| 1 | ## oils_failures_allowed: 3
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| 2 | ## compare_shells: bash dash mksh zsh ash
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| 3 |
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| 4 | # POSIX rule about special builtins pointed at:
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| 5 | #
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| 6 | # https://www.reddit.com/r/oilshell/comments/5ykpi3/oildev_is_alive/
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| 7 |
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| 8 | #### Prefix assignments persist after special builtins, like : (set -o posix)
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| 9 | case $SH in
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| 10 | bash)
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| 11 | set -o posix
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| 12 | ;;
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| 13 | esac
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| 14 |
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| 15 | foo=bar :
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| 16 | echo foo=$foo
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| 17 |
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| 18 | # Not true when you use 'builtin'
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| 19 | z=Z builtin :
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| 20 | echo z=$Z
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| 21 |
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| 22 | ## STDOUT:
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| 23 | foo=bar
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| 24 | z=
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| 25 | ## END
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| 26 |
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| 27 | ## BUG zsh STDOUT:
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| 28 | foo=
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| 29 | z=
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| 30 | ## END
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| 31 |
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| 32 | #### readonly is special and prefix assignments persist (set -o posix)
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| 33 |
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| 34 | # Bash only implements it behind the posix option
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| 35 | case $SH in
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| 36 | bash)
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| 37 | # for bash
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| 38 | set -o posix
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| 39 | ;;
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| 40 | esac
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| 41 | foo=bar readonly spam=eggs
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| 42 | echo foo=$foo
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| 43 | echo spam=$spam
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| 44 |
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| 45 | # should NOT be exported
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| 46 | printenv.py foo
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| 47 | printenv.py spam
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| 48 |
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| 49 | ## STDOUT:
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| 50 | foo=bar
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| 51 | spam=eggs
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| 52 | None
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| 53 | None
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| 54 | ## END
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| 55 |
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| 56 | ## OK bash/osh STDOUT:
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| 57 | foo=bar
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| 58 | spam=eggs
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| 59 | bar
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| 60 | None
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| 61 | ## END
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| 62 |
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| 63 | #### Special builtins can't be redefined as shell functions : (set -o posix)
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| 64 | case $SH in
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| 65 | bash)
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| 66 | set -o posix
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| 67 | ;;
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| 68 | esac
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| 69 |
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| 70 | eval 'echo hi'
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| 71 |
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| 72 | eval() {
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| 73 | echo 'sh func' "$@"
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| 74 | }
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| 75 |
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| 76 | eval 'echo hi'
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| 77 |
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| 78 | ## status: 2
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| 79 | ## STDOUT:
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| 80 | hi
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| 81 | ## END
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| 82 |
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| 83 | ## BUG mksh status: 0
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| 84 | ## BUG mksh STDOUT:
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| 85 | hi
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| 86 | hi
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| 87 | ## END
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| 88 |
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| 89 | ## BUG zsh status: 0
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| 90 | ## BUG zsh STDOUT:
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| 91 | hi
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| 92 | sh func echo hi
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| 93 | ## END
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| 94 |
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| 95 | #### Non-special builtins CAN be redefined as functions
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| 96 | test -n "$BASH_VERSION" && set -o posix
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| 97 | true() {
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| 98 | echo 'true func'
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| 99 | }
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| 100 | true hi
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| 101 | echo status=$?
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| 102 | ## STDOUT:
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| 103 | true func
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| 104 | status=0
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| 105 | ## END
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| 106 |
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| 107 | #### true is not special; prefix assignments don't persist
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| 108 | foo=bar true
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| 109 | echo $foo
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| 110 | ## stdout:
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| 111 |
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| 112 | #### Shift is special and the whole script exits if it returns non-zero
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| 113 | $SH -c '
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| 114 | if test -n "$BASH_VERSION"; then
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| 115 | set -o posix
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| 116 | fi
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| 117 | set -- a b
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| 118 | shift 3
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| 119 | echo status=$?
