[chore] Improve the Makefile to make it more robust to other environments. (#1063)

Makefile

@@ -16,6 +16,17 @@ CHLOGGEN_CONFIG  := .chloggen/config.yaml
 SEMCONVGEN_VERSION=0.24.0
 WEAVER_VERSION=0.2.0
 
+# From where to resolve the containers (e.g. "otel/weaver").
+CONTAINER_REPOSITORY=docker.io
+
+# Per container overrides for the repository resolution.
+WEAVER_CONTAINER_REPOSITORY=$(CONTAINER_REPOSITORY)
+SEMCONVGEN_CONTAINER_REPOSITORY=$(CONTAINER_REPOSITORY)
+
+# Fully qualified references to containers used in this Makefile.
+WEAVER_CONTAINER=$(WEAVER_CONTAINER_REPOSITORY)/otel/weaver:$(WEAVER_VERSION)
+SEMCONVGEN_CONTAINER=$(SEMCONVGEN_CONTAINER_REPOSITORY)/otel/semconvgen:$(SEMCONVGEN_VERSION)
+
 # TODO: add `yamllint` step to `all` after making sure it works on Mac.
 .PHONY: all
 all: install-tools markdownlint markdown-link-check misspell table-check compatibility-check schema-check \
@@ -96,7 +107,7 @@ yamllint:
 .PHONY: table-generation
 table-generation:
 	docker run --rm -v $(PWD)/model:/source -v $(PWD)/docs:/spec -v $(PWD)/templates:/weaver/templates \
-		otel/weaver:${WEAVER_VERSION} registry update-markdown \
+		$(WEAVER_CONTAINER) registry update-markdown \
 		--registry=/source \
 		--attribute-registry-base-url=/docs/attributes-registry \
 		--templates=/weaver/templates \
@@ -107,7 +118,7 @@ table-generation:
 .PHONY: attribute-registry-generation
 attribute-registry-generation:
 	docker run --rm -v $(PWD)/model:/source -v $(PWD)/docs:/spec -v $(PWD)/templates:/weaver/templates \
-		otel/weaver:${WEAVER_VERSION} registry generate \
+		$(WEAVER_CONTAINER) registry generate \
 		  --registry=/source \
 		  --templates=/weaver/templates \
 		  markdown \
@@ -118,7 +129,7 @@ attribute-registry-generation:
 .PHONY: table-check
 table-check:
 	docker run --rm -v $(PWD)/model:/source -v $(PWD)/docs:/spec -v $(PWD)/templates:/weaver/templates \
-		otel/weaver:${WEAVER_VERSION} registry update-markdown \
+		$(WEAVER_CONTAINER) registry update-markdown \
 		--registry=/source \
 		--attribute-registry-base-url=/docs/attributes-registry \
 		--templates=/weaver/templates \
@@ -126,11 +137,25 @@ table-check:
 		--dry-run \
 		/spec
 
-LATEST_RELEASED_SEMCONV_VERSION := $(shell git describe --tags --abbrev=0 | sed 's/v//g')
+
+# A previous iteration of calculating "LATEST_RELEASED_SEMCONV_VERSION"
+# relied on "git describe". However, that approach does not work with
+# light-weight developer forks/branches that haven't synced tags. Hence the
+# more complex implementation of this using "git ls-remote".
+#
+# The output of "git ls-remote" looks something like this:
+#
+#    e531541025992b68177a68b87628c5dc75c4f7d9        refs/tags/v1.21.0
+#    cadfe53949266d33476b15ca52c92f682600a29c        refs/tags/v1.22.0
+#    ...
+#
+# .. which is why some additional processing is required to extract the
+# latest version number and strip off the "v" prefix.
+LATEST_RELEASED_SEMCONV_VERSION := $(shell git ls-remote --tags https://github.com/open-telemetry/semantic-conventions.git | cut -f 2 | sort --reverse | head -n 1 | tr '/' ' ' | cut -d ' ' -f 3 | sed 's/v//g')
 .PHONY: compatibility-check
 compatibility-check:
 	docker run --rm -v $(PWD)/model:/source -v $(PWD)/docs:/spec --pull=always \
-		otel/semconvgen:$(SEMCONVGEN_VERSION) -f /source compatibility --previous-version $(LATEST_RELEASED_SEMCONV_VERSION)
+		$(SEMCONVGEN_CONTAINER) -f /source compatibility --previous-version $(LATEST_RELEASED_SEMCONV_VERSION)
 
 .PHONY: schema-check
 schema-check: