Final round of updates, everything except mirror download should be ready

files/package_pool.go

@@ -164,7 +164,7 @@ func (pool *PackagePool) Import(srcPath, basename string, checksums *utils.Check
 		}
 
 		// trying to overwrite file?
-		return "", fmt.Errorf("unable to import into pool: file %s already exists", poolPath)
+		return "", fmt.Errorf("unable to import into pool: file %s already exists", fullPoolPath)
 	}
 
 	if pool.supportLegacyPaths {
@@ -254,6 +254,18 @@ func (pool *PackagePool) Link(path, dstPath string) error {
 	return os.Link(filepath.Join(pool.rootPath, path), dstPath)
 }
 
+// Symlink generates symlink to destination path
+func (pool *PackagePool) Symlink(path, dstPath string) error {
+	return os.Symlink(filepath.Join(pool.rootPath, path), dstPath)
+}
+
+// FullPath generates full path to the file in pool
+//
+// Please use with care: it's not supposed to be used to access files
+func (pool *PackagePool) FullPath(path string) string {
+	return filepath.Join(pool.rootPath, path)
+}
+
 // GenerateTempPath generates temporary path for download (which is fast to import into package pool later on)
 func (pool *PackagePool) GenerateTempPath(filename string) (string, error) {
 	random := uuid.NewRandom().String()

files/package_pool_test.go

@@ -189,6 +189,24 @@ func (s *PackagePoolSuite) TestLink(c *C) {
 	c.Check(info.Sys().(*syscall.Stat_t).Nlink > 2, Equals, true)
 }
 
+func (s *PackagePoolSuite) TestSymlink(c *C) {
+	path, err := s.pool.Import(s.debFile, filepath.Base(s.debFile), &s.checksum, false)
+	c.Check(err, IsNil)
+
+	tmpDir := c.MkDir()
+	dstPath := filepath.Join(tmpDir, filepath.Base(s.debFile))
+	c.Check(s.pool.Symlink(path, dstPath), IsNil)
+
+	info, err := os.Stat(dstPath)
+	c.Assert(err, IsNil)
+	c.Check(info.Size(), Equals, int64(2738))
+	c.Check(info.Sys().(*syscall.Stat_t).Nlink > 2, Equals, true)
+
+	info, err = os.Lstat(dstPath)
+	c.Assert(err, IsNil)
+	c.Check(info.Sys().(*syscall.Stat_t).Mode&syscall.S_IFMT, Equals, uint16(syscall.S_IFLNK))
+}
+
 func (s *PackagePoolSuite) TestGenerateRandomPath(c *C) {
 	path, err := s.pool.GenerateTempPath("a.deb")
 	c.Check(err, IsNil)