| 1 | #!/usr/bin/env python2
|
| 2 | """
|
| 3 | meta_osh.py - Builtins that call back into the interpreter.
|
| 4 | """
|
| 5 | from __future__ import print_function
|
| 6 |
|
| 7 | from _devbuild.gen import arg_types
|
| 8 | from _devbuild.gen.runtime_asdl import cmd_value, CommandStatus
|
| 9 | from _devbuild.gen.value_asdl import value, value_e
|
| 10 | from _devbuild.gen.syntax_asdl import source, loc
|
| 11 | from core import alloc
|
| 12 | from core import dev
|
| 13 | from core import error
|
| 14 | from core import executor
|
| 15 | from core import main_loop
|
| 16 | from core import process
|
| 17 | from core.error import e_usage
|
| 18 | from core import pyutil # strerror
|
| 19 | from core import state
|
| 20 | from core import vm
|
| 21 | from data_lang import j8_lite
|
| 22 | from frontend import flag_util
|
| 23 | from frontend import consts
|
| 24 | from frontend import reader
|
| 25 | from frontend import typed_args
|
| 26 | from mycpp.mylib import log, print_stderr
|
| 27 | from pylib import os_path
|
| 28 | from osh import cmd_eval
|
| 29 |
|
| 30 | import posix_ as posix
|
| 31 | from posix_ import X_OK # translated directly to C macro
|
| 32 |
|
| 33 | _ = log
|
| 34 |
|
| 35 | from typing import Dict, List, Tuple, Optional, cast, TYPE_CHECKING
|
| 36 | if TYPE_CHECKING:
|
| 37 | from frontend import args
|
| 38 | from frontend.parse_lib import ParseContext
|
| 39 | from core import optview
|
| 40 | from display import ui
|
| 41 | from osh.cmd_eval import CommandEvaluator
|
| 42 | from osh.cmd_parse import CommandParser
|
| 43 |
|
| 44 |
|
| 45 | class Eval(vm._Builtin):
|
| 46 |
|
| 47 | def __init__(
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| 48 | self,
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| 49 | parse_ctx, # type: ParseContext
|
| 50 | exec_opts, # type: optview.Exec
|
| 51 | cmd_ev, # type: CommandEvaluator
|
| 52 | tracer, # type: dev.Tracer
|
| 53 | errfmt, # type: ui.ErrorFormatter
|
| 54 | mem, # type: state.Mem
|
| 55 | ):
|
| 56 | # type: (...) -> None
|
| 57 | self.parse_ctx = parse_ctx
|
| 58 | self.arena = parse_ctx.arena
|
| 59 | self.exec_opts = exec_opts
|
| 60 | self.cmd_ev = cmd_ev
|
| 61 | self.tracer = tracer
|
| 62 | self.errfmt = errfmt
|
| 63 | self.mem = mem
|
| 64 |
|
| 65 | def Run(self, cmd_val):
|
| 66 | # type: (cmd_value.Argv) -> int
|
| 67 |
|
| 68 | if cmd_val.proc_args: # eval (mycmd)
|
| 69 | rd = typed_args.ReaderForProc(cmd_val)
|
| 70 | cmd = rd.PosCommand()
|
| 71 | dollar0 = rd.NamedStr("dollar0", None)
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| 72 |
|
| 73 | pos_args_raw = rd.NamedList("pos_args", None)
|
| 74 | if pos_args_raw is not None:
|
| 75 | pos_args = [] # type: List[str]
|
| 76 | for arg in pos_args_raw:
|
| 77 | if arg.tag() != value_e.Str:
|
| 78 | raise error.TypeErr(
|
| 79 | arg,
|
| 80 | "Expected pos_args to be a list of Str",
|
| 81 | rd.LeftParenToken())
|
| 82 |
|
| 83 | pos_args.append(cast(value.Str, arg).s)
|
| 84 | else:
|
| 85 | pos_args = None
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| 86 |
|
| 87 | vars = rd.NamedDict("vars", None)
|
| 88 |
|
| 89 | rd.Done()
|
| 90 | with state.ctx_Eval(self.mem, dollar0, pos_args, vars):
|
| 91 | return self.cmd_ev.EvalCommand(cmd)
|
| 92 |
|
| 93 | # There are no flags, but we need it to respect --
|
| 94 | _, arg_r = flag_util.ParseCmdVal('eval', cmd_val)
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| 95 |
|
| 96 | if self.exec_opts.simple_eval_builtin():
|
| 97 | code_str, eval_loc = arg_r.ReadRequired2('requires code string')
|
| 98 | if not arg_r.AtEnd():
