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Let demo scripts declare their dependencies

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Demo scripts should declare their build-time dependencies, to make
them more user-friendly. If a dependency is not met, users should see
an explicit message rather than an incomprehensible error.

Don't rely on the dependencies of individual programs because some
demo scripts use multiple programs and because some scripts might have
additional requirements.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-04-23 18:50:37 +02:00
parent 958be36b19
commit b2bcdc1c17
1 changed files with 18 additions and 0 deletions
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18
programs/demo_common.sh
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@ -6,6 +6,10 @@
## Include this file near the top of each demo script:
## . "${0%/*}/../demo_common.sh"
##
## Start with a "msg" call that explains the purpose of the script.
## Then call the "depends_on" function to ensure that all config
## dependencies are met.
##
## As the last thing in the script, call the cleanup function.
##
## You can use the functions and variables described below.
@ -79,6 +83,20 @@ config_has () {
done
}
## depends_on SYMBOL...
## Exit if the library configuration does not have all SYMBOLs set.
depends_on () {
if ! config_has "$@"; then
cat >&2 <<EOF
This demo script requires the following configuration options to be enabled
at compile time:
$@
EOF
# Exit with a success status so that this counts as a pass for run_demos.py.
exit
fi
}
## Add the names of files to clean up to this whitespace-separated variable.
## The file names must not contain whitespace characters.
files_to_clean=