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tag: v1.3.0
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Octocat-spinner-32-eaf2f5

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#include "cache.h"
#include "refs.h"
#include "object.h"
#include "commit.h"
#include "tag.h"

/* refs */
static FILE *info_ref_fp;

static int add_info_ref(const char *path, const unsigned char *sha1)
{
struct object *o = parse_object(sha1);

fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path);
if (o->type == tag_type) {
o = deref_tag(o, path, 0);
if (o)
fprintf(info_ref_fp, "%s %s^{}\n",
sha1_to_hex(o->sha1), path);
}
return 0;
}

static int update_info_refs(int force)
{
char *path0 = strdup(git_path("info/refs"));
int len = strlen(path0);
char *path1 = xmalloc(len + 2);

strcpy(path1, path0);
strcpy(path1 + len, "+");

safe_create_leading_directories(path0);
info_ref_fp = fopen(path1, "w");
if (!info_ref_fp)
return error("unable to update %s", path0);
for_each_ref(add_info_ref);
fclose(info_ref_fp);
rename(path1, path0);
free(path0);
free(path1);
return 0;
}

/* packs */
static struct pack_info {
struct packed_git *p;
int old_num;
int new_num;
int nr_alloc;
int nr_heads;
unsigned char (*head)[20];
} **info;
static int num_pack;
static const char *objdir;
static int objdirlen;

static struct pack_info *find_pack_by_name(const char *name)
{
int i;
for (i = 0; i < num_pack; i++) {
struct packed_git *p = info[i]->p;
/* skip "/pack/" after ".git/objects" */
if (!strcmp(p->pack_name + objdirlen + 6, name))
return info[i];
}
return NULL;
}

/* Returns non-zero when we detect that the info in the
* old file is useless.
*/
static int parse_pack_def(const char *line, int old_cnt)
{
struct pack_info *i = find_pack_by_name(line + 2);
if (i) {
i->old_num = old_cnt;
return 0;
}
else {
/* The file describes a pack that is no longer here */
return 1;
}
}

/* Returns non-zero when we detect that the info in the
* old file is useless.
*/
static int read_pack_info_file(const char *infofile)
{
FILE *fp;
char line[1000];
int old_cnt = 0;

fp = fopen(infofile, "r");
if (!fp)
return 1; /* nonexisting is not an error. */

while (fgets(line, sizeof(line), fp)) {
int len = strlen(line);
if (line[len-1] == '\n')
line[--len] = 0;

if (!len)
continue;

switch (line[0]) {
case 'P': /* P name */
if (parse_pack_def(line, old_cnt++))
goto out_stale;
break;
case 'D': /* we used to emit D but that was misguided. */
goto out_stale;
break;
case 'T': /* we used to emit T but nobody uses it. */
goto out_stale;
break;
default:
error("unrecognized: %s", line);
break;
}
}
fclose(fp);
return 0;
 out_stale:
fclose(fp);
return 1;
}

static int compare_info(const void *a_, const void *b_)
{
struct pack_info * const* a = a_;
struct pack_info * const* b = b_;

if (0 <= (*a)->old_num && 0 <= (*b)->old_num)
/* Keep the order in the original */
return (*a)->old_num - (*b)->old_num;
else if (0 <= (*a)->old_num)
/* Only A existed in the original so B is obviously newer */
return -1;
else if (0 <= (*b)->old_num)
/* The other way around. */
return 1;

/* then it does not matter but at least keep the comparison stable */
if ((*a)->p == (*b)->p)
return 0;
else if ((*a)->p < (*b)->p)
return -1;
else
return 1;
}

static void init_pack_info(const char *infofile, int force)
{
struct packed_git *p;
int stale;
int i = 0;

objdir = get_object_directory();
objdirlen = strlen(objdir);

prepare_packed_git();
for (p = packed_git; p; p = p->next) {
/* we ignore things on alternate path since they are
* not available to the pullers in general.
*/
if (!p->pack_local)
continue;
i++;
}
num_pack = i;
info = xcalloc(num_pack, sizeof(struct pack_info *));
for (i = 0, p = packed_git; p; p = p->next) {
if (!p->pack_local)
continue;
info[i] = xcalloc(1, sizeof(struct pack_info));
info[i]->p = p;
info[i]->old_num = -1;
i++;
}

if (infofile && !force)
stale = read_pack_info_file(infofile);
else
stale = 1;

for (i = 0; i < num_pack; i++) {
if (stale) {
info[i]->old_num = -1;
info[i]->nr_heads = 0;
}
}

/* renumber them */
qsort(info, num_pack, sizeof(info[0]), compare_info);
for (i = 0; i < num_pack; i++)
info[i]->new_num = i;
}

static void write_pack_info_file(FILE *fp)
{
int i;
for (i = 0; i < num_pack; i++)
fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6);
fputc('\n', fp);
}

static int update_info_packs(int force)
{
char infofile[PATH_MAX];
char name[PATH_MAX];
int namelen;
FILE *fp;

namelen = sprintf(infofile, "%s/info/packs", get_object_directory());
strcpy(name, infofile);
strcpy(name + namelen, "+");

init_pack_info(infofile, force);

safe_create_leading_directories(name);
fp = fopen(name, "w");
if (!fp)
return error("cannot open %s", name);
write_pack_info_file(fp);
fclose(fp);
rename(name, infofile);
return 0;
}

/* public */
int update_server_info(int force)
{
/* We would add more dumb-server support files later,
* including index of available pack files and their
* intended audiences.
*/
int errs = 0;

errs = errs | update_info_refs(force);
errs = errs | update_info_packs(force);

/* remove leftover rev-cache file if there is any */
unlink(git_path("info/rev-cache"));

return errs;
}
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