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@smoser
Last active February 14, 2024 15:36
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catch-fail - trap failure and sleep so as to enter a melange build for dbug

catch-fail - trap and sleep to enter a melange build for debug

Usage: catch-fail op

   catch-fail is used to help debug a melange build.  In a 'run' section
   you can add at the top:

      eval $(/home/build/catch-fail eval-trap 1h)

   And then if the section fails it will block for 1 hour so that
   from the outside you can run

      catch-fail enter
#!/bin/sh
# vi: ts=4 expandtab
# https://gist.github.com/smoser/84909431c72e6409251c8897ac816872
Usage() {
local me=${0#**/}
cat <<EOF
Usage: $me op
This is tested with bubblewrap (bwrap) backend.
It will need adjusting for docker or other backend.
The setgid and setuid values probably need changing on other system.
$me is used to help debug a melange build. In a 'run' section
you can add at the top:
eval \$(/home/build/catch-fail eval-trap 1h)
And then if the section fails it will block for 1 hour so that
from the outside you can run
$me enter
EOF
}
case "$1" in
enter)
p=$(ps axww | awk '/CATCH-FAIL/ { print $1; exit; }');
( [ -n "$p" ] || { echo "no pid found"; exit 1; };
echo pid=$p; sudo nsenter -a --setgid 1002 --setuid 1001 -t $p /bin/sh )
;;
eval-trap)
p='rc=$?; [ $rc -eq 0 ] || '\"$0\"' CATCH-FAIL '\"${2:-30m}\"' $rc'
echo trap "'$p'" EXIT
;;
-h|--help)
Usage
exit
;;
CATCH-FAIL)
nap=${2:-30m}
rc=${3:-"-1"}
sleep ${nap} &
pid=$!
echo "============ section failed with rc $rc ==============="
echo "============ sleeping for $nap in $pid ================"
echo "I am: $(id)"
echo "I had $# args: $*"
wait $pid
;;
*) Usage 1>&2;
exit 1;;
esac
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