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builder.py
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builder.py
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import sys, os, errno, stat
import vars, state, jwack, deps, logger
from helpers import unlink, close_on_exec, join
from log import log, log_e, debug, debug2, debug3, err, warn, log_cmd
def _default_do_files(filename):
l = filename.split('.')
for i in range(1,len(l)+1):
basename = join('.', l[:i])
ext = join('.', l[i:])
if ext: ext = '.' + ext
yield ("default%s.do" % ext), basename, ext
def _possible_do_files(t):
dirname,filename = os.path.split(t)
yield (dirname, "%s.do" % filename, '', filename, '')
yield (dirname, "%s.do" % filename, '', filename, '')
# It's important to try every possibility in a directory before resorting
# to a parent directory. Think about nested projects: I don't want
# ../../default.o.do to take precedence over ../default.do, because
# the former one might just be an artifact of someone embedding my project
# into theirs as a subdir. When they do, my rules should still be used
# for building my project in *all* cases.
dirbits = os.path.abspath(dirname).split('/')
for i in range(len(dirbits), -1, -1):
basedir = os.path.join(dirname,
join('/', ['..'] * (len(dirbits) - i)))
subdir = join('/', dirbits[i:])
for dofile,basename,ext in _default_do_files(filename):
yield (basedir, dofile,
subdir, os.path.join(subdir, basename), ext)
def _possible_do_files_in_do_dir(t):
for dodir,dofile,basedir,basename,ext in _possible_do_files(t):
yield (dodir,dofile,basedir,basename,ext)
yield (dodir+"/do", dofile, "../"+basedir, basename, ext)
def _find_do_file(f):
for dodir,dofile,basedir,basename,ext in _possible_do_files_in_do_dir(f.name):
if dodir and not os.path.isdir(dodir):
# we don't want to normpath() unless we have no other choice.
# otherwise we could have odd behaviour with symlinks (ie.
# x/y/../z might not be the same as x/z). On the other hand,
# if one of the path elements doesn't exist (yet), normpath
# can help us find the .do file anyway, and that .do file might
# create the sub-path.
dodir = os.path.normpath(dodir)
dopath = os.path.join(dodir, dofile)
debug2('%s: %s:%s ?\n', f.name, dodir, dofile)
dof = state.File(dopath)
if os.path.exists(dopath):
f.add_dep(dof)
return dodir,dofile,basedir,basename,ext
else:
f.add_dep(dof)
return None,None,None,None,None
def _try_stat(filename):
try:
return os.stat(filename)
except OSError, e:
if e.errno == errno.ENOENT:
return None
else:
raise
def _interpreter_locations(dodir):
dodir = os.path.realpath(dodir)
dirbits = dodir.split('/')
for i in range(len(dirbits), -1, -1):
d = join('/', dirbits[:i])
yield(d)
yield(d + "/do")
def _find_interpreter(dodir, name):
for d in _interpreter_locations(dodir):
interp = os.path.join(d, name)
if (os.path.exists(interp) and
not os.path.isdir(interp) and
os.access(interp, os.X_OK)):
debug("interpreter found: %s\n", interp)
return interp
else:
debug("interpreter not found: %s\n", interp)
class BuildJob:
def __init__(self, target, result, add_dep_to=None, delegate=None, re_do=True):
self.target = target
self.result = result
self.parent = add_dep_to
self.delegate = delegate
self.re_do = re_do
def prepare(self):
assert self.target.dolock().owned == state.LOCK_EX
self.target.build_starting()
self.before_t = _try_stat(self.target.name)
newstamp = self.target.read_stamp()
if newstamp.is_override_or_missing(self.target):
if newstamp.is_missing():
# was marked generated, but is now deleted
debug3('oldstamp=%r newstamp=%r\n', self.target.stamp, newstamp)
self.target.forget()
self.target.refresh()
elif vars.OVERWRITE:
warn('%s: you modified it; overwrite\n', self.target.printable_name())
else:
warn('%s: you modified it; skipping\n', self.target.printable_name())
return 0
if self.target.exists_not_dir() and not self.target.is_generated:
