| 1 | from __future__ import print_function
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| 2 |
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| 3 | from _devbuild.gen.runtime_asdl import scope_e
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| 4 | from _devbuild.gen.value_asdl import value, value_e, value_t
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| 5 | from core.error import e_die
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| 6 | from core import pyos
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| 7 | from core import pyutil
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| 8 | from core import optview
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| 9 | from core import state
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| 10 | from frontend import location
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| 11 | from mycpp.mylib import iteritems, log
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| 12 | from osh import split
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| 13 | from pylib import os_path
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| 14 |
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| 15 | import libc
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| 16 | import posix_ as posix
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| 17 |
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| 18 | from typing import Dict, Optional, cast, TYPE_CHECKING
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| 19 | if TYPE_CHECKING:
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| 20 | from _devbuild.gen import arg_types
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| 21 |
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| 22 | _ = log
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| 23 |
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| 24 |
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| 25 | class EnvConfig(object):
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| 26 | """Define a string config var read from the environment.
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| 27 |
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| 28 | And it's default.
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| 29 |
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| 30 | In OSH, it will appear as $PS1 or $PATH or $PWD. You can't see the
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| 31 | default.
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| 32 |
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| 33 | In YSH, it will appear as ENV.PS1 and __default__.PS1. I guess __default__
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| 34 | can be a Dict or Obj.
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| 35 |
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| 36 | Usage:
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| 37 |
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| 38 | env_config.Define('PS1', r'\\s-\\v')
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| 39 |
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| 40 | # YSH: set ENV.PS1
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| 41 | # OSH: set PS1
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| 42 | env_config.InitFromEnv('PS1')
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| 43 |
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| 44 | # YSH - get from ENV or __default__
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| 45 | env_config.Get('PS1')
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| 46 |
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| 47 | # Custom logic for PWD
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| 48 | if not env_config.Exists('PWD'):
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| 49 | pass
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| 50 |
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| 51 | More features:
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| 52 |
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| 53 | - On-demand BASHPID
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| 54 | - io.thisPid() - is BASHPID
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| 55 | - io.pid() - is $$
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| 56 | - Init-once UID EUID PPID
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| 57 | - maybe this should be a separate Funcs class?
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| 58 | - io.uid() io.euid() io.ppid()
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| 59 | """
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| 60 |
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| 61 | def __init__(self, mem, defaults):
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| 62 | # type: (state.Mem, Dict[str, value_t]) -> None
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| 63 |
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| 64 | # mutates env_dict
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| 65 | self.mem = mem
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| 66 | self.exec_opts = mem.exec_opts
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| 67 | self.defaults = defaults
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| 68 |
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| 69 | def Define(self, var_name, default_s):
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| 70 | # type: (str, str) -> None
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| 71 | """
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| 72 | """
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| 73 |
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| 74 | def GetVal(self, var_name):
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| 75 | # type: (str) -> value_t
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| 76 | """
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| 77 | YSH: Look at ENV.PATH, and then __defaults__.PATH
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| 78 | OSH: Look at $PATH
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| 79 | """
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| 80 | if self.mem.exec_opts.env_obj(): # e.g. $[ENV.PATH]
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| 81 |
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| 82 | val = self.mem.env_dict.get(var_name)
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| 83 | if val is None:
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| 84 | val = self.defaults.get(var_name)
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| 85 |
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| 86 | if val is None:
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| 87 | return value.Undef
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| 88 |
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| 89 | #log('**ENV obj val = %s', val)
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| 90 |
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| 91 | else: # e.g. $PATH
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| 92 | val = self.mem.GetValue(var_name)
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| 93 |
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| 94 | return val
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| 95 |
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| 96 | def Get(self, var_name):
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| 97 | # type: (str) -> Optional[str]
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| 98 | """
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| 99 | Like GetVal(), but returns a strin, or None
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| 100 | """
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| 101 | val = self.GetVal(var_name)
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| 102 | if val.tag() != value_e.Str:
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| 103 | return None
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| 104 | return cast(value.Str, val).s
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| 105 |
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| 106 | def SetDefault(self, var_name, s):
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| 107 | # type: (str, str) -> None
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| 108 | """
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| 109 | OSH: Set HISTFILE var, which is read by GetVal()
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| 110 | YSH: Set __defaults__.YSH_HISTFILE, which is also read by GetVal()
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| 111 | """
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| 112 | if self.mem.exec_opts.env_obj(): # e.g. $[ENV.PATH]
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| 113 | self.mem.defaults[var_name] = value.Str(s)
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| 114 | else:
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| 115 | state.SetGlobalString(self.mem, var_name, s)
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| 116 |
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| 117 |
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| 118 | class ShellFiles(object):
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| 119 |
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| 120 | def __init__(self, lang, home_dir, mem, flag):
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| 121 | # type: (str, str, state.Mem, arg_types.main) -> None
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| 122 | assert lang in ('osh', 'ysh'), lang
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| 123 | self.lang = lang
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| 124 | self.home_dir = home_dir
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| 125 | self.mem = mem
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| 126 | self.flag = flag
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| 127 |
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| 128 | self.init_done = False
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| 129 |
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| 130 | def HistVar(self):
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| 131 | # type: () -> str
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| 132 | return 'HISTFILE' if self.lang == 'osh' else 'YSH_HISTFILE'
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| 133 |
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| 134 | def DefaultHistoryFile(self):
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| 135 | # type: () -> str
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| 136 | return os_path.join(self.home_dir,
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| 137 | '.local/share/oils/%s_history' % self.lang)
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| 138 |
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| 139 | def HistoryFile(self):
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| 140 | # type: () -> Optional[str]
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| 141 | assert self.init_done
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| 142 |
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| 143 | return self.mem.env_config.Get(self.HistVar())
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| 144 |
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| 145 |
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| 146 | def GetWorkingDir():
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| 147 | # type: () -> str
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| 148 | """Fallback for pwd and $PWD when there's no 'cd' and no inherited $PWD."""
