1 files changed, 63 insertions, 0 deletions
diff --git a/format/pack/ingest/errors.go b/format/pack/ingest/errors.go
new file mode 100644
index 00000000..1fc321e7
--- /dev/null
+++ b/format/pack/ingest/errors.go
@@ -0,0 +1,63 @@
+package ingest
+
+import "fmt"
+
+// ErrInvalidPackHeader reports an invalid or unsupported pack header.
+type ErrInvalidPackHeader struct {
+	Reason string
+}
+
+// Error implements error.
+func (err *ErrInvalidPackHeader) Error() string {
+	return fmt.Sprintf("format/pack/ingest: invalid pack header: %s", err.Reason)
+}
+
+// ErrPackTrailerMismatch reports a mismatch between computed and trailer pack hash.
+type ErrPackTrailerMismatch struct{}
+
+// Error implements error.
+func (err *ErrPackTrailerMismatch) Error() string {
+	return "format/pack/ingest: pack trailer hash mismatch"
+}
+
+// ErrThinPackUnresolved reports unresolved REF deltas when fixThin is disabled
+// or when required bases cannot be found in base.
+type ErrThinPackUnresolved struct {
+	Count int
+}
+
+// Error implements error.
+func (err *ErrThinPackUnresolved) Error() string {
+	return fmt.Sprintf("format/pack/ingest: unresolved thin deltas: %d", err.Count)
+}
+
+// ErrMalformedPackEntry reports malformed entry encoding at one pack offset.
+type ErrMalformedPackEntry struct {
+	Offset uint64
+	Reason string
+}
+
+// Error implements error.
+func (err *ErrMalformedPackEntry) Error() string {
+	return fmt.Sprintf("format/pack/ingest: malformed pack entry at offset %d: %s", err.Offset, err.Reason)
+}
+
+// ErrDeltaCycle reports a detected cycle in delta dependency resolution.
+type ErrDeltaCycle struct {
+	Offset uint64
+}
+
+// Error implements error.
+func (err *ErrDeltaCycle) Error() string {
+	return fmt.Sprintf("format/pack/ingest: delta cycle detected at offset %d", err.Offset)
+}
+
+// ErrDestinationWrite reports destination I/O failures.
+type ErrDestinationWrite struct {
+	Op string
+}
+
+// Error implements error.
+func (err *ErrDestinationWrite) Error() string {
+	return fmt.Sprintf("format/pack/ingest: destination write failure: %s", err.Op)
+}