| 1 | ## oils_failures_allowed: 2
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| 2 | ## compare_shells: bash
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| 3 |
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| 4 | # Notes on bash semantics:
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| 5 |
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| 6 | # https://www.gnu.org/software/bash/manual/bash.html
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| 7 | #
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| 8 | # Commands specified with a DEBUG trap are executed before every simple
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| 9 | # command, for command, case command, select command, every arithmetic for
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| 10 | # command, and before the first command executes in a shell function. The DEBUG
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| 11 | # trap is not inherited by shell functions unless the function has been given
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| 12 | # the trace attribute or the functrace option has been enabled using the shopt
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| 13 | # builtin. The extdebug shell option has additional effects on the DEBUG trap.
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| 14 |
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| 15 | #### trap -l
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| 16 | trap -l | grep INT >/dev/null
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| 17 | ## status: 0
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| 18 |
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| 19 |
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| 20 | #### trap -p
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| 21 |
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| 22 | trap 'echo exit' EXIT
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| 23 |
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| 24 | trap -p > parent.txt
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| 25 |
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| 26 | grep EXIT parent.txt >/dev/null
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| 27 | if test $? -eq 0; then
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| 28 | echo shown
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| 29 | else
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| 30 | echo not shown
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| 31 | fi
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| 32 |
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| 33 | ## STDOUT:
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| 34 | shown
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| 35 | exit
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| 36 | ## END
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| 37 |
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| 38 | #### trap -p in child is BUGGY in bash
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| 39 |
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| 40 | # It shows the trap even though it doesn't execute it!
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| 41 |
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| 42 | trap 'echo exit' EXIT
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| 43 |
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| 44 | trap -p | cat > child.txt
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| 45 |
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| 46 | grep EXIT child.txt >/dev/null
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| 47 | if test $? -eq 0; then
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| 48 | echo shown
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| 49 | else
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| 50 | echo not shown
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| 51 | fi
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| 52 |
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| 53 | ## STDOUT:
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| 54 | not shown
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| 55 | exit
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| 56 | ## END
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| 57 | ## BUG bash STDOUT:
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| 58 | shown
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| 59 | exit
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| 60 | ## END
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| 61 |
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| 62 | #### trap DEBUG ignores $?
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| 63 | debuglog() {
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| 64 | echo " [$@]"
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| 65 | return 42 # IGNORED FAILURE
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| 66 | }
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| 67 |
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| 68 | trap 'debuglog $LINENO' DEBUG
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| 69 |
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| 70 | echo status=$?
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| 71 | echo A
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| 72 | echo status=$?
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| 73 | echo B
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| 74 | echo status=$?
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| 75 |
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| 76 | ## STDOUT:
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| 77 | [8]
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| 78 | status=0
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| 79 | [9]
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| 80 | A
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| 81 | [10]
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| 82 | status=0
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| 83 | [11]
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| 84 | B
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| 85 | [12]
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| 86 | status=0
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| 87 | ## END
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| 88 |
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| 89 | #### but trap DEBUG respects errexit
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| 90 | set -o errexit
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| 91 |
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| 92 | debuglog() {
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| 93 | echo " [$@]"
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| 94 | return 42
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| 95 | }
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| 96 |
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| 97 | trap 'debuglog $LINENO' DEBUG
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| 98 |
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| 99 | echo status=$?
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| 100 | echo A
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| 101 | echo status=$?
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| 102 | echo B
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| 103 | echo status=$?
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| 104 |
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| 105 | ## status: 42
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| 106 | ## STDOUT:
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| 107 | [10]
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| 108 | ## END
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| 109 |
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| 110 | #### trap DEBUG with 'return'
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| 111 |
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| 112 | debuglog() {
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| 113 | echo " [$@]"
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| 114 | }
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| 115 |
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| 116 | trap 'debuglog $LINENO; return 42' DEBUG
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| 117 |
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| 118 | echo status=$?
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| 119 | echo A
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| 120 | echo status=$?
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| 121 | echo B
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| 122 | echo status=$?