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| 149 | try:
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| 150 | return posix.getcwd()
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| 151 | except (IOError, OSError) as e:
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| 152 | e_die("Can't determine working directory: %s" % pyutil.strerror(e))
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| 153 |
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| 154 |
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| 155 | # This was derived from bash --norc -c 'argv "$COMP_WORDBREAKS".
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| 156 | # Python overwrites this to something Python-specific in Modules/readline.c, so
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| 157 | # we have to set it back!
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| 158 | # Used in both core/competion.py and osh/state.py
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| 159 | _READLINE_DELIMS = ' \t\n"\'><=;|&(:'
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| 160 |
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| 161 |
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| 162 | def InitDefaultVars(mem):
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| 163 | # type: (state.Mem) -> None
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| 164 |
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| 165 | # These 3 are special, can't be changed
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| 166 | state.SetGlobalString(mem, 'UID', str(posix.getuid()))
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| 167 | state.SetGlobalString(mem, 'EUID', str(posix.geteuid()))
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| 168 | state.SetGlobalString(mem, 'PPID', str(posix.getppid()))
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| 169 |
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| 170 | # For getopts builtin - meant to be read, not changed
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| 171 | state.SetGlobalString(mem, 'OPTIND', '1')
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| 172 |
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| 173 | # These can be changed. Could go AFTER environment, e.g. in
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| 174 | # InitVarsAfterEnv().
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| 175 |
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| 176 | # Default value; user may unset it.
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| 177 | # $ echo -n "$IFS" | python -c 'import sys;print repr(sys.stdin.read())'
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| 178 | # ' \t\n'
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| 179 | state.SetGlobalString(mem, 'IFS', split.DEFAULT_IFS)
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| 180 |
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| 181 | state.SetGlobalString(mem, 'HOSTNAME', libc.gethostname())
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| 182 |
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| 183 | # In bash, this looks like 'linux-gnu', 'linux-musl', etc. Scripts test
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| 184 | # for 'darwin' and 'freebsd' too. They generally don't like at 'gnu' or
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| 185 | # 'musl'. We don't have that info, so just make it 'linux'.
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| 186 | state.SetGlobalString(mem, 'OSTYPE', pyos.OsType())
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| 187 |
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| 188 | # When xtrace_rich is off, this is just like '+ ', the shell default
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| 189 | state.SetGlobalString(mem, 'PS4',
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| 190 | '${SHX_indent}${SHX_punct}${SHX_pid_str} ')
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| 191 |
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| 192 | # bash-completion uses this. Value copied from bash. It doesn't integrate
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| 193 | # with 'readline' yet.
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| 194 | state.SetGlobalString(mem, 'COMP_WORDBREAKS', _READLINE_DELIMS)
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| 195 |
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| 196 | # TODO on $HOME: bash sets it if it's a login shell and not in POSIX mode!
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| 197 | # if (login_shell == 1 && posixly_correct == 0)
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| 198 | # set_home_var ();
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| 199 |
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| 200 |
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| 201 | def CopyVarsFromEnv(exec_opts, environ, mem):
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| 202 | # type: (optview.Exec, Dict[str, str], state.Mem) -> None
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| 203 |
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| 204 | # POSIX shell behavior: env vars become exported global vars
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| 205 | if not exec_opts.no_exported():
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| 206 | # This is the way dash and bash work -- at startup, they turn everything in
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| 207 | # 'environ' variable into shell variables. Bash has an export_env
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| 208 | # variable. Dash has a loop through environ in init.c
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| 209 | for n, v in iteritems(environ):
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| 210 | mem.SetNamed(location.LName(n),
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| 211 | value.Str(v),
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| 212 | scope_e.GlobalOnly,
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| 213 | flags=state.SetExport)
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| 214 |
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| 215 | # YSH behavior: env vars go in ENV dict, not exported vars. Note that
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| 216 | # ysh:upgrade can have BOTH ENV and exported vars. It's OK if they're on
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| 217 | # at the same time.
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| 218 | if exec_opts.env_obj():
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| 219 | # This is for invoking bin/ysh
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| 220 | # If you run bin/osh, then exec_opts.env_obj() will be FALSE at this point.
