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https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
![Junio C Hamano](/assets/img/avatar_default.png)
We often try to open a file for reading whose existence is optional, and silently ignore errors from open/fopen; report such errors if they are not due to missing files. * nd/fopen-errors: mingw_fopen: report ENOENT for invalid file names mingw: verify that paths are not mistaken for remote nicknames log: fix memory leak in open_next_file() rerere.c: move error_errno() closer to the source system call print errno when reporting a system call error wrapper.c: make warn_on_inaccessible() static wrapper.c: add and use fopen_or_warn() wrapper.c: add and use warn_on_fopen_errors() config.mak.uname: set FREAD_READS_DIRECTORIES for Darwin, too config.mak.uname: set FREAD_READS_DIRECTORIES for Linux and FreeBSD clone: use xfopen() instead of fopen() use xfopen() in more places git_fopen: fix a sparse 'not declared' warning
288 lines
5.7 KiB
C
288 lines
5.7 KiB
C
#include "cache.h"
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#include "refs.h"
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#include "object.h"
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#include "commit.h"
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#include "tag.h"
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/*
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* Create the file "path" by writing to a temporary file and renaming
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* it into place. The contents of the file come from "generate", which
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* should return non-zero if it encounters an error.
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*/
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static int update_info_file(char *path, int (*generate)(FILE *))
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{
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char *tmp = mkpathdup("%s_XXXXXX", path);
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int ret = -1;
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int fd = -1;
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FILE *fp = NULL, *to_close;
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safe_create_leading_directories(path);
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fd = git_mkstemp_mode(tmp, 0666);
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if (fd < 0)
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goto out;
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to_close = fp = fdopen(fd, "w");
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if (!fp)
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goto out;
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fd = -1;
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ret = generate(fp);
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if (ret)
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goto out;
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fp = NULL;
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if (fclose(to_close))
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goto out;
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if (adjust_shared_perm(tmp) < 0)
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goto out;
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if (rename(tmp, path) < 0)
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goto out;
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ret = 0;
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out:
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if (ret) {
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error_errno("unable to update %s", path);
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if (fp)
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fclose(fp);
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else if (fd >= 0)
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close(fd);
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unlink(tmp);
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}
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free(tmp);
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return ret;
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}
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static int add_info_ref(const char *path, const struct object_id *oid,
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int flag, void *cb_data)
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{
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FILE *fp = cb_data;
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struct object *o = parse_object(oid);
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if (!o)
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return -1;
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if (fprintf(fp, "%s %s\n", oid_to_hex(oid), path) < 0)
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return -1;
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if (o->type == OBJ_TAG) {
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o = deref_tag(o, path, 0);
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if (o)
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if (fprintf(fp, "%s %s^{}\n",
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oid_to_hex(&o->oid), path) < 0)
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return -1;
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}
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return 0;
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}
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static int generate_info_refs(FILE *fp)
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{
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return for_each_ref(add_info_ref, fp);
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}
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static int update_info_refs(int force)
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{
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char *path = git_pathdup("info/refs");
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int ret = update_info_file(path, generate_info_refs);
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free(path);
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return ret;
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}
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/* packs */
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static struct pack_info {
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struct packed_git *p;
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int old_num;
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int new_num;
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int nr_alloc;
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int nr_heads;
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unsigned char (*head)[20];
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} **info;
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static int num_pack;
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static const char *objdir;
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static int objdirlen;
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static struct pack_info *find_pack_by_name(const char *name)
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{
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int i;
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for (i = 0; i < num_pack; i++) {
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struct packed_git *p = info[i]->p;
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/* skip "/pack/" after ".git/objects" */
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if (!strcmp(p->pack_name + objdirlen + 6, name))
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return info[i];
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}
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return NULL;
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}
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/* Returns non-zero when we detect that the info in the
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* old file is useless.
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*/
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static int parse_pack_def(const char *line, int old_cnt)
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{
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struct pack_info *i = find_pack_by_name(line + 2);
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if (i) {
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i->old_num = old_cnt;
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return 0;
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}
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else {
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/* The file describes a pack that is no longer here */
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return 1;
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}
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}
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/* Returns non-zero when we detect that the info in the
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* old file is useless.
