make docker compile on freebsd

Signed-off-by: Alexey Guskov <lexag@mail.ru>

directory/directory_unix.go

@@ -1,4 +1,4 @@
-// +build linux
+// +build linux freebsd
 
 package directory
 

parsers/operatingsystem/operatingsystem_freebsd.go

@@ -0,0 +1,18 @@
+package operatingsystem
+
+import (
+	"errors"
+)
+
+// GetOperatingSystem gets the name of the current operating system.
+func GetOperatingSystem() (string, error) {
+	// TODO: Implement OS detection
+	return "", errors.New("Cannot detect OS version")
+}
+
+// IsContainerized returns true if we are running inside a container.
+// No-op on FreeBSD, always returns false.
+func IsContainerized() (bool, error) {
+	// TODO: Implement jail detection
+	return false, errors.New("Cannot detect if we are in container")
+}

reexec/command_freebsd.go

@@ -0,0 +1,23 @@
+// +build freebsd
+
+package reexec
+
+import (
+	"os/exec"
+)
+
+// Self returns the path to the current process's binary.
+// Uses os.Args[0].
+func Self() string {
+	return naiveSelf()
+}
+
+// Command returns *exec.Cmd which have Path as current binary.
+// For example if current binary is "docker" at "/usr/bin/", then cmd.Path will
+// be set to "/usr/bin/docker".
+func Command(args ...string) *exec.Cmd {
+	return &exec.Cmd{
+		Path: Self(),
+		Args: args,
+	}
+}

reexec/command_unsupported.go

@@ -1,4 +1,4 @@
-// +build !linux,!windows
+// +build !linux,!windows,!freebsd
 
 package reexec
 

sockets/unix_socket.go

@@ -1,4 +1,4 @@
-// +build linux
+// +build linux freebsd
 
 package sockets
 

sysinfo/sysinfo_freebsd.go

@@ -0,0 +1,7 @@
+package sysinfo
+
+// TODO FreeBSD
+func New(quiet bool) *SysInfo {
+	sysInfo := &SysInfo{}
+	return sysInfo
+}

system/stat_freebsd.go

@@ -0,0 +1,27 @@
+package system
+
+import (
+	"syscall"
+)
+
+// fromStatT converts a syscall.Stat_t type to a system.Stat_t type
+func fromStatT(s *syscall.Stat_t) (*Stat_t, error) {
+	return &Stat_t{size: s.Size,
+		mode: uint32(s.Mode),
+		uid:  s.Uid,
+		gid:  s.Gid,
+		rdev: uint64(s.Rdev),
+		mtim: s.Mtimespec}, nil
+}
+
+// Stat takes a path to a file and returns
+// a system.Stat_t type pertaining to that file.
+//
+// Throws an error if the file does not exist
+func Stat(path string) (*Stat_t, error) {
+	s := &syscall.Stat_t{}
+	if err := syscall.Stat(path, s); err != nil {
+		return nil, err
+	}
+	return fromStatT(s)
+}

system/stat_unsupported.go

@@ -1,4 +1,4 @@
-// +build !linux,!windows
+// +build !linux,!windows,!freebsd
 
 package system