add remove-duplicates option

Cargo.lock

@@ -73,6 +73,15 @@ version = "2.9.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2261d10cca569e4643e526d8dc2e62e433cc8aba21ab764233731f8d369bf394"
 
+[[package]]
+name = "block-buffer"
+version = "0.11.0-rc.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9ef36a6fcdb072aa548f3da057640ec10859eb4e91ddf526ee648d50c76a949"
+dependencies = [
+ "hybrid-array",
+]
+
 [[package]]
 name = "cfg-if"
 version = "1.0.3"
@@ -131,6 +140,30 @@ version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b05b61dc5112cbb17e4b6cd61790d9845d13888356391624cbe7e41efeac1e75"
 
+[[package]]
+name = "const-oid"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0dabb6555f92fb9ee4140454eb5dcd14c7960e1225c6d1a6cc361f032947713e"
+
+[[package]]
+name = "cpufeatures"
+version = "0.2.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "59ed5838eebb26a2bb2e58f6d5b5316989ae9d08bab10e0e6d103e656d1b0280"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "crypto-common"
+version = "0.2.0-rc.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a8235645834fbc6832939736ce2f2d08192652269e11010a6240f61b908a1c6"
+dependencies = [
+ "hybrid-array",
+]
+
 [[package]]
 name = "ctrlc"
 version = "3.5.0"
@@ -142,6 +175,17 @@ dependencies = [
  "windows-sys 0.61.2",
 ]
 
+[[package]]
+name = "digest"
+version = "0.11.0-rc.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dac89f8a64533a9b0eaa73a68e424db0fb1fd6271c74cc0125336a05f090568d"
+dependencies = [
+ "block-buffer",
+ "const-oid",
+ "crypto-common",
+]
+
 [[package]]
 name = "dispatch"
 version = "0.2.0"
@@ -161,7 +205,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "39cab71617ae0d63f51a36d69f866391735b51691dbda63cf6f96d042b63efeb"
 dependencies = [
  "libc",
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -188,11 +232,13 @@ version = "0.1.0"
 dependencies = [
  "clap",
  "ctrlc",
+ "hex",
  "home",
  "main_error",
  "notify-debouncer-full",
  "regex",
  "serde",
+ "sha2",
  "thiserror",
  "toml",
  "tracing",
@@ -212,6 +258,12 @@ version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
 
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
 [[package]]
 name = "home"
 version = "0.5.11"
@@ -221,6 +273,15 @@ dependencies = [
  "windows-sys 0.59.0",
 ]
 
+[[package]]
+name = "hybrid-array"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f471e0a81b2f90ffc0cb2f951ae04da57de8baa46fa99112b062a5173a5088d0"
+dependencies = [
+ "typenum",
+]
+
 [[package]]
 name = "indexmap"
 version = "2.11.4"
@@ -380,7 +441,7 @@ version = "0.50.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7957b9740744892f114936ab4a57b3f487491bbeafaf8083688b16841a4240e5"
 dependencies = [
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -458,7 +519,7 @@ dependencies = [
  "errno",
  "libc",
  "linux-raw-sys",
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]
@@ -509,6 +570,17 @@ dependencies = [
  "serde_core",
 ]
 
+[[package]]
+name = "sha2"
+version = "0.11.0-rc.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d1e3878ab0f98e35b2df35fe53201d088299b41a6bb63e3e34dada2ac4abd924"
+dependencies = [
+ "cfg-if",
+ "cpufeatures",
+ "digest",
+]
+
 [[package]]
 name = "sharded-slab"
 version = "0.1.7"
@@ -666,6 +738,12 @@ dependencies = [
  "tracing-log",
 ]
 
+[[package]]
+name = "typenum"
+version = "1.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "562d481066bde0658276a35467c4af00bdc6ee726305698a55b86e61d7ad82bb"
+
 [[package]]
 name = "unicode-ident"
 version = "1.0.19"
@@ -706,7 +784,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
 dependencies = [
- "windows-sys 0.60.2",
+ "windows-sys 0.61.2",
 ]
 
 [[package]]

Cargo.toml

@@ -18,3 +18,5 @@ tracing = "0.1.41"
 tracing-subscriber = "0.3.20"
 notify-debouncer-full = "0.6.0"
 ctrlc = "3.5.0"
+sha2 = "0.11.0-rc.2"
+hex = "0.4.3"

