Module: FPM::Util
- Extended by:
- FFI::Library
- Included in:
- Command, Command::Validator, Package, Package::NPM
- Defined in:
- lib/fpm/util.rb,
lib/fpm/util/tar_writer.rb
Overview
Some utility functions
Defined Under Namespace
Classes: ExecutableNotFound, ProcessFailed, TarWriter
Instance Method Summary collapse
-
#copied_entries ⇒ Object
def copy_entry.
- #copy_entry(src, dst, preserve = false, remove_destination = false) ⇒ Object
- #copy_metadata(source, destination) ⇒ Object
-
#default_shell ⇒ Object
def program_exists?.
-
#execmd(*args) ⇒ Object
execmd( cmd [,opts]).
-
#expand_pessimistic_constraints(constraint) ⇒ Object
def copied_entries.
-
#logger ⇒ Object
def expand_pesimistic_constraints.
-
#mknod_w(path, mode, dev) ⇒ Object
wrapper around mknod ffi calls.
-
#program_exists?(program) ⇒ Boolean
def program_in_path.
-
#program_in_path?(program) ⇒ Boolean
Is the given program in the system’s PATH?.
-
#safesystem(*args) ⇒ Object
Run a command safely in a way that gets reports useful errors.
-
#safesystemout(*args) ⇒ Object
Run a command safely in a way that captures output and status.
-
#tar_cmd ⇒ Object
Get the recommended ‘tar’ command for this platform.
Instance Method Details
#copied_entries ⇒ Object
def copy_entry
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# File 'lib/fpm/util.rb', line 308 def copied_entries # TODO(sissel): I wonder that this entry-copy knowledge needs to be put # into a separate class/module. As is, calling copy_entry the same way # in slightly different contexts will result in weird or bad behavior. # What I mean is if we do: # pkg = FPM::Package::Dir... # pkg.output()... # pkg.output()... # The 2nd output call will fail or behave weirdly because @copied_entries # is already populated. even though this is anew round of copying. return @copied_entries ||= {} end |
#copy_entry(src, dst, preserve = false, remove_destination = false) ⇒ Object
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# File 'lib/fpm/util.rb', line 285 def copy_entry(src, dst, preserve=false, remove_destination=false) case File.ftype(src) when 'fifo', 'characterSpecial', 'blockSpecial', 'socket' st = File.stat(src) rc = mknod_w(dst, st.mode, st.dev) raise SystemCallError.new("mknod error", FFI.errno) if rc == -1 when 'directory' FileUtils.mkdir(dst) unless File.exists? dst else # if the file with the same dev and inode has been copied already - # hard link it's copy to `dst`, otherwise make an actual copy st = File.lstat(src) known_entry = copied_entries[[st.dev, st.ino]] if known_entry FileUtils.ln(known_entry, dst) else FileUtils.copy_entry(src, dst, preserve=preserve, remove_destination=remove_destination) copied_entries[[st.dev, st.ino]] = dst end end # else... end |
#copy_metadata(source, destination) ⇒ Object
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# File 'lib/fpm/util.rb', line 262 def (source, destination) source_stat = File::lstat(source) dest_stat = File::lstat(destination) # If this is a hard-link, there's no metadata to copy. # If this is a symlink, what it points to hasn't been copied yet. return if source_stat.ino == dest_stat.ino || dest_stat.symlink? File.utime(source_stat.atime, source_stat.mtime, destination) mode = source_stat.mode begin File.lchown(source_stat.uid, source_stat.gid, destination) rescue Errno::EPERM # clear setuid/setgid mode &= 01777 end unless source_stat.symlink? File.chmod(mode, destination) end end |
#default_shell ⇒ Object
def program_exists?
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# File 'lib/fpm/util.rb', line 42 def default_shell shell = ENV["SHELL"] return "/bin/sh" if shell.nil? || shell.empty? return shell end |
#execmd(*args) ⇒ Object
execmd( cmd [,opts])
Execute a command as a child process. The function allows to:
-
pass environment variables to child process,
-
communicate with stdin, stdout and stderr of the child process via pipes,
-
retrieve execution’s status code.