|
| 99 | e_usage('requires exactly 1 argument', loc.Missing)
|
| 100 | else:
|
| 101 | code_str = ' '.join(arg_r.Rest())
|
| 102 | # code_str could be EMPTY, so just use the first one
|
| 103 | eval_loc = cmd_val.arg_locs[0]
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| 104 |
|
| 105 | line_reader = reader.StringLineReader(code_str, self.arena)
|
| 106 | c_parser = self.parse_ctx.MakeOshParser(line_reader)
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| 107 |
|
| 108 | src = source.ArgvWord('eval', eval_loc)
|
| 109 | with dev.ctx_Tracer(self.tracer, 'eval', None):
|
| 110 | with alloc.ctx_SourceCode(self.arena, src):
|
| 111 | return main_loop.Batch(self.cmd_ev,
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| 112 | c_parser,
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| 113 | self.errfmt,
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| 114 | cmd_flags=cmd_eval.RaiseControlFlow)
|
| 115 |
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| 116 |
|
| 117 | class Source(vm._Builtin):
|
| 118 |
|
| 119 | def __init__(
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| 120 | self,
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| 121 | parse_ctx, # type: ParseContext
|
| 122 | search_path, # type: state.SearchPath
|
| 123 | cmd_ev, # type: CommandEvaluator
|
| 124 | fd_state, # type: process.FdState
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| 125 | tracer, # type: dev.Tracer
|
| 126 | errfmt, # type: ui.ErrorFormatter
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| 127 | loader, # type: pyutil._ResourceLoader
|
| 128 | ):
|
| 129 | # type: (...) -> None
|
| 130 | self.parse_ctx = parse_ctx
|
| 131 | self.arena = parse_ctx.arena
|
| 132 | self.search_path = search_path
|
| 133 | self.cmd_ev = cmd_ev
|
| 134 | self.fd_state = fd_state
|
| 135 | self.tracer = tracer
|
| 136 | self.errfmt = errfmt
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| 137 | self.loader = loader
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| 138 |
|
| 139 | self.mem = cmd_ev.mem
|
| 140 |
|
| 141 | def Run(self, cmd_val):
|
| 142 | # type: (cmd_value.Argv) -> int
|
| 143 | attrs, arg_r = flag_util.ParseCmdVal('source', cmd_val)
|
| 144 | arg = arg_types.source(attrs.attrs)
|
| 145 |
|
| 146 | path_arg = arg_r.Peek()
|
| 147 | if path_arg is None:
|
| 148 | e_usage('missing required argument', loc.Missing)
|
| 149 | arg_r.Next()
|
| 150 |
|
| 151 | # Old:
|
| 152 | # source --builtin two.sh # looks up stdlib/two.sh
|
| 153 | # New:
|
| 154 | # source $LIB_OSH/two.sh # looks up stdlib/osh/two.sh
|
| 155 | # source ///osh/two.sh # looks up stdlib/osh/two.sh
|
| 156 | builtin_path = None # type: Optional[str]
|
| 157 | if arg.builtin:
|
| 158 | builtin_path = path_arg
|
| 159 | elif path_arg.startswith('///'):
|
| 160 | builtin_path = path_arg[3:]
|
| 161 |
|
| 162 | if builtin_path is not None:
|
| 163 | try:
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| 164 | load_path = os_path.join("stdlib", builtin_path)
|
| 165 | contents = self.loader.Get(load_path)
|
| 166 | except (IOError, OSError):
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| 167 | self.errfmt.Print_('source failed: No builtin file %r' %
|
| 168 | load_path,
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| 169 | blame_loc=cmd_val.arg_locs[2])
|
| 170 | return 2
|
| 171 |
|
| 172 | line_reader = reader.StringLineReader(contents, self.arena)
|
| 173 | c_parser = self.parse_ctx.MakeOshParser(line_reader)
|
| 174 | return self._Exec(cmd_val, arg_r, load_path, c_parser)
|
| 175 |
|
| 176 | else:
