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138 lines
3.5 KiB
Bash
138 lines
3.5 KiB
Bash
## Common shell functions used by demo scripts programs/*/*.sh.
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## How to write a demo script
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## ==========================
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##
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## Include this file near the top of each demo script:
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## . "${0%/*}/../demo_common.sh"
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##
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## Start with a "msg" call that explains the purpose of the script.
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## Then call the "depends_on" function to ensure that all config
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## dependencies are met.
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##
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## As the last thing in the script, call the cleanup function.
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##
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## You can use the functions and variables described below.
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set -e -u
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## $root_dir is the root directory of the Mbed TLS source tree.
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root_dir="${0%/*}"
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# Find a nice path to the root directory, avoiding unnecessary "../".
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# The code supports demo scripts nested up to 4 levels deep.
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# The code works no matter where the demo script is relative to the current
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# directory, even if it is called with a relative path.
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n=4 # limit the search depth
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while ! [ -d "$root_dir/programs" ] || ! [ -d "$root_dir/library" ]; do
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if [ $n -eq 0 ]; then
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echo >&2 "This doesn't seem to be an Mbed TLS source tree."
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exit 125
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fi
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n=$((n - 1))
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case $root_dir in
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.) root_dir="..";;
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..|?*/..) root_dir="$root_dir/..";;
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?*/*) root_dir="${root_dir%/*}";;
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/*) root_dir="/";;
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*) root_dir=".";;
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esac
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done
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## $programs_dir is the directory containing the sample programs.
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# Assume an in-tree build.
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programs_dir="$root_dir/programs"
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## msg LINE...
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## msg <TEXT_ORIGIN
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## Display an informational message.
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msg () {
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if [ $# -eq 0 ]; then
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sed 's/^/# /'
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else
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for x in "$@"; do
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echo "# $x"
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done
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fi
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}
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## run "Message" COMMAND ARGUMENT...
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## Display the message, then run COMMAND with the specified arguments.
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run () {
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echo
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echo "# $1"
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shift
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echo "+ $*"
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"$@"
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}
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## Like '!', but stop on failure with 'set -e'
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not () {
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if "$@"; then false; fi
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}
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## run_bad "Message" COMMAND ARGUMENT...
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## Like run, but the command is expected to fail.
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run_bad () {
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echo
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echo "$1 This must fail."
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shift
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echo "+ ! $*"
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not "$@"
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}
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## config_has SYMBOL...
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## Succeeds if the library configuration has all SYMBOLs set.
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config_has () {
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for x in "$@"; do
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"$programs_dir/test/query_compile_time_config" "$x"
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done
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}
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## depends_on SYMBOL...
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## Exit if the library configuration does not have all SYMBOLs set.
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depends_on () {
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m=
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for x in "$@"; do
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if ! config_has "$x"; then
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m="$m $x"
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fi
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done
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if [ -n "$m" ]; then
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cat >&2 <<EOF
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$0: this demo requires the following
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configuration options to be enabled at compile time:
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$m
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EOF
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# Exit with a success status so that this counts as a pass for run_demos.py.
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exit
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fi
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}
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## Add the names of files to clean up to this whitespace-separated variable.
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## The file names must not contain whitespace characters.
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files_to_clean=
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## Call this function at the end of each script.
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## It is called automatically if the script is killed by a signal.
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cleanup () {
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rm -f -- $files_to_clean
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}
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################################################################
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## End of the public interfaces. Code beyond this point is not
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## meant to be called directly from a demo script.
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trap 'cleanup; trap - HUP; kill -HUP $$' HUP
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trap 'cleanup; trap - INT; kill -INT $$' INT
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trap 'cleanup; trap - TERM; kill -TERM $$' TERM
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if config_has MBEDTLS_ENTROPY_NV_SEED; then
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# Create a seedfile that's sufficiently long in all library configurations.
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# This is necessary for programs that use randomness.
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# Assume that the name of the seedfile is the default name.
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files_to_clean="$files_to_clean seedfile"
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dd if=/dev/urandom of=seedfile ibs=64 obs=64 count=1
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fi
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