Move installable packages to pkg

Still leaves some intermediate repos in `base/`

See #1266

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

pkg/binfmt/main.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"path/filepath"
+	"syscall"
+)
+
+var (
+	dir   string
+	mount string
+)
+
+func init() {
+	flag.StringVar(&dir, "dir", "/etc/binfmt.d", "directory with config files")
+	flag.StringVar(&mount, "mount", "/proc/sys/fs/binfmt_misc", "binfmt_misc mount point")
+}
+
+func binfmt(line []byte) error {
+	register := filepath.Join(mount, "register")
+	file, err := os.OpenFile(register, os.O_WRONLY, 0)
+	if err != nil {
+		e, ok := err.(*os.PathError)
+		if ok && e.Err == syscall.ENOENT {
+			return fmt.Errorf("ENOENT opening %s is it mounted?", register)
+		}
+		if ok && e.Err == syscall.EPERM {
+			return fmt.Errorf("EPERM opening %s check permissions?", register)
+		}
+		return fmt.Errorf("Cannot open %s: %s", register, err)
+	}
+	defer file.Close()
+	// short writes should not occur on sysfs, cannot usefully recover
+	_, err = file.Write(line)
+	if err != nil {
+		e, ok := err.(*os.PathError)
+		if ok && e.Err == syscall.EEXIST {
+			// clear existing entry
+			split := bytes.SplitN(line[1:], []byte(":"), 2)
+			if len(split) == 0 {
+				return fmt.Errorf("Cannot determine arch from: %s", line)
+			}
+			arch := filepath.Join(mount, string(split[0]))
+			clear, err := os.OpenFile(arch, os.O_WRONLY, 0)
+			if err != nil {
+				return fmt.Errorf("Cannot open %s: %s", arch, err)
+			}
+			defer clear.Close()
+			_, err = clear.Write([]byte("-1"))
+			if err != nil {
+				return fmt.Errorf("Cannot write to %s: %s", arch, err)
+			}
+			_, err = file.Write(line)
+			if err != nil {
+				return fmt.Errorf("Cannot write to %s: %s", register, err)
+			}
+			return nil
+		}
+		return fmt.Errorf("Cannot write to %s: %s", register, err)
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+
+	files, err := ioutil.ReadDir(dir)
+	if err != nil {
+		log.Fatalf("Cannot read directory %s: %s", dir, err)
+	}
+
+	for _, file := range files {
+		contents, err := ioutil.ReadFile(filepath.Join(dir, file.Name()))
+		if err != nil {
+			log.Fatalf("Cannot read file %s: %s", file.Name(), err)
+		}
+		lines := bytes.Split(contents, []byte("\n"))
+		for _, line := range lines {
+			if len(line) == 0 {
+				continue
+			}
+			err = binfmt(line)
+			if err != nil {
+				log.Fatal(err)
+			}
+		}
+	}
+}