4 # https://sourceware.org/bugzilla/show_bug.cgi?id=26034
5 export "BUP_ARGV_0"="$0"
8 export "BUP_ARGV_${arg_i}"="$arg"
12 # Here to end of preamble replaced during install
16 # loop because macos doesn't have recursive readlink/realpath utils
17 while test -L "$cmdpath"; do
18 link="$(readlink "$cmdpath")"
19 cd "$(dirname "$cmdpath")"
22 script_home="$(cd "$(dirname "$cmdpath")" && pwd -P)"
24 exec "$script_home/../../config/bin/python" "$0"
28 from __future__ import absolute_import, print_function
31 sys.path[:0] = [os.path.dirname(os.path.realpath(__file__)) + '/..']
33 from importlib import import_module
34 from pkgutil import iter_modules
35 from subprocess import PIPE
36 from threading import Thread
37 import errno, getopt, os, re, select, signal, subprocess, sys
39 from bup import compat, path, helpers
40 from bup.compat import (
50 from bup.compat import add_ex_tb, add_ex_ctx, argv_bytes, wrap_main
51 from bup.helpers import (
59 from bup.git import close_catpipes
60 from bup.io import byte_stream, path_msg
61 from bup.options import _tty_width
64 def maybe_import_early(argv):
65 """Scan argv and import any modules specified by --import-py-module."""
67 if argv[0] != '--import-py-module':
71 log("bup: --import-py-module must have an argument\n")
77 maybe_import_early(compat.argv)
81 cmdpath = path.cmddir()
83 # Remove once we finish the internal command transition
84 transition_cmdpath = path.libdir() + b'/bup/cmd'
86 # We manipulate the subcmds here as strings, but they must be ASCII
87 # compatible, since we're going to be looking for exactly
88 # b'bup-SUBCMD' to exec.
91 log('Usage: bup [-?|--help] [-d BUP_DIR] [--debug] [--profile] '
92 '<command> [options...]\n\n')
94 ftp = 'Browse backup sets using an ftp-like client',
95 fsck = 'Check backup sets for damage and add redundancy information',
96 fuse = 'Mount your backup sets as a filesystem',
97 help = 'Print detailed help for the given command',
98 index = 'Create or display the index of files to back up',
99 on = 'Backup a remote machine to the local one',
100 restore = 'Extract files from a backup set',
101 save = 'Save files into a backup set (note: run "bup index" first)',
102 tag = 'Tag commits for easier access',
103 web = 'Launch a web server to examine backup sets',
106 log('Common commands:\n')
107 for cmd,synopsis in sorted(common.items()):
108 log(' %-10s %s\n' % (cmd, synopsis))
111 log('Other available commands:\n')
113 for c in sorted(os.listdir(cmdpath)):
114 if c.startswith(b'bup-') and c.find(b'.') < 0:
115 cname = fsdecode(c[4:])
116 if cname not in common:
117 cmds.add(c[4:].decode(errors='backslashreplace'))
118 # built-in commands take precedence
119 for _, name, _ in iter_modules(path=bup.cmd.__path__):
120 name = name.replace('_','-')
121 if name not in common:
124 log(columnate(sorted(cmds), ' '))
127 log("See 'bup help COMMAND' for more information on " +
128 "a specific command.\n")
137 # Handle global options.
139 optspec = ['help', 'version', 'debug', 'profile', 'bup-dir=',
141 global_args, subcmd = getopt.getopt(argv[1:], '?VDd:', optspec)
142 except getopt.GetoptError as ex:
143 usage('error: %s' % ex.msg)
145 subcmd = [argv_bytes(x) for x in subcmd]
146 help_requested = None
150 for opt in global_args:
151 if opt[0] in ['-?', '--help']:
152 help_requested = True
153 elif opt[0] in ['-V', '--version']:
154 subcmd = [b'version']
155 elif opt[0] in ['-D', '--debug']:
157 environ[b'BUP_DEBUG'] = b'%d' % helpers.buglvl
158 elif opt[0] in ['--profile']:
160 elif opt[0] in ['-d', '--bup-dir']:
161 bup_dir = argv_bytes(opt[1])
162 elif opt[0] == '--import-py-module':
165 usage('error: unexpected option "%s"' % opt[0])
167 # Make BUP_DIR absolute, so we aren't affected by chdir (i.e. save -C, etc.).
169 environ[b'BUP_DIR'] = os.path.abspath(bup_dir)
177 if help_requested and subcmd[0] != b'help':
178 subcmd = [b'help'] + subcmd
180 if len(subcmd) > 1 and subcmd[1] == b'--help' and subcmd[0] != b'help':
181 subcmd = [b'help', subcmd[0]] + subcmd[2:]
183 subcmd_name = subcmd[0]
188 if subcmd_name not in (b'bloom',
224 raise ModuleNotFoundError()
225 cmd_module = import_module('bup.cmd.'
