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midx-write.c
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#define USE_THE_REPOSITORY_VARIABLE
#include "git-compat-util.h"
#include "abspath.h"
#include "config.h"
#include "hex.h"
#include "lockfile.h"
#include "packfile.h"
#include "object-file.h"
#include "hash-lookup.h"
#include "midx.h"
#include "progress.h"
#include "trace2.h"
#include "run-command.h"
#include "chunk-format.h"
#include "pack-bitmap.h"
#include "refs.h"
#include "revision.h"
#include "list-objects.h"
#include "path.h"
#include "pack-revindex.h"
#define PACK_EXPIRED UINT_MAX
#define BITMAP_POS_UNKNOWN (~((uint32_t)0))
#define MIDX_CHUNK_FANOUT_SIZE (sizeof(uint32_t) * 256)
#define MIDX_CHUNK_LARGE_OFFSET_WIDTH (sizeof(uint64_t))
extern int midx_checksum_valid(struct multi_pack_index *m);
extern void clear_midx_files_ext(const char *object_dir, const char *ext,
const char *keep_hash);
extern void clear_incremental_midx_files_ext(const char *object_dir,
const char *ext,
const char **keep_hashes,
uint32_t hashes_nr);
extern int cmp_idx_or_pack_name(const char *idx_or_pack_name,
const char *idx_name);
static size_t write_midx_header(struct hashfile *f,
unsigned char num_chunks,
uint32_t num_packs)
{
hashwrite_be32(f, MIDX_SIGNATURE);
hashwrite_u8(f, MIDX_VERSION);
hashwrite_u8(f, oid_version(the_hash_algo));
hashwrite_u8(f, num_chunks);
hashwrite_u8(f, 0); /* unused */
hashwrite_be32(f, num_packs);
return MIDX_HEADER_SIZE;
}
struct pack_info {
uint32_t orig_pack_int_id;
char *pack_name;
struct packed_git *p;
uint32_t bitmap_pos;
uint32_t bitmap_nr;
unsigned expired : 1;
};
static void fill_pack_info(struct pack_info *info,
struct packed_git *p, const char *pack_name,
uint32_t orig_pack_int_id)
{
memset(info, 0, sizeof(struct pack_info));
info->orig_pack_int_id = orig_pack_int_id;
info->pack_name = xstrdup(pack_name);
info->p = p;
info->bitmap_pos = BITMAP_POS_UNKNOWN;
}
static int pack_info_compare(const void *_a, const void *_b)
{
struct pack_info *a = (struct pack_info *)_a;
struct pack_info *b = (struct pack_info *)_b;
return strcmp(a->pack_name, b->pack_name);
}
static int idx_or_pack_name_cmp(const void *_va, const void *_vb)
{
const char *pack_name = _va;
const struct pack_info *compar = _vb;
return cmp_idx_or_pack_name(pack_name, compar->pack_name);
}
struct write_midx_context {
struct pack_info *info;
size_t nr;
size_t alloc;
struct multi_pack_index *m;
struct multi_pack_index *base_midx;
struct progress *progress;
unsigned pack_paths_checked;
struct pack_midx_entry *entries;
size_t entries_nr;
uint32_t *pack_perm;
uint32_t *pack_order;
unsigned large_offsets_needed:1;
uint32_t num_large_offsets;
int preferred_pack_idx;
int incremental;
uint32_t num_multi_pack_indexes_before;
struct string_list *to_include;
};
static int should_include_pack(const struct write_midx_context *ctx,
const char *file_name)
{
/*
* Note that at most one of ctx->m and ctx->to_include are set,
* so we are testing midx_contains_pack() and
* string_list_has_string() independently (guarded by the
* appropriate NULL checks).
*
* We could support passing to_include while reusing an existing
* MIDX, but don't currently since the reuse process drags
* forward all packs from an existing MIDX (without checking
* whether or not they appear in the to_include list).
*
* If we added support for that, these next two conditional
* should be performed independently (likely checking
* to_include before the existing MIDX).
