bees: trace and log improvements during roots and context startup

Currently if crawl throws an exception, we don't have basic information
about what was being crawled or even if the crawler was running at all.

These traces also help identify the causes of early exception failures.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>

src/bees-roots.cc

@@ -233,6 +233,7 @@ size_t
 BeesRoots::crawl_batch(shared_ptr<BeesCrawl> this_crawl)
 {
 	BEESNOTE("Crawling batch " << this_crawl->get_state_begin());
+	BEESTRACE("Crawling batch " << this_crawl->get_state_begin());
 	auto ctx_copy = m_ctx;
 	size_t batch_count = 0;
 	auto subvol = this_crawl->get_state_begin().m_root;
@@ -709,6 +710,7 @@ BeesRoots::open_root(uint64_t rootid)
 bool
 BeesRoots::is_root_ro_nocache(uint64_t root)
 {
+	BEESTRACE("checking subvol flags on root " << root);
 	Fd root_fd = open_root(root);
 	BEESTRACE("checking subvol flags on root " << root << " path " << name_fd(root_fd));
 

src/bees.cc

@@ -734,6 +734,7 @@ bees_main(int argc, char *argv[])
 
 	// Create a context so we can apply configuration to it
 	shared_ptr<BeesContext> bc = make_shared<BeesContext>();
+	BEESLOGDEBUG("context constructed");
 
 	string cwd(readlink_or_die("/proc/self/cwd"));
 
@@ -789,6 +790,8 @@ bees_main(int argc, char *argv[])
 			break;
 		}
 
+		BEESLOGDEBUG("Parsing option '" << static_cast<char>(c) << "'");
+
 		switch (c) {
 
 			case 'C':