1 files changed, 48 insertions, 0 deletions
diff --git a/forged/internal/git2c/perror.go b/forged/internal/git2c/perror.go
new file mode 100644
index 0000000..96bffd5
--- /dev/null
+++ b/forged/internal/git2c/perror.go
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: AGPL-3.0-only
+// SPDX-FileCopyrightText: Copyright (c) 2025 Runxi Yu <https://runxiyu.org>
+
+// TODO: Make the C part report detailed error messages too
+
+package git2c
+
+import "errors"
+
+var (
+	Success            error
+	ErrUnknown         = errors.New("git2c: unknown error")
+	ErrPath            = errors.New("git2c: get tree entry by path failed")
+	ErrRevparse        = errors.New("git2c: revparse failed")
+	ErrReadme          = errors.New("git2c: no readme")
+	ErrBlobExpected    = errors.New("git2c: blob expected")
+	ErrEntryToObject   = errors.New("git2c: tree entry to object conversion failed")
+	ErrBlobRawContent  = errors.New("git2c: get blob raw content failed")
+	ErrRevwalk         = errors.New("git2c: revwalk failed")
+	ErrRevwalkPushHead = errors.New("git2c: revwalk push head failed")
+	ErrBareProto       = errors.New("git2c: bare protocol error")
+)
+
+func Perror(errno uint) error {
+	switch errno {
+	case 0:
+		return Success
+	case 3:
+		return ErrPath
+	case 4:
+		return ErrRevparse
+	case 5:
+		return ErrReadme
+	case 6:
+		return ErrBlobExpected
+	case 7:
+		return ErrEntryToObject
+	case 8:
+		return ErrBlobRawContent
+	case 9:
+		return ErrRevwalk
+	case 10:
+		return ErrRevwalkPushHead
+	case 11:
+		return ErrBareProto
+	}
+	return ErrUnknown
+}