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',
196 raise ModuleNotFoundError()
197 cmd_module = import_module('bup.cmd.'
198 + subcmd_name.decode('ascii').replace('-', '_'))
199 except ModuleNotFoundError as ex:
203 subcmd[0] = os.path.join(cmdpath, b'bup-' + subcmd_name)
204 if not os.path.exists(subcmd[0]):
205 subcmd[0] = b'%s/%s.py' % (transition_cmdpath,
206 subcmd_name.replace(b'-', b'_'))
207 if not os.path.exists(subcmd[0]):
208 usage('error: unknown command "%s"' % path_msg(subcmd_name))
210 already_fixed = int(environ.get(b'BUP_FORCE_TTY', 0))
211 if subcmd_name in [b'mux', b'ftp', b'help']:
213 fix_stdout = not already_fixed and os.isatty(1)
214 fix_stderr = not already_fixed and os.isatty(2)
216 if fix_stdout or fix_stderr:
217 tty_env = merge_dict(environ,
218 {b'BUP_FORCE_TTY': (b'%d'
219 % ((fix_stdout and 1 or 0)
220 + (fix_stderr and 2 or 0))),
221 b'BUP_TTY_WIDTH': b'%d' % _tty_width(), })
226 sep_rx = re.compile(br'([\r\n])')
228 def print_clean_line(dest, content, width, sep=None):
229 """Write some or all of content, followed by sep, to the dest fd after
230 padding the content with enough spaces to fill the current
231 terminal width or truncating it to the terminal width if sep is a
234 assert sep in (b'\r', b'\n', None)
240 assert not sep_rx.match(x)
241 content = b''.join(content)
242 if sep == b'\r' and len(content) > width:
243 content = content[width:]
244 os.write(dest, content)
245 if len(content) < width:
246 os.write(dest, b' ' * (width - len(content)))
250 def filter_output(srcs, dests):
251 """Transfer data from file descriptors in srcs to the corresponding
252 file descriptors in dests print_clean_line until all of the srcs
257 assert all(type(x) in int_types for x in srcs)
258 assert all(type(x) in int_types for x in srcs)
259 assert len(srcs) == len(dests)
261 dest_for = dict(zip(srcs, dests))
266 ready_fds, _, _ = select.select(srcs, [], [])
269 buf = os.read(fd, 4096)
272 srcs = tuple([x for x in srcs if x is not fd])
273 print_clean_line(dest, pending.pop(fd, []), width)
275 split = sep_rx.split(buf)
276 while len(split) > 1:
277 content, sep = split[:2]
279 print_clean_line(dest,
280 pending.pop(fd, []) + [content],
283 assert len(split) == 1
285 pending.setdefault(fd, []).extend(split)
286 except BaseException as ex:
287 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
289 # Try to finish each of the streams
290 for fd, pending_items in compat.items(pending):
294 print_clean_line(dest, pending_items, width)
295 except (EnvironmentError, EOFError) as ex:
296 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
297 except BaseException as ex:
298 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
303 def import_and_run_main(module, args):
306 f = compile('module.main(args)', __file__, 'exec')
307 cProfile.runctx(f, globals(), locals())
312 def run_module_cmd(module, args):
313 if not (fix_stdout or fix_stderr):
314 import_and_run_main(module, args)
316 # Interpose filter_output between all attempts to write to the
317 # stdout/stderr and the real stdout/stderr (e.g. the fds that
318 # connect directly to the terminal) via a thread that runs
319 # filter_output in a pipeline.
322 real_out_fd = real_err_fd = stdout_pipe = stderr_pipe = None
323 filter_thread = filter_thread_started = None
328 stdout_pipe = os.pipe() # monitored_by_filter, stdout_everyone_uses
329 real_out_fd = os.dup(sys.stdout.fileno())
330 os.dup2(stdout_pipe[1], sys.stdout.fileno())
331 srcs.append(stdout_pipe[0])
332 dests.append(real_out_fd)
335 stderr_pipe = os.pipe() # monitored_by_filter, stderr_everyone_uses
336 real_err_fd = os.dup(sys.stderr.fileno())
337 os.dup2(stderr_pipe[1], sys.stderr.fileno())
338 srcs.append(stderr_pipe[0])
339 dests.append(real_err_fd)
341 filter_thread = Thread(name='output filter',
342 target=lambda : filter_output(srcs, dests))
343 filter_thread.start()
344 filter_thread_started = True
345 import_and_run_main(module, args)
346 except Exception as ex:
351 # Try to make sure that whatever else happens, we restore
352 # stdout and stderr here, if that's possible, so that we don't
353 # risk just losing some output.
355 real_out_fd is not None and os.dup2(real_out_fd, sys.stdout.fileno())
356 except Exception as ex:
358 add_ex_ctx(ex, pending_ex)
360 real_err_fd is not None and os.dup2(real_err_fd, sys.stderr.fileno())
361 except Exception as ex:
363 add_ex_ctx(ex, pending_ex)
366 stdout_pipe is not None and os.close(stdout_pipe[1])
367 except Exception as ex:
369 add_ex_ctx(ex, pending_ex)
371 stderr_pipe is not None and os.close(stderr_pipe[1])
372 except Exception as ex:
374 add_ex_ctx(ex, pending_ex)
377 except Exception as ex:
379 add_ex_ctx(ex, pending_ex)
382 # There's no point in trying to join unless we finished the finally block.
383 if filter_thread_started:
387 def run_subproc_cmd(args):
389 c = (do_profile and [sys.executable, b'-m', b'cProfile'] or []) + args
390 if not (fix_stdout or fix_stderr):
395 out = byte_stream(sys.stdout)
396 err = byte_stream(sys.stderr)
399 p = subprocess.Popen(c,
400 stdout=PIPE if fix_stdout else out,
401 stderr=PIPE if fix_stderr else err,
402 env=tty_env, bufsize=4096, close_fds=True)
403 # Assume p will receive these signals and quit, which will
404 # then cause us to quit.
405 for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
406 signal.signal(sig, signal.SIG_IGN)
411 srcs.append(p.stdout.fileno())
412 dests.append(out.fileno())
414 srcs.append(p.stderr.fileno())
415 dests.append(err.fileno())
416 filter_output(srcs, dests)
418 except BaseException as ex:
421 if p and p.poll() == None:
422 os.kill(p.pid, signal.SIGTERM)
424 except BaseException as kill_ex:
425 raise add_ex_ctx(add_ex_tb(kill_ex), ex)
429 def run_subcmd(module, args):
431 run_module_cmd(module, args)
433 run_subproc_cmd(args)
436 wrap_main(lambda : run_subcmd(cmd_module, subcmd))