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',
209 raise ModuleNotFoundError()
210 cmd_module = import_module('bup.cmd.'
211 + subcmd_name.decode('ascii').replace('-', '_'))
212 except ModuleNotFoundError as ex:
216 subcmd[0] = os.path.join(cmdpath, b'bup-' + subcmd_name)
217 if not os.path.exists(subcmd[0]):
218 subcmd[0] = b'%s/%s.py' % (transition_cmdpath,
219 subcmd_name.replace(b'-', b'_'))
220 if not os.path.exists(subcmd[0]):
221 usage('error: unknown command "%s"' % path_msg(subcmd_name))
223 already_fixed = int(environ.get(b'BUP_FORCE_TTY', 0))
224 if subcmd_name in [b'mux', b'ftp', b'help']:
226 fix_stdout = not already_fixed and os.isatty(1)
227 fix_stderr = not already_fixed and os.isatty(2)
229 if fix_stdout or fix_stderr:
230 tty_env = merge_dict(environ,
231 {b'BUP_FORCE_TTY': (b'%d'
232 % ((fix_stdout and 1 or 0)
233 + (fix_stderr and 2 or 0))),
234 b'BUP_TTY_WIDTH': b'%d' % _tty_width(), })
239 sep_rx = re.compile(br'([\r\n])')
241 def print_clean_line(dest, content, width, sep=None):
242 """Write some or all of content, followed by sep, to the dest fd after
243 padding the content with enough spaces to fill the current
244 terminal width or truncating it to the terminal width if sep is a
247 assert sep in (b'\r', b'\n', None)
253 assert not sep_rx.match(x)
254 content = b''.join(content)
255 if sep == b'\r' and len(content) > width:
256 content = content[width:]
257 os.write(dest, content)
258 if len(content) < width:
259 os.write(dest, b' ' * (width - len(content)))
263 def filter_output(srcs, dests):
264 """Transfer data from file descriptors in srcs to the corresponding
265 file descriptors in dests print_clean_line until all of the srcs
270 assert all(type(x) in int_types for x in srcs)
271 assert all(type(x) in int_types for x in srcs)
272 assert len(srcs) == len(dests)
274 dest_for = dict(zip(srcs, dests))
279 ready_fds, _, _ = select.select(srcs, [], [])
282 buf = os.read(fd, 4096)
285 srcs = tuple([x for x in srcs if x is not fd])
286 print_clean_line(dest, pending.pop(fd, []), width)
288 split = sep_rx.split(buf)
289 while len(split) > 1:
290 content, sep = split[:2]
292 print_clean_line(dest,
293 pending.pop(fd, []) + [content],
296 assert len(split) == 1
298 pending.setdefault(fd, []).extend(split)
299 except BaseException as ex:
300 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
302 # Try to finish each of the streams
303 for fd, pending_items in compat.items(pending):
307 print_clean_line(dest, pending_items, width)
308 except (EnvironmentError, EOFError) as ex:
309 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
310 except BaseException as ex:
311 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
316 def import_and_run_main(module, args):
319 f = compile('module.main(args)', __file__, 'exec')
320 cProfile.runctx(f, globals(), locals())
325 def run_module_cmd(module, args):
326 if not (fix_stdout or fix_stderr):
327 import_and_run_main(module, args)
329 # Interpose filter_output between all attempts to write to the
330 # stdout/stderr and the real stdout/stderr (e.g. the fds that
331 # connect directly to the terminal) via a thread that runs
332 # filter_output in a pipeline.
335 real_out_fd = real_err_fd = stdout_pipe = stderr_pipe = None
336 filter_thread = filter_thread_started = None
341 stdout_pipe = os.pipe() # monitored_by_filter, stdout_everyone_uses
342 real_out_fd = os.dup(sys.stdout.fileno())
343 os.dup2(stdout_pipe[1], sys.stdout.fileno())
344 srcs.append(stdout_pipe[0])
345 dests.append(real_out_fd)
348 stderr_pipe = os.pipe() # monitored_by_filter, stderr_everyone_uses
349 real_err_fd = os.dup(sys.stderr.fileno())
350 os.dup2(stderr_pipe[1], sys.stderr.fileno())
351 srcs.append(stderr_pipe[0])
352 dests.append(real_err_fd)
354 filter_thread = Thread(name='output filter',
355 target=lambda : filter_output(srcs, dests))
356 filter_thread.start()
357 filter_thread_started = True
358 import_and_run_main(module, args)
359 except Exception as ex:
364 # Try to make sure that whatever else happens, we restore
365 # stdout and stderr here, if that's possible, so that we don't
366 # risk just losing some output.
368 real_out_fd is not None and os.dup2(real_out_fd, sys.stdout.fileno())
369 except Exception as ex:
371 add_ex_ctx(ex, pending_ex)
373 real_err_fd is not None and os.dup2(real_err_fd, sys.stderr.fileno())
374 except Exception as ex:
376 add_ex_ctx(ex, pending_ex)
379 stdout_pipe is not None and os.close(stdout_pipe[1])
380 except Exception as ex:
382 add_ex_ctx(ex, pending_ex)
384 stderr_pipe is not None and os.close(stderr_pipe[1])
385 except Exception as ex:
387 add_ex_ctx(ex, pending_ex)
390 except Exception as ex:
392 add_ex_ctx(ex, pending_ex)
395 # There's no point in trying to join unless we finished the finally block.
396 if filter_thread_started:
400 def run_subproc_cmd(args):
402 c = (do_profile and [sys.executable, b'-m', b'cProfile'] or []) + args
403 if not (fix_stdout or fix_stderr):
408 out = byte_stream(sys.stdout)
409 err = byte_stream(sys.stderr)
412 p = subprocess.Popen(c,
413 stdout=PIPE if fix_stdout else out,
414 stderr=PIPE if fix_stderr else err,
415 env=tty_env, bufsize=4096, close_fds=True)
416 # Assume p will receive these signals and quit, which will
417 # then cause us to quit.
418 for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
419 signal.signal(sig, signal.SIG_IGN)
424 srcs.append(p.stdout.fileno())
425 dests.append(out.fileno())
427 srcs.append(p.stderr.fileno())
428 dests.append(err.fileno())
429 filter_output(srcs, dests)
431 except BaseException as ex:
434 if p and p.poll() == None:
435 os.kill(p.pid, signal.SIGTERM)
437 except BaseException as kill_ex:
438 raise add_ex_ctx(add_ex_tb(kill_ex), ex)
442 def run_subcmd(module, args):
444 run_module_cmd(module, args)
446 run_subproc_cmd(args)
449 wrap_main(lambda : run_subcmd(cmd_module, subcmd))