Improve the logged version string and add clboss-status "info"

The logged version now looks like:
plugin-clboss: clboss v0.13.2 (v0.13.2-rc1-3-g44832e2)

A new "info" chunk is added to clboss-status:
   "info": {
      "version": "v0.13.2",
      "git_commit_hash": "44832e2258069641a6149bdc90b7e5fc12219f77",
      "git_describe": "v0.13.2-rc1-3-g44832e2"
   },

.gitignore

@@ -36,3 +36,4 @@ auxdir
 test_*
 !test_*.cpp
 !test_*.c
+/commit_hash.h

Boss/Mod/Initiator.cpp

@@ -1,3 +1,4 @@
+#include"commit_hash.h"
 #include"Boss/Mod/Initiator.hpp"
 #include"Boss/Mod/Rpc.hpp"
 #include"Boss/Msg/CommandRequest.hpp"
@@ -7,6 +8,8 @@
 #include"Boss/Msg/Init.hpp"
 #include"Boss/Msg/ManifestOption.hpp"
 #include"Boss/Msg/Option.hpp"
+#include"Boss/Msg/ProvideStatus.hpp"
+#include"Boss/Msg/SolicitStatus.hpp"
 #include"Boss/Signer.hpp"
 #include"Boss/log.hpp"
 #include"Ev/ThreadPool.hpp"
@@ -144,6 +147,19 @@ public:
 	      {
 		assert(open_rpc_socket);
 
+		bus.subscribe< Msg::SolicitStatus
+			     >([this](Msg::SolicitStatus const&) {
+			auto info = Json::Out()
+				.start_object()
+				.field( "version", "v" + std::string(PACKAGE_VERSION) )
+				.field( "git_commit_hash", std::string(GIT_COMMIT_HASH) )
+				.field( "git_describe", std::string(GIT_DESCRIBE) )
+				.end_object()
+				;
+			return bus.raise(Msg::ProvideStatus{
+				"info", std::move(info)
+			});
+		});
 		bus.subscribe<Boss::Msg::CommandRequest>([this](Boss::Msg::CommandRequest const& c) {
 			if (c.command != "init")
 				return Ev::lift();
@@ -219,8 +235,10 @@ public:
 			}
 
 			return Boss::log( bus, Info
-					, "%s"
-					, PACKAGE_STRING
+					, "%s v%s (%s)"
+					, PACKAGE_NAME
+					, PACKAGE_VERSION
+					, GIT_DESCRIBE
 					)
 			     + std::move(pre_act)
 			/* Now construct the RPC socket.  */

Makefile.am

@@ -566,7 +566,9 @@ EXTRA_DIST = \
 	reproducible/README.md \
 	reproducible/build.sh \
 	reproducible/continue.sh \
-	reproducible/manifest.scm.template 
+	reproducible/manifest.scm.template \
+    generate_commit_hash.sh \
+    commit_hash.h
 
 AM_CXXFLAGS = -Wall -Werror $(PTHREAD_CFLAGS) $(libev_CFLAGS) $(SQLITE3_CFLAGS) $(CURL_CFLAGS) $(CLBOSS_CXXFLAGS)
 LDADD = libclboss.la $(PTHREAD_LIBS) $(libev_LIBS) $(SQLITE3_LIBS) $(CURL_LIBS)
@@ -668,3 +670,11 @@ CLEANFILES = $(noinst_SCRIPTS)
 create-tarball: create-tarball.in Makefile
 	sed -e 's/[@]PACKAGE_VERSION[@]/$(PACKAGE_VERSION)/' < $(srcdir)/create-tarball.in > create-tarball
 	chmod +x create-tarball
+
+BUILT_SOURCES = commit_hash.h
+CLEANFILES += commit_hash.h
+
+commit_hash.h:
+	./generate_commit_hash.sh
+
+clboss libclboss.la: $(BUILT_SOURCES)

generate_commit_hash.sh

@@ -0,0 +1,4 @@
+# generate_commit_hash.sh
+echo "#pragma once" > commit_hash.h
+echo "#define GIT_COMMIT_HASH \"$(git rev-parse HEAD)\"" >> commit_hash.h
+echo "#define GIT_DESCRIBE \"$(git describe --tags --long --always --match=v*.* --dirty)\"" >> commit_hash.h