diff options
Diffstat (limited to 'third_party/git/server-info.c')
| -rw-r--r-- | third_party/git/server-info.c | 367 |
1 files changed, 0 insertions, 367 deletions
diff --git a/third_party/git/server-info.c b/third_party/git/server-info.c deleted file mode 100644 index bae2cdfd5127..000000000000 --- a/third_party/git/server-info.c +++ /dev/null @@ -1,367 +0,0 @@ -#include "cache.h" -#include "dir.h" -#include "repository.h" -#include "refs.h" -#include "object.h" -#include "commit.h" -#include "tag.h" -#include "packfile.h" -#include "object-store.h" -#include "strbuf.h" - -struct update_info_ctx { - FILE *cur_fp; - FILE *old_fp; /* becomes NULL if it differs from cur_fp */ - struct strbuf cur_sb; - struct strbuf old_sb; -}; - -static void uic_mark_stale(struct update_info_ctx *uic) -{ - fclose(uic->old_fp); - uic->old_fp = NULL; -} - -static int uic_is_stale(const struct update_info_ctx *uic) -{ - return uic->old_fp == NULL; -} - -static int uic_printf(struct update_info_ctx *uic, const char *fmt, ...) -{ - va_list ap; - int ret = -1; - - va_start(ap, fmt); - - if (uic_is_stale(uic)) { - ret = vfprintf(uic->cur_fp, fmt, ap); - } else { - ssize_t r; - struct strbuf *cur = &uic->cur_sb; - struct strbuf *old = &uic->old_sb; - - strbuf_reset(cur); - strbuf_vinsertf(cur, 0, fmt, ap); - - strbuf_reset(old); - strbuf_grow(old, cur->len); - r = fread(old->buf, 1, cur->len, uic->old_fp); - if (r != cur->len || memcmp(old->buf, cur->buf, r)) - uic_mark_stale(uic); - - if (fwrite(cur->buf, 1, cur->len, uic->cur_fp) == cur->len) - ret = 0; - } - - va_end(ap); - - return ret; -} - -/* - * Create the file "path" by writing to a temporary file and renaming - * it into place. The contents of the file come from "generate", which - * should return non-zero if it encounters an error. - */ -static int update_info_file(char *path, - int (*generate)(struct update_info_ctx *), - int force) -{ - char *tmp = mkpathdup("%s_XXXXXX", path); - int ret = -1; - int fd = -1; - FILE *to_close; - struct update_info_ctx uic = { - .cur_fp = NULL, - .old_fp = NULL, - .cur_sb = STRBUF_INIT, - .old_sb = STRBUF_INIT - }; - - safe_create_leading_directories(path); - fd = git_mkstemp_mode(tmp, 0666); - if (fd < 0) - goto out; - to_close = uic.cur_fp = fdopen(fd, "w"); - if (!uic.cur_fp) - goto out; - fd = -1; - - /* no problem on ENOENT and old_fp == NULL, it's stale, now */ - if (!force) - uic.old_fp = fopen_or_warn(path, "r"); - - /* - * uic_printf will compare incremental comparison against old_fp - * and mark uic as stale if needed - */ - ret = generate(&uic); - if (ret) - goto out; - - /* new file may be shorter than the old one, check here */ - if (!uic_is_stale(&uic)) { - struct stat st; - long new_len = ftell(uic.cur_fp); - int old_fd = fileno(uic.old_fp); - - if (new_len < 0) { - ret = -1; - goto out; - } - if (fstat(old_fd, &st) || (st.st_size != (size_t)new_len)) - uic_mark_stale(&uic); - } - - uic.cur_fp = NULL; - if (fclose(to_close)) - goto out; - - if (uic_is_stale(&uic)) { - if (adjust_shared_perm(tmp) < 0) - goto out; - if (rename(tmp, path) < 0) - goto out; - } else { - unlink(tmp); - } - ret = 0; - -out: - if (ret) { - error_errno("unable to update %s", path); - if (uic.cur_fp) - fclose(uic.cur_fp); - else if (fd >= 0) - close(fd); - unlink(tmp); - } - free(tmp); - if (uic.old_fp) - fclose(uic.old_fp); - strbuf_release(&uic.old_sb); - strbuf_release(&uic.cur_sb); - return ret; -} - -static int add_info_ref(const char *path, const struct object_id *oid, - int flag, void *cb_data) -{ - struct update_info_ctx *uic = cb_data; - struct object *o = parse_object(the_repository, oid); - if (!o) - return -1; - - if (uic_printf(uic, "%s %s\n", oid_to_hex(oid), path) < 0) - return -1; - - if (o->type == OBJ_TAG) { - o = deref_tag(the_repository, o, path, 0); - if (o) - if (uic_printf(uic, "%s %s^{}\n", - oid_to_hex(&o->oid), path) < 0) - return -1; - } - return 0; -} - -static int generate_info_refs(struct update_info_ctx *uic) -{ - return for_each_ref(add_info_ref, uic); -} - -static int update_info_refs(int force) -{ - char *path = git_pathdup("info/refs"); - int ret = update_info_file(path, generate_info_refs, force); - free(path); - return ret; -} - -/* packs */ -static struct pack_info { - struct packed_git *p; - int old_num; - int new_num; -} **info; -static int num_pack; - -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; - if (!strcmp(pack_basename(p), 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 *packname, int old_cnt) -{ - struct pack_info *i = find_pack_by_name(packname); - 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; - struct strbuf line = STRBUF_INIT; - int old_cnt = 0; - int stale = 1; - - fp = fopen_or_warn(infofile, "r"); - if (!fp) - return 1; /* nonexistent is not an error. */ - - while (strbuf_getline(&line, fp) != EOF) { - const char *arg; - - if (!line.len) - continue; - - if (skip_prefix(line.buf, "P ", &arg)) { - /* P name */ - if (parse_pack_def(arg, old_cnt++)) - goto out_stale; - } else if (line.buf[0] == 'D') { - /* we used to emit D but that was misguided. */ - goto out_stale; - } else if (line.buf[0] == 'T') { - /* we used to emit T but nobody uses it. */ - goto out_stale; - } else { - error("unrecognized: %s", line.buf); - } - } - stale = 0; - - out_stale: - strbuf_release(&line); - fclose(fp); - return stale; -} - -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; - size_t alloc = 0; - - for (p = get_all_packs(the_repository); p; p = p->next) { - /* we ignore things on alternate path since they are - * not available to the pullers in general. - */ - if (!p->pack_local || !file_exists(p->pack_name)) - continue; - - i = num_pack++; - ALLOC_GROW(info, num_pack, alloc); - info[i] = xcalloc(1, sizeof(struct pack_info)); - info[i]->p = p; - info[i]->old_num = -1; - } - - 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; - - /* renumber them */ - QSORT(info, num_pack, compare_info); - for (i = 0; i < num_pack; i++) - info[i]->new_num = i; -} - -static void free_pack_info(void) -{ - int i; - for (i = 0; i < num_pack; i++) - free(info[i]); - free(info); -} - -static int write_pack_info_file(struct update_info_ctx *uic) -{ - int i; - for (i = 0; i < num_pack; i++) { - if (uic_printf(uic, "P %s\n", pack_basename(info[i]->p)) < 0) - return -1; - } - if (uic_printf(uic, "\n") < 0) - return -1; - return 0; -} - -static int update_info_packs(int force) -{ - char *infofile = mkpathdup("%s/info/packs", get_object_directory()); - int ret; - - init_pack_info(infofile, force); - ret = update_info_file(infofile, write_pack_info_file, force); - free_pack_info(); - free(infofile); - return ret; -} - -/* 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; -} |