# an existing source file that was not generated by us.
# This step is mentioned by djb in his notes.
# For example, a rule called default.c.do could be used to try
# to produce hello.c, but we don't want that to happen if
# hello.c was created in advance by the end user.
if vars.OVERWRITE:
warn('%s: exists and not marked as generated; overwrite.\n',
self.target.printable_name())
else:
warn('%s: exists and not marked as generated; not redoing.\n',
self.target.printable_name())
debug2('-- static (%r)\n', self.target.name)
return 0
(self.dodir, self.dofile, self.dobasedir, self.dobasename, self.doext) = _find_do_file(self.target)
if not self.dofile:
if newstamp.is_missing():
err('no rule to make %r\n', self.target.name)
return 1
else:
self.target.forget()
debug2('-- forget (%r)\n', self.target.name)
return 0 # no longer a generated target, but exists, so ok
self.outdir = self._mkoutdir()
# name connected to stdout
self.tmpname_sout = self.target.tmpfilename('out.tmp')
# name provided as $3
self.tmpname_arg3 = os.path.join(self.outdir, self.target.basename())
# name for the log file
unlink(self.tmpname_sout)
unlink(self.tmpname_arg3)
self.log_fd = logger.open_log(self.target, truncate=True)
self.tmp_sout_fd = os.open(self.tmpname_sout, os.O_CREAT|os.O_RDWR|os.O_EXCL, 0666)
close_on_exec(self.tmp_sout_fd, True)
self.tmp_sout_f = os.fdopen(self.tmp_sout_fd, 'w+')
return None
def _mkoutdir(self):
outdir = self.target.tmpfilename("out")
if os.path.exists(outdir):
import shutil
shutil.rmtree(outdir)
os.makedirs(outdir)
return outdir
def build(self):
debug3('running build job for %r\n', self.target.name)
(dodir, dofile, basedir, basename, ext) = (
self.dodir, self.dofile, self.dobasedir, self.dobasename, self.doext)
# this will run in the dofile's directory, so use only basenames here
if vars.OLD_ARGS:
arg1 = basename # target name (no extension)
arg2 = ext # extension (if any), including leading dot
else:
arg1 = basename + ext # target name (including extension)
arg2 = basename # target name (without extension)
argv = ['sh', '-e',
dofile,
arg1,
arg2,
# temp output file name
os.path.relpath(self.tmpname_arg3, dodir),
]
if vars.VERBOSE: argv[1] += 'v'
if vars.XTRACE: argv[1] += 'x'
if vars.VERBOSE or vars.XTRACE: log_e('\n')
firstline = open(os.path.join(dodir, dofile)).readline().strip()
if firstline.startswith('#!.../'):
_, _, interp_argv = firstline.partition("/")
interp_argv = interp_argv.split(' ')
interpreter = _find_interpreter(self.dodir, interp_argv[0])
if not interpreter:
err('%s unable to find interpreter %s.\n', self.dofile, interp_argv[0])
os._exit(208)
self.target.add_dep(state.File(interpreter))
argv[0:2] = [interpreter] + interp_argv[1:]
elif firstline.startswith('#!/'):
argv[0:2] = firstline[2:].split(' ')
log('%s\n', self.target.printable_name())
log_cmd("redo", self.target.name + "\n")
try:
dn = dodir
os.environ['REDO_PWD'] = os.path.join(vars.PWD, dn)
os.environ['REDO_TARGET'] = basename + ext
os.environ['REDO_DEPTH'] = vars.DEPTH + ' '
if dn:
os.chdir(dn)
l = logger.Logger(self.log_fd, self.tmp_sout_fd)
l.fork()
os.close(self.tmp_sout_fd)
close_on_exec(1, False)
if vars.VERBOSE or vars.XTRACE: log_e('* %s\n' % ' '.join(argv))
os.execvp(argv[0], argv)
except:
import traceback
sys.stderr.write(traceback.format_exc())
err('internal exception - see above\n')
raise
finally:
# returns only if there's an exception (exec in other case)
os._exit(127)
def done(self, t, rv):
assert self.target.dolock().owned == state.LOCK_EX
log_cmd("redo_done", self.target.name + "\n")
try:
after_t = _try_stat(self.target.name)
st1 = os.fstat(self.tmp_sout_f.fileno())
st2 = _try_stat(self.tmpname_arg3)
if (after_t and
(not self.before_t or self.before_t.st_ctime != after_t.st_ctime) and
not stat.S_ISDIR(after_t.st_mode)):
err('%s modified %s directly!\n', self.dofile, self.target.name)
