continue data gathering past individual failures

src/main.rs

@@ -1,6 +1,6 @@
 use std::{fs::read_dir, os::linux::fs::MetadataExt, path::Path};
 
-use anyhow::{anyhow, ensure, Context, Result};
+use anyhow::{anyhow, ensure, Context, Error, Result};
 use clap::Parser;
 
 use crate::{cli::Args, summary::Summary};
@@ -14,25 +14,15 @@ fn main() -> Result<()> {
 
     let mut summary = Summary::default();
     for root in args.roots {
-        fs_entry(&root, &mut summary)?;
+        fs_entry(&root, &mut summary);
     }
 
     if !args.raw {
         let (uf, gf) = summary.lookup_names();
-
-        for (uid, e) in uf {
-            eprintln!(
-                "{:#}",
-                anyhow!(e).context(format!("failed to get name for user {uid}"))
-            );
-        }
-
-        for (gid, e) in gf {
-            eprintln!(
-                "{:#}",
-                anyhow!(e).context(format!("failed to get name for group {gid}"))
-            );
-        }
+        uf.into_iter()
+            .for_each(|(uid, e)| print_err(e, format!("failed to get name for user {uid}")));
+        gf.into_iter()
+            .for_each(|(gid, e)| print_err(e, format!("failed to get name for group {gid}")));
     }
     let output = match args.json {
         false => summary.to_string(),
@@ -44,26 +34,48 @@ fn main() -> Result<()> {
 }
 
 /// Perform gid & uid gathering for a file, or a directory and its children.
-fn fs_entry(entry: &Path, summary: &mut Summary) -> Result<()> {
+fn fs_entry(entry: &Path, summary: &mut Summary) {
     let display = entry.display();
-    ensure!(
-        entry.is_symlink() || entry.exists(),
-        format!("{} doesn't exist", display)
-    );
+    if !entry.exists() && !entry.is_symlink() {
+        print_root_err(format!("{display} doesn't exist"));
+    }
+
+    let meta = match entry.symlink_metadata() {
+        Ok(meta) => meta,
+        Err(e) => {
+            print_err(e, format!("failed to get metadata for {display}"));
+            return;
+        }
+    };
 
-    let meta = entry
-        .symlink_metadata()
-        .context(format!("failed to get metadata for {}", display))?;
     summary.add_user(meta.st_uid());
     summary.add_group(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)?;
+        let children = match read_dir(entry) {
+            Ok(children) => children,
+            Err(e) => {
+                print_err(e, format!("failed to read dir {display}"));
+                return;
+            }
+        };
+
+        for child in children {
+            match child {
+                Ok(child) => fs_entry(&child.path(), summary),
+                Err(e) => {
+                    print_err(e, format!("invalid child for {display}"));
+                    return;
+                }
+            }
         }
     }
+}
 
-    Ok(())
+fn print_root_err(message: String) {
+    eprintln!("{:#}", anyhow!("{message}"));
+}
+
+fn print_err(err: impl Into<Error>, message: String) {
+    eprintln!("{:#}", err.into().context(message));
 }