| 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
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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 tagswitch, iteritems
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| 12 | from osh import split
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| 13 |
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| 14 | import libc
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| 15 | import posix_ as posix
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| 16 |
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| 17 | from typing import Dict, cast
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| 18 |
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| 19 | # This was derived from bash --norc -c 'argv "$COMP_WORDBREAKS".
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| 20 | # Python overwrites this to something Python-specific in Modules/readline.c, so
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| 21 | # we have to set it back!
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| 22 | # Used in both core/competion.py and osh/state.py
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| 23 | _READLINE_DELIMS = ' \t\n"\'><=;|&(:'
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| 24 |
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| 25 |
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| 26 | def GetWorkingDir():
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| 27 | # type: () -> str
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| 28 | """Fallback for pwd and $PWD when there's no 'cd' and no inherited $PWD."""
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| 29 | try:
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| 30 | return posix.getcwd()
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| 31 | except (IOError, OSError) as e:
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| 32 | e_die("Can't determine working directory: %s" % pyutil.strerror(e))
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| 33 |
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| 34 |
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| 35 | def InitDefaultVars(mem):
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| 36 | # type: (state.Mem) -> None
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| 37 |
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| 38 | # These 3 are special, can't be changed
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| 39 | state.SetGlobalString(mem, 'UID', str(posix.getuid()))
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| 40 | state.SetGlobalString(mem, 'EUID', str(posix.geteuid()))
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| 41 | state.SetGlobalString(mem, 'PPID', str(posix.getppid()))
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| 42 |
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| 43 | # For getopts builtin - meant to be read, not changed
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| 44 | state.SetGlobalString(mem, 'OPTIND', '1')
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| 45 |
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| 46 | # These can be changed. Could go AFTER environment, e.g. in
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| 47 | # InitVarsAfterEnv().
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| 48 |
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| 49 | # Default value; user may unset it.
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| 50 | # $ echo -n "$IFS" | python -c 'import sys;print repr(sys.stdin.read())'
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| 51 | # ' \t\n'
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| 52 | state.SetGlobalString(mem, 'IFS', split.DEFAULT_IFS)
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| 53 |
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| 54 | state.SetGlobalString(mem, 'HOSTNAME', libc.gethostname())
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| 55 |
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| 56 | # In bash, this looks like 'linux-gnu', 'linux-musl', etc. Scripts test
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| 57 | # for 'darwin' and 'freebsd' too. They generally don't like at 'gnu' or
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| 58 | # 'musl'. We don't have that info, so just make it 'linux'.
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| 59 | state.SetGlobalString(mem, 'OSTYPE', pyos.OsType())
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| 60 |
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| 61 | # When xtrace_rich is off, this is just like '+ ', the shell default
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| 62 | state.SetGlobalString(mem, 'PS4',
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| 63 | '${SHX_indent}${SHX_punct}${SHX_pid_str} ')
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| 64 |
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| 65 | # bash-completion uses this. Value copied from bash. It doesn't integrate
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| 66 | # with 'readline' yet.
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| 67 | state.SetGlobalString(mem, 'COMP_WORDBREAKS', _READLINE_DELIMS)
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| 68 |
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| 69 | # TODO on $HOME: bash sets it if it's a login shell and not in POSIX mode!
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| 70 | # if (login_shell == 1 && posixly_correct == 0)
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| 71 | # set_home_var ();
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| 72 |
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| 73 |
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| 74 | def CopyVarsFromEnv(exec_opts, environ, mem):
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| 75 | # type: (optview.Exec, Dict[str, str], state.Mem) -> None
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| 76 |
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| 77 | # POSIX shell behavior: env vars become exported global vars
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| 78 | if not exec_opts.no_exported():
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| 79 | # This is the way dash and bash work -- at startup, they turn everything in
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| 80 | # 'environ' variable into shell variables. Bash has an export_env
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| 81 | # variable. Dash has a loop through environ in init.c
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| 82 | for n, v in iteritems(environ):
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| 83 | mem.SetNamed(location.LName(n),
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| 84 | value.Str(v),
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| 85 | scope_e.GlobalOnly,
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| 86 | flags=state.SetExport)
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| 87 |
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| 88 | # YSH behavior: env vars go in ENV dict, not exported vars. Note that
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| 89 | # ysh:upgrade can have BOTH ENV and exported vars. It's OK if they're on
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| 90 | # at the same time.
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| 91 | if exec_opts.env_obj():
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| 92 | # This is for invoking bin/ysh
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| 93 | # If you run bin/osh, then exec_opts.env_obj() will be FALSE at this point.
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| 94 | # When you write shopt --set ysh:all or ysh:upgrade, then the shopt
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| 95 | # builtin will call MaybeInitEnvDict()
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| 96 | mem.MaybeInitEnvDict(environ)
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| 97 |
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| 98 |
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| 99 | def InitVarsAfterEnv(mem):
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| 100 | # type: (state.Mem) -> None
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| 101 |
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| 102 | # If PATH SHELLOPTS PWD are not in environ, then initialize them.
