39 lines
1.2 KiB
Bash
39 lines
1.2 KiB
Bash
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#!/bin/bash
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## Function Definitions
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## Function: trap_push 'COMMAND_STRING'
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## Appends a command to a trap, which is needed because default trap behavior is to replace
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## previous trap for the same signal
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## - 1st arg: code to add
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## - ref: http://stackoverflow.com/questions/3338030/multiple-bash-traps-for-the-same-signal
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_trap_push() {
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local next="$1"
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eval "trap_push() {
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local oldcmd='$(echo "$next" | sed -e s/\'/\'\\\\\'\'/g)'
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local newcmd=\"\$1; \$oldcmd\"
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trap -- \"\$newcmd\" EXIT INT TERM HUP
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_trap_push \"\$newcmd\"
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}"
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}
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_trap_push true
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## Function: warn MESSAGE
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## Print message to stderr
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warn() {
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local message="$1"
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echo "$message" >&2
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}
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## Function: die MESSAGE
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## Print message to stderr and exit the whole process
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## Note:
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## Using () makes the command inside them run in a sub-shell and calling a exit from there
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## causes you to exit the sub-shell and not your original shell, hence execution continues in
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## your original shell. To overcome this use { }
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## ref: http://stackoverflow.com/questions/3822621/how-to-exit-if-a-command-failed
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die() {
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local message="$1"
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warn "$message"
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exit 1
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}
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