====== 2017-03-16 - starting a script ======

some time ago we had an issue on [[wp>continuous integration|CI]] build machines. on test environment, failed builds did not fail. all CI did was to run a simple bash script -- sth along these lines:

<code bash>
#!/bin/bash -ex
cd /build/path
cmake /source/dir
ninja
ctest
</code>

we double-checked that build errors failed the script locally, but not on our CI. after a bit of digging it turned out that CI is running scripts like this:
<code bash>
bash /path/to/ci/script
</code>
while we run these "the usual way":
<code bash>
cd /path/to/ci
./script
</code>

difference? when source-running, bash-bang is ignored! :) this in turn means that stopping on error was not honored -- the rest you already know.

answer? update your script:
<code bash>
#!/bin/bash
set -ex       # NOTE: changing shell settings inside the script, not bash-bang
cd /build/path
cmake /source/dir
ninja
ctest
</code>