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// Copyright (C) 2020-2021 Ambassador Labs
// Copyright (C) 2022 Luke Shumaker <lukeshu@lukeshu.com>
//
// SPDX-License-Identifier: Apache-2.0
//
// Based on https://github.com/datawire/ocibuild/blob/master/pkg/python/stat.go
package btrfsitem
type StatMode uint32
//nolint:deadcode,varcheck // not all of these modes will be used
const (
// 16 bits = 5⅓ octal characters
ModeFmt StatMode = 0o17_0000 // mask for the type bits
_ModeFmtUnused000 StatMode = 0o00_0000
ModeFmtNamedPipe StatMode = 0o01_0000 // type: named pipe (FIFO)
ModeFmtCharDevice StatMode = 0o02_0000 // type: character device
_ModeFmtUnused003 StatMode = 0o03_0000
ModeFmtDir StatMode = 0o04_0000 // type: directory
_ModeFmtUnused005 StatMode = 0o05_0000
ModeFmtBlockDevice StatMode = 0o06_0000 // type: block device
_ModeFmtUnused007 StatMode = 0o07_0000
ModeFmtRegular StatMode = 0o10_0000 // type: regular file
_ModeFmtUnused011 StatMode = 0o11_0000
ModeFmtSymlink StatMode = 0o12_0000 // type: symbolic link
_ModeFmtUnused013 StatMode = 0o13_0000
ModeFmtSocket StatMode = 0o14_0000 // type: socket file
_ModeFmtUnused015 StatMode = 0o15_0000
_ModeFmtUnused016 StatMode = 0o16_0000
_ModeFmtUnused017 StatMode = 0o17_0000
ModePerm StatMode = 0o00_7777 // mask for permission bits
ModePermSetUID StatMode = 0o00_4000 // permission: set user id
ModePermSetGID StatMode = 0o00_2000 // permission: set group ID
ModePermSticky StatMode = 0o00_1000 // permission: sticky bit
ModePermUsrR StatMode = 0o00_0400 // permission: user: read
ModePermUsrW StatMode = 0o00_0200 // permission: user: write
ModePermUsrX StatMode = 0o00_0100 // permission: user: execute
ModePermGrpR StatMode = 0o00_0040 // permission: group: read
ModePermGrpW StatMode = 0o00_0020 // permission: group: write
ModePermGrpX StatMode = 0o00_0010 // permission: group: execute
ModePermOthR StatMode = 0o00_0004 // permission: other: read
ModePermOthW StatMode = 0o00_0002 // permission: other: write
ModePermOthX StatMode = 0o00_0001 // permission: other: execute
)
// IsDir reports whether mode describes a directory.
//
// That is, it tests that the ModeFmt bits are set to ModeFmtDir.
func (mode StatMode) IsDir() bool {
return mode&ModeFmt == ModeFmtDir
}
// IsRegular reports whether m describes a regular file.
//
// That is, it tests that the ModeFmt bits are set to ModeFmtRegular.
func (mode StatMode) IsRegular() bool {
return mode&ModeFmt == ModeFmtRegular
}
// String returns a textual representation of the mode.
//
// This is the format that POSIX specifies for showing the mode in the
// output of the `ls -l` command. POSIX does not specify the
// character to use to indicate a ModeFmtSocket file; this method uses
// 's' (GNU `ls` behavior; though POSIX notes that many
// implementations use '=' for sockets).
func (mode StatMode) String() string {
buf := [10]byte{
// type: This string is easy; it directly pairs with
// the above ModeFmtXXX list above; the character in
// the string left-to-right corresponds with the
// constant in the list top-to-bottom.
"?pc?d?b?-?l?s???"[mode>>12],
// owner
"-r"[(mode>>8)&0o1],
"-w"[(mode>>7)&0o1],
"-xSs"[((mode>>6)&0o1)|((mode>>10)&0o2)],
// group
"-r"[(mode>>5)&0o1],
"-w"[(mode>>4)&0o1],
"-xSs"[((mode>>3)&0o1)|((mode>>9)&0o2)],
// group
"-r"[(mode>>2)&0o1],
"-w"[(mode>>1)&0o1],
"-xTt"[((mode>>0)&0o1)|((mode>>8)&0o2)],
}
return string(buf[:])
}
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