jj/lib/tests/test_working_copy_concurrent.rs

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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
use std::cmp::max;
2021-03-14 17:37:28 +00:00
use std::collections::HashSet;
use std::thread;
use jujutsu_lib::commit_builder::CommitBuilder;
use jujutsu_lib::repo_path::RepoPath;
use jujutsu_lib::testutils;
use jujutsu_lib::working_copy::CheckoutError;
use jujutsu_lib::workspace::Workspace;
use test_case::test_case;
#[test_case(false ; "local backend")]
#[test_case(true ; "git backend")]
fn test_concurrent_checkout(use_git: bool) {
// Test that we error out if a concurrent checkout is detected (i.e. if the
// current checkout changed on disk after we read it).
let settings = testutils::user_settings();
let mut test_workspace1 = testutils::init_repo(&settings, use_git);
let repo1 = test_workspace1.repo.clone();
let workspace1_root = test_workspace1.workspace.workspace_root().clone();
let mut tx1 = repo1.start_transaction("test");
let commit1 = testutils::create_random_commit(&settings, &repo1)
.set_open(true)
.write_to_repo(tx1.mut_repo());
let commit2 = testutils::create_random_commit(&settings, &repo1)
.set_open(true)
.write_to_repo(tx1.mut_repo());
let commit3 = testutils::create_random_commit(&settings, &repo1)
.set_open(true)
.write_to_repo(tx1.mut_repo());
tx1.commit();
// Check out commit1
let wc1 = test_workspace1.workspace.working_copy_mut();
wc1.check_out(commit1).unwrap();
// Check out commit2 from another process (simulated by another workspace
// instance)
let mut workspace2 = Workspace::load(&settings, workspace1_root.clone()).unwrap();
workspace2
.working_copy_mut()
.check_out(commit2.clone())
.unwrap();
// Checking out another commit (via the first repo instance) should now fail.
assert_eq!(
wc1.check_out(commit3),
Err(CheckoutError::ConcurrentCheckout)
);
// Check that the commit2 is still checked out on disk.
let workspace3 = Workspace::load(&settings, workspace1_root).unwrap();
assert_eq!(
workspace3.working_copy().current_tree_id(),
commit2.tree().id().clone()
);
}
#[test_case(false ; "local backend")]
#[test_case(true ; "git backend")]
fn test_checkout_parallel(use_git: bool) {
// Test that concurrent checkouts by different processes (simulated by using
// different repo instances) is safe.
let settings = testutils::user_settings();
let mut test_workspace = testutils::init_repo(&settings, use_git);
let repo = &test_workspace.repo;
let store = repo.store();
let workspace_root = test_workspace.workspace.workspace_root().clone();
let num_threads = max(num_cpus::get(), 4);
let mut tree_ids = HashSet::new();
let mut commit_ids = vec![];
let mut tx = repo.start_transaction("test");
for i in 0..num_threads {
let path = RepoPath::from_internal_string(format!("file{}", i).as_str());
let tree = testutils::create_tree(repo, &[(&path, "contents")]);
tree_ids.insert(tree.id().clone());
let commit = CommitBuilder::for_new_commit(&settings, store, tree.id().clone())
.set_open(true)
.write_to_repo(tx.mut_repo());
commit_ids.push(commit.id().clone());
}
// Create another commit just so we can test the update stats reliably from the
// first update
let tree = testutils::create_tree(
repo,
&[(&RepoPath::from_internal_string("other file"), "contents")],
);
let commit = CommitBuilder::for_new_commit(&settings, store, tree.id().clone())
.set_open(true)
.write_to_repo(tx.mut_repo());
tx.commit();
test_workspace
.workspace
.working_copy_mut()
.check_out(commit)
.unwrap();
let mut threads = vec![];
for commit_id in &commit_ids {
let tree_ids = tree_ids.clone();
let commit_id = commit_id.clone();
let settings = settings.clone();
let workspace_root = workspace_root.clone();
let handle = thread::spawn(move || {
let mut workspace = Workspace::load(&settings, workspace_root).unwrap();
let commit = workspace
.repo_loader()
.store()
.get_commit(&commit_id)
.unwrap();
let stats = workspace.working_copy_mut().check_out(commit).unwrap();
assert_eq!(stats.updated_files, 0);
assert_eq!(stats.added_files, 1);
assert_eq!(stats.removed_files, 1);
// Check that the working copy contains one of the trees. We may see a
// different tree than the one we just checked out, but since
// write_tree() should take the same lock as check_out(), write_tree()
// should never produce a different tree.
let locked_wc = workspace.working_copy_mut().write_tree();
let new_tree_id = locked_wc.new_tree_id();
locked_wc.discard();
assert!(tree_ids.contains(&new_tree_id));
});
threads.push(handle);
}
for thread in threads {
thread.join().ok().unwrap();
}
}