| 1 | #!/usr/bin/env bash
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| 2 | #
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| 3 | # Usage:
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| 4 | # demo/bash-call-stack.sh <function name>
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| 5 |
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| 6 | set -o nounset
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| 7 | set -o pipefail
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| 8 | set -o errexit
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| 9 |
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| 10 | print-stack() {
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| 11 | local n=${#BASH_SOURCE[@]}
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| 12 | for (( i = 0; i < n; ++i)); do
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| 13 | # off by one adjustment seems more accurate, similar to
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| 14 | # https://opensource.com/article/22/7/print-stack-trace-bash-scripts
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| 15 | if false; then
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| 16 | echo "STACK:${BASH_SOURCE[i]}:${FUNCNAME[i+1]:-}:${BASH_LINENO[i]}"
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| 17 | else
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| 18 | echo "STACK:${BASH_SOURCE[i]}:${FUNCNAME[i]}:${BASH_LINENO[i]}"
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| 19 | fi
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| 20 | done
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| 21 | }
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| 22 |
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| 23 |
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| 24 | f() {
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| 25 | echo 'hi from f'
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| 26 | g
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| 27 | }
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| 28 |
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| 29 | g() {
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| 30 | echo 'hi from g'
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| 31 | print-stack
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| 32 | }
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| 33 |
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| 34 | no-error() {
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| 35 | # -1 position is the bottom of the stack
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| 36 | #
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| 37 | # It has has demo/bash-stack.sh:main:0
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| 38 | #
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| 39 | # This is tested in spec/introspect.sh
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| 40 |
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| 41 | #PS4='+ ${BASH_SOURCE[-1]}:${FUNCNAME[-1]}:${BASH_LINENO[-1]} '
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| 42 | #set -x
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| 43 | f
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| 44 | }
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| 45 |
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| 46 | do-command-error() {
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| 47 | echo 'hi from h'
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| 48 |
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| 49 | # Hm, in OSH this does trigger the err trap, but not in bash
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| 50 |
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| 51 | if false; then
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| 52 | shopt -s failglob
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| 53 | echo *.zyzyz
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| 54 | fi
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| 55 |
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| 56 | # simple command error
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| 57 | # false
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| 58 |
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| 59 | # pipeline error
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| 60 | false | true
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| 61 | }
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| 62 |
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| 63 | error-command() {
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| 64 | ### 'false' causes errexit
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| 65 |
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| 66 | set -o errtrace # needed to keep it active
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| 67 | trap 'print-stack' ERR
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| 68 |
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| 69 | do-command-error
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| 70 | }
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| 71 |
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| 72 | do-undefined-var() {
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| 73 | echo unset
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| 74 | echo $oops
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| 75 | }
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| 76 |
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| 77 | error-undefined-var() {
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| 78 | ### undefined var - no stack trace!
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| 79 |
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| 80 | # I guess you can argue this is a programming bug
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| 81 |
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| 82 | set -o errtrace # needed to keep it active
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| 83 | trap 'print-stack' ERR
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| 84 |
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| 85 | do-undefined-var
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| 86 | }
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| 87 |
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| 88 | python() {
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| 89 | cat >_tmp/callstack.py <<EOF
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| 90 | def f():
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| 91 | print("hi from f")
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| 92 | exec("g()")
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| 93 |
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| 94 | def g():
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| 95 | print("hi from g")
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| 96 | raise RuntimeError()
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| 97 |
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| 98 | f()
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| 99 | EOF
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| 100 |
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| 101 | echo
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| 102 | echo
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| 103 | set +o errexit
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| 104 |
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| 105 | # 3 frames: <module> f g
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| 106 | # and quotes the code
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| 107 | python2 _tmp/callstack.py
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| 108 |
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| 109 | cat >_tmp/callmain.py <<EOF
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| 110 | def h():
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| 111 | import callstack
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| 112 |
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| 113 | h()
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| 114 | EOF
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| 115 |
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| 116 | # 5 frames: h() imprt callstack f() g() raise
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| 117 | python2 _tmp/callmain.py
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| 118 | }
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| 119 |
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| 120 | "$@"
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| 121 |
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