cleanup: move packages to top level, change vanity URL

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

solver/fs.go

@@ -0,0 +1,104 @@
+package solver
+
+import (
+	"context"
+	"errors"
+	"io/fs"
+	"time"
+
+	bkgw "github.com/moby/buildkit/frontend/gateway/client"
+	fstypes "github.com/tonistiigi/fsutil/types"
+)
+
+// BuildkitFS is a io/fs.FS adapter for Buildkit
+// BuildkitFS implements the ReadFileFS, StatFS and ReadDirFS interfaces.
+type BuildkitFS struct {
+	ref bkgw.Reference
+}
+
+func NewBuildkitFS(ref bkgw.Reference) *BuildkitFS {
+	return &BuildkitFS{
+		ref: ref,
+	}
+}
+
+// Open is not supported.
+func (f *BuildkitFS) Open(name string) (fs.File, error) {
+	return nil, errors.New("not implemented")
+}
+
+func (f *BuildkitFS) Stat(name string) (fs.FileInfo, error) {
+	st, err := f.ref.StatFile(context.TODO(), bkgw.StatRequest{
+		Path: name,
+	})
+	if err != nil {
+		return nil, err
+	}
+	return bkFileInfo{st}, nil
+}
+
+func (f *BuildkitFS) ReadDir(name string) ([]fs.DirEntry, error) {
+	entries, err := f.ref.ReadDir(context.TODO(), bkgw.ReadDirRequest{
+		Path: name,
+	})
+	if err != nil {
+		return nil, err
+	}
+	res := make([]fs.DirEntry, 0, len(entries))
+	for _, st := range entries {
+		res = append(res, bkDirEntry{
+			bkFileInfo: bkFileInfo{
+				st: st,
+			},
+		})
+	}
+	return res, nil
+}
+
+func (f *BuildkitFS) ReadFile(name string) ([]byte, error) {
+	return f.ref.ReadFile(context.TODO(), bkgw.ReadRequest{
+		Filename: name,
+	})
+}
+
+// bkFileInfo is a fs.FileInfo adapter for fstypes.Stat
+type bkFileInfo struct {
+	st *fstypes.Stat
+}
+
+func (s bkFileInfo) Name() string {
+	return s.st.GetPath()
+}
+
+func (s bkFileInfo) Size() int64 {
+	return s.st.GetSize_()
+}
+
+func (s bkFileInfo) IsDir() bool {
+	return s.st.IsDir()
+}
+
+func (s bkFileInfo) ModTime() time.Time {
+	return time.Unix(s.st.GetModTime(), 0)
+}
+
+func (s bkFileInfo) Mode() fs.FileMode {
+	return fs.FileMode(s.st.Mode)
+}
+
+func (s bkFileInfo) Sys() interface{} {
+	return s.st
+}
+
+// bkDirEntry is a fs.DirEntry adapter for fstypes.Stat
+type bkDirEntry struct {
+	bkFileInfo
+}
+
+func (s bkDirEntry) Info() (fs.FileInfo, error) {
+	return s.bkFileInfo, nil
+}
+
+func (s bkDirEntry) Type() fs.FileMode {
+	return s.Mode()
+}