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| 123 |
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| 124 | ## status: 0
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| 125 |
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| 126 | ## STDOUT:
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| 127 | [7]
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| 128 | status=0
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| 129 | [8]
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| 130 | A
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| 131 | [9]
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| 132 | status=0
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| 133 | [10]
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| 134 | B
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| 135 | [11]
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| 136 | status=0
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| 137 | ## END
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| 138 |
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| 139 | # OSH doesn't ignore this
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| 140 |
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| 141 | ## OK osh status: 42
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| 142 | ## OK osh STDOUT:
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| 143 | [7]
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| 144 | ## END
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| 145 |
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| 146 | #### trap DEBUG with 'exit'
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| 147 | debuglog() {
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| 148 | echo " [$@]"
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| 149 | }
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| 150 |
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| 151 | trap 'debuglog $LINENO; exit 42' DEBUG
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| 152 |
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| 153 | echo status=$?
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| 154 | echo A
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| 155 | echo status=$?
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| 156 | echo B
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| 157 | echo status=$?
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| 158 |
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| 159 | ## status: 42
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| 160 | ## STDOUT:
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| 161 | [7]
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| 162 | ## END
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| 163 |
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| 164 |
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| 165 |
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| 166 | #### trap DEBUG with non-compound commands
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| 167 | case $SH in (dash|mksh) exit ;; esac
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| 168 |
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| 169 | debuglog() {
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| 170 | echo " [$@]"
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| 171 | }
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| 172 | trap 'debuglog $LINENO' DEBUG
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| 173 |
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| 174 | echo a
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| 175 | echo b; echo c
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| 176 |
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| 177 | echo d && echo e
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| 178 | echo f || echo g
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| 179 |
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| 180 | (( h = 42 ))
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| 181 | [[ j == j ]]
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| 182 |
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| 183 | var=value
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| 184 |
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| 185 | readonly r=value
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| 186 |
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| 187 | ## STDOUT:
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| 188 | [8]
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| 189 | a
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| 190 | [9]
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| 191 | b
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| 192 | [9]
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| 193 | c
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| 194 | [11]
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| 195 | d
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| 196 | [11]
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| 197 | e
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| 198 | [12]
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| 199 | f
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| 200 | [14]
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| 201 | [15]
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| 202 | [17]
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| 203 | [19]
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| 204 | ## END
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| 205 |
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| 206 | #### trap DEBUG and control flow
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| 207 |
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| 208 | debuglog() {
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| 209 | echo " [$@]"
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| 210 | }
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| 211 | trap 'debuglog $LINENO' DEBUG
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| 212 |
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| 213 | while true; do
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| 214 | echo hello
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| 215 | break
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| 216 | done
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| 217 |
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| 218 | ## STDOUT:
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| 219 | [6]
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| 220 | [7]
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| 221 | hello
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| 222 | [8]
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| 223 | ## END
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| 224 | ## STDOUT:
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| 225 | [6]
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| 226 | [7]
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| 227 | hello
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| 228 | [8]
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| 229 | ## END
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| 230 |
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| 231 | #### trap DEBUG and command sub / subshell
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| 232 | case $SH in (dash|mksh) exit ;; esac
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| 233 |
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| 234 | debuglog() {
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| 235 | echo " [$@]"
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| 236 | }
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| 237 | trap 'debuglog $LINENO' DEBUG
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| 238 |
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| 239 | echo "result = $(echo command sub; echo two)"
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| 240 | ( echo subshell
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| 241 | echo two
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| 242 | )
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| 243 | echo done
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| 244 |
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| 245 | ## STDOUT:
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| 246 | [8]
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| 247 | result = command sub
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| 248 | two
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| 249 | subshell
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| 250 | two
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| 251 | [12]
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| 252 | done
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| 253 | ## END
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| 254 |
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| 255 | #### trap DEBUG not run in forked interpreter for first pipeline part
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| 256 |
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| 257 | debuglog() {
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| 258 | #echo " PID=$$ BASHPID=$BASHPID LINENO=$1"
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| 259 | echo " LINENO=$1"
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| 260 | }
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| 261 | trap 'debuglog $LINENO' DEBUG
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| 262 |
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| 263 | { echo pipe1;
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| 264 | echo pipe2; } \
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| 265 | | cat
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| 266 | echo ok
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| 267 |
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| 268 | ## STDOUT:
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| 269 | LINENO=8
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| 270 | pipe1
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| 271 | pipe2
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| 272 | LINENO=9
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| 273 | ok
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| 274 | ## END
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| 275 |
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| 276 | #### One 'echo' in first pipeline part - why does bash behave differently from case above?
