khive_vcs/
error.rs

1// Copyright 2026 khive contributors. Licensed under Apache-2.0.
2//
3//! Error types for the VCS layer.
4
5use thiserror::Error;
6
7use crate::types::SnapshotId;
8
9#[derive(Debug, Error)]
10pub enum VcsError {
11    /// A snapshot with this ID already exists in the database.
12    /// This should only occur on SHA-256 hash collision (computationally infeasible)
13    /// or if `commit()` is called twice with identical namespace state.
14    #[error("snapshot already exists: {0}")]
15    SnapshotAlreadyExists(SnapshotId),
16
17    /// The requested snapshot archive is not in the local database.
18    /// Callers must `pull` from a remote to fetch it.
19    #[error("snapshot not found: {0}")]
20    SnapshotNotFound(SnapshotId),
21
22    /// No branch with this name in the namespace.
23    #[error("branch not found: {namespace}/{name}")]
24    BranchNotFound { namespace: String, name: String },
25
26    /// The remote branch HEAD is not an ancestor of the local HEAD.
27    /// Caller must `pull`, merge, commit, then push.
28    #[error("non-fast-forward: local={local_head}, remote={remote_head}")]
29    NonFastForward {
30        local_head: SnapshotId,
31        remote_head: SnapshotId,
32    },
33
34    /// The remote khive-sync server could not be reached.
35    #[error("remote unreachable: {url} — {cause}")]
36    RemoteUnreachable { url: String, cause: String },
37
38    /// The remote rejected the request due to authentication failure.
39    #[error("authentication failed for remote: {url}")]
40    AuthFailed { url: String },
41
42    /// The archive stored at the remote has a different hash than expected.
43    /// Indicates corruption or tampering.
44    #[error("hash mismatch: expected {expected}, actual {actual}")]
45    HashMismatch {
46        expected: SnapshotId,
47        actual: SnapshotId,
48    },
49
50    /// The remote has diverged from local history; a merge is required.
51    #[error("merge required: remote history has diverged from local")]
52    MergeRequired,
53
54    /// `checkout` was blocked because there are uncommitted changes.
55    /// Pass `force: true` to discard them.
56    #[error("uncommitted changes: {count} entities/edges modified since last commit")]
57    UncommittedChanges { count: usize },
58
59    /// `merge_branch` was called but no `MergeEngine` has been registered.
60    /// Ships as the default until `khive-merge` is linked.
61    #[error("merge not implemented: link khive-merge to enable three-way merge")]
62    MergeNotImplemented,
63
64    /// A `SnapshotId` string failed validation.
65    #[error("invalid snapshot id: {0}")]
66    InvalidSnapshotId(String),
67
68    /// An underlying storage operation failed.
69    #[error("storage: {0}")]
70    Storage(String),
71
72    /// JSON serialization or deserialization failed.
73    #[error("json: {0}")]
74    Json(#[from] serde_json::Error),
75
76    /// An I/O operation failed (file system, network).
77    #[error("io: {0}")]
78    Io(#[from] std::io::Error),
79
80    /// An unexpected internal error.
81    #[error("internal: {0}")]
82    Internal(String),
83}
84
85impl From<khive_runtime::error::RuntimeError> for VcsError {
86    fn from(e: khive_runtime::error::RuntimeError) -> Self {
87        VcsError::Storage(e.to_string())
88    }
89}
khive_vcs/error.rs

khive_vcs/
error.rs
