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index: don't write empty incremental index file

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This commit is contained in:
Martin von Zweigbergk 2021-02-15 10:41:10 -08:00
parent a7b6bcfd79
commit b122f33312
2 changed files with 22 additions and 22 deletions
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37
lib/src/index.rs
View file

@ -466,7 +466,11 @@ impl MutableIndex {
buf
}
pub fn save(self) -> io::Result<ReadonlyIndex> {
pub fn save(self) -> io::Result<Arc<ReadonlyIndex>> {
if self.segment_num_commits() == 0 && self.parent_file.is_some() {
return Ok(self.parent_file.unwrap());
}
let hash_length = self.hash_length;
let dir = self.dir.clone();
let buf = self.serialize();
@ -1064,15 +1068,13 @@ impl ReadonlyIndex {
pub fn load(repo: &ReadonlyRepo, dir: PathBuf, op_id: OperationId) -> Arc<ReadonlyIndex> {
let op_id_hex = op_id.hex();
let op_id_file = dir.join("operations").join(&op_id_hex);
let index_file = if op_id_file.exists() {
if op_id_file.exists() {
let op_id = OperationId(hex::decode(op_id_hex).unwrap());
ReadonlyIndex::load_at_operation(dir, repo.store().hash_length(), &op_id).unwrap()
} else {
let op = repo.view().as_view_ref().get_operation(&op_id).unwrap();
ReadonlyIndex::index(repo.store(), dir, &op).unwrap()
};
Arc::new(index_file)
}
}
fn load_from(
@ -1080,7 +1082,7 @@ impl ReadonlyIndex {
dir: PathBuf,
name: String,
hash_length: usize,
) -> io::Result<ReadonlyIndex> {
) -> io::Result<Arc<ReadonlyIndex>> {
let parent_filename_len = file.read_u32::<LittleEndian>()?;
let num_parent_commits;
let maybe_parent_file;
@ -1097,7 +1099,7 @@ impl ReadonlyIndex {
hash_length,
)?;
num_parent_commits = parent_file.num_parent_commits + parent_file.num_local_commits;
maybe_parent_file = Some(Arc::new(parent_file));
maybe_parent_file = Some(parent_file);
} else {
num_parent_commits = 0;
maybe_parent_file = None;
@ -1116,7 +1118,7 @@ impl ReadonlyIndex {
let overflow_parent = data.split_off(graph_size + lookup_size);
let lookup = data.split_off(graph_size);
let graph = data;
Ok(ReadonlyIndex {
Ok(Arc::new(ReadonlyIndex {
dir,
parent_file: maybe_parent_file,
num_parent_commits,
@ -1128,14 +1130,14 @@ impl ReadonlyIndex {
graph,
lookup,
overflow_parent,
})
}))
}
fn load_at_operation(
dir: PathBuf,
hash_length: usize,
op_id: &OperationId,
) -> io::Result<ReadonlyIndex> {
) -> io::Result<Arc<ReadonlyIndex>> {
let op_id_file = dir.join("operations").join(op_id.hex());
let mut buf = vec![];
File::open(op_id_file)
@ -1152,7 +1154,7 @@ impl ReadonlyIndex {
store: &StoreWrapper,
dir: PathBuf,
operation: &Operation,
) -> io::Result<ReadonlyIndex> {
) -> io::Result<Arc<ReadonlyIndex>> {
let view = operation.view();
let operations_dir = dir.join("operations");
let hash_length = store.hash_length();
@ -1181,9 +1183,8 @@ impl ReadonlyIndex {
data = MutableIndex::full(dir, hash_length);
}
Some(parent_op_id) => {
let parent_file = Arc::new(
ReadonlyIndex::load_at_operation(dir, hash_length, &parent_op_id).unwrap(),
);
let parent_file =
ReadonlyIndex::load_at_operation(dir, hash_length, &parent_op_id).unwrap();
maybe_parent_file = Some(parent_file.clone());
data = MutableIndex::incremental(parent_file)
}
@ -1331,7 +1332,7 @@ mod tests {
let temp_dir = tempfile::tempdir().unwrap();
let index = MutableIndex::full(temp_dir.path().to_owned(), 3);
let index = if use_file {
IndexRef::Readonly(Arc::new(index.save().unwrap()))
IndexRef::Readonly(index.save().unwrap())
} else {
IndexRef::Mutable(&index)
};
@ -1357,7 +1358,7 @@ mod tests {
let id_0 = CommitId::from_hex("000000");
index.add_commit_data(id_0.clone(), vec![]);
let index = if use_file {
IndexRef::Readonly(Arc::new(index.save().unwrap()))
IndexRef::Readonly(index.save().unwrap())
} else {
IndexRef::Mutable(&index)
};
@ -1419,7 +1420,7 @@ mod tests {
// If testing incremental indexing, write the first three commits to one file
// now and build the remainder as another segment on top.
if incremental {
let initial_file = Arc::new(index.save().unwrap());
let initial_file = index.save().unwrap();
index = MutableIndex::incremental(initial_file);
}
@ -1427,7 +1428,7 @@ mod tests {
index.add_commit_data(id_4.clone(), vec![id_1.clone()]);
index.add_commit_data(id_5.clone(), vec![id_4.clone(), id_2.clone()]);
let index = if use_file {
IndexRef::Readonly(Arc::new(index.save().unwrap()))
IndexRef::Readonly(index.save().unwrap())
} else {
IndexRef::Mutable(&index)
};

7
lib/tests/test_index.rs
View file

@ -386,10 +386,9 @@ fn test_index_commits_incremental_empty_transaction(use_git: bool) {
assert_eq!(stats.num_commits, 2 + 1);
assert_eq!(stats.num_merges, 0);
assert_eq!(stats.max_generation_number, 1);
assert_eq!(stats.levels.len(), 3);
assert_eq!(stats.levels[0].num_commits, 0);
assert_eq!(stats.levels[1].num_commits, 1);
assert_eq!(stats.levels[2].num_commits, 2);
assert_eq!(stats.levels.len(), 2);
assert_eq!(stats.levels[0].num_commits, 1);
assert_eq!(stats.levels[1].num_commits, 2);
assert_eq!(generation_number(index.clone(), root_commit.id()), 0);
assert_eq!(generation_number(index.clone(), commit_a.id()), 1);