README.md

@@ -92,5 +92,13 @@ to automatically create a symlink to the new location of the file.
 symlink = "~/Downloads/last"
 ```
 
-Note that this symlink will only be set for files that match any of the
+## Lastest download symlink
-configured rules.
+
+Galton can also be used to clean up duplicate downloads, when enabled, it will
+check for any existing file with the same contents in the target directory and
+delete the newly download file if a duplicate is found.
+
+```toml
+[watch]
+remove-duplicates = true
+```

config-sample.toml

@@ -1,5 +1,6 @@
 [watch]
 symlink = "~/Downloads/last"
+remove-duplicates = true
 
 [[rule]]
 name = "\\.(csv|CSV)"

nix/hm-module.nix

@@ -9,7 +9,10 @@ with lib; let
   format = pkgs.formats.toml {};
   removeNulls = filterAttrs (_: val: val != null);
   configFile = format.generate "galton.toml" {
-    watch = removeNulls {inherit (cfg) symlink;};
+    watch = removeNulls {
+      inherit (cfg) symlink;
+      remove-duplicates = cfg.removeDuplicates;
+    };
     rule = map removeNulls cfg.rules;
   };
 in {
@@ -28,6 +31,12 @@ in {
       description = "Create a symlink to matched files";
     };
 
+    removeDuplicates = mkOption {
+      type = types.bool;
+      default = false;
+      description = "Remove duplicate downloads";
+    };
+
     rules = mkOption {
       default = [];
       type = types.listOf (types.submodule {

src/config.rs

@@ -31,6 +31,8 @@ impl GaltonConfig {
 #[derive(Debug, Deserialize, Default)]
 pub struct WatchConfig {
     symlink: Option<String>,
+    #[serde(rename = "remove-duplicates", default)]
+    pub remove_duplicates: bool,
 }
 
 impl WatchConfig {

src/file.rs

@@ -1,3 +1,8 @@
+use hex::FromHex;
+use sha2::{Digest, Sha256};
+use std::fs::File;
+use std::io::Read;
+use std::os::unix::fs::MetadataExt;
 use std::path::{Path, PathBuf};
 use std::time::UNIX_EPOCH;
 use thiserror::Error;
@@ -6,9 +11,11 @@ pub struct FileInfo {
     pub path: String,
     pub url: Option<String>,
     pub referrer: Option<String>,
+    pub sha256: [u8; 32],
     #[allow(dead_code)]
     pub mtime: u64,
     pub mtime_str: String,
+    pub size: u64,
 }
 
 impl FileInfo {
@@ -37,8 +44,10 @@ impl FileInfo {
             path: path.into(),
             url: None,
             referrer: None,
+            sha256: [0; 32],
             mtime,
             mtime_str: mtime.to_string(),
+            size: stat.size(),
         };
 
         let attributes = xattr::list(path).unwrap_or_default();
@@ -52,12 +61,33 @@ impl FileInfo {
                     match attr {
                         "user.xdg.origin.url" => file.url = Some(val),
                         "user.xdg.referrer.url" => file.referrer = Some(val),
+                        "user.checksum.sha256" => {
+                            if let Ok(sha) = <[u8; 32]>::from_hex(&val) {
+                                file.sha256 = sha;
+                            }
+                        }
                         _ => {}
                     }
                 }
             }
         }
 
+        if file.sha256 == [0; 32] {
+            file.sha256 = hash_file(path).map_err(|error| FileError::Hash {
+                path: path.into(),
+                error,
+            })?;
+            xattr::set(
+                path,
+                "user.checksum.sha256",
+                hex::encode(file.sha256).as_bytes(),
+            )
+            .map_err(|error| FileError::StoreHash {
+                path: path.into(),
+                error,
+            })?;
+        }
+
         Ok(file)
     }
 
@@ -74,6 +104,51 @@ impl FileInfo {
             .map(|(parent, _)| parent)
             .unwrap_or("")
     }
+
+    pub fn is_duplicate(&self, other: impl AsRef<Path>) -> Result<bool, FileError> {
+        let other = other.as_ref();
+        let other_stat = other.metadata().map_err(|error| FileError::Stat {
+            path: other.into(),
+            error,
+        })?;
+
+        if other_stat.size() != self.size {
+            return Ok(false);
+        }
+        Ok(self.sha256
+            == load_or_calculate_hash(other).map_err(|error| FileError::Hash {
+                path: other.into(),
+                error,
+            })?)
+    }
+}
+
+fn load_or_calculate_hash(path: impl AsRef<Path>) -> Result<[u8; 32], std::io::Error> {
+    let path = path.as_ref();
+    if let Ok(Some(val)) = xattr::get(path, "user.checksum.sha256") {
+        if let Ok(Ok(hash)) = String::from_utf8(val).as_deref().map(<[u8; 32]>::from_hex) {
