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'cat-file',
190 raise ModuleNotFoundError()
191 cmd_module = import_module('bup.cmd.'
192 + subcmd_name.decode('ascii').replace('-', '_'))
193 except ModuleNotFoundError as ex:
197 subcmd[0] = os.path.join(cmdpath, b'bup-' + subcmd_name)
198 if not os.path.exists(subcmd[0]):
199 subcmd[0] = b'%s/%s.py' % (transition_cmdpath,
200 subcmd_name.replace(b'-', b'_'))
201 if not os.path.exists(subcmd[0]):
202 usage('error: unknown command "%s"' % path_msg(subcmd_name))
204 already_fixed = int(environ.get(b'BUP_FORCE_TTY', 0))
205 if subcmd_name in [b'mux', b'ftp', b'help']:
207 fix_stdout = not already_fixed and os.isatty(1)
208 fix_stderr = not already_fixed and os.isatty(2)
210 if fix_stdout or fix_stderr:
211 tty_env = merge_dict(environ,
212 {b'BUP_FORCE_TTY': (b'%d'
213 % ((fix_stdout and 1 or 0)
214 + (fix_stderr and 2 or 0))),
215 b'BUP_TTY_WIDTH': b'%d' % _tty_width(), })
220 sep_rx = re.compile(br'([\r\n])')
222 def print_clean_line(dest, content, width, sep=None):
223 """Write some or all of content, followed by sep, to the dest fd after
224 padding the content with enough spaces to fill the current
225 terminal width or truncating it to the terminal width if sep is a
228 assert sep in (b'\r', b'\n', None)
234 assert not sep_rx.match(x)
235 content = b''.join(content)
236 if sep == b'\r' and len(content) > width:
237 content = content[width:]
238 os.write(dest, content)
239 if len(content) < width:
240 os.write(dest, b' ' * (width - len(content)))
244 def filter_output(srcs, dests):
245 """Transfer data from file descriptors in srcs to the corresponding
246 file descriptors in dests print_clean_line until all of the srcs
251 assert all(type(x) in int_types for x in srcs)
252 assert all(type(x) in int_types for x in srcs)
253 assert len(srcs) == len(dests)
255 dest_for = dict(zip(srcs, dests))
260 ready_fds, _, _ = select.select(srcs, [], [])
263 buf = os.read(fd, 4096)
266 srcs = tuple([x for x in srcs if x is not fd])
267 print_clean_line(dest, pending.pop(fd, []), width)
269 split = sep_rx.split(buf)
270 while len(split) > 1:
271 content, sep = split[:2]
273 print_clean_line(dest,
274 pending.pop(fd, []) + [content],
277 assert len(split) == 1
279 pending.setdefault(fd, []).extend(split)
280 except BaseException as ex:
281 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
283 # Try to finish each of the streams
284 for fd, pending_items in compat.items(pending):
288 print_clean_line(dest, pending_items, width)
289 except (EnvironmentError, EOFError) as ex:
290 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
291 except BaseException as ex:
292 pending_ex = add_ex_ctx(add_ex_tb(ex), pending_ex)
297 def import_and_run_main(module, args):
300 f = compile('module.main(args)', __file__, 'exec')
301 cProfile.runctx(f, globals(), locals())
306 def run_module_cmd(module, args):
307 if not (fix_stdout or fix_stderr):
308 import_and_run_main(module, args)
310 # Interpose filter_output between all attempts to write to the
311 # stdout/stderr and the real stdout/stderr (e.g. the fds that
312 # connect directly to the terminal) via a thread that runs
313 # filter_output in a pipeline.
316 real_out_fd = real_err_fd = stdout_pipe = stderr_pipe = None
317 filter_thread = filter_thread_started = None
322 stdout_pipe = os.pipe() # monitored_by_filter, stdout_everyone_uses
323 real_out_fd = os.dup(sys.stdout.fileno())
324 os.dup2(stdout_pipe[1], sys.stdout.fileno())
325 srcs.append(stdout_pipe[0])
326 dests.append(real_out_fd)
329 stderr_pipe = os.pipe() # monitored_by_filter, stderr_everyone_uses
330 real_err_fd = os.dup(sys.stderr.fileno())
331 os.dup2(stderr_pipe[1], sys.stderr.fileno())
332 srcs.append(stderr_pipe[0])
333 dests.append(real_err_fd)
335 filter_thread = Thread(name='output filter',
336 target=lambda : filter_output(srcs, dests))
337 filter_thread.start()
338 filter_thread_started = True
339 import_and_run_main(module, args)
340 except Exception as ex:
345 # Try to make sure that whatever else happens, we restore
346 # stdout and stderr here, if that's possible, so that we don't
347 # risk just losing some output.
349 real_out_fd is not None and os.dup2(real_out_fd, sys.stdout.fileno())
350 except Exception as ex:
352 add_ex_ctx(ex, pending_ex)
354 real_err_fd is not None and os.dup2(real_err_fd, sys.stderr.fileno())
355 except Exception as ex:
357 add_ex_ctx(ex, pending_ex)
360 stdout_pipe is not None and os.close(stdout_pipe[1])
361 except Exception as ex:
363 add_ex_ctx(ex, pending_ex)
365 stderr_pipe is not None and os.close(stderr_pipe[1])
366 except Exception as ex:
368 add_ex_ctx(ex, pending_ex)
371 except Exception as ex:
373 add_ex_ctx(ex, pending_ex)
376 # There's no point in trying to join unless we finished the finally block.
377 if filter_thread_started:
381 def run_subproc_cmd(args):
383 c = (do_profile and [sys.executable, b'-m', b'cProfile'] or []) + args
384 if not (fix_stdout or fix_stderr):
389 out = byte_stream(sys.stdout)
390 err = byte_stream(sys.stderr)
393 p = subprocess.Popen(c,
394 stdout=PIPE if fix_stdout else out,
395 stderr=PIPE if fix_stderr else err,
396 env=tty_env, bufsize=4096, close_fds=True)
397 # Assume p will receive these signals and quit, which will
398 # then cause us to quit.
399 for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
400 signal.signal(sig, signal.SIG_IGN)
405 srcs.append(p.stdout.fileno())
406 dests.append(out.fileno())
408 srcs.append(p.stderr.fileno())
409 dests.append(err.fileno())
410 filter_output(srcs, dests)
412 except BaseException as ex:
415 if p and p.poll() == None:
416 os.kill(p.pid, signal.SIGTERM)
418 except BaseException as kill_ex:
419 raise add_ex_ctx(add_ex_tb(kill_ex), ex)
423 def run_subcmd(module, args):
425 run_module_cmd(module, args)
427 run_subproc_cmd(args)
430 wrap_main(lambda : run_subcmd(cmd_module, subcmd))