4 files changed, 88 insertions, 8 deletions

diff --git a/clients/common/common.go b/clients/common/common.go
index 4204cb7..d29706d 100644
--- a/clients/common/common.go
+++ b/clients/common/common.go
@@ -1,6 +1,7 @@
 package common
 
 import (
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/url"
@@ -12,6 +13,10 @@ import (
 	"gopkg.in/sourcegraph/go-vcsurl.v1"
 )
 
+var (
+	NotFoundErr = errors.New("repository not found")
+)
+
 const GitUploadPackServiceName = "git-upload-pack"
 
 type Endpoint string
@@ -19,7 +24,7 @@ type Endpoint string
 func NewEndpoint(url string) (Endpoint, error) {
 	vcs, err := vcsurl.Parse(url)
 	if err != nil {
-		return "", err
+		return "", NewPermanentError(err)
 	}
 
 	link := vcs.Link()
@@ -88,7 +93,7 @@ type GitUploadPackInfo struct {
 func NewGitUploadPackInfo(d *pktline.Decoder) (*GitUploadPackInfo, error) {
 	info := &GitUploadPackInfo{}
 	if err := info.read(d); err != nil {
-		return nil, err
+		return nil, NewUnexpectedError(err)
 	}
 
 	return info, nil
@@ -164,3 +169,35 @@ func (r *GitUploadPackRequest) Reader() *strings.Reader {
 
 	return e.Reader()
 }
+
+type PermanentError struct {
+	err error
+}
+
+func NewPermanentError(err error) *PermanentError {
+	if err == nil {
+		return nil
+	}
+
+	return &PermanentError{err: err}
+}
+
+func (e *PermanentError) Error() string {
+	return fmt.Sprintf("permanent client error: %s", e.err.Error())
+}
+
+type UnexpectedError struct {
+	err error
+}
+
+func NewUnexpectedError(err error) *UnexpectedError {
+	if err == nil {
+		return nil
+	}
+
+	return &UnexpectedError{err: err}
+}
+
+func (e *UnexpectedError) Error() string {
+	return fmt.Sprintf("unexpected client error: %s", e.err.Error())
+}
diff --git a/clients/http/common.go b/clients/http/common.go
index a0f012e..2a2808c 100644
--- a/clients/http/common.go
+++ b/clients/http/common.go
@@ -3,18 +3,25 @@ package http
 import (
 	"fmt"
 	"net/http"
+
+	"gopkg.in/src-d/go-git.v2/clients/common"
 )
 
 type HTTPError struct {
 	Response *http.Response
 }
 
-func NewHTTPError(r *http.Response) *HTTPError {
+func NewHTTPError(r *http.Response) error {
 	if r.StatusCode >= 200 && r.StatusCode < 300 {
 		return nil
 	}
 
-	return &HTTPError{r}
+	err := &HTTPError{r}
+	if r.StatusCode == 404 || r.StatusCode == 401 {
+		return common.NewPermanentError(common.NotFoundErr)
+	}
+
+	return common.NewUnexpectedError(err)
 }
 
 func (e *HTTPError) StatusCode() int {
@@ -22,7 +29,7 @@ func (e *HTTPError) StatusCode() int {
 }
 
 func (e *HTTPError) Error() string {
-	return fmt.Sprintf("Error requesting %q status code: %d",
+	return fmt.Sprintf("unexpected requesting %q status code: %d",
 		e.Response.Request.URL, e.Response.StatusCode,
 	)
 }
diff --git a/clients/http/common_test.go b/clients/http/common_test.go
index b672801..7bd9708 100644
--- a/clients/http/common_test.go
+++ b/clients/http/common_test.go
@@ -1,9 +1,45 @@
 package http
 
 import (
+	"net/http"
 	"testing"
 
 	. "gopkg.in/check.v1"
 )
 
 func Test(t *testing.T) { TestingT(t) }
+
+type SuiteCommon struct{}
+
+var _ = Suite(&SuiteCommon{})
+
+func (s *SuiteCommon) TestNewHTTPError200(c *C) {
+	res := &http.Response{StatusCode: 200}
+	res.StatusCode = 200
+	err := NewHTTPError(res)
+	c.Assert(err, IsNil)
+}
+
+func (s *SuiteCommon) TestNewHTTPError401(c *C) {
+	s.testNewHTTPError(c, 401, "permanent client error.*not found.*")
+}
+
+func (s *SuiteCommon) TestNewHTTPError404(c *C) {
+	s.testNewHTTPError(c, 404, "permanent client error.*not found.*")
+}
+
+func (s *SuiteCommon) TestNewHTTPError40x(c *C) {
+	s.testNewHTTPError(c, 402, "unexpected client error.*")
+}
+
+func (s *SuiteCommon) testNewHTTPError(c *C, code int, msg string) {
+	req, _ := http.NewRequest("GET", "foo", nil)
+	res := &http.Response{
+		StatusCode: code,
+		Request:    req,
+	}
+
+	err := NewHTTPError(res)
+	c.Assert(err, NotNil)
+	c.Assert(err, ErrorMatches, msg)
+}
diff --git a/clients/http/git_upload_pack.go b/clients/http/git_upload_pack.go
index 7e837e1..1c22dbf 100644
--- a/clients/http/git_upload_pack.go
+++ b/clients/http/git_upload_pack.go
@@ -50,7 +50,7 @@ func (s *GitUploadPackService) Fetch(r *common.GitUploadPackRequest) (io.ReadClo
 
 	h := make([]byte, 8)
 	if _, err := res.Body.Read(h); err != nil {
-		return nil, err
+		return nil, common.NewUnexpectedError(err)
 	}
 
 	return res.Body, nil
@@ -64,14 +64,14 @@ func (s *GitUploadPackService) doRequest(method, url string, content *strings.Re
 
 	req, err := http.NewRequest(method, url, body)
 	if err != nil {
-		return nil, err
+		return nil, common.NewPermanentError(err)
 	}
 
 	s.applyHeadersToRequest(req, content)
 
 	res, err := s.Client.Do(req)
 	if err != nil {
-		return nil, err
+		return nil, common.NewUnexpectedError(err)
 	}
 
 	if err := NewHTTPError(res); err != nil {