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|
require_relative '../../puppet/file_system'
require 'delegate'
require 'tmpdir'
# A class that provides `Tempfile`-like capabilities, but does not attempt to
# manage the deletion of the file for you. API is identical to the
# normal `Tempfile` class.
#
# @api public
class Puppet::FileSystem::Uniquefile < DelegateClass(File)
# Convenience method which ensures that the file is closed and
# unlinked before returning
#
# @param identifier [String] additional part of generated pathname
# @yieldparam file [File] the temporary file object
# @return result of the passed block
# @api private
def self.open_tmp(identifier)
f = new(identifier)
yield f
ensure
if f
f.close!
end
end
def initialize(basename, *rest)
create_tmpname(basename, *rest) do |tmpname, n, opts|
mode = File::RDWR|File::CREAT|File::EXCL
perm = 0600
if opts
mode |= opts.delete(:mode) || 0
opts[:perm] = perm
perm = nil
else
opts = perm
end
self.class.locking(tmpname) do
@tmpfile = File.open(tmpname, mode, opts)
@tmpname = tmpname
end
@mode = mode & ~(File::CREAT|File::EXCL)
perm or opts.freeze
@opts = opts
end
super(@tmpfile)
end
# Opens or reopens the file with mode "r+".
def open
@tmpfile.close if @tmpfile
@tmpfile = File.open(@tmpname, @mode, @opts)
__setobj__(@tmpfile)
end
def _close
begin
@tmpfile.close if @tmpfile
ensure
@tmpfile = nil
end
end
protected :_close
def close(unlink_now=false)
if unlink_now
close!
else
_close
end
end
def close!
_close
unlink
end
def unlink
return unless @tmpname
begin
File.unlink(@tmpname)
rescue Errno::ENOENT
rescue Errno::EACCES
# may not be able to unlink on Windows; just ignore
return
end
@tmpname = nil
end
alias delete unlink
# Returns the full path name of the temporary file.
# This will be nil if #unlink has been called.
def path
@tmpname
end
private
def make_tmpname(prefix_suffix, n)
case prefix_suffix
when String
prefix = prefix_suffix
suffix = ""
when Array
prefix = prefix_suffix[0]
suffix = prefix_suffix[1]
else
raise ArgumentError, _("unexpected prefix_suffix: %{value}") % { value: prefix_suffix.inspect }
end
t = Time.now.strftime("%Y%m%d")
path = "#{prefix}#{t}-#{$$}-#{rand(0x100000000).to_s(36)}"
path << "-#{n}" if n
path << suffix
end
def create_tmpname(basename, *rest)
opts = try_convert_to_hash(rest[-1])
if opts
opts = opts.dup if rest.pop.equal?(opts)
max_try = opts.delete(:max_try)
opts = [opts]
else
opts = []
end
tmpdir, = *rest
tmpdir ||= tmpdir()
n = nil
begin
path = File.join(tmpdir, make_tmpname(basename, n))
yield(path, n, *opts)
rescue Errno::EEXIST
n ||= 0
n += 1
retry if !max_try or n < max_try
raise _("cannot generate temporary name using `%{basename}' under `%{tmpdir}'") % { basename: basename, tmpdir: tmpdir }
end
path
end
def try_convert_to_hash(h)
begin
h.to_hash
rescue NoMethodError
nil
end
end
@@systmpdir ||= defined?(Etc.systmpdir) ? Etc.systmpdir : '/tmp'
def tmpdir
tmp = '.'
for dir in [ Puppet::Util.get_env('TMPDIR'), Puppet::Util.get_env('TMP'), Puppet::Util.get_env('TEMP'), @@systmpdir, '/tmp']
stat = File.stat(dir) if dir
if stat && stat.directory? && stat.writable?
tmp = dir
break
end rescue nil
end
File.expand_path(tmp)
end
class << self
# yields with locking for +tmpname+ and returns the result of the
# block.
def locking(tmpname)
lock = tmpname + '.lock'
mkdir(lock)
yield
rescue Errno::ENOENT => e
ex = Errno::ENOENT.new("A directory component in #{lock} does not exist or is a dangling symbolic link")
ex.set_backtrace(e.backtrace)
raise ex
ensure
rmdir(lock) if Puppet::FileSystem.exist?(lock)
end
def mkdir(*args)
Dir.mkdir(*args)
end
def rmdir(*args)
Dir.rmdir(*args)
end
end
end
|
