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authorGravatar Yann E. MORIN <yann.morin.1998@free.fr>2019-04-15 21:47:31 +0200
committerGravatar Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>2019-04-15 23:37:44 +0200
commitf8177b78132698b39ae3c49a0ee2f1d6828f8324 (patch)
treec39d7685373280deeb0ccf0326268e484813b15f
parent2b35c71745d4e0ed5edd30e0a91f991a9c703569 (diff)
downloadbuildroot-f8177b78132698b39ae3c49a0ee2f1d6828f8324.tar.gz
buildroot-f8177b78132698b39ae3c49a0ee2f1d6828f8324.tar.bz2
core: introduce new global show-info
Users are increasingly trying to extract information about packages. For example, they might need to get the list of URIs, or the dependencies of a package. Although we do have a bunch of rules to generate some of that, this is done in ad-hoc way, with most of the output formats just ad-hoc, raw, unformatted blurbs, mostly internal data dumped as-is. Introduce a new rule, show-info, that provides a properly formatted output of all the meta-information about packages: name, type, version, licenses, dependencies... We choose to use JSON as the output format, because it is pretty versatile, has parsers in virtually all languages, has tools to parse from the shell (jq). It also closely matches Python data structure, which makes it easy to use with our own internal tools as well. Finally, JSON being a key-value store, allows for easy expanding the output without requiring existing consumers to be updated; new, unknown keys are simply ignored by those (as long as they are true JSON parsers). The complex part of this change was the conditional output of parts of the data: virtual packages have no source, version, license or downloads, unlike non-virtual packages. Same goes for filesystems. We use a wrapper macro, show-info, that de-multiplexes unto either the package-related- or filesystem-related macros, and for packages, we also use a detailed macro for non-virtual packages. It is non-trivial to properly output correct JSON blurbs, especially when trying to output an array of objects, like so, where the last item shall not be followed by a comma: [ { ... }, { ... } ] So, we use a trick (as sugegsted by Arnout), to $(subst) any pair of ",}" or ", }" or ",]" or ", ]" with only the respective closing symbol, "}" or "]". The whole stuff is $(strip)ed to make it a somewhat-minified JSON blurb that fits on a single line with all spaces squashed (but still with spaces, as it is not possible to differentiate spaces between JSON elements from spaces inside JSON strings). Reported-by: Thomas De Schampheleire <patrickdepinguin@gmail.com> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Thomas De Schampheleire <patrickdepinguin@gmail.com> Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com> Cc: Arnout Vandecappelle <arnout@mind.be> Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
-rw-r--r--Makefile16
-rw-r--r--package/pkg-utils.mk64
2 files changed, 80 insertions, 0 deletions
diff --git a/Makefile b/Makefile
index 60bf7d7d08..0f5331ec7e 100644
--- a/Makefile
+++ b/Makefile
@@ -903,6 +903,21 @@ check-dependencies:
@cd "$(CONFIG_DIR)"; \
$(TOPDIR)/support/scripts/graph-depends -C
+.PHONY: show-info
+show-info:
+ @:
+ $(info $(call clean-json, \
+ { $(foreach p, \
+ $(sort $(foreach i,$(PACKAGES) $(TARGETS_ROOTFS), \
+ $(i) \
+ $($(call UPPERCASE,$(i))_FINAL_RECURSIVE_DEPENDENCIES) \
+ ) \
+ ), \
+ $(call json-info,$(call UPPERCASE,$(p)))$(comma) \
+ ) } \
+ ) \
+ )
+
else # ifeq ($(BR2_HAVE_DOT_CONFIG),y)
# Some subdirectories are also package names. To avoid that "make linux"
@@ -1128,6 +1143,7 @@ help:
@echo ' source - download all sources needed for offline-build'
@echo ' external-deps - list external packages used'
@echo ' legal-info - generate info about license compliance'
+ @echo ' show-info - generate info about packages, as a JSON blurb'
@echo ' printvars - dump internal variables selected with VARS=...'
@echo
@echo ' make V=0|1 - 0 => quiet build (default), 1 => verbose build'
diff --git a/package/pkg-utils.mk b/package/pkg-utils.mk
index bffd79dfb0..b7280e930f 100644
--- a/package/pkg-utils.mk
+++ b/package/pkg-utils.mk
@@ -62,6 +62,70 @@ $$(error Package error: use $(2) instead of $(1). Please fix your .mk file)
endif
endef
+# json-info -- return package or filesystem metadata formatted as an entry
+# of a JSON dictionnary
+# $(1): upper-case package or filesystem name
+define json-info
+ "$($(1)_NAME)": {
+ "type": "$($(1)_TYPE)",
+ $(if $(filter rootfs,$($(1)_TYPE)), \
+ $(call _json-info-fs,$(1)), \
+ $(call _json-info-pkg,$(1)), \
+ )
+ }
+endef
+
+# _json-info-pkg, _json-info-pkg-details, _json-info-fs: private helpers
+# for json-info, above
+define _json-info-pkg
+ $(if $($(1)_IS_VIRTUAL), \
+ "virtual": true$(comma),
+ "virtual": false$(comma)
+ $(call _json-info-pkg-details,$(1)) \
+ )
+ "dependencies": [
+ $(call make-comma-list,$(sort $($(1)_FINAL_ALL_DEPENDENCIES)))
+ ],
+ "reverse_dependencies": [
+ $(call make-comma-list,$(sort $($(1)_RDEPENDENCIES)))
+ ]
+endef
+
+define _json-info-pkg-details
+ "version": "$($(1)_DL_VERSION)",
+ "licenses": "$($(1)_LICENSE)",
+ "downloads": [
+ $(foreach dl,$(sort $($(1)_ALL_DOWNLOADS)),
+ {
+ "source": "$(notdir $(dl))",
+ "uris": [
+ $(call make-comma-list,
+ $(subst \|,|,
+ $(call DOWNLOAD_URIS,$(dl),$(1))
+ )
+ )
+ ]
+ },
+ )
+ ],
+endef
+
+define _json-info-fs
+ "dependencies": [
+ $(call make-comma-list,$(sort $($(1)_DEPENDENCIES)))
+ ]
+endef
+
+# clean-json -- cleanup pseudo-json into clean json:
+# - remove commas before closing ] and }
+# - minify with $(strip)
+clean-json = $(strip \
+ $(subst $(comma)},}, $(subst $(comma)$(space)},$(space)}, \
+ $(subst $(comma)],], $(subst $(comma)$(space)],$(space)], \
+ $(strip $(1)) \
+ )))) \
+)
+
#
# legal-info helper functions
#