|
| 177 | # 'source' respects $PATH
|
| 178 | resolved = self.search_path.LookupOne(path_arg,
|
| 179 | exec_required=False)
|
| 180 | if resolved is None:
|
| 181 | resolved = path_arg
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| 182 |
|
| 183 | try:
|
| 184 | # Shell can't use descriptors 3-9
|
| 185 | f = self.fd_state.Open(resolved)
|
| 186 | except (IOError, OSError) as e:
|
| 187 | self.errfmt.Print_('source %r failed: %s' %
|
| 188 | (path_arg, pyutil.strerror(e)),
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| 189 | blame_loc=cmd_val.arg_locs[1])
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| 190 | return 1
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| 191 |
|
| 192 | line_reader = reader.FileLineReader(f, self.arena)
|
| 193 | c_parser = self.parse_ctx.MakeOshParser(line_reader)
|
| 194 |
|
| 195 | with process.ctx_FileCloser(f):
|
| 196 | return self._Exec(cmd_val, arg_r, path_arg, c_parser)
|
| 197 |
|
| 198 | def _Exec(self, cmd_val, arg_r, path, c_parser):
|
| 199 | # type: (cmd_value.Argv, args.Reader, str, CommandParser) -> int
|
| 200 | call_loc = cmd_val.arg_locs[0]
|
| 201 |
|
| 202 | # A sourced module CAN have a new arguments array, but it always shares
|
| 203 | # the same variable scope as the caller. The caller could be at either a
|
| 204 | # global or a local scope.
|
| 205 |
|
| 206 | # TODO: I wonder if we compose the enter/exit methods more easily.
|
| 207 |
|
| 208 | with dev.ctx_Tracer(self.tracer, 'source', cmd_val.argv):
|
| 209 | source_argv = arg_r.Rest()
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| 210 | with state.ctx_Source(self.mem, path, source_argv):
|
| 211 | with state.ctx_ThisDir(self.mem, path):
|
| 212 | src = source.SourcedFile(path, call_loc)
|
| 213 | with alloc.ctx_SourceCode(self.arena, src):
|
| 214 | try:
|
| 215 | status = main_loop.Batch(
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| 216 | self.cmd_ev,
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| 217 | c_parser,
|
| 218 | self.errfmt,
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| 219 | cmd_flags=cmd_eval.RaiseControlFlow)
|
| 220 | except vm.IntControlFlow as e:
|
| 221 | if e.IsReturn():
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| 222 | status = e.StatusCode()
|
| 223 | else:
|
| 224 | raise
|
| 225 |
|
| 226 | return status
|
| 227 |
|
| 228 |
|
| 229 | def _PrintFreeForm(row):
|
| 230 | # type: (Tuple[str, str, Optional[str]]) -> None
|
| 231 | name, kind, resolved = row
|
| 232 |
|
| 233 | if kind == 'file':
|
| 234 | what = resolved
|
| 235 | elif kind == 'alias':
|
| 236 | what = ('an alias for %s' %
|
| 237 | j8_lite.EncodeString(resolved, unquoted_ok=True))
|
| 238 | else: # builtin, function, keyword
|
| 239 | what = 'a shell %s' % kind
|
| 240 |
|
| 241 | # TODO: Should also print haynode
|
| 242 |
|
| 243 | print('%s is %s' % (name, what))
|
| 244 |
|
| 245 | # if kind == 'function':
|
| 246 | # bash is the only shell that prints the function
|
| 247 |
|
| 248 |
|
| 249 | def _PrintEntry(arg, row):
|
| 250 | # type: (arg_types.type, Tuple[str, str, Optional[str]]) -> None
|
| 251 |
|
| 252 | _, kind, resolved = row
|
| 253 | assert kind is not None
|
| 254 |
|
| 255 | if arg.t: # short string
|
| 256 | print(kind)
|
| 257 |
|
| 258 | elif arg.p:
|
| 259 | #log('%s %s %s', name, kind, resolved)
|
| 260 | if kind == 'file':
|
| 261 | print(resolved)
|
| 262 |
|
| 263 | else: # free-form text
|
| 264 | _PrintFreeForm(row)
|
| 265 |
|
| 266 |
|
| 267 | class Command(vm._Builtin):
|
| 268 | """'command ls' suppresses function lookup."""
