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-rw-r--r--plumbing/format/pktline/error.go51
1 files changed, 51 insertions, 0 deletions
diff --git a/plumbing/format/pktline/error.go b/plumbing/format/pktline/error.go
new file mode 100644
index 0000000..2c0e5a7
--- /dev/null
+++ b/plumbing/format/pktline/error.go
@@ -0,0 +1,51 @@
+package pktline
+
+import (
+ "bytes"
+ "errors"
+ "io"
+ "strings"
+)
+
+var (
+ // ErrInvalidErrorLine is returned by Decode when the packet line is not an
+ // error line.
+ ErrInvalidErrorLine = errors.New("expected an error-line")
+
+ errPrefix = []byte("ERR ")
+)
+
+// ErrorLine is a packet line that contains an error message.
+// Once this packet is sent by client or server, the data transfer process is
+// terminated.
+// See https://git-scm.com/docs/pack-protocol#_pkt_line_format
+type ErrorLine struct {
+ Text string
+}
+
+// Error implements the error interface.
+func (e *ErrorLine) Error() string {
+ return e.Text
+}
+
+// Encode encodes the ErrorLine into a packet line.
+func (e *ErrorLine) Encode(w io.Writer) error {
+ p := NewEncoder(w)
+ return p.Encodef("%s%s\n", string(errPrefix), e.Text)
+}
+
+// Decode decodes a packet line into an ErrorLine.
+func (e *ErrorLine) Decode(r io.Reader) error {
+ s := NewScanner(r)
+ if !s.Scan() {
+ return s.Err()
+ }
+
+ line := s.Bytes()
+ if !bytes.HasPrefix(line, errPrefix) {
+ return ErrInvalidErrorLine
+ }
+
+ e.Text = strings.TrimSpace(string(line[4:]))
+ return nil
+}