modify yaml on the fly as part of a make task

Makefile

UNAME := $(shell uname)

###
#
# assuming a yaml like this:
# main:
#   device: 21
#
###

# semantic parsing and changing of the yaml
set-device-mode:
ifeq ($(UNAME), Linux)
	if ! command -v yq &> /dev/null ; then \
		wget -qO /usr/local/bin/yq https://github.com/mikefarah/yq/releases/latest/download/yq_linux_amd64; \
		chmod a+x /usr/local/bin/yq; \
    fi
endif
	yq e -i '.main.device = 22' ./params.yaml

run: set-device-mode
  echo "starting program"

Use the following pre-commit hook to revert it before checking back into VCS:

#!/bin/sh

# This hook ensures that we do not checkin a mod to the params.yaml, etc.

echo "resetting params to HEAD"
git checkout HEAD -- params.yaml
git add params.yaml

exit 0

Test replacement regex matches easily in shell:

sed -E 's/(\s+device:\s)(21)/\122/g' ./spiff_params/params.yaml  | diff params.yaml -