Class: Train::Extras::Stat

Inherits:
Object
  • Object
show all
Defined in:
lib/train/extras/stat.rb

Constant Summary collapse

TYPES = 
{
  socket: 00140000,
  symlink: 00120000,
  file: 00100000,
  block_device: 00060000,
  directory: 00040000,
  character_device: 00020000,
  pipe: 00010000,
}.freeze

Class Method Summary collapse

Class Method Details

.aix_stat(shell_escaped_path, backend, follow_symlink) ⇒ Object 



103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
 
# File 'lib/train/extras/stat.rb', line 103

def self.aix_stat(shell_escaped_path, backend, follow_symlink)
  # Perl here b/c it is default on AIX
  lstat = follow_symlink ? "lstat" : "stat"
  stat_cmd = <<-EOP
  perl -e '
  @a = #{lstat}(shift) or exit 2;
  $u = getpwuid($a[4]);
  $g = getgrgid($a[5]);
  printf("0%o\\n%s\\n%d\\n%s\\n%d\\n%d\\n%d\\n", $a[2], $u, $a[4], $g, $a[5], $a[9], $a[7])
  ' #{shell_escaped_path}
  EOP

  res = backend.run_command(stat_cmd)
  return {} if res.exit_status != 0

  fields = res.stdout.split("\n")
  return {} if fields.length != 7

  tmask = fields[0].to_i(8)
  {
    type: find_type(tmask),
    mode: tmask & 07777,
    owner: fields[1],
    uid: fields[2].to_i,
    group: fields[3],
    gid: fields[4].to_i,
    mtime: fields[5].to_i,
    size: fields[6].to_i,
    selinux_label: nil,
  }
end

.bsd_stat(shell_escaped_path, backend, follow_symlink) ⇒ Object 



62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
 
# File 'lib/train/extras/stat.rb', line 62

def self.bsd_stat(shell_escaped_path, backend, follow_symlink)
  # From stat man page on FreeBSD:
  # z       The size of file in bytes (st_size).
  # p       File type and permissions (st_mode).
  # u, g    User ID and group ID of file's owner (st_uid, st_gid).
  # a, m, c, B
  #         The time file was last accessed or modified, or when the
  #         inode was last changed, or the birth time of the inode
  #         (st_atime, st_mtime, st_ctime, st_birthtime).
  #
  # The special output specifier S may be used to indicate that the
  # output, if applicable, should be in string format.  May be used
  # in combination with:
  #      ...
  #      gu      Display group or user name.
  lstat = follow_symlink ? " -L" : ""
  res = backend.run_command(
    "stat#{lstat} -f '%z\n%p\n%Su\n%u\n%Sg\n%g\n%a\n%m' "\
    "#{shell_escaped_path}"
  )

  return {} if res.exit_status != 0

  fields = res.stdout.split("\n")
  return {} if fields.length != 8

  tmask = fields[1].to_i(8)

  {
    type: find_type(tmask),
    mode: tmask & 07777,
    owner: fields[2],
    uid: fields[3].to_i,
    group: fields[4],
    gid: fields[5].to_i,
    mtime: fields[7].to_i,
    size: fields[0].to_i,
    selinux_label: fields[8],
  }
end

.find_type(mode) ⇒ Object 



15
16
17
18
 
# File 'lib/train/extras/stat.rb', line 15

def self.find_type(mode)
  res = TYPES.find { |_, mask| mask & mode == mask }
  res.nil? ? :unknown : res[0]
end

.linux_stat(shell_escaped_path, backend, follow_symlink) ⇒ Object 



35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
 
# File 'lib/train/extras/stat.rb', line 35

def self.linux_stat(shell_escaped_path, backend, follow_symlink)
  lstat = follow_symlink ? " -L" : ""
  format = (backend.os.esx? || %w{alpine yocto ubios}.include?(backend.os[:name])) ? "-c" : "--printf"
  res = backend.run_command("stat#{lstat} #{shell_escaped_path} 2>/dev/null #{format} '%s\n%f\n%U\n%u\n%G\n%g\n%X\n%Y\n%C'")
  # ignore the exit_code: it is != 0 if selinux labels are not supported
  # on the system.

  fields = res.stdout.split("\n")
  return {} if fields.length != 9

  tmask = fields[1].to_i(16)
  selinux = fields[8]
  ## selinux security context string not available on esxi
  selinux = nil if (selinux == "?") || (selinux == "(null)") || (selinux == "C")
  {
    type: find_type(tmask),
    mode: tmask & 07777,
    owner: fields[2],
    uid: fields[3].to_i,
    group: fields[4],
    gid: fields[5].to_i,
    mtime: fields[7].to_i,
    size: fields[0].to_i,
    selinux_label: selinux,
  }
end

.stat(shell_escaped_path, backend, follow_symlink) ⇒ Object 



20
21
22
23
24
25
26
27
28
29
30
31
32
33
 
# File 'lib/train/extras/stat.rb', line 20

def self.stat(shell_escaped_path, backend, follow_symlink)
  # use perl scripts for aix, solaris 10 and hpux
  if backend.os.aix? || (backend.os.solaris? && backend.os[:release].to_i < 11) || backend.os.hpux?
    return aix_stat(shell_escaped_path, backend, follow_symlink)
  end
  return bsd_stat(shell_escaped_path, backend, follow_symlink) if backend.os.bsd?
  # linux,solaris 11 and esx will use standard linux stats
  return linux_stat(shell_escaped_path, backend, follow_symlink) if backend.os.unix? || backend.os.esx?

  # all other cases we don't handle
  # TODO: print an error if we get here, as it shouldn't be invoked
  # on non-unix
  {}
end