3 files changed, 9 insertions, 13 deletions
diff --git a/object/commit/append.go b/object/commit/append.go
index 8da33383..2bc00573 100644
--- a/object/commit/append.go
+++ b/object/commit/append.go
@@ -1,7 +1,6 @@
 package commit
 
 import (
-	"errors"
 	"fmt"
 
 	"codeberg.org/lindenii/furgit/object/header"
@@ -10,10 +9,6 @@ import (
 
 // AppendWithoutHeader renders the raw commit body bytes.
 func (commit *Commit) AppendWithoutHeader(dst []byte) ([]byte, error) {
-	if commit.Tree.Algorithm().Size() == 0 {
-		return dst, errors.New("object: commit: missing tree id")
-	}
-
 	dst = fmt.Appendf(dst, "tree %s\n", commit.Tree.String())
 
 	for _, parent := range commit.Parents {
@@ -35,9 +30,7 @@ func (commit *Commit) AppendWithoutHeader(dst []byte) ([]byte, error) {
 	}
 
 	for _, h := range commit.ExtraHeaders {
-		if h.Key == "" {
-			return dst, errors.New("object: commit: extra header has empty key")
-		}
+		// GIGO on empty keys and such.
 
 		dst = append(dst, []byte(h.Key)...)
 		dst = append(dst, byte(' '))
diff --git a/object/commit/parse.go b/object/commit/parse.go
index d0257003..1198665b 100644
--- a/object/commit/parse.go
+++ b/object/commit/parse.go
@@ -9,6 +9,9 @@ import (
 	"codeberg.org/lindenii/furgit/object/signature"
 )
 
+// ErrInvalidCommit indicates an attempt to parse an invalid commit.
+var ErrInvalidCommit = errors.New("object/commit: invalid commit")
+
 // Parse decodes a commit object body.
 func Parse(body []byte, algo id.Algorithm) (*Commit, error) {
 	c := new(Commit)
@@ -17,7 +20,7 @@ func Parse(body []byte, algo id.Algorithm) (*Commit, error) {
 	for i < len(body) {
 		rel := bytes.IndexByte(body[i:], '\n')
 		if rel < 0 {
-			return nil, errors.New("object: commit: missing newline")
+			return nil, ErrInvalidCommit
 		}
 
 		line := body[i : i+rel]
@@ -29,7 +32,7 @@ func Parse(body []byte, algo id.Algorithm) (*Commit, error) {
 
 		key, value, found := bytes.Cut(line, []byte{' '})
 		if !found {
-			return nil, errors.New("object: commit: malformed header")
+			return nil, ErrInvalidCommit
 		}
 
 		switch string(key) {
@@ -67,7 +70,7 @@ func Parse(body []byte, algo id.Algorithm) (*Commit, error) {
 			for i < len(body) {
 				nextRel := bytes.IndexByte(body[i:], '\n')
 				if nextRel < 0 {
-					return nil, errors.New("object: commit: unterminated gpgsig")
+					return nil, ErrInvalidCommit
 				}
 
 				if body[i] != ' ' {
@@ -85,7 +88,7 @@ func Parse(body []byte, algo id.Algorithm) (*Commit, error) {
 	}
 
 	if i > len(body) {
-		return nil, errors.New("object: commit: parser position out of bounds")
+		return nil, ErrInvalidCommit
 	}
 
 	c.Message = append([]byte(nil), body[i:]...)
diff --git a/object/signature/parse.go b/object/signature/parse.go
index 05bc0dd9..30cb1866 100644
--- a/object/signature/parse.go
+++ b/object/signature/parse.go
@@ -9,7 +9,7 @@ import (
 )
 
 // ErrInvalidSignature indicates an attempt to parse an invalid signature.
-var ErrInvalidSignature = errors.New("object: signature: invalid signature")
+var ErrInvalidSignature = errors.New("object/signature: invalid signature")
 
 // Parse parses a canonical Git signature line.
 //