plumbing: transport, make target repo writeable in tests

Some tests write to an already existent repository retrieved from
fixtures. The permissions of these files are read only and make
receive pack fail. This was shadowed before as close errors were
lost.

Signed-off-by: Javi Fontan <jfontan@gmail.com>

Author: jfontan

plumbing/transport/test/receive_pack.go

@@ -8,6 +8,8 @@ import (
 	"context"
 	"io"
 	"io/ioutil"
+	"os"
+	"path/filepath"
 
 	"gopkg.in/src-d/go-git.v4/plumbing"
 	"gopkg.in/src-d/go-git.v4/plumbing/format/packfile"
@@ -225,6 +227,25 @@ func (s *ReceivePackSuite) receivePackNoCheck(c *C, ep *transport.Endpoint,
 		ep.String(), url, callAdvertisedReferences,
 	)
 
+	// Set write permissions to endpoint directory files. By default
+	// fixtures are generated with read only permissions, this casuses
+	// errors deleting or modifying files.
+	rootPath := ep.Path
+	println("STAT", rootPath)
+	stat, err := os.Stat(ep.Path)
+
+	if rootPath != "" && err == nil && stat.IsDir() {
+		objectPath := filepath.Join(rootPath, "objects/pack")
+		files, err := ioutil.ReadDir(objectPath)
+		c.Assert(err, IsNil)
+
+		for _, file := range files {
+			path := filepath.Join(objectPath, file.Name())
+			err = os.Chmod(path, 0644)
+			c.Assert(err, IsNil)
+		}
+	}
+
 	r, err := s.Client.NewReceivePackSession(ep, s.EmptyAuth)
 	c.Assert(err, IsNil, comment)
 	defer func() { c.Assert(r.Close(), IsNil, comment) }()