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git: rewrite diffing of exportable branches to not re-lookup targets by name

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As we need to build a set of all branch names anyway, we can also put old/new
targets there. InvalidGitName is moved to caller since the diff function no
longer converts RefName to "refs/" string.
This commit is contained in:
Yuya Nishihara 2023-09-30 20:42:09 +09:00
parent 6f5cc2fd32
commit 7d78ef60d1
1 changed files with 51 additions and 45 deletions
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96
lib/src/git.rs
View file

@ -518,7 +518,10 @@ pub fn export_some_refs(
}
}
for (parsed_ref_name, old_oid) in branches_to_delete {
let git_ref_name = to_git_ref_name(&parsed_ref_name).unwrap();
let Some(git_ref_name) = to_git_ref_name(&parsed_ref_name) else {
failed_branches.insert(parsed_ref_name, FailedRefExportReason::InvalidGitName);
continue;
};
if let Err(reason) = delete_git_ref(git_repo, &git_ref_name, old_oid) {
failed_branches.insert(parsed_ref_name, reason);
} else {
@ -527,7 +530,10 @@ pub fn export_some_refs(
}
}
for (parsed_ref_name, (old_oid, new_oid)) in branches_to_update {
let git_ref_name = to_git_ref_name(&parsed_ref_name).unwrap();
let Some(git_ref_name) = to_git_ref_name(&parsed_ref_name) else {
failed_branches.insert(parsed_ref_name, FailedRefExportReason::InvalidGitName);
continue;
};
if let Err(reason) = update_git_ref(git_repo, &git_ref_name, old_oid, new_oid) {
failed_branches.insert(parsed_ref_name, reason);
} else {
@ -578,53 +584,53 @@ fn diff_refs_to_export(
root_commit_id: &CommitId,
git_ref_filter: impl Fn(&RefName) -> bool,
) -> RefsToExport {
// Local targets will be copied to the "git" remote if successfully exported. So
// the local branches are considered to be the new "git" remote branches.
let mut all_branch_targets: HashMap<RefName, (&RefTarget, &RefTarget)> = itertools::chain(
view.local_branches()
.map(|(branch, target)| (RefName::LocalBranch(branch.to_owned()), target)),
view.remote_branches()
.filter(|&((_, remote), _)| remote != REMOTE_NAME_FOR_LOCAL_GIT_REPO)
.map(|((branch, remote), target)| {
let ref_name = RefName::RemoteBranch {
branch: branch.to_owned(),
remote: remote.to_owned(),
};
(ref_name, target)
}),
)
.map(|(ref_name, new_target)| (ref_name, (RefTarget::absent_ref(), new_target)))
.filter(|(ref_name, _)| git_ref_filter(ref_name))
.collect();
let known_git_refs = view
.git_refs()
.iter()
.map(|(full_name, target)| {
let ref_name = parse_git_ref(full_name).expect("stored git ref should be parsable");
(ref_name, target)
})
.filter(|(ref_name, _)| {
// There are two situations where remote-tracking branches get out of sync:
// 1. `jj branch forget`
// 2. `jj op undo`/`restore` in colocated repo
matches!(
ref_name,
RefName::LocalBranch(..) | RefName::RemoteBranch { .. }
)
})
.filter(|(ref_name, _)| git_ref_filter(ref_name));
for (ref_name, target) in known_git_refs {
all_branch_targets
.entry(ref_name)
.and_modify(|(old_target, _)| *old_target = target)
.or_insert((target, RefTarget::absent_ref()));
}
let mut branches_to_update = BTreeMap::new();
let mut branches_to_delete = BTreeMap::new();
let mut failed_branches = HashMap::new();
let root_commit_target = RefTarget::normal(root_commit_id.clone());
// Local targets will be copied to the "git" remote if successfully exported. So
// the local branches are considered to be the new "git" remote branches.
let jj_repo_iter_all_branches = view.branches().iter().flat_map(|(branch, target)| {
itertools::chain(
target
.local_target
.is_present()
.then(|| RefName::LocalBranch(branch.to_owned())),
target
.remote_targets
.keys()
.filter(|&remote| remote != REMOTE_NAME_FOR_LOCAL_GIT_REPO)
.map(|remote| RefName::RemoteBranch {
branch: branch.to_string(),
remote: remote.to_string(),
}),
)
});
let all_ref_names_passing_filter: HashSet<_> = view
.git_refs()
.keys()
.filter_map(|name| parse_git_ref(name))
.chain(jj_repo_iter_all_branches)
.filter(git_ref_filter)
.collect();
for ref_name in all_ref_names_passing_filter {
let new_target = match &ref_name {
RefName::LocalBranch(branch) => view.get_local_branch(branch),
RefName::RemoteBranch { remote, branch } => {
// There are two situations where remote-tracking branches get out of sync:
// 1. `jj branch forget`
// 2. `jj op undo`/`restore` in colocated repo
view.get_remote_branch(branch, remote)
}
_ => continue,
};
let old_target = if let Some(name) = to_git_ref_name(&ref_name) {
view.get_git_ref(&name)
} else {
// Invalid branch name in Git sense
failed_branches.insert(ref_name, FailedRefExportReason::InvalidGitName);
continue;
};
for (ref_name, (old_target, new_target)) in all_branch_targets {
if new_target == old_target {
continue;
}