—- EXAMPLE 1 (simple execution)
if execmd([‘which’, ‘python’]) == 0
p "Python is installed"
end
—- EXAMPLE 2 (custom environment variables)
execmd(:PYTHONPATH=>‘/home/me/foo’, [ ‘python’, ‘-m’, ‘bar’])
—- EXAMPLE 3 (communicating via stdin, stdout and stderr)
script = <<PYTHON import sys sys.stdout.write(“normal outputn”) sys.stdout.write(“narning or errorn”) PYTHON status = execmd(‘python’) do |stdin,stdout,stderr|
stdin.write(script)
stdin.close
p "STDOUT: #{stdout.read}"
p "STDERR: #{stderr.read}"
end p “STATUS: #status”
—- EXAMPLE 4 (additional options)
execmd([‘which’, ‘python’], :process=>true, :stdin=>false, :stderr=>false) do |process,stdout|
p = stdout.read.chomp
process.wait
if (x = process.exit_code) == 0
p "PYTHON: #{p}"
else
p "ERROR: #{x}"
end
end
OPTIONS:
:process (default: false) -- pass process object as the first argument the to block,
:stdin (default: true) -- pass stdin object of the child process to the block for writting,
:stdout (default: true) -- pass stdout object of the child process to the block for reading,
:stderr (default: true) -- pass stderr object of the child process to the block for reading,
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# File 'lib/fpm/util.rb', line 102 def execmd(*args) i = 0 if i < args.size if args[i].kind_of?(Hash) # args[0] may contain environment variables env = args[i] i += 1 else env = Hash[] end end if i < args.size if args[i].kind_of?(Array) args2 = args[i] else args2 = [ args[i] ] end program = args2[0] i += 1 else raise ArgumentError.new("missing argument: cmd") end if i < args.size if args[i].kind_of?(Hash) opts = Hash[args[i].map {|k,v| [k.to_sym, v]} ] i += 1 end else opts = Hash[] end opts[:process] = false unless opts.include?(:process) opts[:stdin] = true unless opts.include?(:stdin) opts[:stdout] = true unless opts.include?(:stdout) opts[:stderr] = true unless opts.include?(:stderr) if !program.include?("/") and !program_in_path?(program) raise ExecutableNotFound.new(program) end logger.debug("Running command", :args => args2) stdout_r, stdout_w = IO.pipe stderr_r, stderr_w = IO.pipe process = ChildProcess.build(*args2) process.environment.merge!(env) process.io.stdout = stdout_w process.io.stderr = stderr_w if block_given? and opts[:stdin] process.duplex = true end process.start stdout_w.close; stderr_w.close logger.debug("Process is running", :pid => process.pid) if block_given? args3 = [] args3.push(process) if opts[:process] args3.push(process.io.stdin) if opts[:stdin] args3.push(stdout_r) if opts[:stdout] args3.push(stderr_r) if opts[:stderr] yield(*args3) process.io.stdin.close if opts[:stdin] and not process.io.stdin.closed? stdout_r.close unless stdout_r.closed? stderr_r.close unless stderr_r.closed? else # Log both stdout and stderr as 'info' because nobody uses stderr for # actually reporting errors and as a result 'stderr' is a misnomer. logger.pipe(stdout_r => :info, stderr_r => :info) end process.wait if process.alive? return process.exit_code end |
#expand_pessimistic_constraints(constraint) ⇒ Object
def copied_entries
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# File 'lib/fpm/util.rb', line 321 def (constraint) name, op, version = constraint.split(/\s+/) if op == '~>' new_lower_constraint = "#{name} >= #{version}" version_components = version.split('.').collect { |v| v.to_i } version_prefix = version_components[0..-3].join('.') portion_to_work_with = version_components.last(2) prefix = '' unless version_prefix.empty? prefix = version_prefix + '.' end one_to_increment = portion_to_work_with[0].to_i incremented = one_to_increment + 1 new_version = ''+ incremented.to_s + '.0' upper_version = prefix + new_version new_upper_constraint = "#{name} < #{upper_version}" return [new_lower_constraint,new_upper_constraint] else return [constraint] end end |
#logger ⇒ Object
def expand_pesimistic_constraints
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# File 'lib/fpm/util.rb', line 353 def logger @logger ||= Cabin::Channel.get end |
#mknod_w(path, mode, dev) ⇒ Object
wrapper around mknod ffi calls
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# File 'lib/fpm/util.rb', line 250 def mknod_w(path, mode, dev) rc = -1 case %x{uname -s}.chomp when 'Linux' # bits/stat.h #define _MKNOD_VER_LINUX 0 rc = xmknod(0, path, mode, FFI::MemoryPointer.new(dev)) else rc = mknod(path, mode, dev) end rc end |
#program_exists?(program) ⇒ Boolean
def program_in_path
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# File 'lib/fpm/util.rb', line 35 def program_exists?(program) # Scan path to find the executable # Do this to help the user get a better error message. return program_in_path?(program) if !program.include?("/") return File.executable?(program) end |
#program_in_path?(program) ⇒ Boolean
Is the given program in the system’s PATH?
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# File 'lib/fpm/util.rb', line 26 def program_in_path?(program) # return false if path is not set return false unless ENV['PATH'] # Scan path to find the executable # Do this to help the user get a better error message. envpath = ENV["PATH"].split(":") return envpath.select { |p| File.executable?(File.join(p, program)) }.any? end |
#safesystem(*args) ⇒ Object
Run a command safely in a way that gets reports useful errors.
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# File 'lib/fpm/util.rb', line 187 def safesystem(*args) # ChildProcess isn't smart enough to run a $SHELL if there's # spaces in the first arg and there's only 1 arg. if args.size == 1 args = [ default_shell, "-c", args[0] ] end program = args[0] exit_code = execmd(args) success = (exit_code == 0) if !success raise ProcessFailed.new("#{program} failed (exit code #{exit_code})" \ ". Full command was:#{args.inspect}") end return success end |
#safesystemout(*args) ⇒ Object
Run a command safely in a way that captures output and status.
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# File 'lib/fpm/util.rb', line 206 def safesystemout(*args) if args.size == 1 args = [ ENV["SHELL"], "-c", args[0] ] end program = args[0] if !program.include?("/") and !program_in_path?(program) raise ExecutableNotFound.new(program) end stdout_r_str = nil exit_code = execmd(args, :stdin=>false, :stderr=>false) do |stdout| stdout_r_str = stdout.read end success = (exit_code == 0) if !success raise ProcessFailed.new("#{program} failed (exit code #{exit_code})" \ ". Full command was:#{args.inspect}") end return stdout_r_str end |
#tar_cmd ⇒ Object
Get the recommended ‘tar’ command for this platform.
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# File 'lib/fpm/util.rb', line 230 def tar_cmd # Rely on gnu tar for solaris and OSX. case %x{uname -s}.chomp when "SunOS" return "gtar" when "Darwin" # Try running gnutar, it was renamed(??) in homebrew to 'gtar' at some point, I guess? I don't know. ["gnutar", "gtar"].each do |tar| system("#{tar} > /dev/null 2> /dev/null") return tar unless $?.exitstatus == 127 end when "FreeBSD" # use gnutar instead return "gtar" else return "tar" end end |