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// debugdata.rs
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//
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// Copyright 2020 Antoine Cezar <antoine.cezar@octobus.net>
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//
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// This software may be used and distributed according to the terms of the
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// GNU General Public License version 2 or any later version.
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use crate::repo::Repo;
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use crate::revlog::revlog::{Revlog, RevlogError};
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use crate::revlog::NodePrefix;
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use crate::revlog::Revision;
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/// Kind of data to debug
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#[derive(Debug, Copy, Clone)]
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pub enum DebugDataKind {
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Changelog,
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Manifest,
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}
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/// Kind of error encountered by DebugData
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#[derive(Debug)]
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pub enum DebugDataErrorKind {
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/// Error when reading a `revlog` file.
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IoError(std::io::Error),
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/// The revision has not been found.
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InvalidRevision,
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/// Found more than one revision whose ID match the requested prefix
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AmbiguousPrefix,
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/// A `revlog` file is corrupted.
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CorruptedRevlog,
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/// The `revlog` format version is not supported.
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UnsuportedRevlogVersion(u16),
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/// The `revlog` data format is not supported.
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UnknowRevlogDataFormat(u8),
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}
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/// A DebugData error
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#[derive(Debug)]
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pub struct DebugDataError {
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/// Kind of error encountered by DebugData
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pub kind: DebugDataErrorKind,
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}
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impl From<DebugDataErrorKind> for DebugDataError {
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fn from(kind: DebugDataErrorKind) -> Self {
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DebugDataError { kind }
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}
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}
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impl From<std::io::Error> for DebugDataError {
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fn from(err: std::io::Error) -> Self {
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let kind = DebugDataErrorKind::IoError(err);
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DebugDataError { kind }
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}
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}
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impl From<RevlogError> for DebugDataError {
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fn from(err: RevlogError) -> Self {
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match err {
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RevlogError::IoError(err) => DebugDataErrorKind::IoError(err),
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RevlogError::UnsuportedVersion(version) => {
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DebugDataErrorKind::UnsuportedRevlogVersion(version)
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}
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RevlogError::InvalidRevision => {
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DebugDataErrorKind::InvalidRevision
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}
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RevlogError::AmbiguousPrefix => {
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DebugDataErrorKind::AmbiguousPrefix
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}
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RevlogError::Corrupted => DebugDataErrorKind::CorruptedRevlog,
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RevlogError::UnknowDataFormat(format) => {
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DebugDataErrorKind::UnknowRevlogDataFormat(format)
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}
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}
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.into()
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}
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}
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/// Dump the contents data of a revision.
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pub fn debug_data(
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repo: &Repo,
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rev: &str,
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kind: DebugDataKind,
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) -> Result<Vec<u8>, DebugDataError> {
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let index_file = match kind {
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DebugDataKind::Changelog => "00changelog.i",
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DebugDataKind::Manifest => "00manifest.i",
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};
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let revlog = Revlog::open(repo, index_file, None)?;
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let data = match rev.parse::<Revision>() {
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Ok(rev) => revlog.get_rev_data(rev)?,
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_ => {
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let node = NodePrefix::from_hex(&rev)
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.map_err(|_| DebugDataErrorKind::InvalidRevision)?;
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let rev = revlog.get_node_rev(node)?;
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revlog.get_rev_data(rev)?
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}
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};
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Ok(data)
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}
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