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Description: archive/tar: fix writing of pax headers
Author: Cristian Staretu <unclejacksons@gmail.com>
Last-Update: 2014-07-16
Forwarded: not-needed
Origin: vendor, https://code.google.com/p/go/source/detail?r=1b17b3426e3c281a973d2d7bbf235b936d6a0942
---
diff -r 278365dff593 -r 1b17b3426e3c src/pkg/archive/tar/writer.go
--- a/src/pkg/archive/tar/writer.go
+++ b/src/pkg/archive/tar/writer.go
@@ -39,7 +39,8 @@
closed bool
usedBinary bool // whether the binary numeric field extension was used
preferPax bool // use pax header instead of binary numeric header
- hdrBuff [blockSize]byte // buffer to use in writeHeader
+ hdrBuff [blockSize]byte // buffer to use in writeHeader when writing a regular header
+ paxHdrBuff [blockSize]byte // buffer to use in writeHeader when writing a pax header
}
// NewWriter creates a new Writer writing to w.
@@ -161,7 +162,17 @@
// subsecond time resolution, but for now let's just capture
// too long fields or non ascii characters
- header := tw.hdrBuff[:]
+ var header []byte
+
+ // We need to select which scratch buffer to use carefully,
+ // since this method is called recursively to write PAX headers.
+ // If allowPax is true, this is the non-recursive call, and we will use hdrBuff.
+ // If allowPax is false, we are being called by writePAXHeader, and hdrBuff is
+ // already being used by the non-recursive call, so we must use paxHdrBuff.
+ header = tw.hdrBuff[:]
+ if !allowPax {
+ header = tw.paxHdrBuff[:]
+ }
copy(header, zeroBlock)
s := slicer(header)
diff -r 278365dff593 -r 1b17b3426e3c src/pkg/archive/tar/writer_test.go
--- a/src/pkg/archive/tar/writer_test.go
+++ b/src/pkg/archive/tar/writer_test.go
@@ -454,3 +454,38 @@
t.Fatal("Couldn't recover long name")
}
}
+
+func TestValidTypeflagWithPAXHeader(t *testing.T) {
+ var buffer bytes.Buffer
+ tw := NewWriter(&buffer)
+
+ fileName := strings.Repeat("ab", 100)
+
+ hdr := &Header{
+ Name: fileName,
+ Size: 4,
+ Typeflag: 0,
+ }
+ if err := tw.WriteHeader(hdr); err != nil {
+ t.Fatalf("Failed to write header: %s", err)
+ }
+ if _, err := tw.Write([]byte("fooo")); err != nil {
+ t.Fatalf("Failed to write the file's data: %s", err)
+ }
+ tw.Close()
+
+ tr := NewReader(&buffer)
+
+ for {
+ header, err := tr.Next()
+ if err == io.EOF {
+ break
+ }
+ if err != nil {
+ t.Fatalf("Failed to read header: %s", err)
+ }
+ if header.Typeflag != 0 {
+ t.Fatalf("Typeflag should've been 0, found %d", header.Typeflag)
+ }
+ }
+}
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