Documentation updates.
[gitweb.git] / sha1_file.c
index b18e467d8c93843882c892f8810904a9fcd20b01..64eac592bbf191b2c97ccf8739fdb0d4712d7788 100644 (file)
@@ -46,22 +46,8 @@ int get_sha1_hex(const char *hex, unsigned char *sha1)
        return 0;
 }
 
-static int get_sha1_file(const char *path, unsigned char *result)
-{
-       char buffer[60];
-       int fd = open(path, O_RDONLY);
-       int len;
-
-       if (fd < 0)
-               return -1;
-       len = read(fd, buffer, sizeof(buffer));
-       close(fd);
-       if (len < 40)
-               return -1;
-       return get_sha1_hex(buffer, result);
-}
-
-static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir;
+static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir,
+       *git_graft_file;
 static void setup_git_env(void)
 {
        git_dir = gitenv(GIT_DIR_ENVIRONMENT);
@@ -79,6 +65,9 @@ static void setup_git_env(void)
                git_index_file = xmalloc(strlen(git_dir) + 7);
                sprintf(git_index_file, "%s/index", git_dir);
        }
+       git_graft_file = gitenv(GRAFT_ENVIRONMENT);
+       if (!git_graft_file)
+               git_graft_file = strdup(git_path("info/grafts"));
 }
 
 char *get_object_directory(void)
@@ -102,32 +91,30 @@ char *get_index_file(void)
        return git_index_file;
 }
 
-int get_sha1(const char *str, unsigned char *sha1)
+char *get_graft_file(void)
 {
-       static char pathname[PATH_MAX];
-       static const char *prefix[] = {
-               "",
-               "refs",
-               "refs/tags",
-               "refs/heads",
-               "refs/snap",
-               NULL
-       };
-       const char **p;
-
-       if (!get_sha1_hex(str, sha1))
-               return 0;
-
-       if (!git_dir)
+       if (!git_graft_file)
                setup_git_env();
-       for (p = prefix; *p; p++) {
-               snprintf(pathname, sizeof(pathname), "%s/%s/%s",
-                        git_dir, *p, str);
-               if (!get_sha1_file(pathname, sha1))
-                       return 0;
-       }
+       return git_graft_file;
+}
+
+int safe_create_leading_directories(char *path)
+{
+       char *pos = path;
 
-       return -1;
+       while (pos) {
+               pos = strchr(pos, '/');
+               if (!pos)
+                       break;
+               *pos = 0;
+               if (mkdir(path, 0777) < 0)
+                       if (errno != EEXIST) {
+                               *pos = '/';
+                               return -1;
+                       }
+               *pos++ = '/';
+       }
+       return 0;
 }
 
 char * sha1_to_hex(const unsigned char *sha1)
@@ -185,84 +172,157 @@ char *sha1_file_name(const unsigned char *sha1)
        return base;
 }
 
-struct alternate_object_database *alt_odb;
+char *sha1_pack_name(const unsigned char *sha1)
+{
+       static const char hex[] = "0123456789abcdef";
+       static char *name, *base, *buf;
+       int i;
+
+       if (!base) {
+               const char *sha1_file_directory = get_object_directory();
+               int len = strlen(sha1_file_directory);
+               base = xmalloc(len + 60);
+               sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.pack", sha1_file_directory);
+               name = base + len + 11;
+       }
+
+       buf = name;
+
+       for (i = 0; i < 20; i++) {
+               unsigned int val = *sha1++;
+               *buf++ = hex[val >> 4];
+               *buf++ = hex[val & 0xf];
+       }
+       
+       return base;
+}
+
+char *sha1_pack_index_name(const unsigned char *sha1)
+{
+       static const char hex[] = "0123456789abcdef";
+       static char *name, *base, *buf;
+       int i;
+
+       if (!base) {
+               const char *sha1_file_directory = get_object_directory();
+               int len = strlen(sha1_file_directory);
+               base = xmalloc(len + 60);
+               sprintf(base, "%s/pack/pack-1234567890123456789012345678901234567890.idx", sha1_file_directory);
+               name = base + len + 11;
+       }
+
+       buf = name;
+
+       for (i = 0; i < 20; i++) {
+               unsigned int val = *sha1++;
+               *buf++ = hex[val >> 4];
+               *buf++ = hex[val & 0xf];
+       }
+       
+       return base;
+}
+
+struct alternate_object_database *alt_odb_list;
+static struct alternate_object_database **alt_odb_tail;
 