*/
if (ctx->m && midx_contains_pack(ctx->m, file_name))
return 0;
else if (ctx->base_midx && midx_contains_pack(ctx->base_midx,
file_name))
return 0;
else if (ctx->to_include &&
!string_list_has_string(ctx->to_include, file_name))
return 0;
return 1;
}
static void add_pack_to_midx(const char *full_path, size_t full_path_len,
const char *file_name, void *data)
{
struct write_midx_context *ctx = data;
struct packed_git *p;
if (ends_with(file_name, ".idx")) {
display_progress(ctx->progress, ++ctx->pack_paths_checked);
if (!should_include_pack(ctx, file_name))
return;
ALLOC_GROW(ctx->info, ctx->nr + 1, ctx->alloc);
p = add_packed_git(full_path, full_path_len, 0);
if (!p) {
warning(_("failed to add packfile '%s'"),
full_path);
return;
}
if (open_pack_index(p)) {
warning(_("failed to open pack-index '%s'"),
full_path);
close_pack(p);
free(p);
return;
}
fill_pack_info(&ctx->info[ctx->nr], p, file_name, ctx->nr);
ctx->nr++;
}
}
struct pack_midx_entry {
struct object_id oid;
uint32_t pack_int_id;
time_t pack_mtime;
uint64_t offset;
unsigned preferred : 1;
};
static int midx_oid_compare(const void *_a, const void *_b)
{
const struct pack_midx_entry *a = (const struct pack_midx_entry *)_a;
const struct pack_midx_entry *b = (const struct pack_midx_entry *)_b;
int cmp = oidcmp(&a->oid, &b->oid);
if (cmp)
return cmp;
/* Sort objects in a preferred pack first when multiple copies exist. */
if (a->preferred > b->preferred)
return -1;
if (a->preferred < b->preferred)
return 1;
if (a->pack_mtime > b->pack_mtime)
return -1;
else if (a->pack_mtime < b->pack_mtime)
return 1;
return a->pack_int_id - b->pack_int_id;
}
static int nth_midxed_pack_midx_entry(struct multi_pack_index *m,
struct pack_midx_entry *e,
uint32_t pos)
{
if (pos >= m->num_objects + m->num_objects_in_base)
return 1;
nth_midxed_object_oid(&e->oid, m, pos);
e->pack_int_id = nth_midxed_pack_int_id(m, pos);
e->offset = nth_midxed_offset(m, pos);
/* consider objects in midx to be from "old" packs */
e->pack_mtime = 0;
return 0;
}
static void fill_pack_entry(uint32_t pack_int_id,
struct packed_git *p,
uint32_t cur_object,
struct pack_midx_entry *entry,
int preferred)
{
if (nth_packed_object_id(&entry->oid, p, cur_object) < 0)
die(_("failed to locate object %d in packfile"), cur_object);
entry->pack_int_id = pack_int_id;
entry->pack_mtime = p->mtime;
entry->offset = nth_packed_object_offset(p, cur_object);
entry->preferred = !!preferred;
}
struct midx_fanout {
struct pack_midx_entry *entries;
size_t nr, alloc;
};
static void midx_fanout_grow(struct midx_fanout *fanout, size_t nr)
{
if (nr < fanout->nr)
BUG("negative growth in midx_fanout_grow() (%"PRIuMAX" < %"PRIuMAX")",
(uintmax_t)nr, (uintmax_t)fanout->nr);
ALLOC_GROW(fanout->entries, nr, fanout->alloc);
}
static void midx_fanout_sort(struct midx_fanout *fanout)
{
QSORT(fanout->entries, fanout->nr, midx_oid_compare);
}
static void midx_fanout_add_midx_fanout(struct midx_fanout *fanout,
struct multi_pack_index *m,
uint32_t cur_fanout,
int preferred_pack)
{
uint32_t start = m->num_objects_in_base, end;
uint32_t cur_object;
if (m->base_midx)
midx_fanout_add_midx_fanout(fanout, m->base_midx, cur_fanout,
preferred_pack);
if (cur_fanout)
start += ntohl(m->chunk_oid_fanout[cur_fanout - 1]);
end = m->num_objects_in_base + ntohl(m->chunk_oid_fanout[cur_fanout]);
for (cur_object = start; cur_object < end; cur_object++) {
if ((preferred_pack > -1) &&
(preferred_pack == nth_midxed_pack_int_id(m, cur_object))) {
/*
* Objects from preferred packs are added
* separately.