+            return Ok(hash);
+        }
+    }
+
+    let hash = hash_file(path)?;
+    xattr::set(path, "user.checksum.sha256", hex::encode(hash).as_bytes())?;
+    Ok(hash)
+}
+
+fn hash_file(path: impl AsRef<Path>) -> Result<[u8; 32], std::io::Error> {
+    let mut file = File::open(path)?;
+    let mut buffer = [0u8; 8192];
+    let mut hasher = Sha256::new();
+
+    loop {
+        let count = file.read(&mut buffer)?;
+        if count == 0 {
+            break;
+        }
+        hasher.update(&buffer[..count]);
+    }
+    Ok(hasher.finalize().0)
 }
 
 #[derive(Debug, Error)]
@@ -85,4 +160,14 @@ pub enum FileError {
         path: PathBuf,
         error: std::io::Error,
     },
+    #[error("Failed to hash: {}", path.display())]
+    Hash {
+        path: PathBuf,
+        error: std::io::Error,
+    },
+    #[error("Failed to store hash for: {}", path.display())]
+    StoreHash {
+        path: PathBuf,
+        error: std::io::Error,
+    },
 }

src/main.rs

@@ -5,10 +5,10 @@ use clap::builder::styling::{AnsiColor, Effects};
 use clap::builder::Styles;
 use clap::{Parser, Subcommand};
 use main_error::MainResult;
-use notify_debouncer_full::notify::event::{AccessKind, AccessMode};
+use notify_debouncer_full::notify::event::{AccessKind, AccessMode, ModifyKind, RenameMode};
 use notify_debouncer_full::notify::{EventKind, RecursiveMode};
 use notify_debouncer_full::{new_debouncer, DebounceEventResult};
-use std::fs::{copy, create_dir_all, remove_file, rename};
+use std::fs::{copy, create_dir_all, read_dir, remove_file, rename};
 use std::io::ErrorKind;
 use std::os::unix::fs::symlink;
 use std::path::{Path, PathBuf};
@@ -63,7 +63,7 @@ fn main() -> MainResult {
     match args.command {
         Commands::File { path } => {
             let file = FileInfo::load(path)?;
-            handle_file(&file, &config.rule);
+            handle_file(&file, &config.rule, false);
         }
         Commands::Watch { path, recursive } => {
             let path = normalize_path(path);
@@ -87,7 +87,12 @@ fn main() -> MainResult {
                 }
             })?;
             for res in rx {
-                handle_watch_event(res, &rules, symlink.as_deref());
+                handle_watch_event(
+                    res,
+                    &rules,
+                    symlink.as_deref(),
+                    config.watch.remove_duplicates,
+                );
             }
         }
     }
@@ -95,24 +100,55 @@ fn main() -> MainResult {
     Ok(())
 }
 
-fn handle_watch_event(result: DebounceEventResult, rules: &[Rule], link_target: Option<&str>) {
+fn handle_watch_event(
+    result: DebounceEventResult,
+    rules: &[Rule],
+    link_target: Option<&str>,
+    remove_duplicates: bool,
+) {
+    let handle_path = |path: &Path| {
+        // give originfox time to set xattr
+        sleep(Duration::from_millis(200));
+        if is_part(path) {
+            debug!("skipping part file");
+            return;
+        }
+
+        match FileInfo::load(path) {
+            Ok(file) => maybe_link(
+                handle_file(&file, rules, remove_duplicates).as_deref(),
+                link_target,
+            ),
+            Err(error) => {
+                error!(%error, "failed to load file info");
+            }
+        }
+    };
+
     match result {
         Ok(events) => {
             for event in events {
-                if event.kind == EventKind::Access(AccessKind::Close(AccessMode::Write)) {
+                match event.kind {
-                    for path in &event.paths {
+                    EventKind::Access(AccessKind::Close(AccessMode::Write)) => {
-                        debug!("write event for {}", path.display());
+                        for path in &event.paths {
-                        // give originfox time to set xattr
+                            debug!("write event for {}", path.display());
-                        sleep(Duration::from_millis(200));
+                            handle_path(path);
-                        match FileInfo::load(path) {
-                            Ok(file) => {
-                                maybe_link(handle_file(&file, rules).as_deref(), link_target)
-                            }
-                            Err(error) => {
-                                error!(%error, "failed to load file info");
-                            }
                         }
                     }
+
+                    EventKind::Modify(ModifyKind::Name(RenameMode::Both)) => {
+                        if event.paths.len() == 2 {