 /*
  * Prepare alternate object database registry.
- * alt_odb points at an array of struct alternate_object_database.
- * This array is terminated with an element that has both its base
- * and name set to NULL.  alt_odb[n] comes from n'th non-empty
- * element from colon separated ALTERNATE_DB_ENVIRONMENT environment
- * variable, and its base points at a statically allocated buffer
- * that contains "/the/directory/corresponding/to/.git/objects/...",
- * while its name points just after the slash at the end of
- * ".git/objects/" in the example above, and has enough space to hold
- * 40-byte hex SHA1, an extra slash for the first level indirection,
- * and the terminating NUL.
- * This function allocates the alt_odb array and all the strings
- * pointed by base fields of the array elements with one xmalloc();
- * the string pool immediately follows the array.
+ *
+ * The variable alt_odb_list points at the list of struct
+ * alternate_object_database.  The elements on this list come from
+ * non-empty elements from colon separated ALTERNATE_DB_ENVIRONMENT
+ * environment variable, and $GIT_OBJECT_DIRECTORY/info/alternates,
+ * whose contents is exactly in the same format as that environment
+ * variable.  Its base points at a statically allocated buffer that
+ * contains "/the/directory/corresponding/to/.git/objects/...", while
+ * its name points just after the slash at the end of ".git/objects/"
+ * in the example above, and has enough space to hold 40-byte hex
+ * SHA1, an extra slash for the first level indirection, and the
+ * terminating NUL.
  */
-void prepare_alt_odb(void)
+static void link_alt_odb_entries(const char *alt, const char *ep, int sep)
 {
-       int pass, totlen, i;
        const char *cp, *last;
-       char *op = NULL;
-       const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
+       struct alternate_object_database *ent;
 
-       if (alt_odb)
-               return;
-       /* The first pass counts how large an area to allocate to
-        * hold the entire alt_odb structure, including array of
-        * structs and path buffers for them.  The second pass fills
-        * the structure and prepares the path buffers for use by
-        * fill_sha1_path().
-        */
-       for (totlen = pass = 0; pass < 2; pass++) {
-               last = alt;
-               i = 0;
-               do {
-                       cp = strchr(last, ':') ? : last + strlen(last);
-                       if (last != cp) {
-                               /* 43 = 40-byte + 2 '/' + terminating NUL */
-                               int pfxlen = cp - last;
-                               int entlen = pfxlen + 43;
-                               if (pass == 0)
-                                       totlen += entlen;
-                               else {
-                                       alt_odb[i].base = op;
-                                       alt_odb[i].name = op + pfxlen + 1;
-                                       memcpy(op, last, pfxlen);
-                                       op[pfxlen] = op[pfxlen + 3] = '/';
-                                       op[entlen-1] = 0;
-                                       op += entlen;
-                               }
-                               i++;
-                       }
-                       while (*cp && *cp == ':')
+       last = alt;
+       while (last < ep) {
+               cp = last;
+               if (cp < ep && *cp == '#') {
+                       while (cp < ep && *cp != sep)
                                cp++;
-                       last = cp;
-               } while (*cp);
-               if (pass)
-                       break;
-               alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen);
-               alt_odb[i].base = alt_odb[i].name = NULL;
-               op = (char*)(&alt_odb[i+1]);
+                       last = cp + 1;
+                       continue;
+               }
+               for ( ; cp < ep && *cp != sep; cp++)
+                       ;
+               if (last != cp) {
+                       /* 43 = 40-byte + 2 '/' + terminating NUL */
+                       int pfxlen = cp - last;
+                       int entlen = pfxlen + 43;
+
+                       ent = xmalloc(sizeof(*ent) + entlen);
+                       *alt_odb_tail = ent;
+                       alt_odb_tail = &(ent->next);
+                       ent->next = NULL;
+
+                       memcpy(ent->base, last, pfxlen);
+                       ent->name = ent->base + pfxlen + 1;
+                       ent->base[pfxlen] = ent->base[pfxlen + 3] = '/';
+                       ent->base[entlen-1] = 0;
+               }
+               while (cp < ep && *cp == sep)
+                       cp++;
+               last = cp;
        }
 }
 
