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mutabledatapack: write version number header

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Summary:
The mutabledatapack format has a one byte header containing the version
number.

Reviewed By: quark-zju

Differential Revision: D8305653

fbshipit-source-id: c4a96dc48e64acd2c5849034e5d90b87363fbc8d
This commit is contained in:
Durham Goode 2018-07-05 14:43:48 -07:00 committed by Facebook Github Bot
parent 99a11bbb24
commit 4588cc18c8
1 changed files with 7 additions and 4 deletions
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11
lib/revisionstore/src/mutabledatapack.rs
View File

@ -12,7 +12,7 @@ use tempfile::NamedTempFile;
use error::Result;
pub struct MutableDataPack {
version: u32,
version: u8,
dir: PathBuf,
data_file: NamedTempFile,
hasher: Sha1,
@ -29,7 +29,7 @@ impl MutableDataPack {
/// when close() is called, at which point the MutableDataPack is consumed. If
/// close() is not called, the temporary file is cleaned up when the object is
/// release.
pub fn new(dir: &Path, version: u32) -> Result<Self> {
pub fn new(dir: &Path, version: u8) -> Result<Self> {
if !dir.is_dir() {
return Err(format_err!(
"cannot create mutable datapack in non-directory '{:?}'",
@ -37,13 +37,16 @@ impl MutableDataPack {
));
}
let data_file = NamedTempFile::new_in(&dir)?;
let mut data_file = NamedTempFile::new_in(&dir)?;
let mut hasher = Sha1::new();
data_file.write_u8(version)?;
hasher.input(&[version]);
Ok(MutableDataPack {
version: version,
dir: dir.to_path_buf(),
data_file: data_file,
hasher: Sha1::new(),
hasher: hasher,
})
}