err('...you should update $3 (a temp file) or stdout, not $1.\n')
rv = 206
elif vars.OLD_STDOUT and st2 and st1.st_size > 0:
err('%s wrote to stdout *and* created $3.\n', self.dofile)
err('...you should write status messages to stderr, not stdout.\n')
rv = 207
elif vars.WARN_STDOUT and st1.st_size > 0:
err('%s wrote to stdout, this is not longer supported.\n', self.dofile)
err('...you should write status messages to stderr, not stdout.\n')
err('...you should write target content to $3 using for example \'exec >"$3"`.\n')
if not vars.OLD_STDOUT: rv = 207
if rv==0:
if st2:
os.rename(self.tmpname_arg3, self.target.name)
os.unlink(self.tmpname_sout)
elif vars.OLD_STDOUT and st1.st_size > 0:
try:
os.rename(self.tmpname_sout, self.target.name)
except OSError, e:
if e.errno == errno.ENOENT:
unlink(self.target.name)
else:
raise
else: # no output generated at all; that's ok
unlink(self.tmpname_sout)
unlink(self.target.name)
if vars.VERBOSE or vars.XTRACE or vars.DEBUG:
log('%s (done)\n\n', self.target.printable_name())
else:
unlink(self.tmpname_sout)
unlink(self.tmpname_arg3)
if rv != 0:
if vars.ONLY_LOG:
logger.print_log(self.target)
err('%s: exit code %d\n', self.target.printable_name(), rv)
self.target.build_done(exitcode=rv)
self.target.refresh()
self._move_extra_results(self.outdir, self.target.dirname() or ".", rv)
self.result[0] += rv
self.result[1] += 1
if self.parent:
self.parent.add_dep(self.target)
finally:
self.tmp_sout_f.close()
self.target.dolock().unlock()
def _move_extra_results(self, src, dest, rv):
assert src
assert dest
if os.path.isdir(src) and os.path.isdir(dest):
for f in os.listdir(src):
sp = os.path.join(src, f)
dp = os.path.join(dest, f)
self._move_extra_results(sp, dp, rv)
os.rmdir(src)
else:
sf = state.File(name=dest)
if sf == self.delegate:
dest = os.path.join(sf.tmpfilename("out"), sf.basename())
debug("rename %r %r\n", src, dest)
os.rename(src, dest)
sf.copy_deps_from(self.target)
else:
sf.dolock().trylock()
if sf.dolock().owned == state.LOCK_EX:
try:
sf.build_starting()
debug("rename %r %r\n", src, dest)
os.rename(src, dest)
sf.copy_deps_from(self.target)
sf.build_done(rv)
finally:
sf.dolock().unlock()
else:
warn("%s: discarding (parallel build)\n", dest)
unlink(src)
def schedule_job(self):
assert self.target.dolock().owned == state.LOCK_EX
rv = self.prepare()
if rv != None:
self.result[0] += rv
self.result[1] += 1
else:
jwack.start_job(self.target, self.build, self.done)
def build(f, any_errors, should_build, add_dep_to=None, delegate=None, re_do=True):
if f.dolock():
if f.check_deadlocks():
err("%s: recursive dependency, breaking deadlock\n", f.printable_name())
any_errors[0] += 1
any_errors[1] += 1
else:
jwack.get_token(f)
f.dolock().waitlock()
if any_errors[0] and not vars.KEEP_GOING:
return False
f.refresh()
debug3('think about building %r\n', f.name)
dirty = should_build(f)
while dirty and dirty != deps.DIRTY:
# FIXME: bring back the old (targetname) notation in the output
# when we need to do this. And add comments.
for t2 in dirty:
if not build(t2, any_errors, should_build, delegate, re_do):
return False
jwack.wait_all()
dirty = should_build(f)
if dirty:
job = BuildJob(f, any_errors, add_dep_to, delegate, re_do)
add_dep_to = None
job.schedule_job()
else:
f.dolock().unlock()
if add_dep_to:
f.refresh()
add_dep_to.add_dep(f)
return True
def main(targets, should_build = (lambda f: deps.DIRTY), parent=None, delegate=None, re_do=True):
any_errors = [0, 0]
if vars.SHUFFLE:
import random
random.shuffle(targets)
if delegate:
debug("delegated: %s\n", delegate)
try:
for t in targets:
f = state.File(name=t)
if not build(f, any_errors, should_build, add_dep_to=parent, delegate=delegate, re_do=re_do):
break
jwack.wait_all()
finally:
jwack.force_return_tokens()
if any_errors[1] == 1:
return any_errors[0]
elif any_errors[0]:
return 1
else:
return 0