+void prepare_alt_odb(void)
+{
+       char path[PATH_MAX];
+       char *map;
+       int fd;
+       struct stat st;
+       char *alt;
+
+       alt = gitenv(ALTERNATE_DB_ENVIRONMENT);
+       if (!alt) alt = "";
+
+       sprintf(path, "%s/info/alternates", get_object_directory());
+       if (alt_odb_tail)
+               return;
+       alt_odb_tail = &alt_odb_list;
+       link_alt_odb_entries(alt, alt + strlen(alt), ':');
+
+       fd = open(path, O_RDONLY);
+       if (fd < 0)
+               return;
+       if (fstat(fd, &st) || (st.st_size == 0)) {
+               close(fd);
+               return;
+       }
+       map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
+       close(fd);
+       if (map == MAP_FAILED)
+               return;
+
+       link_alt_odb_entries(map, map + st.st_size, '\n');
+       munmap(map, st.st_size);
+}
+
 static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
 {
-       int i;
        char *name = sha1_file_name(sha1);
+       struct alternate_object_database *alt;
 
        if (!stat(name, st))
                return name;
        prepare_alt_odb();
-       for (i = 0; (name = alt_odb[i].name) != NULL; i++) {
+       for (alt = alt_odb_list; alt; alt = alt->next) {
+               name = alt->name;
                fill_sha1_path(name, sha1);
-               if (!stat(alt_odb[i].base, st))
-                       return alt_odb[i].base;
+               if (!stat(alt->base, st))
+                       return alt->base;
        }
        return NULL;
 }
@@ -345,6 +405,14 @@ void unuse_packed_git(struct packed_git *p)
 
 int use_packed_git(struct packed_git *p)
 {
+       if (!p->pack_size) {
+               struct stat st;
+               // We created the struct before we had the pack
+               stat(p->pack_name, &st);
+               if (!S_ISREG(st.st_mode))
+                       die("packfile %s not a regular file", p->pack_name);
+               p->pack_size = st.st_size;
+       }
        if (!p->pack_base) {
                int fd;
                struct stat st;
@@ -372,8 +440,10 @@ int use_packed_git(struct packed_git *p)
                 * this is cheap.
                 */
                if (memcmp((char*)(p->index_base) + p->index_size - 40,
-                          p->pack_base + p->pack_size - 20, 20))
+                          p->pack_base + p->pack_size - 20, 20)) {
+                             
                        die("packfile %s does not match index.", p->pack_name);
+               }
        }
        p->pack_last_used = pack_used_ctr++;
        p->pack_use_cnt++;
@@ -411,6 +481,43 @@ struct packed_git *add_packed_git(char *path, int path_len)
        return p;
 }
 
+struct packed_git *parse_pack_index(unsigned char *sha1)
+{
+       char *path = sha1_pack_index_name(sha1);
+       return parse_pack_index_file(sha1, path);
+}
+
+struct packed_git *parse_pack_index_file(const unsigned char *sha1, char *idx_path)
+{
+       struct packed_git *p;
+       unsigned long idx_size;
+       void *idx_map;
+       char *path;
+
+       if (check_packed_git_idx(idx_path, &idx_size, &idx_map))
+               return NULL;
+
+       path = sha1_pack_name(sha1);
+
+       p = xmalloc(sizeof(*p) + strlen(path) + 2);
+       strcpy(p->pack_name, path);
+       p->index_size = idx_size;
+       p->pack_size = 0;
+       p->index_base = idx_map;
+       p->next = NULL;
+       p->pack_base = NULL;
+       p->pack_last_used = 0;
+       p->pack_use_cnt = 0;
+       memcpy(p->sha1, sha1, 20);
+       return p;
+}
+
+void install_packed_git(struct packed_git *pack)
+{
+       pack->next = packed_git;
+       packed_git = pack;
+}
+
 static void prepare_packed_git_one(char *objdir)
 {
        char path[PATH_MAX];
@@ -439,22 +546,23 @@ static void prepare_packed_git_one(char *objdir)
                p->next = packed_git;
                packed_git = p;
        }
+       closedir(dir);
 }
 
 void prepare_packed_git(void)
 {
-       int i;
        static int run_once = 0;
+       struct alternate_object_database *alt;
 
-       if (run_once++)
+       if (run_once)
                return;
-
        prepare_packed_git_one(get_object_directory());
        prepare_alt_odb();
-       for (i = 0; alt_odb[i].base != NULL; i++) {
-               alt_odb[i].name[0] = 0;
-               prepare_packed_git_one(alt_odb[i].base);
+       for (alt = alt_odb_list; alt; alt = alt->next) {
+               alt->name[0] = 0;
+               prepare_packed_git_one(alt->base);
        }
+       run_once = 1;
 }
 
 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
@@ -471,8 +579,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long siz
 }
 
 static void *map_sha1_file_internal(const unsigned char *sha1,
-                                   unsigned long *size,
-                                   int say_error)
+                                   unsigned long *size)
 {
        struct stat st;
        void *map;
@@ -480,8 +587,6 @@ static void *map_sha1_file_internal(const unsigned char *sha1,
        char *filename = find_sha1_file(sha1, &st);
 
        if (!filename) {
-               if (say_error)
-                       error("cannot map sha1 file %s", sha1_to_hex(sha1));
                return NULL;
        }
 