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| 120 | '
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| 121 | if test "$?" != 0; then
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| 122 | echo 'non-zero status'
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| 123 | fi
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| 124 |
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| 125 | ## STDOUT:
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| 126 | non-zero status
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| 127 | ## END
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| 128 |
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| 129 | ## BUG bash/zsh/ash status: 0
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| 130 | ## BUG bash/zsh/ash STDOUT:
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| 131 | status=1
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| 132 | ## END
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| 133 |
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| 134 | #### set is special and fails, even if using || true
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| 135 | $SH -c '
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| 136 | shopt -s invalid_ || true
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| 137 | echo ok
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| 138 | set -o invalid_ || true
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| 139 | echo should not get here
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| 140 | '
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| 141 | if test "$?" != 0; then
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| 142 | echo 'non-zero status'
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| 143 | fi
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| 144 |
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| 145 | ## STDOUT:
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| 146 | ok
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| 147 | non-zero status
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| 148 | ## END
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| 149 |
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| 150 | ## BUG bash/ash status: 0
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| 151 | ## BUG bash/ash STDOUT:
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| 152 | ok
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| 153 | should not get here
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| 154 | ## END
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| 155 |
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| 156 | #### bash 'type' gets confused - says 'function', but runs builtin
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| 157 | case $SH in dash|mksh|zsh|ash) exit ;; esac
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| 158 |
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| 159 | echo TRUE
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| 160 | type -t true # builtin
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| 161 | true() { echo true func; }
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| 162 | type -t true # now a function
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| 163 | echo ---
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| 164 |
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| 165 | echo EVAL
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| 166 |
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| 167 | type -t eval # builtin
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| 168 | # define function before set -o posix
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| 169 | eval() { echo "$1"; }
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| 170 | # bash runs the FUNCTION, but OSH finds the special builtin
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| 171 | # OSH doesn't need set -o posix
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| 172 | eval 'echo before posix'
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| 173 |
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| 174 | if test -n "$BASH_VERSION"; then
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| 175 | # this makes the eval definition invisible!
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| 176 | set -o posix
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| 177 | fi
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| 178 |
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| 179 | eval 'echo after posix' # this is the builtin eval
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| 180 | # it claims it's a function, but it's a builtin
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| 181 | type -t eval
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| 182 |
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| 183 | # it finds the function and the special builtin
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| 184 | #type -a eval
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| 185 |
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| 186 | ## OK bash STDOUT:
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| 187 | TRUE
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| 188 | builtin
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| 189 | function
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| 190 | ---
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| 191 | EVAL
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| 192 | builtin
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| 193 | echo before posix
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| 194 | after posix
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| 195 | function
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| 196 | ## END
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| 197 |
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| 198 | ## OK osh STDOUT:
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| 199 | TRUE
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| 200 | builtin
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| 201 | function
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| 202 | ---
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| 203 | EVAL
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| 204 | builtin
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| 205 | before posix
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| 206 | after posix
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| 207 | function
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| 208 | ## END
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| 209 |
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| 210 | ## N-I dash/mksh/zsh/ash STDOUT:
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| 211 | ## END
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| 212 |
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| 213 | #### command, builtin - both can be redefined, not special (regression)
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| 214 | case $SH in dash|ash) exit ;; esac
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| 215 |
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| 216 | builtin echo b
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| 217 | command echo c
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| 218 |
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| 219 | builtin() {
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| 220 | echo builtin-redef "$@"
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| 221 | }
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| 222 |
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| 223 | command() {
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| 224 | echo command-redef "$@"
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| 225 | }
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| 226 |
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| 227 | builtin echo b
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| 228 | command echo c
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| 229 |
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| 230 | ## STDOUT:
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| 231 | b
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| 232 | c
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| 233 | builtin-redef echo b
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| 234 | command-redef echo c
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| 235 | ## END
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| 236 | ## N-I dash/ash STDOUT:
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| 237 | ## END
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