proxmox-backup/src/backup/manifest.rs

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use failure::*;
use std::convert::TryFrom;
use serde_json::{json, Value};
use crate::backup::BackupDir;
pub const MANIFEST_BLOB_NAME: &str = "index.json.blob";
struct FileInfo {
filename: String,
size: u64,
csum: [u8; 32],
}
pub struct BackupManifest {
snapshot: BackupDir,
files: Vec<FileInfo>,
}
impl BackupManifest {
pub fn new(snapshot: BackupDir) -> Self {
Self { files: Vec::new(), snapshot }
}
pub fn add_file(&mut self, filename: String, size: u64, csum: [u8; 32]) {
self.files.push(FileInfo { filename, size, csum });
}
fn lookup_file_info(&self, name: &str) -> Result<&FileInfo, Error> {
let info = self.files.iter().find(|item| item.filename == name);
match info {
None => bail!("manifest does not contain file '{}'", name),
Some(info) => Ok(info),
}
}
pub fn verify_file(&self, name: &str, csum: &[u8; 32], size: u64) -> Result<(), Error> {
let info = self.lookup_file_info(name)?;
if size != info.size {
bail!("wrong size for file '{}' ({} != {}", name, info.size, size);
}
if csum != &info.csum {
bail!("wrong checksum for file '{}'", name);
}
Ok(())
}
pub fn into_json(self) -> Value {
json!({
"backup-type": self.snapshot.group().backup_type(),
"backup-id": self.snapshot.group().backup_id(),
"backup-time": self.snapshot.backup_time().timestamp(),
"files": self.files.iter()
.fold(Vec::new(), |mut acc, info| {
acc.push(json!({
"filename": info.filename,
"size": info.size,
"csum": proxmox::tools::digest_to_hex(&info.csum),
}));
acc
})
})
}
}
impl TryFrom<Value> for BackupManifest {
type Error = Error;
fn try_from(data: Value) -> Result<Self, Error> {
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use crate::tools::{required_string_property, required_integer_property, required_array_property};
proxmox::tools::try_block!({
let backup_type = required_string_property(&data, "backup-type")?;
let backup_id = required_string_property(&data, "backup-id")?;
let backup_time = required_integer_property(&data, "backup-time")?;
let snapshot = BackupDir::new(backup_type, backup_id, backup_time);
let mut files = Vec::new();
for item in required_array_property(&data, "files")?.iter() {
let filename = required_string_property(item, "filename")?.to_owned();
let csum = required_string_property(item, "csum")?;
let csum = proxmox::tools::hex_to_digest(csum)?;
let size = required_integer_property(item, "size")? as u64;
files.push(FileInfo { filename, size, csum });
}
Ok(Self { files, snapshot })
}).map_err(|err: Error| format_err!("unable to parse backup manifest - {}", err))
}
}