|
| 269 |
|
| 270 | def __init__(
|
| 271 | self,
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| 272 | shell_ex, # type: vm._Executor
|
| 273 | funcs, # type: state.Procs
|
| 274 | aliases, # type: Dict[str, str]
|
| 275 | search_path, # type: state.SearchPath
|
| 276 | ):
|
| 277 | # type: (...) -> None
|
| 278 | self.shell_ex = shell_ex
|
| 279 | self.funcs = funcs
|
| 280 | self.aliases = aliases
|
| 281 | self.search_path = search_path
|
| 282 |
|
| 283 | def Run(self, cmd_val):
|
| 284 | # type: (cmd_value.Argv) -> int
|
| 285 |
|
| 286 | # accept_typed_args=True because we invoke other builtins
|
| 287 | attrs, arg_r = flag_util.ParseCmdVal('command',
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| 288 | cmd_val,
|
| 289 | accept_typed_args=True)
|
| 290 | arg = arg_types.command(attrs.attrs)
|
| 291 |
|
| 292 | argv, locs = arg_r.Rest2()
|
| 293 |
|
| 294 | if arg.v or arg.V:
|
| 295 | status = 0
|
| 296 | for argument in argv:
|
| 297 | r = _ResolveName(argument, self.funcs, self.aliases,
|
| 298 | self.search_path, False)
|
| 299 | if len(r):
|
| 300 | # command -v prints the name (-V is more detailed)
|
| 301 | # Print it only once.
|
| 302 | row = r[0]
|
| 303 | name, _, _ = row
|
| 304 | if arg.v:
|
| 305 | print(name)
|
| 306 | else:
|
| 307 | _PrintFreeForm(row)
|
| 308 | else:
|
| 309 | # match bash behavior by printing to stderr
|
| 310 | print_stderr('%s: not found' % argument)
|
| 311 | status = 1 # nothing printed, but we fail
|
| 312 |
|
| 313 | return status
|
| 314 |
|
| 315 | cmd_val2 = cmd_value.Argv(argv, locs, cmd_val.is_last_cmd,
|
| 316 | cmd_val.proc_args)
|
| 317 |
|
| 318 | cmd_st = CommandStatus.CreateNull(alloc_lists=True)
|
| 319 |
|
| 320 | # If we respected do_fork here instead of passing DO_FORK
|
| 321 | # unconditionally, the case 'command date | wc -l' would take 2
|
| 322 | # processes instead of 3. See test/syscall
|
| 323 | run_flags = executor.NO_CALL_PROCS
|
| 324 | if cmd_val.is_last_cmd:
|
| 325 | run_flags |= executor.IS_LAST_CMD
|
| 326 | if arg.p:
|
| 327 | run_flags |= executor.USE_DEFAULT_PATH
|
| 328 |
|
| 329 | return self.shell_ex.RunSimpleCommand(cmd_val2, cmd_st, run_flags)
|
| 330 |
|
| 331 |
|
| 332 | def _ShiftArgv(cmd_val):
|
| 333 | # type: (cmd_value.Argv) -> cmd_value.Argv
|
| 334 | return cmd_value.Argv(cmd_val.argv[1:], cmd_val.arg_locs[1:],
|
| 335 | cmd_val.is_last_cmd, cmd_val.proc_args)
|
| 336 |
|
| 337 |
|
| 338 | class Builtin(vm._Builtin):
|
| 339 |
|
| 340 | def __init__(self, shell_ex, errfmt):
|
| 341 | # type: (vm._Executor, ui.ErrorFormatter) -> None
|
| 342 | self.shell_ex = shell_ex
|
| 343 | self.errfmt = errfmt
|
| 344 |
|
| 345 | def Run(self, cmd_val):
|
| 346 | # type: (cmd_value.Argv) -> int
|
| 347 |
|
| 348 | if len(cmd_val.argv) == 1:
|
| 349 | return 0 # this could be an error in strict mode?