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| 277 |
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| 278 | # TODO: bash runs the trap 3 times, and osh only twice. I don't see why. Is
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| 279 | # it because Process::Run() does trap_state.ClearForSubProgram()? Probably
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| 280 | #echo top PID=$$ BASHPID=$BASHPID
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| 281 | #shopt -s lastpipe
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| 282 |
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| 283 | debuglog() {
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| 284 | #echo " PID=$$ BASHPID=$BASHPID LINENO=$1"
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| 285 | #echo " LINENO=$1 $BASH_COMMAND"
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| 286 | # LINENO=6 echo pipeline
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| 287 | # LINENO=7 cat
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| 288 | echo " LINENO=$1"
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| 289 | }
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| 290 | trap 'debuglog $LINENO' DEBUG
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| 291 |
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| 292 | echo pipeline \
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| 293 | | cat
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| 294 | echo ok
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| 295 |
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| 296 | ## STDOUT:
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| 297 | LINENO=6
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| 298 | LINENO=7
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| 299 | pipeline
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| 300 | LINENO=8
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| 301 | ok
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| 302 | ## END
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| 303 | ## OK osh STDOUT:
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| 304 | LINENO=7
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| 305 | pipeline
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| 306 | LINENO=8
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| 307 | ok
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| 308 | ## END
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| 309 |
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| 310 | #### trap DEBUG and pipeline (lastpipe difference)
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| 311 | debuglog() {
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| 312 | echo " [$@]"
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| 313 | }
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| 314 | trap 'debuglog $LINENO' DEBUG
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| 315 |
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| 316 | # gets run for each one of these
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| 317 | { echo a; echo b; }
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| 318 |
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| 319 | # only run for the last one, maybe I guess because traps aren't inherited?
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| 320 | { echo x; echo y; } | wc -l
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| 321 |
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| 322 | # bash runs for all of these, but OSH doesn't because we have SubProgramThunk
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| 323 | # Hm.
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| 324 | date | cat | wc -l
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| 325 |
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| 326 | date |
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| 327 | cat |
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| 328 | wc -l
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| 329 |
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| 330 | ## STDOUT:
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| 331 | [6]
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| 332 | a
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| 333 | [6]
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| 334 | b
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| 335 | [8]
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| 336 | 2
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| 337 | [10]
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| 338 | [10]
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| 339 | [10]
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| 340 | 1
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| 341 | [12]
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| 342 | [13]
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| 343 | [14]
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| 344 | 1
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| 345 | ## END
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| 346 |
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| 347 | # Marking OK due to lastpipe execution difference
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| 348 |
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| 349 | ## OK osh STDOUT:
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| 350 | [6]
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| 351 | a
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| 352 | [6]
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| 353 | b
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| 354 | [8]
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| 355 | 2
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| 356 | [10]
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| 357 | 1
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| 358 | [14]
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| 359 | 1
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| 360 | ## END
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| 361 |
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| 362 | #### trap DEBUG function call
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| 363 | debuglog() {
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| 364 | echo " [$@]"
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| 365 | }
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| 366 | trap 'debuglog $LINENO' DEBUG
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| 367 |
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| 368 | f() {
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| 369 | local mylocal=1
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| 370 | for i in "$@"; do
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| 371 | echo i=$i
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| 372 | done
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| 373 | }
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| 374 |
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| 375 | f A B # executes ONCE here, but does NOT go into the function call
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| 376 |
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| 377 | echo next
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| 378 |
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| 379 | f X Y
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| 380 |
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| 381 | echo ok
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| 382 |
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| 383 | ## STDOUT:
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| 384 | [13]
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| 385 | i=A
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| 386 | i=B
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| 387 | [15]
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| 388 | next
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| 389 | [17]
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| 390 | i=X
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| 391 | i=Y
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| 392 | [19]
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| 393 | ok
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| 394 | ## END
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| 395 |
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| 396 | #### trap DEBUG case
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| 397 | debuglog() {
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| 398 | echo " [$@]"
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| 399 | }
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| 400 | trap 'debuglog $LINENO' DEBUG
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| 401 |
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| 402 | name=foo.py
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| 403 |
