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git_backend: return error when told to write commit without parents

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There should be no other commits than the root commit without parents.
This commit is contained in:
Martin von Zweigbergk 2023-02-05 22:06:05 -08:00 committed by Martin von Zweigbergk
parent 8c63fbc4ed
commit f4374086b3
1 changed files with 14 additions and 2 deletions
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16
lib/src/git_backend.rs
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@ -453,6 +453,11 @@ impl Backend for GitBackend {
let author = signature_to_git(&contents.author);
let mut committer = signature_to_git(&contents.committer);
let message = &contents.description;
if contents.parents.is_empty() {
return Err(BackendError::Other(
"Cannot write a commit with no parents".to_string(),
));
}
let mut parents = vec![];
for parent_id in &contents.parents {
if *parent_id == self.root_commit_id {
@ -735,6 +740,13 @@ mod tests {
committer: create_signature(),
};
// No parents
commit.parents = vec![];
assert_matches!(
backend.write_commit(&commit),
Err(BackendError::Other(message)) if message.contains("no parents")
);
// Only root commit as parent
commit.parents = vec![backend.root_commit_id().clone()];
let first_id = backend.write_commit(&commit).unwrap();
@ -786,7 +798,7 @@ mod tests {
},
};
let commit = Commit {
parents: vec![],
parents: vec![store.root_commit_id().clone()],
predecessors: vec![],
root_tree: store.empty_tree_id().clone(),
change_id: ChangeId::new(vec![]),
@ -810,7 +822,7 @@ mod tests {
let temp_dir = testutils::new_temp_dir();
let store = GitBackend::init_internal(temp_dir.path());
let commit1 = Commit {
parents: vec![],
parents: vec![store.root_commit_id().clone()],
predecessors: vec![],
root_tree: store.empty_tree_id().clone(),
change_id: ChangeId::new(vec![]),