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-rw-r--r--storage/filesystem/dotgit/dotgit_setref.go51
-rw-r--r--storage/filesystem/dotgit/dotgit_setref_norwfs.go47
-rw-r--r--storage/filesystem/dotgit/dotgit_test.go25
3 files changed, 73 insertions, 50 deletions
diff --git a/storage/filesystem/dotgit/dotgit_setref.go b/storage/filesystem/dotgit/dotgit_setref.go
index d27c1a3..9da2f31 100644
--- a/storage/filesystem/dotgit/dotgit_setref.go
+++ b/storage/filesystem/dotgit/dotgit_setref.go
@@ -1,15 +1,24 @@
-// +build !norwfs
-
package dotgit
import (
+ "fmt"
"os"
"gopkg.in/src-d/go-git.v4/plumbing"
"gopkg.in/src-d/go-git.v4/utils/ioutil"
+
+ "gopkg.in/src-d/go-billy.v4"
)
func (d *DotGit) setRef(fileName, content string, old *plumbing.Reference) (err error) {
+ if billy.CapabilityCheck(d.fs, billy.ReadAndWriteCapability) {
+ return d.setRefRwfs(fileName, content, old)
+ }
+
+ return d.setRefNorwfs(fileName, content, old)
+}
+
+func (d *DotGit) setRefRwfs(fileName, content string, old *plumbing.Reference) (err error) {
// If we are not checking an old ref, just truncate the file.
mode := os.O_RDWR | os.O_CREATE
if old == nil {
@@ -41,3 +50,41 @@ func (d *DotGit) setRef(fileName, content string, old *plumbing.Reference) (err
_, err = f.Write([]byte(content))
return err
}
+
+// There are some filesystems that don't support opening files in RDWD mode.
+// In these filesystems the standard SetRef function can not be used as it
+// reads the reference file to check that it's not modified before updating it.
+//
+// This version of the function writes the reference without extra checks
+// making it compatible with these simple filesystems. This is usually not
+// a problem as they should be accessed by only one process at a time.
+func (d *DotGit) setRefNorwfs(fileName, content string, old *plumbing.Reference) error {
+ _, err := d.fs.Stat(fileName)
+ if err == nil && old != nil {
+ fRead, err := d.fs.Open(fileName)
+ if err != nil {
+ return err
+ }
+
+ ref, err := d.readReferenceFrom(fRead, old.Name().String())
+ fRead.Close()
+
+ if err != nil {
+ return err
+ }
+
+ if ref.Hash() != old.Hash() {
+ return fmt.Errorf("reference has changed concurrently")
+ }
+ }
+
+ f, err := d.fs.Create(fileName)
+ if err != nil {
+ return err
+ }
+
+ defer f.Close()
+
+ _, err = f.Write([]byte(content))
+ return err
+}
diff --git a/storage/filesystem/dotgit/dotgit_setref_norwfs.go b/storage/filesystem/dotgit/dotgit_setref_norwfs.go
deleted file mode 100644
index 5695bd3..0000000
--- a/storage/filesystem/dotgit/dotgit_setref_norwfs.go
+++ /dev/null
@@ -1,47 +0,0 @@
-// +build norwfs
-
-package dotgit
-
-import (
- "fmt"
-
- "gopkg.in/src-d/go-git.v4/plumbing"
-)
-
-// There are some filesystems that don't support opening files in RDWD mode.
-// In these filesystems the standard SetRef function can not be used as i
-// reads the reference file to check that it's not modified before updating it.
-//
-// This version of the function writes the reference without extra checks
-// making it compatible with these simple filesystems. This is usually not
-// a problem as they should be accessed by only one process at a time.
-func (d *DotGit) setRef(fileName, content string, old *plumbing.Reference) error {
- _, err := d.fs.Stat(fileName)
- if err == nil && old != nil {
- fRead, err := d.fs.Open(fileName)
- if err != nil {
- return err
- }
-
- ref, err := d.readReferenceFrom(fRead, old.Name().String())
- fRead.Close()
-
- if err != nil {
- return err
- }
-
- if ref.Hash() != old.Hash() {
- return fmt.Errorf("reference has changed concurrently")
- }
- }
-
- f, err := d.fs.Create(fileName)
- if err != nil {
- return err
- }
-
- defer f.Close()
-
- _, err = f.Write([]byte(content))
- return err
-}
diff --git a/storage/filesystem/dotgit/dotgit_test.go b/storage/filesystem/dotgit/dotgit_test.go
index 308c6b7..73b0291 100644
--- a/storage/filesystem/dotgit/dotgit_test.go
+++ b/storage/filesystem/dotgit/dotgit_test.go
@@ -57,11 +57,26 @@ func (s *SuiteDotGit) TestSetRefs(c *C) {
fs := osfs.New(tmp)
dir := New(fs)
+ testSetRefs(c, dir)
+}
+
+func (s *SuiteDotGit) TestSetRefsNorwfs(c *C) {
+ tmp, err := ioutil.TempDir("", "dot-git")
+ c.Assert(err, IsNil)
+ defer os.RemoveAll(tmp)
+
+ fs := osfs.New(tmp)
+ dir := New(&norwfs{fs})
+
+ testSetRefs(c, dir)
+}
+
+func testSetRefs(c *C, dir *DotGit) {
firstFoo := plumbing.NewReferenceFromStrings(
"refs/heads/foo",
"e8d3ffab552895c19b9fcf7aa264d277cde33881",
)
- err = dir.SetRef(firstFoo, nil)
+ err := dir.SetRef(firstFoo, nil)
c.Assert(err, IsNil)
@@ -795,3 +810,11 @@ func (s *SuiteDotGit) TestAlternates(c *C) {
}
c.Assert(dotgits[1].fs.Root(), Equals, expectedPath)
}
+
+type norwfs struct {
+ billy.Filesystem
+}
+
+func (f *norwfs) Capabilities() billy.Capability {
+ return billy.Capabilities(f.Filesystem) &^ billy.ReadAndWriteCapability
+}