*/
continue;
}
midx_fanout_grow(fanout, fanout->nr + 1);
nth_midxed_pack_midx_entry(m,
&fanout->entries[fanout->nr],
cur_object);
fanout->entries[fanout->nr].preferred = 0;
fanout->nr++;
}
}
static void midx_fanout_add_pack_fanout(struct midx_fanout *fanout,
struct pack_info *info,
uint32_t cur_pack,
int preferred,
uint32_t cur_fanout)
{
struct packed_git *pack = info[cur_pack].p;
uint32_t start = 0, end;
uint32_t cur_object;
if (cur_fanout)
start = get_pack_fanout(pack, cur_fanout - 1);
end = get_pack_fanout(pack, cur_fanout);
for (cur_object = start; cur_object < end; cur_object++) {
midx_fanout_grow(fanout, fanout->nr + 1);
fill_pack_entry(cur_pack,
info[cur_pack].p,
cur_object,
&fanout->entries[fanout->nr],
preferred);
fanout->nr++;
}
}
/*
* It is possible to artificially get into a state where there are many
* duplicate copies of objects. That can create high memory pressure if
* we are to create a list of all objects before de-duplication. To reduce
* this memory pressure without a significant performance drop, automatically
* group objects by the first byte of their object id. Use the IDX fanout
* tables to group the data, copy to a local array, then sort.
*
* Copy only the de-duplicated entries (selected by most-recent modified time
* of a packfile containing the object).
*/
static void compute_sorted_entries(struct write_midx_context *ctx,
uint32_t start_pack)
{
uint32_t cur_fanout, cur_pack, cur_object;
size_t alloc_objects, total_objects = 0;
struct midx_fanout fanout = { 0 };
for (cur_pack = start_pack; cur_pack < ctx->nr; cur_pack++)
total_objects = st_add(total_objects,
ctx->info[cur_pack].p->num_objects);
/*
* As we de-duplicate by fanout value, we expect the fanout
* slices to be evenly distributed, with some noise. Hence,
* allocate slightly more than one 256th.
*/
alloc_objects = fanout.alloc = total_objects > 3200 ? total_objects / 200 : 16;
ALLOC_ARRAY(fanout.entries, fanout.alloc);
ALLOC_ARRAY(ctx->entries, alloc_objects);
ctx->entries_nr = 0;
for (cur_fanout = 0; cur_fanout < 256; cur_fanout++) {
fanout.nr = 0;
if (ctx->m && !ctx->incremental)
midx_fanout_add_midx_fanout(&fanout, ctx->m, cur_fanout,
ctx->preferred_pack_idx);
for (cur_pack = start_pack; cur_pack < ctx->nr; cur_pack++) {
int preferred = cur_pack == ctx->preferred_pack_idx;
midx_fanout_add_pack_fanout(&fanout,
ctx->info, cur_pack,
preferred, cur_fanout);
}
if (-1 < ctx->preferred_pack_idx && ctx->preferred_pack_idx < start_pack)
midx_fanout_add_pack_fanout(&fanout, ctx->info,
ctx->preferred_pack_idx, 1,
cur_fanout);
midx_fanout_sort(&fanout);
/*
* The batch is now sorted by OID and then mtime (descending).
* Take only the first duplicate.
*/
for (cur_object = 0; cur_object < fanout.nr; cur_object++) {
if (cur_object && oideq(&fanout.entries[cur_object - 1].oid,
&fanout.entries[cur_object].oid))
continue;
if (ctx->incremental && ctx->base_midx &&
midx_has_oid(ctx->base_midx,
&fanout.entries[cur_object].oid))
continue;
ALLOC_GROW(ctx->entries, st_add(ctx->entries_nr, 1),
alloc_objects);
memcpy(&ctx->entries[ctx->entries_nr],
&fanout.entries[cur_object],
sizeof(struct pack_midx_entry));
ctx->entries_nr++;
}
}
free(fanout.entries);
}
static int write_midx_pack_names(struct hashfile *f, void *data)
{
struct write_midx_context *ctx = data;
uint32_t i;
unsigned char padding[MIDX_CHUNK_ALIGNMENT];
size_t written = 0;
for (i = 0; i < ctx->nr; i++) {
size_t writelen;
if (ctx->info[i].expired)
continue;
if (i && strcmp(ctx->info[i].pack_name, ctx->info[i - 1].pack_name) <= 0)
BUG("incorrect pack-file order: %s before %s",
ctx->info[i - 1].pack_name,
ctx->info[i].pack_name);
writelen = strlen(ctx->info[i].pack_name) + 1;
hashwrite(f, ctx->info[i].pack_name, writelen);
written += writelen;
}
/* add padding to be aligned */
i = MIDX_CHUNK_ALIGNMENT - (written % MIDX_CHUNK_ALIGNMENT);
if (i < MIDX_CHUNK_ALIGNMENT) {
memset(padding, 0, sizeof(padding));
hashwrite(f, padding, i);
}
return 0;
}
static int write_midx_bitmapped_packs(struct hashfile *f, void *data)
{
struct write_midx_context *ctx = data;
size_t i;
for (i = 0; i < ctx->nr; i++) {
struct pack_info *pack = &ctx->info[i];
if (pack->expired)
continue;
if (pack->bitmap_pos == BITMAP_POS_UNKNOWN && pack->bitmap_nr)
BUG("pack '%s' has no bitmap position, but has %d bitmapped object(s)",
pack->pack_name, pack->bitmap_nr);
hashwrite_be32(f, pack->bitmap_pos);
hashwrite_be32(f, pack->bitmap_nr);
}
return 0;
}
static int write_midx_oid_fanout(struct hashfile *f,
void *data)
{
struct write_midx_context *ctx = data;
struct pack_midx_entry *list = ctx->entries;
struct pack_midx_entry *last = ctx->entries + ctx->entries_nr;
uint32_t count = 0;
uint32_t i;
/*
* Write the first-level table (the list is sorted,
* but we use a 256-entry lookup to be able to avoid
* having to do eight extra binary search iterations).
