[PATCH v8 13/15] bugreport: add packed object summary

[Emily Shaffer <emilyshaffer@google.com>]

Alongside the loose object counts, it can be useful to show the number
of packs and packed objects. This way we can check whether the repo has
an appropriate ratio of packed to loose objects to help determine
whether it's behaving correctly.

Add a utility to easily traverse all packfiles in a given repository.
Use it in packfile.c and remove a redundant call to
prepare_packed_git(), which is already called in get_all_packs().

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
---
 Documentation/git-bugreport.txt |  1 +
 bugreport.c                     | 30 ++++++++++++++++++++++++++++++
 object-store.h                  |  6 ++++++
 packfile.c                      |  3 +--
 4 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/Documentation/git-bugreport.txt b/Documentation/git-bugreport.txt
index 4fe1c60506..eb41f0677f 100644
--- a/Documentation/git-bugreport.txt
+++ b/Documentation/git-bugreport.txt
@@ -33,6 +33,7 @@ The following information is captured automatically:
  - Selected config values
  - A list of enabled hooks
  - The number of loose objects in the repository
+ - The number of packs and packed objects in the repository
 
 This tool is invoked via the typical Git setup process, which means that in some
 cases, it might not be able to launch - for example, if a relevant config file
diff --git a/bugreport.c b/bugreport.c
index fb7bc72723..71191f1331 100644
--- a/bugreport.c
+++ b/bugreport.c
@@ -177,6 +177,33 @@ static void get_loose_object_summary(struct strbuf *obj_info, int nongit) {
 		    total_count_questionable ? " (problem during count)" : "");
 }
 
+static void get_packed_object_summary(struct strbuf *obj_info, int nongit)
+{
+	struct packed_git *pack = NULL;
+	int pack_count = 0;
+	int object_count = 0;
+
+	if (nongit) {
+		strbuf_addstr(obj_info,
+			"not run from a git repository - no objects to show\n");
+		return;
+	}
+
+	for_each_pack(the_repository, pack) {
+		pack_count++;
+		/*
+		 * To accurately count how many objects are packed, look inside
+		 * the packfile's index.
+		 */
+		open_pack_index(pack);
+		object_count += pack->num_objects;
+	}
+
+	strbuf_addf(obj_info, "%d total packs (%d objects)\n", pack_count,
+		    object_count);
+
+}
+
 static const char * const bugreport_usage[] = {
 	N_("git bugreport [-o|--output-directory <file>] [-s|--suffix <format>]"),
 	NULL
@@ -271,6 +298,9 @@ int cmd_main(int argc, const char **argv)
 	get_header(&buffer, "Loose Object Counts");
 	get_loose_object_summary(&buffer, nongit_ok);
 
+	get_header(&buffer, "Packed Object Summary");
+	get_packed_object_summary(&buffer, nongit_ok);
+
 	report = fopen_for_writing(report_path.buf);
 
 	if (report == NULL) {
diff --git a/object-store.h b/object-store.h
index 5b047637e3..f881a1756e 100644
--- a/object-store.h
+++ b/object-store.h
@@ -7,6 +7,7 @@
 #include "sha1-array.h"
 #include "strbuf.h"
 #include "thread-utils.h"
+#include "packfile.h"
 
 struct object_directory {
 	struct object_directory *next;
@@ -447,4 +448,9 @@ int for_each_object_in_pack(struct packed_git *p,
 int for_each_packed_object(each_packed_object_fn, void *,
 			   enum for_each_object_flags flags);
 
+#define for_each_pack(repo, pack) 		\
+		for (pack = get_all_packs(repo);\
+		     pack;			\
+		     pack = pack->next)
+
 #endif /* OBJECT_STORE_H */
diff --git a/packfile.c b/packfile.c
index 99dd1a7d09..95afcc1187 100644
--- a/packfile.c
+++ b/packfile.c
@@ -2095,8 +2095,7 @@ int for_each_packed_object(each_packed_object_fn cb, void *data,
 	int r = 0;
 	int pack_errors = 0;
 
-	prepare_packed_git(the_repository);
-	for (p = get_all_packs(the_repository); p; p = p->next) {
+	for_each_pack(the_repository, p) {
 		if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
 			continue;
 		if ((flags & FOR_EACH_OBJECT_PROMISOR_ONLY) &&
-- 
2.25.0.265.gbab2e86ba0-goog