use std::{ffi::OsStr, io, path::Path, str::FromStr, sync::atomic::AtomicBool};
use anyhow::{anyhow, Context as AnyhowContext, Result};
use bytesize::ByteSize;
use gix::{
object, odb,
odb::{pack, pack::index},
NestedProgress,
};
pub use index::verify::Mode;
pub const PROGRESS_RANGE: std::ops::RangeInclusive<u8> = 1..=2;
use crate::OutputFormat;
#[derive(Debug, Eq, PartialEq, Hash, Clone, Copy)]
pub enum Algorithm {
LessTime,
LessMemory,
}
impl Algorithm {
pub fn variants() -> &'static [&'static str] {
&["less-time", "less-memory"]
}
}
impl FromStr for Algorithm {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let s_lc = s.to_ascii_lowercase();
Ok(match s_lc.as_str() {
"less-memory" => Algorithm::LessMemory,
"less-time" => Algorithm::LessTime,
_ => return Err(format!("Invalid verification algorithm: '{s}'")),
})
}
}
impl From<Algorithm> for index::traverse::Algorithm {
fn from(v: Algorithm) -> Self {
match v {
Algorithm::LessMemory => index::traverse::Algorithm::Lookup,
Algorithm::LessTime => index::traverse::Algorithm::DeltaTreeLookup,
}
}
}
pub struct Context<'a, W1: io::Write, W2: io::Write> {
pub output_statistics: Option<OutputFormat>,
pub out: W1,
pub err: W2,
pub thread_limit: Option<usize>,
pub mode: index::verify::Mode,
pub algorithm: Algorithm,
pub should_interrupt: &'a AtomicBool,
pub object_hash: gix::hash::Kind,
}
enum EitherCache<const SIZE: usize> {
Left(pack::cache::Never),
Right(pack::cache::lru::StaticLinkedList<SIZE>),
}
impl<const SIZE: usize> pack::cache::DecodeEntry for EitherCache<SIZE> {
fn put(&mut self, pack_id: u32, offset: u64, data: &[u8], kind: object::Kind, compressed_size: usize) {
match self {
EitherCache::Left(v) => v.put(pack_id, offset, data, kind, compressed_size),
EitherCache::Right(v) => v.put(pack_id, offset, data, kind, compressed_size),
}
}
fn get(&mut self, pack_id: u32, offset: u64, out: &mut Vec<u8>) -> Option<(object::Kind, usize)> {
match self {
EitherCache::Left(v) => v.get(pack_id, offset, out),
EitherCache::Right(v) => v.get(pack_id, offset, out),
}
}
}
pub fn pack_or_pack_index<W1, W2>(
path: impl AsRef<Path>,
mut progress: impl NestedProgress + 'static,
Context {
mut out,
mut err,
mode,
output_statistics,
thread_limit,
algorithm,
should_interrupt,
object_hash,
}: Context<'_, W1, W2>,
) -> Result<()>
where
W1: io::Write,
W2: io::Write,
{
let path = path.as_ref();
let ext = path.extension().and_then(OsStr::to_str).unwrap_or("");
const CACHE_SIZE: usize = 64;
let cache = || -> EitherCache<CACHE_SIZE> {
if matches!(algorithm, Algorithm::LessMemory) {
if output_statistics.is_some() {
EitherCache::Left(pack::cache::Never)
} else {
EitherCache::Right(pack::cache::lru::StaticLinkedList::<CACHE_SIZE>::default())
}
} else {
EitherCache::Left(pack::cache::Never)
}
};
let res = match ext {
"pack" => {
let pack = odb::pack::data::File::at(path, object_hash).with_context(|| "Could not open pack file")?;
pack.verify_checksum(&mut progress.add_child("Sha1 of pack"), should_interrupt)
.map(|id| (id, None))?
}
"idx" => {
let idx =
odb::pack::index::File::at(path, object_hash).with_context(|| "Could not open pack index file")?;
let packfile_path = path.with_extension("pack");
let pack = odb::pack::data::File::at(&packfile_path, object_hash)
.map_err(|e| {
writeln!(
err,
"Could not find matching pack file at '{}' - only index file will be verified, error was: {}",
packfile_path.display(),
e
)
.ok();
e
})
.ok();
idx.verify_integrity(
pack.as_ref().map(|p| gix::odb::pack::index::verify::PackContext {
data: p,
options: gix::odb::pack::index::verify::integrity::Options {
verify_mode: mode,
traversal: algorithm.into(),
make_pack_lookup_cache: cache,
thread_limit
}
}),
&mut progress,
should_interrupt,
)
.map(|o| (o.actual_index_checksum, o.pack_traverse_statistics))
.with_context(|| "Verification failure")?