*/
for (i = 0; i < 256; i++) {
struct pack_midx_entry *next = list;
while (next < last && next->oid.hash[0] == i) {
count++;
next++;
}
hashwrite_be32(f, count);
list = next;
}
return 0;
}
static int write_midx_oid_lookup(struct hashfile *f,
void *data)
{
struct write_midx_context *ctx = data;
unsigned char hash_len = the_hash_algo->rawsz;
struct pack_midx_entry *list = ctx->entries;
uint32_t i;
for (i = 0; i < ctx->entries_nr; i++) {
struct pack_midx_entry *obj = list++;
if (i < ctx->entries_nr - 1) {
struct pack_midx_entry *next = list;
if (oidcmp(&obj->oid, &next->oid) >= 0)
BUG("OIDs not in order: %s >= %s",
oid_to_hex(&obj->oid),
oid_to_hex(&next->oid));
}
hashwrite(f, obj->oid.hash, (int)hash_len);
}
return 0;
}
static int write_midx_object_offsets(struct hashfile *f,
void *data)
{
struct write_midx_context *ctx = data;
struct pack_midx_entry *list = ctx->entries;
uint32_t i, nr_large_offset = 0;
for (i = 0; i < ctx->entries_nr; i++) {
struct pack_midx_entry *obj = list++;
if (ctx->pack_perm[obj->pack_int_id] == PACK_EXPIRED)
BUG("object %s is in an expired pack with int-id %d",
oid_to_hex(&obj->oid),
obj->pack_int_id);
hashwrite_be32(f, ctx->pack_perm[obj->pack_int_id]);
if (ctx->large_offsets_needed && obj->offset >> 31)
hashwrite_be32(f, MIDX_LARGE_OFFSET_NEEDED | nr_large_offset++);
else if (!ctx->large_offsets_needed && obj->offset >> 32)
BUG("object %s requires a large offset (%"PRIx64") but the MIDX is not writing large offsets!",
oid_to_hex(&obj->oid),
obj->offset);
else
hashwrite_be32(f, (uint32_t)obj->offset);
}
return 0;
}
static int write_midx_large_offsets(struct hashfile *f,
void *data)
{
struct write_midx_context *ctx = data;
struct pack_midx_entry *list = ctx->entries;
struct pack_midx_entry *end = ctx->entries + ctx->entries_nr;
uint32_t nr_large_offset = ctx->num_large_offsets;
while (nr_large_offset) {
struct pack_midx_entry *obj;
uint64_t offset;
if (list >= end)
BUG("too many large-offset objects");
obj = list++;
offset = obj->offset;
if (!(offset >> 31))
continue;
hashwrite_be64(f, offset);
nr_large_offset--;
}
return 0;
}
static int write_midx_revindex(struct hashfile *f,
void *data)
{
struct write_midx_context *ctx = data;
uint32_t i, nr_base;
if (ctx->incremental && ctx->base_midx)
nr_base = ctx->base_midx->num_objects +
ctx->base_midx->num_objects_in_base;
else
nr_base = 0;
for (i = 0; i < ctx->entries_nr; i++)
hashwrite_be32(f, ctx->pack_order[i] + nr_base);
return 0;
}
struct midx_pack_order_data {
uint32_t nr;
uint32_t pack;
off_t offset;
};
static int midx_pack_order_cmp(const void *va, const void *vb)
{
const struct midx_pack_order_data *a = va, *b = vb;
if (a->pack < b->pack)
return -1;
else if (a->pack > b->pack)
return 1;
else if (a->offset < b->offset)
return -1;
else if (a->offset > b->offset)
return 1;
else
return 0;
}
static uint32_t *midx_pack_order(struct write_midx_context *ctx)
{
struct midx_pack_order_data *data;
uint32_t *pack_order, base_objects = 0;
uint32_t i;
trace2_region_enter("midx", "midx_pack_order", the_repository);
if (ctx->incremental && ctx->base_midx)
base_objects = ctx->base_midx->num_objects +
ctx->base_midx->num_objects_in_base;
