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77 lines
2.5 KiB
77 lines
2.5 KiB
4 months ago
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#!/bin/bash
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#
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# A simple script to wrap the execution of a command so that it stores its
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# output and return value into a file and then process it to later on.
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#
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# This is meant to be used in a makefile, specifically to allow for the output
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# of a command to be stored in a file and added to the dist list, even if the
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# command actually failed.
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#
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# For example, your makefile might include:
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#
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# my_target := lint
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# my_target_output := $(OUT_DIR)/lint-output.txt
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# my_target_retval := $(OUT_DIR)/lint-retval.txt
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#
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# $(my_target_output) $(my_target_retval): PRIVATE_MODULE := $(my_target)
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# $(my_target_output) $(my_target_retval): PRIVATE_OUTPUT := $(my_target_output)
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# $(my_target_output) $(my_target_retval): PRIVATE_RETVAL := $(my_target_retval)
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# $(my_target_output) $(my_target_retval):
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# $(PATH)/wrapper.sh \
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# $(PRIVATE_MODULE) \
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# $(PRIVATE_OUTPUT) \
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# $(PRIVATE_RETVAL) \
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# wrap \
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# $(PATH)/run-list.sh $(LOCAL_PATH)/src
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#
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# $(my_target): PRIVATE_MODULE := $(my_target)
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# $(my_target): PRIVATE_OUTPUT := $(my_target_output)
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# $(my_target): PRIVATE_RETVAL := $(my_target_retval)
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# $(my_target): $(my_target_output) $(my_target_retval)
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# $(PATH)/wrapper.sh \
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# $(PRIVATE_MODULE) \
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# $(PRIVATE_OUTPUT) \
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# $(PRIVATE_RETVAL) \
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# eval
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set -euo pipefail
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# Terminate with a fatal error.
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function fatal() {
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echo "Fatal: $*"
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exit 113
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}
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function main() {
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local module="${1-}"; shift || fatal "missing argument: module"
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local output="${1-}"; shift || fatal "missing argument: output"
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local retval="${1-}"; shift || fatal "missing argument: retval"
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local action="${1-}"; shift || fatal "missing argument: action"
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# The rest of the arguments are the command to run.
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if [ "$action" = 'wrap' ]; then
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# Run the command specified by the rest of arguments ("$@") and save output
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# and return value.
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echo 0 >"${retval}"
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"$@" >"${output}" 2>&1 || echo "$?" >"${retval}"
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# Wrapping itself is always successful.
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return
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elif [ "$action" = 'eval' ]; then
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local result="$(cat "${retval}")"
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if [ "$result" = 0 ]; then
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# If successful only print the last few lines.
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tail -n 5 "$output" | sed -e "s/^/${module}: /"
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else
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# Print the entire output on failure.
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cat "$output" | sed -e "s/^/${module}: /"
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fi
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# Evaluating returns the stored return value.
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return "$result"
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else
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fatal "invalid action: $action"
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fi
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}
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main "$@"
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