Documentation: --cherry-pick

diff --git a/index-pack.c b/index-pack.c
index c56458ebd57841d1fe8d0a2b1a1927d840295344..3c768fbc631387b59bbbae3423b65b6a311a702b 100644 (file)
--- a/index-pack.c
+++ b/index-pack.c
@@ -139,7 +139,7 @@ static const char *open_pack_file(const char *pack_name)
                if (!pack_name) {
                        static char tmpfile[PATH_MAX];
                        snprintf(tmpfile, sizeof(tmpfile),
-                                "%s/pack_XXXXXX", get_object_directory());
+                                "%s/tmp_pack_XXXXXX", get_object_directory());
                        output_fd = mkstemp(tmpfile);
                        pack_name = xstrdup(tmpfile);
                } else
@@ -277,13 +277,19 @@ static void *get_data_from_pack(struct object_entry *obj)
 {
        unsigned long from = obj[0].offset + obj[0].hdr_size;
        unsigned long len = obj[1].offset - from;
+       unsigned long rdy = 0;
        unsigned char *src, *data;
        z_stream stream;
        int st;
 
        src = xmalloc(len);
-       if (pread(pack_fd, src, len, from) != len)
-               die("cannot pread pack file: %s", strerror(errno));
+       data = src;
+       do {
+               ssize_t n = pread(pack_fd, data + rdy, len - rdy, from + rdy);
+               if (n <= 0)
+                       die("cannot pread pack file: %s", strerror(errno));
+               rdy += n;
+       } while (rdy < len);
        data = xmalloc(obj->size);
        memset(&stream, 0, sizeof(stream));
        stream.next_out = data;
@@ -341,26 +347,19 @@ static int find_delta_children(const union delta_base *base,
 static void sha1_object(const void *data, unsigned long size,
                        enum object_type type, unsigned char *sha1)
 {
-       SHA_CTX ctx;
-       char header[50];
-       int header_size;
-       const char *type_str;
-
-       switch (type) {
-       case OBJ_COMMIT: type_str = commit_type; break;
-       case OBJ_TREE:   type_str = tree_type; break;
-       case OBJ_BLOB:   type_str = blob_type; break;
-       case OBJ_TAG:    type_str = tag_type; break;
-       default:
-               die("bad type %d", type);
+       hash_sha1_file(data, size, typename(type), sha1);
+       if (has_sha1_file(sha1)) {
+               void *has_data;
+               enum object_type has_type;
+               unsigned long has_size;
+               has_data = read_sha1_file(sha1, &has_type, &has_size);
+               if (!has_data)
+                       die("cannot read existing object %s", sha1_to_hex(sha1));
+               if (size != has_size || type != has_type ||
+                   memcmp(data, has_data, size) != 0)
+                       die("SHA1 COLLISION FOUND WITH %s !", sha1_to_hex(sha1));
+               free(has_data);
        }
-
-       header_size = sprintf(header, "%s %lu", type_str, size) + 1;
-
-       SHA1_Init(&ctx);
-       SHA1_Update(&ctx, header, header_size);
-       SHA1_Update(&ctx, data, size);
-       SHA1_Final(sha1, &ctx);
 }
 
 static void resolve_delta(struct object_entry *delta_obj, void *base_data,
@@ -457,7 +456,8 @@ static void parse_pack_objects(unsigned char *sha1)
        /* If input_fd is a file, we should have reached its end now. */
        if (fstat(input_fd, &st))
                die("cannot fstat packfile: %s", strerror(errno));
-       if (S_ISREG(st.st_mode) && st.st_size != consumed_bytes)
+       if (S_ISREG(st.st_mode) &&
+                       lseek(input_fd, 0, SEEK_CUR) - input_len != st.st_size)
                die("pack has junk at the end");
 
        if (!nr_deltas)
@@ -540,7 +540,7 @@ static int write_compressed(int fd, void *in, unsigned int size)
        return size;
 }
 
-static void append_obj_to_pack(void *buf,
+static void append_obj_to_pack(const unsigned char *sha1, void *buf,
                               unsigned long size, enum object_type type)
 {
        struct object_entry *obj = &objects[nr_objects++];
@@ -558,7 +558,7 @@ static void append_obj_to_pack(void *buf,
        write_or_die(output_fd, header, n);
        obj[1].offset = obj[0].offset + n;
        obj[1].offset += write_compressed(output_fd, buf, size);
-       sha1_object(buf, size, type, obj->sha1);
+       hashcpy(obj->sha1, sha1);
 }
 
 static int delta_pos_compare(const void *_a, const void *_b)
@@ -611,7 +611,9 @@ static void fix_unresolved_deltas(int nr_unresolved)
                                resolve_delta(child, data, size, type);
                }
 
-               append_obj_to_pack(data, size, type);
+               if (check_sha1_signature(d->base.sha1, data, size, typename(type)))
+                       die("local object %s is corrupt", sha1_to_hex(d->base.sha1));
+               append_obj_to_pack(d->base.sha1, data, size, type);
                free(data);
                if (verbose)
                        percent = display_progress(nr_resolved_deltas,
@@ -689,7 +691,7 @@ static const char *write_index_file(const char *index_name, unsigned char *sha1)
        if (!index_name) {
                static char tmpfile[PATH_MAX];
                snprintf(tmpfile, sizeof(tmpfile),
-                        "%s/index_XXXXXX", get_object_directory());
+                        "%s/tmp_idx_XXXXXX", get_object_directory());
                fd = mkstemp(tmpfile);
                index_name = xstrdup(tmpfile);
        } else {
@@ -746,7 +748,7 @@ static void final(const char *final_pack_name, const char *curr_pack_name,
                  const char *keep_name, const char *keep_msg,
                  unsigned char *sha1)
 {
-       char *report = "pack";
+       const char *report = "pack";
        char name[PATH_MAX];
        int err;