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 



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# File 'lib/train/extras/stat.rb', line 102

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], $u, $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 



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# 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 



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

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 



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# 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? || backend.os[:name] == 'alpine') ? '-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 == '?' or selinux == '(null)' or 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 



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# File 'lib/train/extras/stat.rb', line 21

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