possibility to control settings of shell used to execute actions

[mapiri]

Hi,
we have had issues with actions where the last command is always succeeding, e.g. echo "...", which potentially hides previous commands failing (exiting with nonzero exit code), i.e. compilation appears successful even though an error has happened. In regular bash scripts one can insert a 'set -eo pipefail' or similar. Is this possible to do so for the shell in which the actions are executed?
Thanks,
LS

[grafikrobot]

If the actions you want this for are your own and specific ones you can just add the set ... command directly at the start of the actions. Otherwise, if you want it globally, the one control that exists currently is to set the JAMSHELL env var (https://www.bfgroup.xyz/b2/manual/release/index.html#jam.language.variables.builtins.jamshell). That limits you to the base set option flags though.

[mapiri]

I have tried setting JAMSHELL to script containing the following:

#!/bin/sh
set -eo pipefail
sh -c "set -eo pipefail; $2"

but it didn't work. Did I do something wrong? I had tried adding set ... as first statement in the action and it worked, but we would like a global solution.
Thanks,
LS

[mapiri]

Sorry, made a copy paste error. Using
eval "$2"
instead of the extra sh call works as you suggested.

[mapiri]

Problem solved, thanks, LS