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| 221 | # When you write shopt --set ysh:all or ysh:upgrade, then the shopt
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| 222 | # builtin will call MaybeInitEnvDict()
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| 223 | mem.MaybeInitEnvDict(environ)
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| 224 |
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| 225 |
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| 226 | def InitVarsAfterEnv(mem):
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| 227 | # type: (state.Mem) -> None
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| 228 |
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| 229 | # If PATH SHELLOPTS PWD are not in environ, then initialize them.
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| 230 | s = mem.env_config.Get('PATH')
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| 231 | if s is None:
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| 232 | # Setting PATH to these two dirs match what zsh and mksh do. bash and
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| 233 | # dash add {,/usr/,/usr/local}/{bin,sbin}
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| 234 | mem.env_config.SetDefault('PATH', '/bin:/usr/bin')
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| 235 |
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| 236 | val = mem.GetValue('SHELLOPTS')
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| 237 | if val.tag() == value_e.Undef:
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| 238 | # Divergence: bash constructs a string here too, it doesn't just read it
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| 239 | state.SetGlobalString(mem, 'SHELLOPTS', '')
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| 240 | # It's readonly, even if it's not set
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| 241 | mem.SetNamed(location.LName('SHELLOPTS'),
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| 242 | None,
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| 243 | scope_e.GlobalOnly,
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| 244 | flags=state.SetReadOnly)
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| 245 | # NOTE: bash also has BASHOPTS
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| 246 |
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| 247 | val = mem.GetValue('PWD')
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| 248 | if val.tag() == value_e.Undef:
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| 249 | state.SetGlobalString(mem, 'PWD', GetWorkingDir())
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| 250 | # It's EXPORTED, even if it's not set. bash and dash both do this:
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| 251 | # env -i -- dash -c env
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| 252 | mem.SetNamed(location.LName('PWD'),
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| 253 | None,
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| 254 | scope_e.GlobalOnly,
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| 255 | flags=state.SetExport)
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| 256 |
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| 257 | # Set a MUTABLE GLOBAL that's SEPARATE from $PWD. It's used by the 'pwd'
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| 258 | # builtin, and it can't be modified by users.
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| 259 | val = mem.GetValue('PWD')
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| 260 | assert val.tag() == value_e.Str, val
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| 261 | pwd = cast(value.Str, val).s
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| 262 | mem.SetPwd(pwd)
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| 263 |
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| 264 |
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| 265 | def InitInteractive(mem, sh_files, lang):
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| 266 | # type: (state.Mem, ShellFiles, str) -> None
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| 267 | """Initialization that's only done in the interactive/headless shell."""
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| 268 |
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| 269 | ps1_str = mem.env_config.Get('PS1')
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| 270 | if ps1_str is None:
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| 271 | mem.env_config.SetDefault('PS1', r'\s-\v\$ ')
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| 272 | else:
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| 273 | if lang == 'ysh':
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| 274 | # If this is bin/ysh, and we got a plain PS1, then prepend 'ysh ' to PS1
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| 275 | mem.env_dict['PS1'] = value.Str('ysh ' + ps1_str)
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| 276 |
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| 277 | hist_var = sh_files.HistVar()
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| 278 | hist_str = mem.env_config.Get(hist_var)
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| 279 | if hist_str is None:
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| 280 | mem.env_config.SetDefault(hist_var, sh_files.DefaultHistoryFile())
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| 281 |
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| 282 | sh_files.init_done = True # sanity check before using sh_files
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| 283 |
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| 284 |
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| 285 | def InitBuiltins(mem, version_str, defaults):
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| 286 | # type: (state.Mem, str, Dict[str, value_t]) -> None
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| 287 | """Initialize memory with shell defaults.
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| 288 |
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| 289 | Other interpreters could have different builtin variables.
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| 290 | """
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| 291 | # TODO: REMOVE this legacy. ble.sh checks it!
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| 292 | mem.builtins['OIL_VERSION'] = value.Str(version_str)
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| 293 |
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| 294 | mem.builtins['OILS_VERSION'] = value.Str(version_str)
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| 295 |
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| 296 | mem.builtins['__defaults__'] = value.Dict(defaults)
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| 297 |
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| 298 | # The source builtin understands '///' to mean "relative to embedded stdlib"
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| 299 | mem.builtins['LIB_OSH'] = value.Str('///osh')
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| 300 | mem.builtins['LIB_YSH'] = value.Str('///ysh')
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| 301 |
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| 302 | # - C spells it NAN
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| 303 | # - JavaScript spells it NaN
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| 304 | # - Python 2 has float('nan'), while Python 3 has math.nan.
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| 305 | #
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| 306 | # - libc prints the strings 'nan' and 'inf'
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| 307 | # - Python 3 prints the strings 'nan' and 'inf'
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| 308 | # - JavaScript prints 'NaN' and 'Infinity', which is more stylized
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| 309 | mem.builtins['NAN'] = value.Float(pyutil.nan())
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| 310 | mem.builtins['INFINITY'] = value.Float(pyutil.infinity())
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