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| 103 | val = mem.GetValue('PATH')
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| 104 | if val.tag() == value_e.Undef:
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| 105 | # Setting PATH to these two dirs match what zsh and mksh do. bash and
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| 106 | # dash add {,/usr/,/usr/local}/{bin,sbin}
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| 107 | state.SetGlobalString(mem, 'PATH', '/bin:/usr/bin')
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| 108 |
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| 109 | val = mem.GetValue('SHELLOPTS')
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| 110 | if val.tag() == value_e.Undef:
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| 111 | # Divergence: bash constructs a string here too, it doesn't just read it
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| 112 | state.SetGlobalString(mem, 'SHELLOPTS', '')
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| 113 | # It's readonly, even if it's not set
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| 114 | mem.SetNamed(location.LName('SHELLOPTS'),
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| 115 | None,
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| 116 | scope_e.GlobalOnly,
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| 117 | flags=state.SetReadOnly)
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| 118 | # NOTE: bash also has BASHOPTS
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| 119 |
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| 120 | val = mem.GetValue('PWD')
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| 121 | if val.tag() == value_e.Undef:
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| 122 | state.SetGlobalString(mem, 'PWD', GetWorkingDir())
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| 123 | # It's EXPORTED, even if it's not set. bash and dash both do this:
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| 124 | # env -i -- dash -c env
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| 125 | mem.SetNamed(location.LName('PWD'),
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| 126 | None,
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| 127 | scope_e.GlobalOnly,
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| 128 | flags=state.SetExport)
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| 129 |
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| 130 | # Set a MUTABLE GLOBAL that's SEPARATE from $PWD. It's used by the 'pwd'
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| 131 | # builtin, and it can't be modified by users.
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| 132 | val = mem.GetValue('PWD')
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| 133 | assert val.tag() == value_e.Str, val
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| 134 | pwd = cast(value.Str, val).s
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| 135 | mem.SetPwd(pwd)
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| 136 |
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| 137 |
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| 138 | def InitBuiltins(mem, version_str):
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| 139 | # type: (state.Mem, str) -> None
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| 140 | """Initialize memory with shell defaults.
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| 141 |
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| 142 | Other interpreters could have different builtin variables.
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| 143 | """
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| 144 | # TODO: REMOVE this legacy. ble.sh checks it!
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| 145 | mem.builtins['OIL_VERSION'] = value.Str(version_str)
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| 146 |
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| 147 | mem.builtins['OILS_VERSION'] = value.Str(version_str)
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| 148 |
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| 149 | # The source builtin understands '///' to mean "relative to embedded stdlib"
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| 150 | mem.builtins['LIB_OSH'] = value.Str('///osh')
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| 151 | mem.builtins['LIB_YSH'] = value.Str('///ysh')
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| 152 |
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| 153 | # - C spells it NAN
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| 154 | # - JavaScript spells it NaN
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| 155 | # - Python 2 has float('nan'), while Python 3 has math.nan.
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| 156 | #
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| 157 | # - libc prints the strings 'nan' and 'inf'
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| 158 | # - Python 3 prints the strings 'nan' and 'inf'
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| 159 | # - JavaScript prints 'NaN' and 'Infinity', which is more stylized
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| 160 | mem.builtins['NAN'] = value.Float(pyutil.nan())
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| 161 | mem.builtins['INFINITY'] = value.Float(pyutil.infinity())
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| 162 |
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| 163 |
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| 164 | def InitInteractive(mem, lang):
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| 165 | # type: (state.Mem, str) -> None
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| 166 | """Initialization that's only done in the interactive/headless shell."""
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| 167 |
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| 168 | ps1_str = state.GetStringFromEnv(mem, 'PS1')
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| 169 | if ps1_str is None:
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| 170 | state.SetStringInEnv(mem, 'PS1', r'\s-\v\$ ')
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| 171 | else:
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| 172 | if lang == 'ysh':
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| 173 | state.SetStringInEnv(mem, 'PS1', 'ysh ' + ps1_str)
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| 174 |
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| 175 | # Old logic:
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| 176 | if 0:
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| 177 | # PS1 is set, and it's YSH, then prepend 'ysh' to it to eliminate confusion
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| 178 | ps1_val = mem.GetValue('PS1')
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| 179 | with tagswitch(ps1_val) as case:
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| 180 | if case(value_e.Undef):
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| 181 | # Same default PS1 as bash
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| 182 | state.SetGlobalString(mem, 'PS1', r'\s-\v\$ ')
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| 183 |
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| 184 | elif case(value_e.Str):
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| 185 | # Hack so we don't confuse osh and ysh, but we still respect the
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| 186 | # PS1.
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| 187 |
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| 188 | # The user can disable this with
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| 189 | #
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| 190 | # func renderPrompt() {
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| 191 | # return ("${PS1@P}")
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| 192 | # }
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| 193 | if lang == 'ysh':
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| 194 | user_setting = cast(value.Str, ps1_val).s
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| 195 | state.SetGlobalString(mem, 'PS1', 'ysh ' + user_setting)
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