}
"" => {
match path.file_name() {
Some(file_name) if file_name == "multi-pack-index" => {
let multi_index = gix::odb::pack::multi_index::File::at(path, None)?;
let res = multi_index.verify_integrity(&mut progress, should_interrupt, gix::odb::pack::index::verify::integrity::Options{
verify_mode: mode,
traversal: algorithm.into(),
thread_limit,
make_pack_lookup_cache: cache
})?;
match output_statistics {
Some(OutputFormat::Human) => {
for (index_name, stats) in multi_index.index_names().iter().zip(res.pack_traverse_statistics) {
writeln!(out, "{}", index_name.display()).ok();
drop(print_statistics(&mut out, &stats));
}
},
#[cfg(feature = "serde")]
Some(OutputFormat::Json) => serde_json::to_writer_pretty(out, &multi_index.index_names().iter().zip(res.pack_traverse_statistics).collect::<Vec<_>>())?,
_ => {}
}
return Ok(())
},
_ => return Err(anyhow!(
"Cannot determine data type on path without extension '{}', expecting default extensions 'idx' and 'pack'",
path.display()
))
}
}
ext => return Err(anyhow!("Unknown extension {ext:?}, expecting 'idx' or 'pack'")),
};
if let Some(stats) = res.1.as_ref() {
#[cfg_attr(not(feature = "serde"), allow(clippy::single_match))]
match output_statistics {
Some(OutputFormat::Human) => drop(print_statistics(&mut out, stats)),
#[cfg(feature = "serde")]
Some(OutputFormat::Json) => serde_json::to_writer_pretty(out, stats)?,
_ => {}
}
}
Ok(())
}
fn print_statistics(out: &mut impl io::Write, stats: &index::traverse::Statistics) -> io::Result<()> {
writeln!(out, "objects per delta chain length")?;
let mut chain_length_to_object: Vec<_> = stats.objects_per_chain_length.iter().map(|(a, b)| (*a, *b)).collect();
chain_length_to_object.sort_by_key(|e| e.0);
let mut total_object_count = 0;
for (chain_length, object_count) in chain_length_to_object.into_iter() {
total_object_count += object_count;
writeln!(out, "\t{chain_length:>2}: {object_count}")?;
}
writeln!(out, "\t->: {total_object_count}")?;
let pack::data::decode::entry::Outcome {
kind: _,
num_deltas,
decompressed_size,
compressed_size,
object_size,
} = stats.average;
let width = 30;
writeln!(out, "\naverages")?;
#[rustfmt::skip]
writeln!(
out,
"\t{:<width$} {};\n\t{:<width$} {};\n\t{:<width$} {};\n\t{:<width$} {};",
"delta chain length:", num_deltas,
"decompressed entry [B]:", decompressed_size,
"compressed entry [B]:", compressed_size,
"decompressed object size [B]:", object_size,
width = width
)?;
writeln!(out, "\ncompression")?;
#[rustfmt::skip]
writeln!(
out, "\t{:<width$}: {}\n\t{:<width$}: {}\n\t{:<width$}: {}\n\t{:<width$}: {}",
"compressed entries size", ByteSize(stats.total_compressed_entries_size).display().si(),
"decompressed entries size", ByteSize(stats.total_decompressed_entries_size).display().si(),
"total object size", ByteSize(stats.total_object_size).display().si(),
"pack size", ByteSize(stats.pack_size).display().si(),
width = width
)?;
#[rustfmt::skip]
writeln!(
out,
"\n\t{:<width$}: {}\n\t{:<width$}: {}\n\t{:<width$}: {}\n\t{:<width$}: {}",
"num trees", stats.num_trees,
"num blobs", stats.num_blobs,
"num commits", stats.num_commits,
"num tags", stats.num_tags,
width = width
)?;
let compression_ratio = stats.total_decompressed_entries_size as f64 / stats.total_compressed_entries_size as f64;
let delta_compression_ratio = stats.total_object_size as f64 / stats.total_compressed_entries_size as f64;
#[rustfmt::skip]
writeln!(
out,
"\n\t{:<width$}: {:.2}\n\t{:<width$}: {:.2}\n\t{:<width$}: {:.2}\n\t{:<width$}: {:.3}%",
"compression ratio", compression_ratio,
"delta compression ratio", delta_compression_ratio,
"delta gain", delta_compression_ratio / compression_ratio,
"pack overhead", (1.0 - (stats.total_compressed_entries_size as f64 / stats.pack_size as f64)) * 100.0,
width = width
)?;
Ok(())
}