@@ -495,8 +600,6 @@ static void *map_sha1_file_internal(const unsigned char *sha1,
                                break;
                /* Fallthrough */
                case 0:
-                       if (say_error)
-                               perror(filename);
                        return NULL;
                }
 
@@ -507,17 +610,12 @@ static void *map_sha1_file_internal(const unsigned char *sha1,
        }
        map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
        close(fd);
-       if (-1 == (int)(long)map)
+       if (map == MAP_FAILED)
                return NULL;
        *size = st.st_size;
        return map;
 }
 
-void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
-{
-       return map_sha1_file_internal(sha1, size, 1);
-}
-
 int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
 {
        /* Get the data stream */
@@ -983,6 +1081,20 @@ static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
        return 0;
 }
 
+struct packed_git *find_sha1_pack(const unsigned char *sha1, 
+                                 struct packed_git *packs)
+{
+       struct packed_git *p;
+       struct pack_entry e;
+
+       for (p = packs; p; p = p->next) {
+               if (find_pack_entry_one(sha1, &e, p))
+                       return p;
+       }
+       return NULL;
+       
+}
+
 int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
 {
        int status;
@@ -991,7 +1103,7 @@ int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep
        z_stream stream;
        char hdr[128];
 
-       map = map_sha1_file_internal(sha1, &mapsize, 0);
+       map = map_sha1_file_internal(sha1, &mapsize);
        if (!map) {
                struct pack_entry e;
 
@@ -1029,14 +1141,17 @@ void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size
 {
        unsigned long mapsize;
        void *map, *buf;
+       struct pack_entry e;
 
-       map = map_sha1_file_internal(sha1, &mapsize, 0);
+       if (find_pack_entry(sha1, &e))
+               return read_packed_sha1(sha1, type, size);
+       map = map_sha1_file_internal(sha1, &mapsize);
        if (map) {
                buf = unpack_sha1_file(map, mapsize, type, size);
                munmap(map, mapsize);
                return buf;
        }
-       return read_packed_sha1(sha1, type, size);
+       return NULL;
 }
 
 void *read_object_with_reference(const unsigned char *sha1,
@@ -1079,17 +1194,18 @@ void *read_object_with_reference(const unsigned char *sha1,
                        free(buffer);
                        return NULL;
                }
+               free(buffer);
                /* Now we have the ID of the referred-to object in
                 * actual_sha1.  Check again. */
        }
 }
 
-static char *write_sha1_file_prepare(void *buf,
-                                    unsigned long len,
-                                    const char *type,
-                                    unsigned char *sha1,
-                                    unsigned char *hdr,
-                                    int *hdrlen)
+char *write_sha1_file_prepare(void *buf,
+                             unsigned long len,
+                             const char *type,
+                             unsigned char *sha1,
+                             unsigned char *hdr,
+                             int *hdrlen)
 {
        SHA_CTX c;
 
@@ -1205,14 +1321,83 @@ int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned cha
        return 0;
 }
 
-int write_sha1_from_fd(const unsigned char *sha1, int fd)
+int write_sha1_to_fd(int fd, const unsigned char *sha1)
+{
+       ssize_t size;
+       unsigned long objsize;
+       int posn = 0;
+       void *map = map_sha1_file_internal(sha1, &objsize);
+       void *buf = map;
+       void *temp_obj = NULL;
+       z_stream stream;
+
+       if (!buf) {
+               unsigned char *unpacked;
+               unsigned long len;
+               char type[20];
+               char hdr[50];
+               int hdrlen;
+               // need to unpack and recompress it by itself
+               unpacked = read_packed_sha1(sha1, type, &len);
+
+               hdrlen = sprintf(hdr, "%s %lu", type, len) + 1;
+
+               /* Set it up */
+               memset(&stream, 0, sizeof(stream));
+               deflateInit(&stream, Z_BEST_COMPRESSION);
+               size = deflateBound(&stream, len + hdrlen);
+               temp_obj = buf = xmalloc(size);
+
+               /* Compress it */
+               stream.next_out = buf;
+               stream.avail_out = size;
+               
+               /* First header.. */
+               stream.next_in = (void *)hdr;
+               stream.avail_in = hdrlen;
+               while (deflate(&stream, 0) == Z_OK)
+                       /* nothing */;
+
+               /* Then the data itself.. */
+               stream.next_in = unpacked;
+               stream.avail_in = len;
+               while (deflate(&stream, Z_FINISH) == Z_OK)
+                       /* nothing */;
+               deflateEnd(&stream);
+               free(unpacked);
+               
+               objsize = stream.total_out;
+       }
+
+       do {
+               size = write(fd, buf + posn, objsize - posn);
+               if (size <= 0) {
+                       if (!size) {
+                               fprintf(stderr, "write closed");
+                       } else {
+                               perror("write ");
+                       }
+                       return -1;
+               }
+               posn += size;
+       } while (posn < objsize);
+
+       if (map)
+               munmap(map, objsize);
+       if (temp_obj)
+               free(temp_obj);
+
+       return 0;
+}
+
+int write_sha1_from_fd(const unsigned char *sha1, int fd, char *buffer,
+                      size_t bufsize, size_t *bufposn)
 {
        char *filename = sha1_file_name(sha1);
 
