X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=main.py;h=33d21dfeecdd201b763bd35f01f6336da437af6a;hb=e5694a4dd6289d29d40e59ba3ca69bbb0cd2449d;hp=36f65443d2aa67f5012562321b541f74e6568e82;hpb=c2df125e36f32e00e8aaeda825688626f9371c01;p=bup.git diff --git a/main.py b/main.py index 36f6544..33d21df 100755 --- a/main.py +++ b/main.py @@ -1,31 +1,128 @@ -#!/usr/bin/env python -import sys, os, subprocess +#!/bin/sh +"""": # -*-python-*- # -*-python-*- +bup_python="$(dirname "$0")/cmd/bup-python" || exit $? +exec "$bup_python" "$0" ${1+"$@"} +""" +# end of bup preamble + +import sys, os, subprocess, signal, getopt + argv = sys.argv -exe = argv[0] +exe = os.path.realpath(argv[0]) exepath = os.path.split(exe)[0] or '.' +exeprefix = os.path.split(os.path.abspath(exepath))[0] # fix the PYTHONPATH to include our lib dir -libpath = os.path.join(exepath, 'lib') -cmdpath = os.path.join(exepath, 'cmd') +if os.path.exists("%s/lib/bup/cmd/." % exeprefix): + # installed binary in /.../bin. + # eg. /usr/bin/bup means /usr/lib/bup/... is where our libraries are. + cmdpath = "%s/lib/bup/cmd" % exeprefix + libpath = "%s/lib/bup" % exeprefix + resourcepath = libpath +else: + # running from the src directory without being installed first + cmdpath = os.path.join(exepath, 'cmd') + libpath = os.path.join(exepath, 'lib') + resourcepath = libpath sys.path[:0] = [libpath] os.environ['PYTHONPATH'] = libpath + ':' + os.environ.get('PYTHONPATH', '') +os.environ['BUP_MAIN_EXE'] = os.path.abspath(exe) +os.environ['BUP_RESOURCE_PATH'] = resourcepath + + +from bup import helpers +from bup.compat import wrap_main +from bup.helpers import atoi, columnate, debug1, log, tty_width + -from bup.helpers import * +# after running 'bup newliner', the tty_width() ioctl won't work anymore +os.environ['WIDTH'] = str(tty_width()) -def usage(): - log('Usage: bup \n\n') - log('Available subcommands:\n') +def usage(msg=""): + log('Usage: bup [-?|--help] [-d BUP_DIR] [--debug] [--profile] ' + ' [options...]\n\n') + common = dict( + ftp = 'Browse backup sets using an ftp-like client', + fsck = 'Check backup sets for damage and add redundancy information', + fuse = 'Mount your backup sets as a filesystem', + help = 'Print detailed help for the given command', + index = 'Create or display the index of files to back up', + on = 'Backup a remote machine to the local one', + restore = 'Extract files from a backup set', + save = 'Save files into a backup set (note: run "bup index" first)', + tag = 'Tag commits for easier access', + web = 'Launch a web server to examine backup sets', + ) + + log('Common commands:\n') + for cmd,synopsis in sorted(common.items()): + log(' %-10s %s\n' % (cmd, synopsis)) + log('\n') + + log('Other available commands:\n') + cmds = [] for c in sorted(os.listdir(cmdpath) + os.listdir(exepath)): if c.startswith('bup-') and c.find('.') < 0: - log('\t%s\n' % c[4:]) + cname = c[4:] + if cname not in common: + cmds.append(c[4:]) + log(columnate(cmds, ' ')) + log('\n') + + log("See 'bup help COMMAND' for more information on " + + "a specific command.\n") + if msg: + log("\n%s\n" % msg) sys.exit(99) -if len(argv) < 2 or not argv[1] or argv[1][0] == '-': + +if len(argv) < 2: usage() -subcmd = argv[1] -if subcmd == 'help': +# Handle global options. +try: + optspec = ['help', 'version', 'debug', 'profile', 'bup-dir='] + global_args, subcmd = getopt.getopt(argv[1:], '?VDd:', optspec) +except getopt.GetoptError as ex: + usage('error: %s' % ex.msg) + +help_requested = None +do_profile = False + +for opt in global_args: + if opt[0] in ['-?', '--help']: + help_requested = True + elif opt[0] in ['-V', '--version']: + subcmd = ['version'] + elif opt[0] in ['-D', '--debug']: + helpers.buglvl += 1 + os.environ['BUP_DEBUG'] = str(helpers.buglvl) + elif