+                            let from = &event.paths[0];
+                            let to = &event.paths[1];
+                            debug!("rename event for {} -> {}", from.display(), to.display());
+                            if is_part(from) && !is_part(to) {
+                                handle_path(to);
+                            }
+                        } else {
+                            error!("Invalid rename event");
+                        }
+                    }
+                    _ => {}
                 }
             }
         }
@@ -124,7 +160,11 @@ fn handle_watch_event(result: DebounceEventResult, rules: &[Rule], link_target:
     }
 }
 
-fn maybe_link(source: Option<&str>, target: Option<&str>) {
+fn is_part(path: &Path) -> bool {
+    path.extension().and_then(|ext| ext.to_str()) == Some("part")
+}
+
+fn maybe_link(source: Option<&Path>, target: Option<&str>) {
     if let (Some(source), Some(target)) = (source, target) {
         if Path::new(target).exists() {
             if let Err(error) = remove_file(target) {
@@ -134,7 +174,7 @@ fn maybe_link(source: Option<&str>, target: Option<&str>) {
         }
         match symlink(source, target) {
             Ok(()) => {
-                info!(to = target, from = source, "created symlink");
+                info!(to = target, from = %source.display(), "created symlink");
             }
             Err(error) => {
                 error!(%error, "failed to link target");
@@ -154,10 +194,22 @@ fn match_file(file: &FileInfo, rules: &[Rule]) -> Option<RuleMatch> {
 }
 
 #[instrument(skip_all, fields(file = file.path))]
-fn handle_file(file: &FileInfo, rules: &[Rule]) -> Option<String> {
+fn handle_file(file: &FileInfo, rules: &[Rule], remove_duplicates: bool) -> Option<PathBuf> {
     let Some(result) = match_file(file, rules) else {
-        info!("no matches");
+        info!(url = file.url, "removing duplicate");
-        return None;
+
+        if remove_duplicates {
+            let parent = Path::new(&file.path).parent().unwrap();
+            if let Some(duplicate) = has_duplicate(file, parent) {
+                info!(url = file.url, diplicate = %duplicate.display(), "removing duplicate");
+                if let Err(error) = remove_file(&file.path) {
+                    error!(%error, "failed to remove duplicate");
+                }
+                return Some(duplicate);
+            }
+        }
+
+        return Some(file.path.clone().into());
     };
 
     let parent = result.target.as_deref().unwrap_or_else(|| file.parent());
@@ -168,12 +220,22 @@ fn handle_file(file: &FileInfo, rules: &[Rule]) -> Option<String> {
         return None;
     }
 
+    if remove_duplicates {
+        if let Some(duplicate) = has_duplicate(file, parent) {
+            info!(url = file.url, diplicate = %duplicate.display(), "removing duplicate");
+            if let Err(error) = remove_file(&file.path) {
+                error!(%error, "failed to remove duplicate");
+            }
+            return Some(duplicate);
+        }
+    }
+
     let target = format!("{parent}/{name}");
 
     match cross_storage_move(&file.path, &target) {
         Ok(()) => {
             info!(target, "moved file");
-            Some(target)
+            Some(target.into())
         }
         Err(error) => {
             info!(target, ?error, "failed to moved file");
@@ -182,6 +244,37 @@ fn handle_file(file: &FileInfo, rules: &[Rule]) -> Option<String> {
     }
 }
 
+fn has_duplicate(file: &FileInfo, dir: impl AsRef<Path>) -> Option<PathBuf> {
+    let dir = match read_dir(dir) {
+        Ok(dir) => dir,
+        Err(error) => {
+            error!(%error, "failed to list target directory");
+            return None;
+        }
+    };
+    for entry in dir.flatten() {
+        let path = entry.path();
+        if path.to_str() == Some(file.path.as_str()) {
+            continue;
+        }
+        if !path.is_file() {
+            continue;
+        }
+
+        match file.is_duplicate(&path) {
+            Ok(is_dup) => {
+                if is_dup {
+                    return Some(path);
+                }
+            }
+            Err(error) => {
+                error!(%error, path = %path.display(), "failed to determine if a file is duplicate");
+            }
+        }
+    }
+    None
+}
+
 fn cross_storage_move(source: impl AsRef<Path>, target: impl AsRef<Path>) -> std::io::Result<()> {
     let source = source.as_ref();
     let target = target.as_ref();