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',
225 raise ModuleNotFoundError()
226 cmd_module = import_module('bup.cmd.'
227 + subcmd_name.decode('ascii').replace('-', '_'))
228 except ModuleNotFoundError as ex:
232 subcmd[0] = os.path.join(cmdpath, b'bup-' + subcmd_name)
233 if not os.path.exists(subcmd[0]):
234 subcmd[0] = b'%s/%s.py' % (transition_cmdpath,
235 subcmd_name.replace(b'-', b'_'))
236 if not os.path.exists(subcmd[0]):
237 usage('error: unknown command "%s"' % path_msg(subcmd_name))
239 already_fixed = int(environ.get(b'BUP_FORCE_TTY', 0))
240 if subcmd_name in [b'mux', b'ftp', b'help']:
242 fix_stdout = not already_fixed and os.isatty(1)
243 fix_stderr = not already_fixed and os.isatty(2)
245 if fix_stdout or fix_stderr:
246 tty_env = merge_dict(environ,
247 {b'BUP_FORCE_TTY': (b'%d'
248 % ((fix_stdout and 1 or 0)
249 + (fix_stderr and 2 or 0))),
250 b'BUP_TTY_WIDTH': b'%d' % _tty_width(), })
255 sep_rx = re.compile(br'([\r\n])')
257 def print_clean_line(dest, content, width, sep=None):
258 """Write some or all of content, followed by sep, to the dest fd after
259 padding the content with enough spaces to fill the current
260 terminal width or truncating it to the terminal width if sep is a
263 assert sep in (b'\r', b'\n', None)
269 assert not sep_rx.match(x)
270 content = b''.join(content)
271 if sep == b'\r' and len(content) > width:
272 content = content[width:]
273 os.write(dest, content)
274 if len(content) < width:
275 os.write(dest, b' ' * (width - len(content)))
279 def filter_output(srcs, dests):
280 """Transfer data from file descriptors in srcs to the corresponding
281 file descriptors in dests print_clean_line until all of the srcs
286 assert all(type(x) in int_types for x in srcs)
287 assert all(type(x) in int_types for x in srcs)
288 assert len(srcs) == len(dests)
290 dest_for = dict(zip(srcs, dests))
295 ready_fds, _, _ = select.select(srcs, [], [])
298 buf = os.read(fd, 4096)
301 srcs = tuple([x for x in srcs if x is not fd])
302 print_clean_line(dest, pending.pop(fd, []), width)
304 split = sep_rx.split(buf)
305 while len(split) > 1:
306 content, sep = split[:2]
308 print_clean_line(dest,
309 pending.pop(fd, []) + [content],
312 assert len(split) == 1
314 pending.setdefault(fd, []).extend(split)
315 except BaseException as ex:
316 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
318 # Try to finish each of the streams
319 for fd, pending_items in compat.items(pending):
323 print_clean_line(dest, pending_items, width)
324 except (EnvironmentError, EOFError) as ex:
325 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
326 except BaseException as ex:
327 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
332 def import_and_run_main(module, args):
335 f = compile('module.main(args)', __file__, 'exec')
336 cProfile.runctx(f, globals(), locals())
341 def run_module_cmd(module, args):
342 if not (fix_stdout or fix_stderr):
343 import_and_run_main(module, args)
345 # Interpose filter_output between all attempts to write to the
346 # stdout/stderr and the real stdout/stderr (e.g. the fds that
347 # connect directly to the terminal) via a thread that runs
348 # filter_output in a pipeline.
351 real_out_fd = real_err_fd = stdout_pipe = stderr_pipe = None
352 filter_thread = filter_thread_started = None
357 stdout_pipe = os.pipe() # monitored_by_filter, stdout_everyone_uses
358 real_out_fd = os.dup(sys.stdout.fileno())
359 os.dup2(stdout_pipe[1], sys.stdout.fileno())
360 srcs.append(stdout_pipe[0])
361 dests.append(real_out_fd)
364 stderr_pipe = os.pipe() # monitored_by_filter, stderr_everyone_uses
365 real_err_fd = os.dup(sys.stderr.fileno())
366 os.dup2(stderr_pipe[1], sys.stderr.fileno())
367 srcs.append(stderr_pipe[0])
368 dests.append(real_err_fd)
370 filter_thread = Thread(name='output filter',
371 target=lambda : filter_output(srcs, dests))
372 filter_thread.start()
373 filter_thread_started = True
374 import_and_run_main(module, args)
375 except Exception as ex:
380 # Try to make sure that whatever else happens, we restore
381 # stdout and stderr here, if that's possible, so that we don't
382 # risk just losing some output.
384 real_out_fd is not None and os.dup2(real_out_fd, sys.stdout.fileno())
385 except Exception as ex:
387 add_ex_ctx(ex, pending_ex)
389 real_err_fd is not None and os.dup2(real_err_fd, sys.stderr.fileno())
390 except Exception as ex:
392 add_ex_ctx(ex, pending_ex)
395 stdout_pipe is not None and os.close(stdout_pipe[1])
396 except Exception as ex:
398 add_ex_ctx(ex, pending_ex)
400 stderr_pipe is not None and os.close(stderr_pipe[1])
401 except Exception as ex:
403 add_ex_ctx(ex, pending_ex)
406 except Exception as ex:
408 add_ex_ctx(ex, pending_ex)
411 # There's no point in trying to join unless we finished the finally block.
412 if filter_thread_started:
416 def run_subproc_cmd(args):
418 c = (do_profile and [sys.executable, b'-m', b'cProfile'] or []) + args
419 if not (fix_stdout or fix_stderr):
424 out = byte_stream(sys.stdout)
425 err = byte_stream(sys.stderr)
428 p = subprocess.Popen(c,
429 stdout=PIPE if fix_stdout else out,
430 stderr=PIPE if fix_stderr else err,
431 env=tty_env, bufsize=4096, close_fds=True)
432 # Assume p will receive these signals and quit, which will
433 # then cause us to quit.
434 for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
435 signal.signal(sig, signal.SIG_IGN)
440 srcs.append(p.stdout.fileno())
441 dests.append(out.fileno())
443 srcs.append(p.stderr.fileno())
444 dests.append(err.fileno())
445 filter_output(srcs, dests)
447 except BaseException as ex:
450 if p and p.poll() == None:
451 os.kill(p.pid, signal.SIGTERM)
453 except BaseException as kill_ex:
454 raise add_ex_ctx(add_ex_tb(kill_ex), ex)
458 def run_subcmd(module, args):
460 run_module_cmd(module, args)
462 run_subproc_cmd(args)
465 wrap_main(lambda : run_subcmd(cmd_module, subcmd))