backup: Add option --ignore-devid

src/backend/ignore.rs

@@ -19,6 +19,7 @@ pub struct LocalSource {
     builder: WalkBuilder,
     walker: Walk,
     with_atime: bool,
+    ignore_devid: bool,
     cache: UsersCache,
 }
 
@@ -31,6 +32,11 @@ pub struct LocalSourceOptions {
     #[merge(strategy = merge::bool::overwrite_false)]
     with_atime: bool,
 
+    /// Don't save device ID for files and directories
+    #[clap(long)]
+    #[merge(strategy = merge::bool::overwrite_false)]
+    ignore_devid: bool,
+
     /// Glob pattern to exclude/include (can be specified multiple times)
     #[clap(long, short = 'g', help_heading = "EXCLUDE OPTIONS")]
     #[merge(strategy = merge::vec::overwrite_empty)]
@@ -129,16 +135,15 @@ impl LocalSource {
             });
         }
 
-        let with_atime = opts.with_atime;
-        let cache = UsersCache::new();
         let builder = walk_builder;
         let walker = builder.build();
 
         Ok(Self {
             builder,
             walker,
-            with_atime,
-            cache,
+            with_atime: opts.with_atime,
+            ignore_devid: opts.ignore_devid,
+            cache: UsersCache::new(),
         })
     }
 }
@@ -172,12 +177,17 @@ impl Iterator for LocalSource {
             }
             item => item,
         }
-        .map(|e| map_entry(e?, self.with_atime, &self.cache))
+        .map(|e| map_entry(e?, self.with_atime, self.ignore_devid, &self.cache))
     }
 }
 
 // map_entry: turn entry into (Path, Node)
-fn map_entry(entry: DirEntry, with_atime: bool, cache: &UsersCache) -> Result<(PathBuf, Node)> {
+fn map_entry(
+    entry: DirEntry,
+    with_atime: bool,
+    ignore_devid: bool,
+    cache: &UsersCache,
+) -> Result<(PathBuf, Node)> {
     let name = entry.file_name();
     let m = entry.metadata()?;
 
@@ -201,7 +211,7 @@ fn map_entry(entry: DirEntry, with_atime: bool, cache: &UsersCache) -> Result<(P
     let size = if m.is_dir() { 0 } else { m.len() };
     let mode = map_mode_to_go(m.mode());
     let inode = m.ino();
-    let device_id = m.dev();
+    let device_id = if ignore_devid { 0 } else { m.dev() };
     let links = if m.is_dir() { 0 } else { m.nlink() };
 
     let meta = Metadata {