diff options
Diffstat (limited to 'server-info.c')
| -rw-r--r-- | server-info.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/server-info.c b/server-info.c new file mode 100644 index 0000000000..4098ca2b5c --- /dev/null +++ b/server-info.c @@ -0,0 +1,252 @@ +#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, int flag, void *cb_data) +{ + struct object *o = parse_object(sha1); + if (!o) + return -1; + + fprintf(info_ref_fp, "%s %s\n", sha1_to_hex(sha1), path); + if (o->type == OBJ_TAG) { + 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 = git_pathdup("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", path1); + for_each_ref(add_info_ref, NULL); + fclose(info_ref_fp); + adjust_shared_perm(path1); + 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; /* nonexistent is not an error. */ + + while (fgets(line, sizeof(line), fp)) { + int len = strlen(line); + if (len && 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); + adjust_shared_perm(name); + 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_or_warn(git_path("info/rev-cache")); + + return errs; +} |