path, ext, metadata, name, is_all_all: false, deref_links: self.deref_links, extended_attributes };
+                let file = File {
+                    parent_dir: None,
+                    path,
+                    ext,
+                    metadata,
+                    name,
+                    is_all_all: false,
+                    deref_links: self.deref_links,
+                    extended_attributes,
+                    absolute_path
+                };
                 FileTarget::Ok(Box::new(file))
             }
             Err(e) => {

src/fs/mod.rs

@@ -8,3 +8,4 @@ pub mod dir_action;
 pub mod feature;
 pub mod fields;
 pub mod filter;
+pub mod mounts;

src/fs/mounts.rs

@@ -0,0 +1,6 @@
+/// Details of a mounted filesystem.
+pub struct MountedFs {
+    pub dest: String,
+    pub fstype: String,
+    pub source: String,
+}

src/main.rs

@@ -22,6 +22,7 @@
 #![allow(clippy::upper_case_acronyms)]
 #![allow(clippy::wildcard_imports)]
 
+use std::collections::HashMap;
 use std::env;
 use std::ffi::{OsStr, OsString};
 use std::io::{self, Write, ErrorKind};
@@ -31,6 +32,13 @@ use ansi_term::{ANSIStrings, Style};
 
 use log::*;
 
+#[cfg(target_os = "linux")]
+use proc_mounts::MountList;
+
+#[macro_use]
+extern crate lazy_static;
+
+use crate::fs::mounts::MountedFs;
 use crate::fs::{Dir, File};
 use crate::fs::feature::git::GitCache;
 use crate::fs::filter::GitIgnore;
@@ -45,6 +53,27 @@ mod options;
 mod output;
 mod theme;
 
+lazy_static! {
+    static ref ALL_MOUNTS: HashMap<PathBuf, MountedFs> = {
+        #[cfg(target_os = "linux")]
+        match MountList::new() {
+            Ok(mount_list) => {
+                let mut m = HashMap::new();
+                mount_list.0.iter().for_each(|mount| {
+                    m.insert(mount.dest.clone(), MountedFs {
+                        dest: mount.dest.to_string_lossy().into_owned(),
+                        fstype: mount.fstype.clone(),
+                        source: mount.source.to_string_lossy().into(),
+                    });
+                });
+                m
+            }
+            Err(_) => HashMap::new()
+        }
+        #[cfg(not(target_os = "linux"))]
+        HashMap::new()
+    };
+}
 
 fn main() {
     use std::process::exit;

src/options/flags.rs

@@ -54,7 +54,8 @@ pub static TIME:       Arg = Arg { short: Some(b't'), long: "time",       takes_
 pub static ACCESSED:   Arg = Arg { short: Some(b'u'), long: "accessed",   takes_value: TakesValue::Forbidden };
 pub static CREATED:    Arg = Arg { short: Some(b'U'), long: "created",    takes_value: TakesValue::Forbidden };
 pub static TIME_STYLE: Arg = Arg { short: None,       long: "time-style", takes_value: TakesValue::Necessary(Some(TIME_STYLES)) };
-pub static HYPERLINK:  Arg = Arg { short: None,       long: "hyperlink",  takes_value: TakesValue::Forbidden};
+pub static HYPERLINK:  Arg = Arg { short: None,       long: "hyperlink",  takes_value: TakesValue::Forbidden };
+pub static MOUNTS:     Arg = Arg { short: Some(b'M'), long: "mounts",     takes_value: TakesValue::Forbidden };
 const TIMES: Values = &["modified", "changed", "accessed", "created"];
 const TIME_STYLES: Values = &["default", "long-iso", "full-iso", "iso", "relative"];
 
@@ -85,7 +86,7 @@ pub static ALL_ARGS: Args = Args(&[
     &IGNORE_GLOB, &GIT_IGNORE, &ONLY_DIRS,
 
     &BINARY, &BYTES, &GROUP, &NUMERIC, &HEADER, &ICONS, &INODE, &LINKS, &MODIFIED, &CHANGED,
-    &BLOCKSIZE, &TIME, &ACCESSED, &CREATED, &TIME_STYLE, &HYPERLINK,
+    &BLOCKSIZE, &TIME, &ACCESSED, &CREATED, &TIME_STYLE, &HYPERLINK, &MOUNTS,
     &NO_PERMISSIONS, &NO_FILESIZE, &NO_USER, &NO_TIME, &NO_ICONS,
 
     &GIT, &NO_GIT, &GIT_REPOS, &GIT_REPOS_NO_STAT,

src/options/help.rs

@@ -53,6 +53,7 @@ LONG VIEW OPTIONS
   -H, --links              list each file's number of hard links
   -i, --inode              list each file's inode number
   -m, --modified           use the modified timestamp field
+  -M, --mounts             show mount details (Linux only)
   -n, --numeric            list numeric user and group IDs
   -S, --blocksize          show size of allocated file system blocks
   -t, --time FIELD         which timestamp field to list (modified, accessed, created)

src/options/view.rs

@@ -82,7 +82,8 @@ impl Mode {
         // user about flags that won’t have any effect.
         if matches.is_strict() {
             for option in &[ &flags::BINARY, &flags::BYTES, &flags::INODE, &flags::LINKS,
-                             &flags::HEADER, &flags::BLOCKSIZE, &flags::TIME, &flags::GROUP, &flags::NUMERIC ] {
+                             &flags::HEADER, &flags::BLOCKSIZE, &flags::TIME, &flags::GROUP, &flags::NUMERIC,
+                             &flags::MOUNTS ] {
                 if matches.has(option)? {
                     return Err(OptionsError::Useless(option, false, &flags::LONG));
                 }
@@ -119,6 +120,7 @@ impl details::Options {
             header: false,
             xattr: xattr::ENABLED && matches.has(&flags::EXTENDED)?,
             secattr: xattr::ENABLED && matches.has(&flags::SECURITY_CONTEXT)?,
+            mounts: matches.has(&flags::MOUNTS)?,
         };
 
         Ok(details)
@@ -139,6 +141,7 @@ impl details::Options {
             header: matches.has(&flags::HEADER)?,
             xattr: xattr::ENABLED && matches.has(&flags::EXTENDED)?,
             secattr: xattr::ENABLED && matches.has(&flags::SECURITY_CONTEXT)?,
+            mounts: matches.has(&flags::MOUNTS)?,
         })
     }
 }

src/output/details.rs

@@ -92,6 +92,7 @@ use crate::theme::Theme;
 ///
 /// Almost all the heavy lifting is done in a Table object, which handles the
 /// columns for each row.
+#[allow(clippy::struct_excessive_bools)] /// This clearly isn't a state machine
 #[derive(PartialEq, Eq, Debug)]
 pub struct Options {
 
@@ -109,6 +110,9 @@ pub struct Options {
 
     /// Whether to show each file's security attribute.
     pub secattr: bool,
+
+    /// Whether to show a directory's mounted filesystem details
+    pub mounts: bool,
 }
 
 
@@ -288,6 +292,7 @@ impl<'a> Render<'a> {
 
             let file_name = self.file_style.for_file(egg.file, self.theme)
                                 .with_link_paths()
+                                .with_mount_details(self.opts.mounts)
                                 .paint()
                                 .promote();