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*/
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static int read_pack_info_file(const char *infofile)
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{
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FILE *fp;
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char line[1000];
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int old_cnt = 0;
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fp = fopen_or_warn(infofile, "r");
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if (!fp)
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return 1; /* nonexistent is not an error. */
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while (fgets(line, sizeof(line), fp)) {
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int len = strlen(line);
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if (len && line[len-1] == '\n')
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line[--len] = 0;
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if (!len)
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continue;
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switch (line[0]) {
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case 'P': /* P name */
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if (parse_pack_def(line, old_cnt++))
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goto out_stale;
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break;
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case 'D': /* we used to emit D but that was misguided. */
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case 'T': /* we used to emit T but nobody uses it. */
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goto out_stale;
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default:
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error("unrecognized: %s", line);
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break;
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}
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}
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fclose(fp);
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return 0;
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out_stale:
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fclose(fp);
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return 1;
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}
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static int compare_info(const void *a_, const void *b_)
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{
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struct pack_info *const *a = a_;
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struct pack_info *const *b = b_;
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if (0 <= (*a)->old_num && 0 <= (*b)->old_num)
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/* Keep the order in the original */
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return (*a)->old_num - (*b)->old_num;
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else if (0 <= (*a)->old_num)
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/* Only A existed in the original so B is obviously newer */
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return -1;
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else if (0 <= (*b)->old_num)
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/* The other way around. */
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return 1;
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/* then it does not matter but at least keep the comparison stable */
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if ((*a)->p == (*b)->p)
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return 0;
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else if ((*a)->p < (*b)->p)
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return -1;
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else
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return 1;
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}
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static void init_pack_info(const char *infofile, int force)
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{
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struct packed_git *p;
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int stale;
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int i = 0;
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objdir = get_object_directory();
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objdirlen = strlen(objdir);
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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/* we ignore things on alternate path since they are
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* not available to the pullers in general.
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*/
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if (!p->pack_local)
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continue;
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i++;
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}
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num_pack = i;
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info = xcalloc(num_pack, sizeof(struct pack_info *));
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for (i = 0, p = packed_git; p; p = p->next) {
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if (!p->pack_local)
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continue;
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info[i] = xcalloc(1, sizeof(struct pack_info));
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info[i]->p = p;
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info[i]->old_num = -1;
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i++;
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}
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if (infofile && !force)
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stale = read_pack_info_file(infofile);
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else
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stale = 1;
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for (i = 0; i < num_pack; i++) {
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if (stale) {
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info[i]->old_num = -1;
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info[i]->nr_heads = 0;
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}
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}
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/* renumber them */
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QSORT(info, num_pack, compare_info);
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for (i = 0; i < num_pack; i++)
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info[i]->new_num = i;
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}
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static void free_pack_info(void)
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{
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int i;
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for (i = 0; i < num_pack; i++)
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free(info[i]);
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free(info);
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}
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static int write_pack_info_file(FILE *fp)
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{
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int i;
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for (i = 0; i < num_pack; i++) {
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if (fprintf(fp, "P %s\n", info[i]->p->pack_name + objdirlen + 6) < 0)
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return -1;
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}
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if (fputc('\n', fp) == EOF)
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return -1;
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return 0;
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}
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static int update_info_packs(int force)
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{
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char *infofile = mkpathdup("%s/info/packs", get_object_directory());
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int ret;
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init_pack_info(infofile, force);
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ret = update_info_file(infofile, write_pack_info_file);
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free_pack_info();
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free(infofile);
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return ret;
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}
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/* public */
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int update_server_info(int force)
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{
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/* We would add more dumb-server support files later,
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* including index of available pack files and their
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* intended audiences.
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*/
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int errs = 0;
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errs = errs | update_info_refs(force);
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errs = errs | update_info_packs(force);
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/* remove leftover rev-cache file if there is any */
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unlink_or_warn(git_path("info/rev-cache"));
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return errs;
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}
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