226 + subcmd_name.decode('ascii').replace('-', '_'))
227 except ModuleNotFoundError as ex:
231 subcmd[0] = os.path.join(cmdpath, b'bup-' + subcmd_name)
232 if not os.path.exists(subcmd[0]):
233 subcmd[0] = b'%s/%s.py' % (transition_cmdpath,
234 subcmd_name.replace(b'-', b'_'))
235 if not os.path.exists(subcmd[0]):
236 usage('error: unknown command "%s"' % path_msg(subcmd_name))
238 already_fixed = int(environ.get(b'BUP_FORCE_TTY', 0))
239 if subcmd_name in [b'mux', b'ftp', b'help']:
241 fix_stdout = not already_fixed and os.isatty(1)
242 fix_stderr = not already_fixed and os.isatty(2)
244 if fix_stdout or fix_stderr:
245 tty_env = merge_dict(environ,
246 {b'BUP_FORCE_TTY': (b'%d'
247 % ((fix_stdout and 1 or 0)
248 + (fix_stderr and 2 or 0))),
249 b'BUP_TTY_WIDTH': b'%d' % _tty_width(), })
254 sep_rx = re.compile(br'([\r\n])')
256 def print_clean_line(dest, content, width, sep=None):
257 """Write some or all of content, followed by sep, to the dest fd after
258 padding the content with enough spaces to fill the current
259 terminal width or truncating it to the terminal width if sep is a
262 assert sep in (b'\r', b'\n', None)
268 assert not sep_rx.match(x)
269 content = b''.join(content)
270 if sep == b'\r' and len(content) > width:
271 content = content[width:]
272 os.write(dest, content)
273 if len(content) < width:
274 os.write(dest, b' ' * (width - len(content)))
278 def filter_output(srcs, dests):
279 """Transfer data from file descriptors in srcs to the corresponding
280 file descriptors in dests print_clean_line until all of the srcs
285 assert all(type(x) in int_types for x in srcs)
286 assert all(type(x) in int_types for x in srcs)
287 assert len(srcs) == len(dests)
289 dest_for = dict(zip(srcs, dests))
294 ready_fds, _, _ = select.select(srcs, [], [])
297 buf = os.read(fd, 4096)
300 srcs = tuple([x for x in srcs if x is not fd])
301 print_clean_line(dest, pending.pop(fd, []), width)
303 split = sep_rx.split(buf)
304 while len(split) > 1:
305 content, sep = split[:2]
307 print_clean_line(dest,
308 pending.pop(fd, []) + [content],
311 assert len(split) == 1
313 pending.setdefault(fd, []).extend(split)
314 except BaseException as ex:
315 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
317 # Try to finish each of the streams
318 for fd, pending_items in compat.items(pending):
322 print_clean_line(dest, pending_items, width)
323 except (EnvironmentError, EOFError) as ex:
324 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
325 except BaseException as ex:
326 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
331 def import_and_run_main(module, args):
334 f = compile('module.main(args)', __file__, 'exec')
335 cProfile.runctx(f, globals(), locals())
340 def run_module_cmd(module, args):
341 if not (fix_stdout or fix_stderr):
342 import_and_run_main(module, args)
344 # Interpose filter_output between all attempts to write to the
345 # stdout/stderr and the real stdout/stderr (e.g. the fds that
346 # connect directly to the terminal) via a thread that runs
347 # filter_output in a pipeline.
350 real_out_fd = real_err_fd = stdout_pipe = stderr_pipe = None
351 filter_thread = filter_thread_started = None
356 stdout_pipe = os.pipe() # monitored_by_filter, stdout_everyone_uses
357 real_out_fd = os.dup(sys.stdout.fileno())
358 os.dup2(stdout_pipe[1], sys.stdout.fileno())
359 srcs.append(stdout_pipe[0])
360 dests.append(real_out_fd)
363 stderr_pipe = os.pipe() # monitored_by_filter, stderr_everyone_uses
364 real_err_fd = os.dup(sys.stderr.fileno())
365 os.dup2(stderr_pipe[1], sys.stderr.fileno())
366 srcs.append(stderr_pipe[0])
367 dests.append(real_err_fd)
369 filter_thread = Thread(name='output filter',
370 target=lambda : filter_output(srcs, dests))
371 filter_thread.start()
372 filter_thread_started = True
373 import_and_run_main(module, args)
374 except Exception as ex:
379 # Try to make sure that whatever else happens, we restore
380 # stdout and stderr here, if that's possible, so that we don't
381 # risk just losing some output.
383 real_out_fd is not None and os.dup2(real_out_fd, sys.stdout.fileno())
384 except Exception as ex:
386 add_ex_ctx(ex, pending_ex)
388 real_err_fd is not None and os.dup2(real_err_fd, sys.stderr.fileno())
389 except Exception as ex:
391 add_ex_ctx(ex, pending_ex)
394 stdout_pipe is not None and os.close(stdout_pipe[1])
395 except Exception as ex:
397 add_ex_ctx(ex, pending_ex)
399 stderr_pipe is not None and os.close(stderr_pipe[1])
400 except Exception as ex:
402 add_ex_ctx(ex, pending_ex)
405 except Exception as ex:
407 add_ex_ctx(ex, pending_ex)
410 # There's no point in trying to join unless we finished the finally block.
411 if filter_thread_started:
415 def run_subproc_cmd(args):
417 c = (do_profile and [sys.executable, b'-m', b'cProfile'] or []) + args
418 if not (fix_stdout or fix_stderr):
423 out = byte_stream(sys.stdout)
424 err = byte_stream(sys.stderr)
427 p = subprocess.Popen(c,
428 stdout=PIPE if fix_stdout else out,
429 stderr=PIPE if fix_stderr else err,
430 env=tty_env, bufsize=4096, close_fds=True)
431 # Assume p will receive these signals and quit, which will
432 # then cause us to quit.
433 for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
434 signal.signal(sig, signal.SIG_IGN)
439 srcs.append(p.stdout.fileno())
440 dests.append(out.fileno())
442 srcs.append(p.stderr.fileno())
443 dests.append(err.fileno())
444 filter_output(srcs, dests)
446 except BaseException as ex:
449 if p and p.poll() == None:
450 os.kill(p.pid, signal.SIGTERM)
452 except BaseException as kill_ex:
453 raise add_ex_ctx(add_ex_tb(kill_ex), ex)
457 def run_subcmd(module, args):
459 run_module_cmd(module, args)
461 run_subproc_cmd(args)
464 wrap_main(lambda : run_subcmd(cmd_module, subcmd))