ALLOC_ARRAY(pack_order, ctx->entries_nr);
ALLOC_ARRAY(data, ctx->entries_nr);
for (i = 0; i < ctx->entries_nr; i++) {
struct pack_midx_entry *e = &ctx->entries[i];
data[i].nr = i;
data[i].pack = ctx->pack_perm[e->pack_int_id];
if (!e->preferred)
data[i].pack |= (1U << 31);
data[i].offset = e->offset;
}
QSORT(data, ctx->entries_nr, midx_pack_order_cmp);
for (i = 0; i < ctx->entries_nr; i++) {
struct pack_midx_entry *e = &ctx->entries[data[i].nr];
struct pack_info *pack = &ctx->info[ctx->pack_perm[e->pack_int_id]];
if (pack->bitmap_pos == BITMAP_POS_UNKNOWN)
pack->bitmap_pos = i + base_objects;
pack->bitmap_nr++;
pack_order[i] = data[i].nr;
}
for (i = 0; i < ctx->nr; i++) {
struct pack_info *pack = &ctx->info[ctx->pack_perm[i]];
if (pack->bitmap_pos == BITMAP_POS_UNKNOWN)
pack->bitmap_pos = 0;
}
free(data);
trace2_region_leave("midx", "midx_pack_order", the_repository);
return pack_order;
}
static void write_midx_reverse_index(char *midx_name, unsigned char *midx_hash,
struct write_midx_context *ctx)
{
struct strbuf buf = STRBUF_INIT;
char *tmp_file;
trace2_region_enter("midx", "write_midx_reverse_index", the_repository);
strbuf_addf(&buf, "%s-%s.rev", midx_name, hash_to_hex(midx_hash));
tmp_file = write_rev_file_order(NULL, ctx->pack_order, ctx->entries_nr,
midx_hash, WRITE_REV);
if (finalize_object_file(tmp_file, buf.buf))
die(_("cannot store reverse index file"));
strbuf_release(&buf);
free(tmp_file);
trace2_region_leave("midx", "write_midx_reverse_index", the_repository);
}
static void prepare_midx_packing_data(struct packing_data *pdata,
struct write_midx_context *ctx)
{
uint32_t i;
trace2_region_enter("midx", "prepare_midx_packing_data", the_repository);
memset(pdata, 0, sizeof(struct packing_data));
prepare_packing_data(the_repository, pdata);
for (i = 0; i < ctx->entries_nr; i++) {
uint32_t pos = ctx->pack_order[i];
struct pack_midx_entry *from = &ctx->entries[pos];
struct object_entry *to = packlist_alloc(pdata, &from->oid);
oe_set_in_pack(pdata, to,
ctx->info[ctx->pack_perm[from->pack_int_id]].p);
}
trace2_region_leave("midx", "prepare_midx_packing_data", the_repository);
}
static int add_ref_to_pending(const char *refname, const char *referent UNUSED,
const struct object_id *oid,
int flag, void *cb_data)
{
struct rev_info *revs = (struct rev_info*)cb_data;
struct object_id peeled;
struct object *object;
if ((flag & REF_ISSYMREF) && (flag & REF_ISBROKEN)) {
warning("symbolic ref is dangling: %s", refname);
return 0;
}
if (!peel_iterated_oid(the_repository, oid, &peeled))
oid = &peeled;
object = parse_object_or_die(oid, refname);
if (object->type != OBJ_COMMIT)
return 0;
add_pending_object(revs, object, "");
if (bitmap_is_preferred_refname(revs->repo, refname))
object->flags |= NEEDS_BITMAP;
return 0;
}
struct bitmap_commit_cb {
struct commit **commits;
size_t commits_nr, commits_alloc;
struct write_midx_context *ctx;
};
static const struct object_id *bitmap_oid_access(size_t index,
const void *_entries)
{
const struct pack_midx_entry *entries = _entries;
return &entries[index].oid;
}
static void bitmap_show_commit(struct commit *commit, void *_data)
{
struct bitmap_commit_cb *data = _data;
