file-restore: add size to image files and components

Read image sizes (.pxar.fidx/.img.didx) from manifest and partition
sizes from /sys/...

Requires a change to ArchiveEntry, as DirEntryAttribute::Directory
does not have a size associated with it (and that's probably good).

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>

src/api2/types/mod.rs

@@ -1354,6 +1354,18 @@ pub struct ArchiveEntry {
 
 impl ArchiveEntry {
     pub fn new(filepath: &[u8], entry_type: Option<&DirEntryAttribute>) -> Self {
+        let size = match entry_type {
+            Some(DirEntryAttribute::File { size, .. }) => Some(*size),
+            _ => None,
+        };
+        Self::new_with_size(filepath, entry_type, size)
+    }
+
+    pub fn new_with_size(
+        filepath: &[u8],
+        entry_type: Option<&DirEntryAttribute>,
+        size: Option<u64>,
+    ) -> Self {
         Self {
             filepath: base64::encode(filepath),
             text: String::from_utf8_lossy(filepath.split(|x| *x == b'/').last().unwrap())
@@ -1363,13 +1375,10 @@ impl ArchiveEntry {
                 None => "v".to_owned(),
             },
             leaf: !matches!(entry_type, None | Some(DirEntryAttribute::Directory { .. })),
-            size: match entry_type {
-                Some(DirEntryAttribute::File { size, .. }) => Some(*size),
-                _ => None
-            },
+            size,
             mtime: match entry_type {
                 Some(DirEntryAttribute::File { mtime, .. }) => Some(*mtime),
-                _ => None
+                _ => None,
             },
         }
     }

src/bin/proxmox-file-restore.rs

@@ -194,7 +194,7 @@ async fn list(
                 } else {
                     None
                 };
-                entries.push(ArchiveEntry::new(path.as_bytes(), attr));
+                entries.push(ArchiveEntry::new_with_size(path.as_bytes(), attr, Some(file.size)));
             }
 
             Ok(entries)

src/bin/proxmox_restore_daemon/api.rs

@@ -200,11 +200,12 @@ fn list(
             for c in comps {
                 let mut c_path = path.clone();
                 c_path.push(b'/');
-                c_path.extend(c.as_bytes());
-                res.push(ArchiveEntry::new(
+                c_path.extend(c.0.as_bytes());
+                res.push(ArchiveEntry::new_with_size(
                     &c_path[..],
                     // this marks the beginning of a filesystem, i.e. '/', so this is a Directory
                     Some(&DirEntryAttribute::Directory { start: 0 }),
+                    Some(c.1),
                 ));
             }
         }

src/bin/proxmox_restore_daemon/disk.rs

@@ -36,13 +36,14 @@ lazy_static! {
 pub enum ResolveResult {
     Path(PathBuf),
     BucketTypes(Vec<&'static str>),
-    BucketComponents(Vec<String>),
+    BucketComponents(Vec<(String, u64)>),
 }
 
 struct PartitionBucketData {
     dev_node: String,
     number: i32,
     mountpoint: Option<PathBuf>,
+    size: u64,
 }
 
 /// A "Bucket" represents a mapping found on a disk, e.g. a partition, a zfs dataset or an LV. A
@@ -83,6 +84,12 @@ impl Bucket {
             Bucket::Partition(data) => data.number.to_string(),
         }
     }
+
+    fn size(&self) -> u64 {
+        match self {
+            Bucket::Partition(data) => data.size,
+        }
+    }
 }
 
 /// Functions related to the local filesystem. This mostly exists so we can use 'supported_fs' in
@@ -209,15 +216,23 @@ impl DiskState {
                     .trim()
                     .parse::<i32>()?;
 
+                // this *always* contains the number of 512-byte sectors, regardless of the true
+                // blocksize of this disk - which should always be 512 here anyway
+                let size = fs::file_read_firstline(&format!("{}/size", part_path))?
+                    .trim()
+                    .parse::<u64>()?
+                    * 512;
+
                 info!(
-                    "drive '{}' ('{}'): found partition '{}' ({})",
-                    name, fidx, devnode, number
+                    "drive '{}' ('{}'): found partition '{}' ({}, {}B)",
+                    name, fidx, devnode, number, size
                 );
 
                 let bucket = Bucket::Partition(PartitionBucketData {
                     dev_node: devnode,
                     mountpoint: None,
                     number,
+                    size,
                 });
 
                 parts.push(bucket);
@@ -281,7 +296,7 @@ impl DiskState {
                 let comps = buckets
                     .iter()
                     .filter(|b| b.type_string() == bucket_type)
-                    .map(Bucket::component_string)
+                    .map(|b| (b.component_string(), b.size()))
                     .collect();
                 return Ok(ResolveResult::BucketComponents(comps));
             }