Cloning from a repo without "current branch"

diff --git a/sha1_file.c b/sha1_file.c
index cf855ac244cb47f7dabd0304689d451cb4febc27..7628ee97d9137c3cc2eae2e626fc708a88dc444a 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -33,7 +33,7 @@ const unsigned char null_sha1[20];
 
 static unsigned int sha1_file_open_flag = O_NOATIME;
 
-signed char hexval_table[256] = {
+const signed char hexval_table[256] = {
         -1, -1, -1, -1, -1, -1, -1, -1,                /* 00-07 */
         -1, -1, -1, -1, -1, -1, -1, -1,                /* 08-0f */
         -1, -1, -1, -1, -1, -1, -1, -1,                /* 10-17 */
@@ -193,7 +193,7 @@ char *sha1_pack_name(const unsigned char *sha1)
                *buf++ = hex[val >> 4];
                *buf++ = hex[val & 0xf];
        }
-       
+
        return base;
 }
 
@@ -218,7 +218,7 @@ char *sha1_pack_index_name(const unsigned char *sha1)
                *buf++ = hex[val >> 4];
                *buf++ = hex[val & 0xf];
        }
-       
+
        return base;
 }
 
@@ -376,11 +376,12 @@ void prepare_alt_odb(void)
 {
        const char *alt;
 
+       if (alt_odb_tail)
+               return;
+
        alt = getenv(ALTERNATE_DB_ENVIRONMENT);
        if (!alt) alt = "";
 
-       if (alt_odb_tail)
-               return;
        alt_odb_tail = &alt_odb_list;
        link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
 
@@ -412,7 +413,7 @@ static size_t peak_pack_mapped;
 static size_t pack_mapped;
 struct packed_git *packed_git;
 
-void pack_report()
+void pack_report(void)
 {
        fprintf(stderr,
                "pack_report: getpagesize()            = %10" SZ_FMT "\n"
@@ -530,6 +531,21 @@ static int check_packed_git_idx(const char *path,  struct packed_git *p)
        return 0;
 }
 
+int open_pack_index(struct packed_git *p)
+{
+       char *idx_name;
+       int ret;
+
+       if (p->index_data)
+               return 0;
+
+       idx_name = xstrdup(p->pack_name);
+       strcpy(idx_name + strlen(idx_name) - strlen(".pack"), ".idx");
+       ret = check_packed_git_idx(idx_name, p);
+       free(idx_name);
+       return ret;
+}
+
 static void scan_windows(struct packed_git *p,
        struct packed_git **lru_p,
        struct pack_window **lru_w,
@@ -605,6 +621,9 @@ static int open_packed_git_1(struct packed_git *p)
        unsigned char *idx_sha1;
        long fd_flag;
 
+       if (!p->index_data && open_pack_index(p))
+               return error("packfile %s index unavailable", p->pack_name);
+
        p->pack_fd = open(p->pack_name, O_RDONLY);
        if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
                return -1;
@@ -757,8 +776,7 @@ struct packed_git *add_packed_git(const char *path, int path_len, int local)
                return NULL;
        memcpy(p->pack_name, path, path_len);
        strcpy(p->pack_name + path_len, ".pack");
-       if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode) ||
-           check_packed_git_idx(path, p)) {
+       if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
                free(p);
                return NULL;
        }
@@ -766,6 +784,10 @@ struct packed_git *add_packed_git(const char *path, int path_len, int local)
        /* ok, it looks sane as far as we can check without
         * actually mapping the pack file.
         */
+       p->index_version = 0;
+       p->index_data = NULL;
+       p->index_size = 0;
+       p->num_objects = 0;
        p->pack_size = st.st_size;
        p->next = NULL;
        p->windows = NULL;
@@ -937,7 +959,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long siz
        return hashcmp(sha1, real_sha1) ? -1 : 0;
 }
 
-void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
+static void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 {
        struct stat st;
        void *map;
@@ -1117,7 +1139,7 @@ static int parse_sha1_header(const char *hdr, unsigned long *sizep)
        unsigned long size;
 
        /*
-        * The type can be at most ten bytes (including the 
+        * The type can be at most ten bytes (including the
         * terminating '\0' that we add), and is followed by
         * a space.
         */
@@ -1572,10 +1594,15 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
        return data;
 }
 
-const unsigned char *nth_packed_object_sha1(const struct packed_git *p,
+const unsigned char *nth_packed_object_sha1(struct packed_git *p,
                                            uint32_t n)
 {
        const unsigned char *index = p->index_data;
+       if (!index) {
+               if (open_pack_index(p))
+                       return NULL;
+               index = p->index_data;
+       }
        if (n >= p->num_objects)
                return NULL;
        index += 4 * 256;
@@ -1612,6 +1639,12 @@ off_t find_pack_entry_one(const unsigned char *sha1,
        const unsigned char *index = p->index_data;
        unsigned hi, lo;
 
+       if (!index) {
+               if (open_pack_index(p))
+                       return 0;
+               level1_ofs = p->index_data;
+               index = p->index_data;
+       }
        if (p->index_version > 1) {
                level1_ofs += 2;
                index += 8;
@@ -1705,7 +1738,7 @@ static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, cons
        return 0;
 }
 
-struct packed_git *find_sha1_pack(const unsigned char *sha1, 
+struct packed_git *find_sha1_pack(const unsigned char *sha1,
                                  struct packed_git *packs)
 {
        struct packed_git *p;