int pos = oid_pos(&commit->object.oid, data->ctx->entries,
data->ctx->entries_nr,
bitmap_oid_access);
if (pos < 0)
return;
ALLOC_GROW(data->commits, data->commits_nr + 1, data->commits_alloc);
data->commits[data->commits_nr++] = commit;
}
static int read_refs_snapshot(const char *refs_snapshot,
struct rev_info *revs)
{
struct strbuf buf = STRBUF_INIT;
struct object_id oid;
FILE *f = xfopen(refs_snapshot, "r");
while (strbuf_getline(&buf, f) != EOF) {
struct object *object;
int preferred = 0;
char *hex = buf.buf;
const char *end = NULL;
if (buf.len && *buf.buf == '+') {
preferred = 1;
hex = &buf.buf[1];
}
if (parse_oid_hex(hex, &oid, &end) < 0)
die(_("could not parse line: %s"), buf.buf);
if (*end)
die(_("malformed line: %s"), buf.buf);
object = parse_object_or_die(&oid, NULL);
if (preferred)
object->flags |= NEEDS_BITMAP;
add_pending_object(revs, object, "");
}
fclose(f);
strbuf_release(&buf);
return 0;
}
static struct commit **find_commits_for_midx_bitmap(uint32_t *indexed_commits_nr_p,
const char *refs_snapshot,
struct write_midx_context *ctx)
{
struct rev_info revs;
struct bitmap_commit_cb cb = {0};
trace2_region_enter("midx", "find_commits_for_midx_bitmap",
the_repository);
cb.ctx = ctx;
repo_init_revisions(the_repository, &revs, NULL);
if (refs_snapshot) {
read_refs_snapshot(refs_snapshot, &revs);
} else {
setup_revisions(0, NULL, &revs, NULL);
refs_for_each_ref(get_main_ref_store(the_repository),
add_ref_to_pending, &revs);
}
/*
* Skipping promisor objects here is intentional, since it only excludes
* them from the list of reachable commits that we want to select from
* when computing the selection of MIDX'd commits to receive bitmaps.
*
* Reachability bitmaps do require that their objects be closed under
* reachability, but fetching any objects missing from promisors at this
* point is too late. But, if one of those objects can be reached from
* an another object that is included in the bitmap, then we will
* complain later that we don't have reachability closure (and fail
* appropriately).
*/
fetch_if_missing = 0;
revs.exclude_promisor_objects = 1;
if (prepare_revision_walk(&revs))
die(_("revision walk setup failed"));
traverse_commit_list(&revs, bitmap_show_commit, NULL, &cb);
if (indexed_commits_nr_p)
*indexed_commits_nr_p = cb.commits_nr;
release_revisions(&revs);
trace2_region_leave("midx", "find_commits_for_midx_bitmap",
the_repository);
return cb.commits;
}
static int write_midx_bitmap(const char *midx_name,
const unsigned char *midx_hash,
struct packing_data *pdata,
struct commit **commits,
uint32_t commits_nr,
uint32_t *pack_order,
unsigned flags)
{
int ret, i;
uint16_t options = 0;
struct bitmap_writer writer;
struct pack_idx_entry **index;
char *bitmap_name = xstrfmt("%s-%s.bitmap", midx_name,
hash_to_hex(midx_hash));
trace2_region_enter("midx", "write_midx_bitmap", the_repository);
if (flags & MIDX_WRITE_BITMAP_HASH_CACHE)
options |= BITMAP_OPT_HASH_CACHE;
if (flags & MIDX_WRITE_BITMAP_LOOKUP_TABLE)
options |= BITMAP_OPT_LOOKUP_TABLE;
/*
* Build the MIDX-order index based on pdata.objects (which is already
* in MIDX order; c.f., 'midx_pack_order_cmp()' for the definition of
* this order).