opt[0] in ['--profile']: + do_profile = True + elif opt[0] in ['-d', '--bup-dir']: + os.environ['BUP_DIR'] = opt[1] + else: + usage('error: unexpected option "%s"' % opt[0]) + +# Make BUP_DIR absolute, so we aren't affected by chdir (i.e. save -C, etc.). +if 'BUP_DIR' in os.environ: + os.environ['BUP_DIR'] = os.path.abspath(os.environ['BUP_DIR']) + +if len(subcmd) == 0: + if help_requested: + subcmd = ['help'] + else: + usage() + +if help_requested and subcmd[0] != 'help': + subcmd = ['help'] + subcmd + +if len(subcmd) > 1 and subcmd[1] == '--help' and subcmd[0] != 'help': + subcmd = ['help', subcmd[0]] + subcmd[2:] + +subcmd_name = subcmd[0] +if not subcmd_name: usage() def subpath(s): @@ -34,49 +131,88 @@ def subpath(s): sp = os.path.join(cmdpath, 'bup-%s' % s) return sp -if not os.path.exists(subpath(subcmd)): - log('error: unknown command "%s"\n' % subcmd) - usage() - +subcmd[0] = subpath(subcmd_name) +if not os.path.exists(subcmd[0]): + usage('error: unknown command "%s"' % subcmd_name) already_fixed = atoi(os.environ.get('BUP_FORCE_TTY')) -if subcmd in ['ftp']: +if subcmd_name in ['mux', 'ftp', 'help']: already_fixed = True fix_stdout = not already_fixed and os.isatty(1) fix_stderr = not already_fixed and os.isatty(2) def force_tty(): if fix_stdout or fix_stderr: - os.environ['BUP_FORCE_TTY'] = '1' + amt = (fix_stdout and 1 or 0) + (fix_stderr and 2 or 0) + os.environ['BUP_FORCE_TTY'] = str(amt) + os.setsid() # make sure ctrl-c is sent just to us, not to child too if fix_stdout or fix_stderr: realf = fix_stderr and 2 or 1 + drealf = os.dup(realf) # Popen goes crazy with stdout=2 n = subprocess.Popen([subpath('newliner')], - stdin=subprocess.PIPE, stdout=os.dup(realf), + stdin=subprocess.PIPE, stdout=drealf, close_fds=True, preexec_fn=force_tty) - outf = fix_stdout and n.stdin.fileno() or 1 - errf = fix_stderr and n.stdin.fileno() or 2 + os.close(drealf) + outf = fix_stdout and n.stdin.fileno() or None + errf = fix_stderr and n.stdin.fileno() or None else: n = None - outf = 1 - errf = 2 + outf = None + errf = None ret = 95 -try: +p = None +forward_signals = True + +def handler(signum, frame): + debug1('\nbup: signal %d received\n' % signum) + if not p or not forward_signals: + return + if signum != signal.SIGTSTP: + os.kill(p.pid, signum) + else: # SIGTSTP: stop the child, then ourselves. + os.kill(p.pid, signal.SIGSTOP) + signal.signal(signal.SIGTSTP, signal.SIG_DFL) + os.kill(os.getpid(), signal.SIGTSTP) + # Back from suspend -- reestablish the handler. + signal.signal(signal.SIGTSTP, handler) + ret = 94 + +def main(): + signal.signal(signal.SIGTERM, handler) + signal.signal(signal.SIGINT, handler) + signal.signal(signal.SIGTSTP, handler) + signal.signal(signal.SIGCONT, handler) + try: - p = subprocess.Popen([subpath(subcmd)] + argv[2:], - stdout=outf, stderr=errf, preexec_fn=force_tty) - ret = p.wait() - except OSError, e: - log('%s: %s\n' % (subpath(subcmd), e)) - ret = 98 - except KeyboardInterrupt, e: - ret = 94 -finally: - if n: - n.stdin.close() try: - n.wait() - except: - pass -sys.exit(ret) + c = (do_profile and [sys.executable, '-m', 'cProfile'] or []) + subcmd + if not n and not outf and not errf: + # shortcut when no bup-newliner stuff is needed + os.execvp(c[0], c) + else: + p = subprocess.Popen(c, stdout=outf, stderr=errf, + preexec_fn=force_tty) + while 1: + # if we get a signal while waiting, we have to keep waiting, just + # in case our child doesn't die. + ret = p.wait() + forward_signals = False + break + except OSError as e: + log('%s: %s\n' % (subcmd[0], e)) + ret = 98 + finally: + if p and p.poll() == None: + os.kill(p.pid, signal.SIGTERM) + p.wait() + if n: + n.stdin.close() + try: + n.wait() + except: + pass + sys.exit(ret) + +wrap_main(main)