Only commit changed packages to master

Makefile

@@ -5,7 +5,7 @@ STABLE_TARGETS = $(shell hack/chart_destination.sh $(STABLE_CHARTS))
 STAGING_CHARTS = $(wildcard staging/*/Chart.yaml)
 STAGING_TARGETS = $(shell hack/chart_destination.sh $(STAGING_CHARTS))
 
-GIT_REMOTE_URL ?= https://mesosphere:$(GITHUB_USER_TOKEN)@github.com/mesosphere/charts.git
+GIT_REMOTE_URL ?= $(shell git remote get-url origin)
 
 # Extract the github user from the origin remote url.
 # This let's the 'publish' task work with forks.
@@ -14,8 +14,9 @@ GIT_REMOTE_URL ?= https://mesosphere:$(GITHUB_USER_TOKEN)@github.com/mesosphere/
 # - [email protected]:mesosphere/charts.git
 GITHUB_USER := $(shell git remote get-url origin | sed -E 's|.*github.com[/:]([^/]+)/charts.*|\1|')
 
-GIT_REF = $(shell git show-ref -s HEAD)	
-LAST_COMMIT_MESSAGE := $(shell git reflog -1 | sed 's/^.*: //')
+GIT_REF = $(shell git rev-parse HEAD)	
+LAST_COMMIT_MESSAGE := $(shell git log -1 --pretty=format:'%B')
+NON_DOCS_FILES := $(filter-out docs,$(wildcard *))
 
 TMPDIR := $(shell mktemp -d)
 HELM := $(shell bash -c "command -v helm")
@@ -52,14 +53,16 @@ stablerepo: $(STABLE_TARGETS) | docs/stable/index.yaml
 .PHONY: publish
 publish:
 	-git remote add publish $(GIT_REMOTE_URL) >/dev/null 2>&1
-	-@git branch -D master
-	@git checkout -b master
-	@curl -Ls https://github.com/mesosphere/charts/archive/master.tar.gz | tar -xz --strip-components=1 charts-master/docs
-	@make all
-	@git add .
-	@git commit -m "$(LAST_COMMIT_MESSAGE)"
-	@git push -f publish master
-	@git checkout -
+	-git branch -D master
+	git checkout -b master
+	git fetch publish master
+	git reset --hard publish/master
+	git checkout $(GIT_REF) -- $(NON_DOCS_FILES)
+	make all
+	git add -A .
+	git commit -m "$(LAST_COMMIT_MESSAGE)"
+	git push publish master
+	git checkout -
 
 $(HELM):
 ifeq ($(HELM),$(TMPDIR)/helm)
@@ -73,20 +76,21 @@ endif
 # - Untarring the package
 # - Recreate the package using `tar`, speficying time of the last git commit to the package
 #   source as the files' mtime, as well as ordering files deterministically, meaning that unchanged
-#   content will result in the same output package.
+#   content will result in the same output package
+# - Use `gzip -n` to prevent any timestamps being added to `gzip` headers in archive.
 $(STABLE_TARGETS) $(STAGING_TARGETS): $$(wildcard $$(patsubst docs/%.tgz,%/*,$$@)) $$(wildcard $$(patsubst docs/%.tgz,%/*/*,$$@))
 $(STABLE_TARGETS) $(STAGING_TARGETS): $(TMPDIR)/.helm/repository/local/index.yaml
 	@mkdir -p $(shell dirname $@)
 	$(eval PACKAGE_SRC := $(shell echo $@ | sed 's@docs/\(.*\)-[v0-9][0-9.]*.tgz@\1@'))
 	$(eval UNPACKED_TMP := $(shell mktemp -d))
 	$(HELM) --home $(TMPDIR)/.helm package $(PACKAGE_SRC) -d $(shell dirname $@)
 	tar -xzmf $@ -C $(UNPACKED_TMP)
-	tar -czf $@ \
-			--owner=root --group=root --numeric-owner \
+	tar -c \
+			--owner=root:0 --group=root:0 --numeric-owner \
 			--no-recursion \
 			--mtime="@$(shell git log -1 --format="%at" $(PACKAGE_SRC))" \
 			-C $(UNPACKED_TMP) \
-			$$(find $(UNPACKED_TMP) -printf '%P\n' | sort)
+			$$(find $(UNPACKED_TMP) -printf '%P\n' | sort) | gzip -n > $@
 	rm -rf $(UNPACKED_TMP)
 
 %/index.yaml: $(STABLE_TARGETS) $(STAGING_TARGETS)