|
| 350 |
|
| 351 | name = cmd_val.argv[1]
|
| 352 |
|
| 353 | # Run regular builtin or special builtin
|
| 354 | to_run = consts.LookupNormalBuiltin(name)
|
| 355 | if to_run == consts.NO_INDEX:
|
| 356 | to_run = consts.LookupSpecialBuiltin(name)
|
| 357 | if to_run == consts.NO_INDEX:
|
| 358 | location = cmd_val.arg_locs[1]
|
| 359 | if consts.LookupAssignBuiltin(name) != consts.NO_INDEX:
|
| 360 | # NOTE: There's a similar restriction for 'command'
|
| 361 | self.errfmt.Print_("Can't run assignment builtin recursively",
|
| 362 | blame_loc=location)
|
| 363 | else:
|
| 364 | self.errfmt.Print_("%r isn't a shell builtin" % name,
|
| 365 | blame_loc=location)
|
| 366 | return 1
|
| 367 |
|
| 368 | cmd_val2 = _ShiftArgv(cmd_val)
|
| 369 | return self.shell_ex.RunBuiltin(to_run, cmd_val2)
|
| 370 |
|
| 371 |
|
| 372 | class RunProc(vm._Builtin):
|
| 373 |
|
| 374 | def __init__(self, shell_ex, procs, errfmt):
|
| 375 | # type: (vm._Executor, state.Procs, ui.ErrorFormatter) -> None
|
| 376 | self.shell_ex = shell_ex
|
| 377 | self.procs = procs
|
| 378 | self.errfmt = errfmt
|
| 379 |
|
| 380 | def Run(self, cmd_val):
|
| 381 | # type: (cmd_value.Argv) -> int
|
| 382 | _, arg_r = flag_util.ParseCmdVal('runproc',
|
| 383 | cmd_val,
|
| 384 | accept_typed_args=True)
|
| 385 | argv, locs = arg_r.Rest2()
|
| 386 |
|
| 387 | if len(argv) == 0:
|
| 388 | raise error.Usage('requires arguments', loc.Missing)
|
| 389 |
|
| 390 | name = argv[0]
|
| 391 | if not self.procs.Get(name):
|
| 392 | self.errfmt.PrintMessage('runproc: no proc named %r' % name)
|
| 393 | return 1
|
| 394 |
|
| 395 | cmd_val2 = cmd_value.Argv(argv, locs, cmd_val.is_last_cmd,
|
| 396 | cmd_val.proc_args)
|
| 397 |
|
| 398 | cmd_st = CommandStatus.CreateNull(alloc_lists=True)
|
| 399 | run_flags = executor.IS_LAST_CMD if cmd_val.is_last_cmd else 0
|
| 400 | return self.shell_ex.RunSimpleCommand(cmd_val2, cmd_st, run_flags)
|
| 401 |
|
| 402 |
|
| 403 | def _ResolveName(
|
| 404 | name, # type: str
|
| 405 | funcs, # type: state.Procs
|
| 406 | aliases, # type: Dict[str, str]
|
| 407 | search_path, # type: state.SearchPath
|
| 408 | do_all, # type: bool
|
| 409 | ):
|
| 410 | # type: (...) -> List[Tuple[str, str, Optional[str]]]
|
| 411 |
|
| 412 | # MyPy tuple type
|
| 413 | no_str = None # type: Optional[str]
|
| 414 |
|
| 415 | results = [] # type: List[Tuple[str, str, Optional[str]]]
|
| 416 |
|
| 417 | if funcs and funcs.Get(name):
|
| 418 | results.append((name, 'function', no_str))
|
| 419 |
|
| 420 | if name in aliases:
|
| 421 | results.append((name, 'alias', aliases[name]))
|
| 422 |
|
| 423 | # See if it's a builtin
|
| 424 | if consts.LookupNormalBuiltin(name) != 0:
|
| 425 | results.append((name, 'builtin', no_str))
|
| 426 | elif consts.LookupSpecialBuiltin(name) != 0:
|
| 427 | results.append((name, 'builtin', no_str))
|
| 428 | elif consts.LookupAssignBuiltin(name) != 0:
|
| 429 | results.append((name, 'builtin', no_str))
|
| 430 |
|
| 431 | # See if it's a keyword
|
| 432 | if consts.IsControlFlow(name): # continue, etc.
