def _Exec(self, argv):
# Either execute command with redirects, or apply redirects in this shell.
# NOTE: Redirects were processed earlier.
if argv:
environ = self.mem.GetExported()
process.ExecExternalProgram(argv, environ) # never returns
else:
return 0
def _RunSimpleCommand(self, argv, fork_external, span_id, funcs=True):
"""
Args:
fork_external: for subshell ( ls / ) or ( command ls / )
"""
# This happens when you write "$@" but have no arguments.
if not argv:
return 0 # status 0, or skip it?
arg0 = argv[0]
builtin_id = builtin.ResolveSpecial(arg0)
if builtin_id != builtin_e.NONE:
try:
status = self._RunBuiltin(builtin_id, argv, span_id)
except args.UsageError as e:
ui.usage('osh %r usage error: %s', arg0, e)
status = 2 # consistent error code for usage error
return status
# Builtins like 'true' can be redefined as functions.
if funcs:
func_node = self.funcs.get(arg0)
if func_node is not None:
# NOTE: Functions could call 'exit 42' directly, etc.
status = self._RunFunc(func_node, argv[1:])
return status
builtin_id = builtin.Resolve(arg0)
if builtin_id == builtin_e.COMMAND: # 'command ls' suppresses function lookup
n = len(argv)
if n == 1:
return 0 # 'command', like the 'if not argv' case above
# The 'command' builtin syntax is simple enough that this is 100%
# correct, not a heuristic.
elif n >= 2 and argv[1] != '-v':
return self._RunSimpleCommand(argv[1:], fork_external, span_id,
funcs=False)
if builtin_id != builtin_e.NONE:
try:
status = self._RunBuiltin(builtin_id, argv, span_id)
except args.UsageError as e:
ui.usage('osh %r usage error: %s', arg0, e)
status = 2 # consistent error code for usage error
return status
environ = self.mem.GetExported() # Include temporary variables
if fork_external:
thunk = process.ExternalThunk(argv, environ)
p = process.Process(thunk)
status = p.Run(self.waiter)
return status
# NOTE: Never returns!
process.ExecExternalProgram(argv, environ)
def _RunSimpleCommand(self, argv, fork_external):
# This happens when you write "$@" but have no arguments.
if not argv:
return 0 # status 0, or skip it?
arg0 = argv[0]
builtin_id = builtin.ResolveSpecial(arg0)
if builtin_id != builtin_e.NONE:
try:
status = self._RunBuiltin(builtin_id, argv)
except args.UsageError as e:
# TODO: Make this message more consistent?
util.usage(str(e))
status = 2 # consistent error code for usage error
return status
# Builtins like 'true' can be redefined as functions.
func_node = self.funcs.get(arg0)
if func_node is not None:
# NOTE: Functions could call 'exit 42' directly, etc.
status = self.RunFunc(func_node, argv)
return status
builtin_id = builtin.Resolve(arg0)
if builtin_id != builtin_e.NONE:
try:
status = self._RunBuiltin(builtin_id, argv)
except args.UsageError as e:
# TODO: Make this message more consistent?
util.usage(str(e))
status = 2 # consistent error code for usage error
return status
environ = self.mem.GetExported() # Include temporary variables
if fork_external:
thunk = process.ExternalThunk(argv, environ)
p = process.Process(thunk)
status = p.Run(self.waiter)
return status
# NOTE: Never returns!
process.ExecExternalProgram(argv, environ)