Package repository, first version.

debian/repository.go

@@ -0,0 +1,37 @@
+package debian
+
+import (
+	"fmt"
+	"path/filepath"
+	"strings"
+)
+
+// Repository abstract file system with package pool and published package repos
+type Repository struct {
+	RootPath string
+}
+
+// NewRepository creates new instance of repository which specified root
+func NewRepository(root string) *Repository {
+	return &Repository{RootPath: root}
+}
+
+// PoolPath returns full path to package file in pool
+//
+// PoolPath checks that final path doesn't go out of repository root path
+func (r *Repository) PoolPath(filename string) (string, error) {
+	filename = filepath.Clean(filename)
+	if strings.HasPrefix(filename, ".") {
+		return "", fmt.Errorf("filename %s starts with dot", filename)
+	}
+
+	if filepath.IsAbs(filename) {
+		return "", fmt.Errorf("absolute filename %s not supported", filename)
+	}
+
+	if strings.HasPrefix(filename, "pool/") {
+		filename = filename[5:]
+	}
+
+	return filepath.Join(r.RootPath, "pool", filename), nil
+}

debian/repository_test.go

@@ -0,0 +1,39 @@
+package debian
+
+import (
+	. "launchpad.net/gocheck"
+	"path/filepath"
+)
+
+type RepositorySuite struct {
+	repo *Repository
+}
+
+var _ = Suite(&RepositorySuite{})
+
+func (s *RepositorySuite) SetUpTest(c *C) {
+	s.repo = NewRepository(c.MkDir())
+}
+
+func (s *RepositorySuite) TestPoolPath(c *C) {
+	path, err := s.repo.PoolPath("a/b/package.deb")
+	c.Assert(err, IsNil)
+	c.Assert(path, Equals, filepath.Join(s.repo.RootPath, "pool", "a/b/package.deb"))
+
+	path, err = s.repo.PoolPath("pool/a/b/package.deb")
+	c.Assert(err, IsNil)
+	c.Assert(path, Equals, filepath.Join(s.repo.RootPath, "pool", "a/b/package.deb"))
+
+	_, err = s.repo.PoolPath("/dev/stdin")
+	c.Assert(err, ErrorMatches, "absolute filename.*")
+
+	_, err = s.repo.PoolPath("../../../etc/passwd")
+	c.Assert(err, ErrorMatches, ".*starts with dot")
+
+	_, err = s.repo.PoolPath("pool/a/../../../etc/passwd")
+	c.Assert(err, ErrorMatches, ".*starts with dot")
+
+	path, err = s.repo.PoolPath("./etc/passwd")
+	c.Assert(err, IsNil)
+	c.Assert(path, Equals, filepath.Join(s.repo.RootPath, "pool", "etc/passwd"))
+}