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inc/File/Temp.pm  view on Meta::CPAN

# First checks to see if the directory is not owned by the
# current user or root. Then checks to see if anyone else
# can write to the directory and if so, checks to see if
# it has the sticky bit set

# Will not work on systems that do not support sticky bit

#Args:  directory path to check
#       Optionally: reference to scalar to contain error message
# Returns true if the path is safe and false otherwise.
# Returns undef if can not even run stat() on the path

# This routine based on version written by Tom Christiansen

# Presumably, by the time we actually attempt to create the
# file or directory in this directory, it may not be safe
# anymore... Have to run _is_safe directly after the open.

sub _is_safe {

  my $path = shift;
  my $err_ref = shift;

  # Stat path
  my @info = stat($path);
  unless (scalar(@info)) {
    $$err_ref = "stat(path) returned no values";
    return 0;
  };
  return 1 if $^O eq 'VMS';  # owner delete control at file level

  # Check to see whether owner is neither superuser (or a system uid) nor me
  # Use the effective uid from the $> variable
  # UID is in [4]
  if ($info[4] > File::Temp->top_system_uid() && $info[4] != $>) {

    Carp::cluck(sprintf "uid=$info[4] topuid=%s euid=$> path='$path'",

inc/File/Temp.pm  view on Meta::CPAN

#line 1934

sub unlink0 {

  croak 'Usage: unlink0(filehandle, filename)'
    unless scalar(@_) == 2;

  # Read args
  my ($fh, $path) = @_;

  cmpstat($fh, $path) or return 0;

  # attempt remove the file (does not work on some platforms)
  if (_can_unlink_opened_file()) {

    # return early (Without unlink) if we have been instructed to retain files.
    return 1 if $KEEP_ALL;

    # XXX: do *not* call this on a directory; possible race
    #      resulting in recursive removal
    croak "unlink0: $path has become a directory!" if -d $path;

inc/File/Temp.pm  view on Meta::CPAN

    _deferred_unlink($fh, $path, 0);
    return 1;
  }

}

#line 1999

sub cmpstat {

  croak 'Usage: cmpstat(filehandle, filename)'
    unless scalar(@_) == 2;

  # Read args
  my ($fh, $path) = @_;

  warn "Comparing stat\n"
    if $DEBUG;

  # Stat the filehandle - which may be closed if someone has manually
  # closed the file. Can not turn off warnings without using $^W

inc/File/Temp.pm  view on Meta::CPAN

#line 2092

sub unlink1 {
  croak 'Usage: unlink1(filehandle, filename)'
    unless scalar(@_) == 2;

  # Read args
  my ($fh, $path) = @_;

  cmpstat($fh, $path) or return 0;

  # Close the file
  close( $fh ) or return 0;

  # Make sure the file is writable (for windows)
  _force_writable( $path );

  # return early (without unlink) if we have been instructed to retain files.
  return 1 if $KEEP_ALL;

inc/Module/Install.pm  view on Meta::CPAN

# If the script that is loading Module::Install is from the future,
# then make will detect this and cause it to re-run over and over
# again. This is bad. Rather than taking action to touch it (which
# is unreliable on some platforms and requires write permissions)
# for now we should catch this and refuse to run.
if ( -f $0 and (stat($0))[9] > time ) { die <<"END_DIE" }

Your installer $0 has a modification time in the future.

This is known to create infinite loops in make.

Please correct this, then run $0 again.

END_DIE