/
main.py
executable file
·199 lines (172 loc) · 6.13 KB
/
main.py
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#!/usr/bin/env python
import sys, os, subprocess, signal, getopt
argv = sys.argv
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
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.helpers import *
# after running 'bup newliner', the tty_width() ioctl won't work anymore
os.environ['WIDTH'] = str(tty_width())
def usage(msg=""):
log('Usage: bup [-?|--help] [-d BUP_DIR] [--debug] [--profile] '
'<command> [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:
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:
usage()
# Handle global options.
try:
optspec = ['help', 'version', 'debug', 'profile', 'bup-dir=']
global_args, subcmd = getopt.getopt(argv[1:], '?VDd:', optspec)
except getopt.GetoptError, 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):
sp = os.path.join(exepath, 'bup-%s' % s)
if not os.path.exists(sp):
sp = os.path.join(cmdpath, 'bup-%s' % s)
return sp
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_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:
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=drealf,
close_fds=True, preexec_fn=force_tty)
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 = None
errf = None
class SigException(Exception):
def __init__(self, signum):
self.signum = signum
Exception.__init__(self, 'signal %d received' % signum)
def handler(signum, frame):
raise SigException(signum)
signal.signal(signal.SIGTERM, handler)
signal.signal(signal.SIGINT, handler)
ret = 95
p = None
try:
try:
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.
try:
ret = p.wait()
break
except SigException, e:
log('\nbup: %s\n' % e)
os.kill(p.pid, e.signum)
ret = 94
except OSError, 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)