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