"""
# end of bup preamble
-import sys, os, subprocess, signal, getopt
+import errno, re, sys, os, subprocess, signal, getopt
+from fcntl import F_GETFL, F_SETFL
+from subprocess import PIPE
+from sys import stderr, stdout
+import fcntl, select
argv = sys.argv
exe = os.path.realpath(argv[0])
from bup import helpers
-from bup.compat import wrap_main
+from bup.compat import add_ex_tb, chain_ex, wrap_main
from bup.helpers import atoi, columnate, debug1, log, tty_width
-# 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')
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
-ret = 95
-p = None
-forward_signals = True
-def handler(signum, frame):
- debug1('\nbup: signal %d received\n' % signum)
- if not p or not forward_signals:
+sep_rx = re.compile(r'([\r\n])')
+
+def print_clean_line(dest, content, width, sep=None):
+ """Write some or all of content, followed by sep, to the dest fd after
+ padding the content with enough spaces to fill the current
+ terminal width or truncating it to the terminal width if sep is a
+ carriage return."""
+ global sep_rx
+ assert sep in ('\r', '\n', None)
+ if not content:
+ if sep:
+ os.write(dest, sep)
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)
+ for x in content:
+ assert not sep_rx.match(x)
+ content = ''.join(content)
+ if sep == '\r' and len(content) > width:
+ content = content[width:]
+ os.write(dest, content)
+ if len(content) < width:
+ os.write(dest, ' ' * (width - len(content)))
+ os.write(dest, sep)
+def filter_output(src_out, src_err, dest_out, dest_err):
+ """Transfer data from src_out to dest_out and src_err to dest_err via
+ print_clean_line until src_out and src_err close."""
+ global sep_rx
+ assert not isinstance(src_out, bool)
+ assert not isinstance(src_err, bool)
+ assert not isinstance(dest_out, bool)
+ assert not isinstance(dest_err, bool)
+ assert src_out is not None or src_err is not None
+ assert (src_out is None) == (dest_out is None)
+ assert (src_err is None) == (dest_err is None)
+ pending = {}
+ pending_ex = 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.
- 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()
+ fds = tuple([x for x in (src_out, src_err) if x is not None])
+ for fd in fds:
+ flags = fcntl.fcntl(fd, F_GETFL)
+ assert fcntl.fcntl(fd, F_SETFL, flags | os.O_NONBLOCK) == 0
+ while fds:
+ ready_fds, _, _ = select.select(fds, [], [])
+ width = tty_width()
+ for fd in ready_fds:
+ buf = os.read(fd, 4096)
+ dest = dest_out if fd == src_out else dest_err
+ if not buf:
+ fds = tuple([x for x in fds if x is not fd])
+ print_clean_line(dest, pending.pop(fd, []), width)
+ else:
+ split = sep_rx.split(buf)
+ if len(split) > 2:
+ while len(split) > 1:
+ content, sep = split[:2]
+ split = split[2:]
+ print_clean_line(dest,
+ pending.pop(fd, []) + [content],
+ width,
+ sep)
+ else:
+ assert(len(split) == 1)
+ pending.setdefault(fd, []).extend(split)
+ except BaseException as ex:
+ pending_ex = chain_ex(add_ex_tb(ex), pending_ex)
+ try:
+ # Try to finish each of the streams
+ for fd, pending_items in pending.iteritems():
+ dest = dest_out if fd == src_out else dest_err
try:
- n.wait()
- except:
- pass
- sys.exit(ret)
+ print_clean_line(dest, pending_items, width)
+ except (EnvironmentError, EOFError) as ex:
+ pending_ex = chain_ex(add_ex_tb(ex), pending_ex)
+ except BaseException as ex:
+ pending_ex = chain_ex(add_ex_tb(ex), pending_ex)
+ if pending_ex:
+ raise pending_ex
-wrap_main(main)
+def run_subcmd(subcmd):
+
+ c = (do_profile and [sys.executable, '-m', 'cProfile'] or []) + subcmd
+ if not (fix_stdout or fix_stderr):
+ os.execvp(c[0], c)
+
+ p = None
+ try:
+ p = subprocess.Popen(c,
+ stdout=PIPE if fix_stdout else sys.stdout,
+ stderr=PIPE if fix_stderr else sys.stderr,
+ preexec_fn=force_tty,
+ bufsize=4096,
+ close_fds=True)
+ # Assume p will receive these signals and quit, which will
+ # then cause us to quit.
+ for sig in (signal.SIGINT, signal.SIGTERM, signal.SIGQUIT):
+ signal.signal(sig, signal.SIG_IGN)
+
+ filter_output(fix_stdout and p.stdout.fileno() or None,
+ fix_stderr and p.stderr.fileno() or None,
+ fix_stdout and sys.stdout.fileno() or None,
+ fix_stderr and sys.stderr.fileno() or None)
+ return p.wait()
+ except BaseException as ex:
+ add_ex_tb(ex)
+ try:
+ if p and p.poll() == None:
+ os.kill(p.pid, signal.SIGTERM)
+ p.wait()
+ except BaseException as kill_ex:
+ raise chain_ex(add_ex_tb(kill_ex), ex)
+ raise ex
+
+wrap_main(lambda : run_subcmd(subcmd))
projects / bup.git / commitdiff