Add support for illumos/Solaris

This does come without xattr/fuse support at this point.

NB: not hooking up the integration tests as restic won't compile without
    cgo with Go < 1.10.

changelog/0.8.3_2018-02-26/pull-1649

@@ -0,0 +1,3 @@
+Enhancement: Add illumos/Solaris support.
+
+https://github.com/restic/restic/pull/1649

cmd/restic/cmd_mount.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package main

cmd/restic/integration_fuse_test.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package main

doc/050_restore.rst

@@ -63,7 +63,8 @@ command to serve the repository with FUSE:
     Now serving /tmp/backup at /mnt/restic
     Don't forget to umount after quitting!
 
-Mounting repositories via FUSE is not possible on Windows and OpenBSD.
+Mounting repositories via FUSE is not possible on OpenBSD, Solaris/illumos
+and Windows.
 
 Restic supports storage and preservation of hard links. However, since
 hard links exist in the scope of a filesystem by definition, restoring

internal/backend/sftp/foreground_solaris.go

@@ -0,0 +1,25 @@
+package sftp
+
+import (
+	"os/exec"
+	"syscall"
+
+	"github.com/restic/restic/internal/errors"
+)
+
+func startForeground(cmd *exec.Cmd) (bg func() error, err error) {
+	// run the command in it's own process group so that SIGINT
+	// is not sent to it.
+	cmd.SysProcAttr = &syscall.SysProcAttr{
+		Setpgid: true,
+	}
+
+	// start the process
+	err = cmd.Start()
+	if err != nil {
+		return nil, errors.Wrap(err, "cmd.Start")
+	}
+
+	bg = func() error { return nil }
+	return bg, nil
+}

internal/backend/sftp/foreground_unix.go

@@ -1,3 +1,4 @@
+// +build !solaris
 // +build !windows
 
 package sftp

internal/fuse/blob_size_cache.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/dir.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/file.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/file_test.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/link.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/meta_dir.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/other.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/root.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/fuse/snapshots_dir.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package fuse

internal/restic/node_solaris.go

@@ -0,0 +1,27 @@
+package restic
+
+import "syscall"
+
+func (node Node) restoreSymlinkTimestamps(path string, utimes [2]syscall.Timespec) error {
+	return nil
+}
+
+func (s statUnix) atim() syscall.Timespec { return s.Atim }
+func (s statUnix) mtim() syscall.Timespec { return s.Mtim }
+func (s statUnix) ctim() syscall.Timespec { return s.Ctim }
+
+// Getxattr retrieves extended attribute data associated with path.
+func Getxattr(path, name string) ([]byte, error) {
+	return nil, nil
+}
+
+// Listxattr retrieves a list of names of extended attributes associated with the
+// given path in the file system.
+func Listxattr(path string) ([]string, error) {
+	return nil, nil
+}
+
+// Setxattr associates name and data together as an attribute of path.
+func Setxattr(path, name string, data []byte) error {
+	return nil
+}

internal/restic/node_xattr.go

@@ -1,4 +1,5 @@
 // +build !openbsd
+// +build !solaris
 // +build !windows
 
 package restic

internal/restic/progress_unix.go

@@ -1,4 +1,4 @@
-// +build !windows,!darwin,!freebsd,!netbsd,!openbsd,!dragonfly
+// +build !windows,!darwin,!freebsd,!netbsd,!openbsd,!dragonfly,!solaris
 
 package restic