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| 404 | case $name in
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| 405 | *.py)
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| 406 | echo python
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| 407 | ;;
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| 408 | *.sh)
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| 409 | echo shell
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| 410 | ;;
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| 411 | esac
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| 412 | echo ok
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| 413 |
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| 414 | ## STDOUT:
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| 415 | [6]
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| 416 | [8]
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| 417 | [10]
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| 418 | python
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| 419 | [16]
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| 420 | ok
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| 421 | ## END
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| 422 |
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| 423 | #### trap DEBUG for each
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| 424 |
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| 425 | debuglog() {
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| 426 | echo " [$@]"
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| 427 | }
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| 428 | trap 'debuglog $LINENO' DEBUG
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| 429 |
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| 430 | for x in 1 2; do
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| 431 | echo x=$x
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| 432 | done
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| 433 |
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| 434 | echo ok
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| 435 |
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| 436 | ## STDOUT:
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| 437 | [6]
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| 438 | [7]
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| 439 | x=1
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| 440 | [6]
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| 441 | [7]
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| 442 | x=2
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| 443 | [10]
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| 444 | ok
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| 445 | ## END
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| 446 |
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| 447 | # NOT matching bash right now because 'while' loops don't have it
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| 448 | # And we have MORE LOOPS
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| 449 | #
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| 450 | # What we really need is a trap that runs in the main loop and TELLS you what
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| 451 | # kind of node it is?
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| 452 |
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| 453 | ## N-I osh STDOUT:
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| 454 | [7]
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| 455 | x=1
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| 456 | [7]
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| 457 | x=2
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| 458 | [10]
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| 459 | ok
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| 460 | ## END
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| 461 |
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| 462 | #### trap DEBUG for expr
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| 463 | debuglog() {
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| 464 | echo " [$@]"
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| 465 | }
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| 466 | trap 'debuglog $LINENO' DEBUG
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| 467 |
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| 468 | for (( i =3 ; i < 5; ++i )); do
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| 469 | echo i=$i
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| 470 | done
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| 471 |
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| 472 | echo ok
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| 473 |
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| 474 | ## STDOUT:
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| 475 | [6]
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| 476 | [6]
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| 477 | [7]
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| 478 | i=3
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| 479 | [6]
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| 480 | [6]
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| 481 | [7]
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| 482 | i=4
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| 483 | [6]
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| 484 | [6]
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| 485 | [10]
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| 486 | ok
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| 487 | ## END
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| 488 | ## N-I osh STDOUT:
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| 489 | [7]
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| 490 | i=3
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| 491 | [7]
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| 492 | i=4
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| 493 | [10]
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| 494 | ok
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| 495 | ## END
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| 496 |
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| 497 | #### trap DEBUG if while
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| 498 | debuglog() {
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| 499 | echo " [$@]"
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| 500 | }
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| 501 | trap 'debuglog $LINENO' DEBUG
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| 502 |
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| 503 | if test x = x; then
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| 504 | echo if
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| 505 | fi
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| 506 |
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| 507 | while test x != x; do
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| 508 | echo while
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| 509 | done
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| 510 |
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| 511 | ## STDOUT:
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| 512 | [6]
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| 513 | [7]
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| 514 | if
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| 515 | [10]
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| 516 | ## END
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| 517 |
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| 518 |
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| 519 | #### trap RETURN
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| 520 | profile() {
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| 521 | echo "profile [$@]"
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| 522 | }
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| 523 | g() {
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| 524 | echo --
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| 525 | echo g
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| 526 | echo --
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| 527 | return
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| 528 | }
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| 529 | f() {
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| 530 | echo --
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| 531 | echo f
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| 532 | echo --
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| 533 | g
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| 534 | }
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| 535 | # RETURN trap doesn't fire when a function returns, only when a script returns?