        int local;
        z_stream stream;
        unsigned char real_sha1[20];
-       unsigned char buf[4096];
        unsigned char discard[4096];
        int ret;
        SHA_CTX c;
@@ -1230,7 +1415,24 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd)
 
        do {
                ssize_t size;
-               size = read(fd, buf, 4096);
+               if (*bufposn) {
+                       stream.avail_in = *bufposn;
+                       stream.next_in = (unsigned char *) buffer;
+                       do {
+                               stream.next_out = discard;
+                               stream.avail_out = sizeof(discard);
+                               ret = inflate(&stream, Z_SYNC_FLUSH);
+                               SHA1_Update(&c, discard, sizeof(discard) -
+                                           stream.avail_out);
+                       } while (stream.avail_in && ret == Z_OK);
+                       write(local, buffer, *bufposn - stream.avail_in);
+                       memmove(buffer, buffer + *bufposn - stream.avail_in,
+                               stream.avail_in);
+                       *bufposn = stream.avail_in;
+                       if (ret != Z_OK)
+                               break;
+               }
+               size = read(fd, buffer + *bufposn, bufsize - *bufposn);
                if (size <= 0) {
                        close(local);
                        unlink(filename);
@@ -1239,18 +1441,8 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd)
                        perror("Reading from connection");
                        return -1;
                }
-               write(local, buf, size);
-               stream.avail_in = size;
-               stream.next_in = buf;
-               do {
-                       stream.next_out = discard;
-                       stream.avail_out = sizeof(discard);
-                       ret = inflate(&stream, Z_SYNC_FLUSH);
-                       SHA1_Update(&c, discard, sizeof(discard) -
-                                   stream.avail_out);
-               } while (stream.avail_in && ret == Z_OK);
-               
-       } while (ret == Z_OK);
+               *bufposn += size;
+       } while (1);
        inflateEnd(&stream);
 
        close(local);
@@ -1267,30 +1459,61 @@ int write_sha1_from_fd(const unsigned char *sha1, int fd)
        return 0;
 }
 
+int has_pack_index(const unsigned char *sha1)
+{
+       struct stat st;
+       if (stat(sha1_pack_index_name(sha1), &st))
+               return 0;
+       return 1;
+}
+
+int has_pack_file(const unsigned char *sha1)
+{
+       struct stat st;
+       if (stat(sha1_pack_name(sha1), &st))
+               return 0;
+       return 1;
+}
+
+int has_sha1_pack(const unsigned char *sha1)
+{
+       struct pack_entry e;
+       return find_pack_entry(sha1, &e);
+}
+
 int has_sha1_file(const unsigned char *sha1)
 {
        struct stat st;
        struct pack_entry e;
 
-       if (find_sha1_file(sha1, &st))
+       if (find_pack_entry(sha1, &e))
                return 1;
-       return find_pack_entry(sha1, &e);
+       return find_sha1_file(sha1, &st) ? 1 : 0;
 }
 
-int index_fd(unsigned char *sha1, int fd, struct stat *st)
+int index_fd(unsigned char *sha1, int fd, struct stat *st, int write_object, const char *type)
 {
        unsigned long size = st->st_size;
        void *buf;
        int ret;
+       unsigned char hdr[50];
+       int hdrlen;
 
        buf = "";
        if (size)
                buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
        close(fd);
-       if ((int)(long)buf == -1)
+       if (buf == MAP_FAILED)
                return -1;
 
-       ret = write_sha1_file(buf, size, "blob", sha1);
+       if (!type)
+               type = "blob";
+       if (write_object)
+               ret = write_sha1_file(buf, size, type, sha1);
+       else {
+               write_sha1_file_prepare(buf, size, type, sha1, hdr, &hdrlen);
+               ret = 0;
+       }
        if (size)
                munmap(buf, size);
        return ret;