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build: turn COMMIT into a file dependency

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Makefile uses $(shell) to build a git commit string.  Unfortunately this
means make targets cannot be rebuilt when COMMIT changes value.  We need
to reflect this string value into files on which make can process
dependencies.

I stole a solution from QEMU's Makefile:
1. Print the string into .git-commit.tmp
2. If .git-commit.tmp differs from .git-commit, copy it to .git-commit
3. Depend on .git-commit from all targets that need $COMMIT

This way targets are only rebuilt if the commit string value actually
changes.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2019-04-17 11:21:29 +01:00
parent 0f7bb25cf7
commit 7949cd6ebc
2 changed files with 17 additions and 7 deletions
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2
.gitignore vendored
View File

@ -1,6 +1,8 @@
*.o
*.patch
*.swp
.git-commit
.git-commit.tmp
/cli/config/configuration-fc.toml
/cli/config/configuration-qemu.toml
/cli/config-generated.go

22
Makefile
View File

@ -182,8 +182,16 @@ SHIMV2_DIR = $(CLI_DIR)/$(SHIMV2)
SOURCES := $(shell find . 2>&1 | grep -E '.*\.(c|h|go)$$')
VERSION := ${shell cat ./VERSION}
COMMIT_NO := $(shell git rev-parse HEAD 2> /dev/null || true)
COMMIT := $(if $(shell git status --porcelain --untracked-files=no),${COMMIT_NO}-dirty,${COMMIT_NO})
# Targets that depend on .git-commit can use $(shell cat .git-commit) to get a
# git revision string. They will only be rebuilt if the revision string
# actually changes.
.PHONY: .git-commit.tmp
.git-commit: .git-commit.tmp
@cmp $< $@ >/dev/null 2>&1 || cp $< $@
.git-commit.tmp:
@echo -n "$$(git rev-parse HEAD 2>/dev/null)" >$@
@test -n "$$(git status --porcelain --untracked-files=no)" && echo -n "-dirty" >>$@ || true
# List of configuration files to build and install
CONFIGS =
@ -414,9 +422,9 @@ $(TARGET).coverage: $(SOURCES) $(GENERATED_FILES) $(MAKEFILE_LIST)
GENERATED_FILES += $(CONFIGS)
$(GENERATED_FILES): %: %.in $(MAKEFILE_LIST) VERSION
$(GENERATED_FILES): %: %.in $(MAKEFILE_LIST) VERSION .git-commit
$(QUIET_GENERATE)$(SED) \
-e "s|@COMMIT@|$(COMMIT)|g" \
-e "s|@COMMIT@|$(shell cat .git-commit)|g" \
-e "s|@VERSION@|$(VERSION)|g" \
-e "s|@CONFIG_QEMU_IN@|$(CONFIG_QEMU_IN)|g" \
-e "s|@CONFIG_FC_IN@|$(CONFIG_FC_IN)|g" \
@ -510,7 +518,7 @@ install-completions:
$(QUIET_INST)install --mode 0644 -D $(BASH_COMPLETIONS) $(DESTDIR)/$(BASH_COMPLETIONSDIR)/$(notdir $(BASH_COMPLETIONS));
clean:
$(QUIET_CLEAN)rm -f $(TARGET) $(SHIMV2) $(NETMON_TARGET) $(CONFIGS) $(GENERATED_GO_FILES) $(GENERATED_FILES)
$(QUIET_CLEAN)rm -f $(TARGET) $(SHIMV2) $(NETMON_TARGET) $(CONFIGS) $(GENERATED_FILES) .git-commit .git-commit.tmp
show-usage: show-header
@printf "• Overview:\n"
@ -549,8 +557,8 @@ show-variables:
"$(foreach v,$(sort $(USER_VARS)),$(shell printf "\\t$(v)='$($(v))'\\\n"))"
@printf "\n"
show-header:
@printf "%s - version %s (commit %s)\n\n" $(TARGET) $(VERSION) $(COMMIT)
show-header: .git-commit
@printf "%s - version %s (commit %s)\n\n" $(TARGET) $(VERSION) $(shell cat .git-commit)
show-arches: show-header
@printf "Supported architectures (possible values for ARCH variable):\n\n"