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| 536 | # That's not what the manual says.
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| 537 | trap 'profile x y' RETURN
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| 538 | f
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| 539 | . $REPO_ROOT/spec/testdata/return-helper.sh
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| 540 | ## status: 42
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| 541 | ## STDOUT:
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| 542 | --
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| 543 | f
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| 544 | --
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| 545 | --
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| 546 | g
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| 547 | --
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| 548 | return-helper.sh
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| 549 | profile [x y]
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| 550 | ## END
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| 551 |
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| 552 | #### Compare trap DEBUG vs. trap ERR
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| 553 |
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| 554 | # Pipelines and AndOr are problematic
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| 555 |
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| 556 | # THREE each
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| 557 | trap 'echo dbg $LINENO' DEBUG
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| 558 |
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| 559 | false | false | false
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| 560 |
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| 561 | false || false || false
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| 562 |
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| 563 | ! true
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| 564 |
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| 565 | trap - DEBUG
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| 566 |
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| 567 |
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| 568 | # ONE EACH
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| 569 | trap 'echo err $LINENO' ERR
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| 570 |
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| 571 | false | false | false
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| 572 |
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| 573 | false || false || false
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| 574 |
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| 575 | ! true # not run
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| 576 |
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| 577 | echo ok
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| 578 |
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| 579 | ## STDOUT:
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| 580 | dbg 3
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| 581 | dbg 3
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| 582 | dbg 3
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| 583 | dbg 5
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| 584 | dbg 5
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| 585 | dbg 5
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| 586 | dbg 7
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| 587 | dbg 9
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| 588 | err 14
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| 589 | err 16
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| 590 | ok
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| 591 | ## END
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| 592 |
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| 593 |
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| 594 | #### Combine DEBUG trap and USR1 trap
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| 595 |
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| 596 | case $SH in dash|mksh|ash) exit ;; esac
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| 597 |
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| 598 | trap 'false; echo $LINENO usr1' USR1
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| 599 | trap 'false; echo $LINENO dbg' DEBUG
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| 600 |
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| 601 | sh -c "kill -USR1 $$"
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| 602 | echo after=$?
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| 603 |
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| 604 | ## STDOUT:
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| 605 | 6 dbg
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| 606 | 1 dbg
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| 607 | 1 dbg
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| 608 | 1 usr1
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| 609 | 7 dbg
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| 610 | after=0
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| 611 | ## END
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| 612 |
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| 613 | ## N-I dash/mksh/ash STDOUT:
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| 614 | ## END
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| 615 |
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| 616 | #### Combine ERR trap and USR1 trap
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| 617 |
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| 618 | case $SH in dash|mksh|ash) exit ;; esac
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| 619 |
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| 620 | trap 'false; echo $LINENO usr1' USR1
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| 621 | trap 'false; echo $LINENO err' ERR
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| 622 |
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| 623 | sh -c "kill -USR1 $$"
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| 624 | echo after=$?
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| 625 |
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| 626 | ## STDOUT:
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| 627 | 1 err
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| 628 | 1 usr1
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| 629 | after=0
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| 630 | ## END
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| 631 |
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| 632 | ## N-I dash/mksh/ash STDOUT:
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| 633 | ## END
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| 634 |
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| 635 | #### Combine DEBUG trap and ERR trap
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| 636 |
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| 637 | case $SH in dash|mksh|ash) exit ;; esac
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| 638 |
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| 639 | trap 'false; echo $LINENO err' ERR
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| 640 | trap 'false; echo $LINENO debug' DEBUG
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| 641 |
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| 642 | false
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| 643 | echo after=$?
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| 644 |
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| 645 | ## STDOUT:
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| 646 | 6 err
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| 647 | 6 debug
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| 648 | 6 debug
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| 649 | 6 debug
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| 650 | 6 err
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| 651 | 7 err
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| 652 | 7 debug
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| 653 | after=1
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| 654 | ## END
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| 655 |
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| 656 | ## N-I dash/mksh/ash STDOUT:
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| 657 | ## END
|