ReachableCEO
d82c8733fa
shifting away from invoking via curl and using a downloaded zip file or git clone.
54 lines
1.8 KiB
Bash
54 lines
1.8 KiB
Bash
#!/bin/bash
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# Standard strict mode and error handling/tracing boilderplate..
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# This is a function I include and execute in every shell script that I write.
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# It sets up a bunch of error handling odds and ends
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# Bits and pieces Sourced from (as best I recall):
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# * https://news.ycombinator.com/item?id=24727495
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# * many other hacker news / slashdot etc posts over the years
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# * https://www.tothenew.com/blog/foolproof-your-bash-script-some-best-practices/
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# * https://translucentcomputing.com/2020/05/unofficial-bash-strict-mode-errexit/
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# * http://redsymbol.net/articles/unofficial-bash-strict-mode/
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# * the school of hard knocks... (aka my code failures...)
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#Here's the beef (as the commercial says..)
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export PS4='(${BASH_SOURCE}:${LINENO}): - [${SHLVL},${BASH_SUBSHELL},$?] $ '
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function error_out()
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{
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echo "Bailing out. See above for reason...."
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exit 1
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}
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function handle_failure() {
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local lineno=$1
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local fn=$2
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local exitstatus=$3
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local msg=$4
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local lineno_fns=${0% 0}
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if [[ "$lineno_fns" != "-1" ]] ; then
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lineno="${lineno} ${lineno_fns}"
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fi
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echo "${BASH_SOURCE[0]}: Function: ${fn} Line Number : [${lineno}] Failed with status ${exitstatus}: $msg"
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}
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trap 'handle_failure "${BASH_LINENO[*]}" "$LINENO" "${FUNCNAME[*]:-script}" "$?" "$BASH_COMMAND"' ERR
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#use errexit (a.k.a. set -e) to make your script exit when a command fails.
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#add || true to commands that you allow to fail.
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set -o errexit
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# Use set -o nounset (a.k.a. set -u) to exit when your script tries to use undeclared
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# variables.
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set -o nounset
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#Use set -o pipefail in scripts to catch (for example) mysqldump fails
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#in e.g. mysqldump |gzip.
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#The exit status of the last command that threw a non-zero exit code is returned
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set -o pipefail
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#Function tracing...
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set -o functrace |