*/
ALLOC_ARRAY(index, pdata->nr_objects);
for (i = 0; i < pdata->nr_objects; i++)
index[i] = &pdata->objects[i].idx;
bitmap_writer_init(&writer, the_repository, pdata);
bitmap_writer_show_progress(&writer, flags & MIDX_PROGRESS);
bitmap_writer_build_type_index(&writer, index);
/*
* bitmap_writer_finish expects objects in lex order, but pack_order
* gives us exactly that. use it directly instead of re-sorting the
* array.
*
* This changes the order of objects in 'index' between
* bitmap_writer_build_type_index and bitmap_writer_finish.
*
* The same re-ordering takes place in the single-pack bitmap code via
* write_idx_file(), which is called by finish_tmp_packfile(), which
* happens between bitmap_writer_build_type_index() and
* bitmap_writer_finish().
*/
for (i = 0; i < pdata->nr_objects; i++)
index[pack_order[i]] = &pdata->objects[i].idx;
bitmap_writer_select_commits(&writer, commits, commits_nr);
ret = bitmap_writer_build(&writer);
if (ret < 0)
goto cleanup;
bitmap_writer_set_checksum(&writer, midx_hash);
bitmap_writer_finish(&writer, index, bitmap_name, options);
cleanup:
free(index);
free(bitmap_name);
bitmap_writer_free(&writer);
trace2_region_leave("midx", "write_midx_bitmap", the_repository);
return ret;
}
static struct multi_pack_index *lookup_multi_pack_index(struct repository *r,
const char *object_dir)
{
struct multi_pack_index *result = NULL;
struct multi_pack_index *cur;
char *obj_dir_real = real_pathdup(object_dir, 1);
struct strbuf cur_path_real = STRBUF_INIT;
/* Ensure the given object_dir is local, or a known alternate. */
find_odb(r, obj_dir_real);
for (cur = get_multi_pack_index(r); cur; cur = cur->next) {
strbuf_realpath(&cur_path_real, cur->object_dir, 1);
if (!strcmp(obj_dir_real, cur_path_real.buf)) {
result = cur;
goto cleanup;
}
}
cleanup:
free(obj_dir_real);
strbuf_release(&cur_path_real);
return result;
}
static int fill_packs_from_midx(struct write_midx_context *ctx,
const char *preferred_pack_name, uint32_t flags)
{
struct multi_pack_index *m;
for (m = ctx->m; m; m = m->base_midx) {
uint32_t i;
for (i = 0; i < m->num_packs; i++) {
ALLOC_GROW(ctx->info, ctx->nr + 1, ctx->alloc);
/*
* If generating a reverse index, need to have
* packed_git's loaded to compare their
* mtimes and object count.
*
* If a preferred pack is specified, need to
* have packed_git's loaded to ensure the chosen
* preferred pack has a non-zero object count.
*/
if (flags & MIDX_WRITE_REV_INDEX ||
preferred_pack_name) {
if (prepare_midx_pack(the_repository, m,
m->num_packs_in_base + i)) {
error(_("could not load pack"));
return 1;
}
if (open_pack_index(m->packs[i]))
die(_("could not open index for %s"),
m->packs[i]->pack_name);
}
fill_pack_info(&ctx->info[ctx->nr++], m->packs[i],
m->pack_names[i],
m->num_packs_in_base + i);
}
}
return 0;
}
static struct {
const char *non_split;
const char *split;
} midx_exts[] = {
{NULL, MIDX_EXT_MIDX},
{MIDX_EXT_BITMAP, MIDX_EXT_BITMAP},
{MIDX_EXT_REV, MIDX_EXT_REV},
};
static int link_midx_to_chain(struct multi_pack_index *m)
{
struct strbuf from = STRBUF_INIT;
struct strbuf to = STRBUF_INIT;
int ret = 0;
size_t i;
if (!m || m->has_chain) {
/*
* Either no MIDX previously existed, or it was already
* part of a MIDX chain. In both cases, we have nothing
* to link, so return early.
*/
goto done;
}
for (i = 0; i < ARRAY_SIZE(midx_exts); i++) {
const unsigned char *hash = get_midx_checksum(m);
get_midx_filename_ext(&from, m->object_dir, hash,
midx_exts[i].non_split);
get_split_midx_filename_ext(&to, m->object_dir, hash,
midx_exts[i].split);
if (link(from.buf, to.buf) < 0 && errno != ENOENT) {
ret = error_errno(_("unable to link '%s' to '%s'"),