github.com/rkt/rkt@v1.30.1-0.20200224141603-171c416fac02/pkg/fs/mount_linux.go (about)

     1  // Copyright 2016 The rkt Authors
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //+build linux
    16  
    17  package fs
    18  
    19  import (
    20  	"strings"
    21  	"syscall"
    22  )
    23  
    24  // String returns a human readable representation of mountFlags based on which bits are set.
    25  // E.g. for a value of syscall.MS_RDONLY|syscall.MS_BIND it will print "MS_RDONLY|MS_BIND"
    26  func (f mountFlags) String() string {
    27  	var s []string
    28  
    29  	maybeAppendFlag := func(ff uintptr, desc string) {
    30  		if uintptr(f)&ff != 0 {
    31  			s = append(s, desc)
    32  		}
    33  	}
    34  
    35  	maybeAppendFlag(syscall.MS_DIRSYNC, "MS_DIRSYNC")
    36  	maybeAppendFlag(syscall.MS_MANDLOCK, "MS_MANDLOCK")
    37  	maybeAppendFlag(syscall.MS_NOATIME, "MS_NOATIME")
    38  	maybeAppendFlag(syscall.MS_NODEV, "MS_NODEV")
    39  	maybeAppendFlag(syscall.MS_NODIRATIME, "MS_NODIRATIME")
    40  	maybeAppendFlag(syscall.MS_NOEXEC, "MS_NOEXEC")
    41  	maybeAppendFlag(syscall.MS_NOSUID, "MS_NOSUID")
    42  	maybeAppendFlag(syscall.MS_RDONLY, "MS_RDONLY")
    43  	maybeAppendFlag(syscall.MS_REC, "MS_REC")
    44  	maybeAppendFlag(syscall.MS_RELATIME, "MS_RELATIME")
    45  	maybeAppendFlag(syscall.MS_SILENT, "MS_SILENT")
    46  	maybeAppendFlag(syscall.MS_STRICTATIME, "MS_STRICTATIME")
    47  	maybeAppendFlag(syscall.MS_SYNCHRONOUS, "MS_SYNCHRONOUS")
    48  	maybeAppendFlag(syscall.MS_REMOUNT, "MS_REMOUNT")
    49  	maybeAppendFlag(syscall.MS_BIND, "MS_BIND")
    50  	maybeAppendFlag(syscall.MS_SHARED, "MS_SHARED")
    51  	maybeAppendFlag(syscall.MS_PRIVATE, "MS_PRIVATE")
    52  	maybeAppendFlag(syscall.MS_SLAVE, "MS_SLAVE")
    53  	maybeAppendFlag(syscall.MS_UNBINDABLE, "MS_UNBINDABLE")
    54  	maybeAppendFlag(syscall.MS_MOVE, "MS_MOVE")
    55  
    56  	return strings.Join(s, "|")
    57  }