[PATCH v4 23/23] midx: clear midx on repack

[Derrick Stolee]

If a 'git repack' command replaces existing packfiles, then we must
clear the existing multi-pack-index before moving the packfiles it
references.

Signed-off-by: Derrick Stolee <dsto...@microsoft.com>
---
 builtin/repack.c            |  9 +++++++++
 midx.c                      | 12 ++++++++++++
 midx.h                      |  1 +
 t/t5319-multi-pack-index.sh |  9 +++++++++
 4 files changed, 31 insertions(+)

diff --git a/builtin/repack.c b/builtin/repack.c
index 6c636e159e..7f7cdc8b17 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -8,6 +8,7 @@
 #include "strbuf.h"
 #include "string-list.h"
 #include "argv-array.h"
+#include "midx.h"
 
 static int delta_base_offset = 1;
 static int pack_kept_objects = -1;
@@ -174,6 +175,7 @@ int cmd_repack(int argc, const char **argv, const char 
*prefix)
        int no_update_server_info = 0;
        int quiet = 0;
        int local = 0;
+       int midx_cleared = 0;
 
        struct option builtin_repack_options[] = {
                OPT_BIT('a', NULL, &pack_everything,
@@ -333,6 +335,13 @@ int cmd_repack(int argc, const char **argv, const char 
*prefix)
        for_each_string_list_item(item, &names) {
                for (ext = 0; ext < ARRAY_SIZE(exts); ext++) {
                        char *fname, *fname_old;
+
+                       if (!midx_cleared) {
+                               /* if we move a packfile, it will invalidated 
the midx */
+                               clear_midx_file(get_object_directory());
+                               midx_cleared = 1;
+                       }
+
                        fname = mkpathdup("%s/pack-%s%s", packdir,
                                                item->string, exts[ext].name);
                        if (!file_exists(fname)) {
diff --git a/midx.c b/midx.c
index bf2334acc6..19b7df338e 100644
--- a/midx.c
+++ b/midx.c
@@ -904,3 +904,15 @@ int write_midx_file(const char *object_dir)
        free(midx_name);
        return 0;
 }
+
+void clear_midx_file(const char *object_dir)
+{
+       char *midx = get_midx_filename(object_dir);
+
+       if (remove_path(midx)) {
+               UNLEAK(midx);
+               die(_("failed to clear multi-pack-index at %s"), midx);
+       }
+
+       free(midx);
+}
diff --git a/midx.h b/midx.h
index d4cde99473..e3b07f1586 100644
--- a/midx.h
+++ b/midx.h
@@ -39,5 +39,6 @@ int midx_contains_pack(struct multi_pack_index *m, const char 
*idx_name);
 int prepare_multi_pack_index_one(struct repository *r, const char *object_dir);
 
 int write_midx_file(const char *object_dir);
+void clear_midx_file(const char *object_dir);
 
 #endif
diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh
index 601e28a2f0..5ad6614465 100755
--- a/t/t5319-multi-pack-index.sh
+++ b/t/t5319-multi-pack-index.sh
@@ -141,6 +141,15 @@ test_expect_success 'write midx with twelve packs' '
 
 compare_results_with_midx "twelve packs"
 
+test_expect_success 'repack removes multi-pack-index' '
+       test_path_is_file $objdir/pack/multi-pack-index &&
+       git repack -adf &&
+       test_path_is_missing $objdir/pack/multi-pack-index
+'
+
+compare_results_with_midx "after repack"
+
+
 # usage: corrupt_data <file> <pos> [<data>]
 corrupt_data () {
        file=$1
-- 
2.18.0.118.gd4f65b8d14