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',
211 raise ModuleNotFoundError()
212 cmd_module = import_module('bup.cmd.'
213 + subcmd_name.decode('ascii').replace('-', '_'))
214 except ModuleNotFoundError as ex:
218 subcmd[0] = os.path.join(cmdpath, b'bup-' + subcmd_name)
219 if not os.path.exists(subcmd[0]):
220 subcmd[0] = b'%s/%s.py' % (transition_cmdpath,
221 subcmd_name.replace(b'-', b'_'))
222 if not os.path.exists(subcmd[0]):
223 usage('error: unknown command "%s"' % path_msg(subcmd_name))
225 already_fixed = int(environ.get(b'BUP_FORCE_TTY', 0))
226 if subcmd_name in [b'mux', b'ftp', b'help']:
228 fix_stdout = not already_fixed and os.isatty(1)
229 fix_stderr = not already_fixed and os.isatty(2)
231 if fix_stdout or fix_stderr:
232 tty_env = merge_dict(environ,
233 {b'BUP_FORCE_TTY': (b'%d'
234 % ((fix_stdout and 1 or 0)
235 + (fix_stderr and 2 or 0))),
236 b'BUP_TTY_WIDTH': b'%d' % _tty_width(), })
241 sep_rx = re.compile(br'([\r\n])')
243 def print_clean_line(dest, content, width, sep=None):
244 """Write some or all of content, followed by sep, to the dest fd after
245 padding the content with enough spaces to fill the current
246 terminal width or truncating it to the terminal width if sep is a
249 assert sep in (b'\r', b'\n', None)
255 assert not sep_rx.match(x)
256 content = b''.join(content)
257 if sep == b'\r' and len(content) > width:
258 content = content[width:]
259 os.write(dest, content)
260 if len(content) < width:
261 os.write(dest, b' ' * (width - len(content)))
265 def filter_output(srcs, dests):
266 """Transfer data from file descriptors in srcs to the corresponding
267 file descriptors in dests print_clean_line until all of the srcs
272 assert all(type(x) in int_types for x in srcs)
273 assert all(type(x) in int_types for x in srcs)
274 assert len(srcs) == len(dests)
276 dest_for = dict(zip(srcs, dests))
281 ready_fds, _, _ = select.select(srcs, [], [])
284 buf = os.read(fd, 4096)
287 srcs = tuple([x for x in srcs if x is not fd])
288 print_clean_line(dest, pending.pop(fd, []), width)
290 split = sep_rx.split(buf)
291 while len(split) > 1:
292 content, sep = split[:2]
294 print_clean_line(dest,
295 pending.pop(fd, []) + [content],
298 assert len(split) == 1
300 pending.setdefault(fd, []).extend(split)
301 except BaseException as ex:
302 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
304 # Try to finish each of the streams
305 for fd, pending_items in compat.items(pending):
309 print_clean_line(dest, pending_items, width)
310 except (EnvironmentError, EOFError) as ex:
311 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
312 except BaseException as ex:
313 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
318 def import_and_run_main(module, args):
321 f = compile('module.main(args)', __file__, 'exec')
322 cProfile.runctx(f, globals(), locals())
327 def run_module_cmd(module, args):
328 if not (fix_stdout or fix_stderr):
329 import_and_run_main(module, args)
331 # Interpose filter_output between all attempts to write to the
332 # stdout/stderr and the real stdout/stderr (e.g. the fds that
333 # connect directly to the terminal) via a thread that runs
334 # filter_output in a pipeline.
337 real_out_fd = real_err_fd = stdout_pipe = stderr_pipe = None
338 filter_thread = filter_thread_started = None
343 stdout_pipe = os.pipe() # monitored_by_filter, stdout_everyone_uses
344 real_out_fd = os.dup(sys.stdout.fileno())
345 os.dup2(stdout_pipe[1], sys.stdout.fileno())
346 srcs.append(stdout_pipe[0])
347 dests.append(real_out_fd)
350 stderr_pipe = os.pipe() # monitored_by_filter, stderr_everyone_uses
351 real_err_fd = os.dup(sys.stderr.fileno())
352 os.dup2(stderr_pipe[1], sys.stderr.fileno())
353 srcs.append(stderr_pipe[0])
354 dests.append(real_err_fd)
356 filter_thread = Thread(name='output filter',
357 target=lambda : filter_output(srcs, dests))
358 filter_thread.start()
359 filter_thread_started = True
360 import_and_run_main(module, args)
361 except Exception as ex:
366 # Try to make sure that whatever else happens, we restore
367 # stdout and stderr here, if that's possible, so that we don't
368 # risk just losing some output.
370 real_out_fd is not None and os.dup2(real_out_fd, sys.stdout.fileno())
371 except Exception as ex:
373 add_ex_ctx(ex, pending_ex)
375 real_err_fd is not None and os.dup2(real_err_fd, sys.stderr.fileno())
376 except Exception as ex:
378 add_ex_ctx(ex, pending_ex)
381 stdout_pipe is not None and os.close(stdout_pipe[1])
382 except Exception as ex:
384 add_ex_ctx(ex, pending_ex)
386 stderr_pipe is not None and os.close(stderr_pipe[1])
387 except Exception as ex:
389 add_ex_ctx(ex, pending_ex)
392 except Exception as ex:
394 add_ex_ctx(ex, pending_ex)
397 # There's no point in trying to join unless we finished the finally block.
398 if filter_thread_started:
402 def run_subproc_cmd(args):
404 c = (do_profile and [sys.executable, b'-m', b'cProfile'] or []) + args
405 if not (fix_stdout or fix_stderr):
410 out = byte_stream(sys.stdout)
411 err = byte_stream(sys.stderr)
414 p = subprocess.Popen(c,
415 stdout=PIPE if fix_stdout else out,
416 stderr=PIPE if fix_stderr else err,
417 env=tty_env, bufsize=4096, close_fds=True)
418 # Assume p will receive these signals and quit, which will
419 # then cause us to quit.
420 for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
421 signal.signal(sig, signal.SIG_IGN)
426 srcs.append(p.stdout.fileno())
427 dests.append(out.fileno())
429 srcs.append(p.stderr.fileno())
430 dests.append(err.fileno())
431 filter_output(srcs, dests)
433 except BaseException as ex:
436 if p and p.poll() == None:
437 os.kill(p.pid, signal.SIGTERM)
439 except BaseException as kill_ex:
440 raise add_ex_ctx(add_ex_tb(kill_ex), ex)
444 def run_subcmd(module, args):
446 run_module_cmd(module, args)
448 run_subproc_cmd(args)
451 wrap_main(lambda : run_subcmd(cmd_module, subcmd))