|
| 433 | results.append((name, 'keyword', no_str))
|
| 434 | elif consts.IsKeyword(name):
|
| 435 | results.append((name, 'keyword', no_str))
|
| 436 |
|
| 437 | # See if it's external
|
| 438 | for path in search_path.LookupReflect(name, do_all):
|
| 439 | if posix.access(path, X_OK):
|
| 440 | results.append((name, 'file', path))
|
| 441 |
|
| 442 | return results
|
| 443 |
|
| 444 |
|
| 445 | class Type(vm._Builtin):
|
| 446 |
|
| 447 | def __init__(
|
| 448 | self,
|
| 449 | funcs, # type: state.Procs
|
| 450 | aliases, # type: Dict[str, str]
|
| 451 | search_path, # type: state.SearchPath
|
| 452 | errfmt, # type: ui.ErrorFormatter
|
| 453 | ):
|
| 454 | # type: (...) -> None
|
| 455 | self.funcs = funcs
|
| 456 | self.aliases = aliases
|
| 457 | self.search_path = search_path
|
| 458 | self.errfmt = errfmt
|
| 459 |
|
| 460 | def Run(self, cmd_val):
|
| 461 | # type: (cmd_value.Argv) -> int
|
| 462 | attrs, arg_r = flag_util.ParseCmdVal('type', cmd_val)
|
| 463 | arg = arg_types.type(attrs.attrs)
|
| 464 |
|
| 465 | if arg.f: # suppress function lookup
|
| 466 | funcs = None # type: state.Procs
|
| 467 | else:
|
| 468 | funcs = self.funcs
|
| 469 |
|
| 470 | status = 0
|
| 471 | names = arg_r.Rest()
|
| 472 |
|
| 473 | if arg.P: # -P should forces PATH search, regardless of builtin/alias/function/etc.
|
| 474 | for name in names:
|
| 475 | paths = self.search_path.LookupReflect(name, arg.a)
|
| 476 | if len(paths):
|
| 477 | for path in paths:
|
| 478 | print(path)
|
| 479 | else:
|
| 480 | status = 1
|
| 481 | return status
|
| 482 |
|
| 483 | for argument in names:
|
| 484 | r = _ResolveName(argument, funcs, self.aliases, self.search_path,
|
| 485 | arg.a)
|
| 486 | if arg.a:
|
| 487 | for row in r:
|
| 488 | _PrintEntry(arg, row)
|
| 489 | else:
|
| 490 | if len(r): # Just print the first one
|
| 491 | _PrintEntry(arg, r[0])
|
| 492 |
|
| 493 | # Error case
|
| 494 | if len(r) == 0:
|
| 495 | if not arg.t: # 'type -t' is silent in this case
|
| 496 | # match bash behavior by printing to stderr
|
| 497 | print_stderr('%s: not found' % argument)
|
| 498 | status = 1 # nothing printed, but we fail
|
| 499 |
|
| 500 | return status
|