Makefile

.PHONY target

By default, Makefile targets are "file targets" - they are used to build files from other files. Make assumes its target is a file. These special targets are called phony and you can explicitly tell Make they're not associated with files. We don't need to use .PHONY as long as you don't have a file with the same name as the task. The task will always be executed anyway, and the Makefile will be more readable.

echo "echo \"This is clean file\""         > clean
echo "echo \"This is clean_runfile file\"" > clean_runfile

cat > Makefile <<EOF
.PHONY: clean
clean:
	cat ./clean
clean_runfile:
	cat ./clean_runfile
EOF

Running the example:

make clean # executes the commands explicitly as it has .PHONY target
cat ./clean
echo "This is clean file"

make clean_runfile 
make: 'clean_runfile' is up to date.
piotr@Sylwia-zonka:~/src/myprojects/Makfile_adventures$

Help section

define FLUXCHART_MAKE_HELP
Targets:
    generate              Generate a new chart files from flux version specified at start of Makefile.
    helmdocs              Update README.md files in chart directories.
    unittests             Run helm unittest against the charts.
    update.appversion     Update version strings in testfiles and Chart.yaml.
	update.chartversion   Bump Semver chart version.
    reviewable            Run to see if everything fits.

endef
export FLUXCHART_MAKE_HELP

.PHONY: help
help:
	@echo "$$FLUXCHART_MAKE_HELP"

Color and logging format

# ====================================================================================
# Colors

BLUE         := $(shell printf "\033[34m")
YELLOW       := $(shell printf "\033[33m")
RED          := $(shell printf "\033[31m")
GREEN        := $(shell printf "\033[32m")
CNone        := $(shell printf "\033[0m")

# ====================================================================================
# Logger

TIME_LONG	= `date +%Y-%m-%d' '%H:%M:%S`
TIME_SHORT	= `date +%H:%M:%S`
TIME		= $(TIME_SHORT)

INFO	= echo ${TIME} ${BLUE}[ .. ]${CNone}
WARN	= echo ${TIME} ${YELLOW}[WARN]${CNone}
ERR		= echo ${TIME} ${RED}[FAIL]${CNone}
OK		= echo ${TIME} ${GREEN}[ OK ]${CNone}
FAIL	= (echo ${TIME} ${RED}[FAIL]${CNone} && false)

References

• fluxcd helm chart Makefile
• Multiline bash in Makefile