multi-pack-index: report progress during 'verify'

When verifying a multi-pack-index, the only action that takes
significant time is checking the object offsets. For example,
to verify a multi-pack-index containing 6.2 million objects in
the Linux kernel repository takes 1.3 seconds on my machine.
99% of that time is spent looking up object offsets in each of
the packfiles and comparing them to the multi-pack-index offset.

Add a progress indicator for that section of the 'verify' verb.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/midx.c b/midx.c
index ef4a6969df984fa95e7e9657a98577a6f484aeb8..713d6f9dde677d5418f5a4576c58e38646f90c58 100644 (file)
--- a/midx.c
+++ b/midx.c
@@ -7,6 +7,7 @@
 #include "object-store.h"
 #include "sha1-lookup.h"
 #include "midx.h"
+#include "progress.h"
 
 #define MIDX_SIGNATURE 0x4d494458 /* "MIDX" */
 #define MIDX_VERSION 1
@@ -940,6 +941,7 @@ static void midx_report(const char *fmt, ...)
 int verify_midx_file(const char *object_dir)
 {
        uint32_t i;
+       struct progress *progress = NULL;
        struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
        verify_midx_error = 0;
 
@@ -971,6 +973,7 @@ int verify_midx_file(const char *object_dir)
                                    i, oid_to_hex(&oid1), oid_to_hex(&oid2), i + 1);
        }
 
+       progress = start_progress(_("Verifying object offsets"), m->num_objects);
        for (i = 0; i < m->num_objects; i++) {
                struct object_id oid;
                struct pack_entry e;
@@ -995,7 +998,10 @@ int verify_midx_file(const char *object_dir)
                if (m_offset != p_offset)
                        midx_report(_("incorrect object offset for oid[%d] = %s: %"PRIx64" != %"PRIx64),
                                    i, oid_to_hex(&oid), m_offset, p_offset);
+
+               display_progress(progress, i + 1);
        }
+       stop_progress(&progress);
 
        return verify_midx_error;
 }