Move "read_tree()" to "tree.c" to be used as a generic helper function.

diff --git a/write-tree.c b/write-tree.c
index 012eeeff1b5dd90149ebcd9eed139698c9fab035..827809dbddbff6dd8cf842641f6db5ad2f3ae07a 100644 (file)
--- a/write-tree.c
+++ b/write-tree.c
@@ -29,43 +29,102 @@ static int prepend_integer(char *buffer, unsigned val, int i)
 
 #define ORIG_OFFSET (40)       /* Enough space to add the header of "tree <size>\0" */
 
-int main(int argc, char **argv)
+static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
 {
-       unsigned long size, offset, val;
-       int i, entries = read_cache();
+       unsigned char subdir_sha1[20];
+       unsigned long size, offset;
        char *buffer;
+       int i, nr;
 
-       if (entries <= 0) {
-               fprintf(stderr, "No file-cache to create a tree of\n");
-               exit(1);
-       }
-
-       /* Guess at an initial size */
-       size = entries * 40 + 400;
+       /* Guess at some random initial size */
+       size = 8192;
        buffer = malloc(size);
        offset = ORIG_OFFSET;
 
-       for (i = 0; i < entries; i++) {
-               struct cache_entry *ce = active_cache[i];
-               if (check_valid_sha1(ce->sha1) < 0)
+       nr = 0;
+       do {
+               struct cache_entry *ce = cachep[nr];
+               const char *pathname = ce->name, *filename, *dirname;
+               int pathlen = ce_namelen(ce), entrylen;
+               unsigned char *sha1;
+               unsigned int mode;
+
+               /* Did we hit the end of the directory? Return how many we wrote */
+               if (baselen >= pathlen || memcmp(base, pathname, baselen))
+                       break;
+
+               sha1 = ce->sha1;
+               mode = ntohl(ce->ce_mode);
+
+               /* Do we have _further_ subdirectories? */
+               filename = pathname + baselen;
+               dirname = strchr(filename, '/');
+               if (dirname) {
+                       int subdir_written;
+
+                       subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
+                       nr += subdir_written;
+
+                       /* Now we need to write out the directory entry into this tree.. */
+                       mode = S_IFDIR;
+                       pathlen = dirname - pathname;
+
+                       /* ..but the directory entry doesn't count towards the total count */
+                       nr--;
+                       sha1 = subdir_sha1;
+               }
+
+               if (check_valid_sha1(sha1) < 0)
                        exit(1);
-               if (offset + ce->namelen + 60 > size) {
-                       size = alloc_nr(offset + ce->namelen + 60);
+
+               entrylen = pathlen - baselen;
+               if (offset + entrylen + 100 > size) {
+                       size = alloc_nr(offset + entrylen + 100);
                        buffer = realloc(buffer, size);
                }
-               offset += sprintf(buffer + offset, "%o %s", ce->st_mode, ce->name);
+               offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
                buffer[offset++] = 0;
-               memcpy(buffer + offset, ce->sha1, 20);
+               memcpy(buffer + offset, sha1, 20);
                offset += 20;
-       }
+               nr++;
+       } while (nr < maxentries);
 
        i = prepend_integer(buffer, offset - ORIG_OFFSET, ORIG_OFFSET);
        i -= 5;
        memcpy(buffer+i, "tree ", 5);
 
-       buffer += i;
-       offset -= i;
+       write_sha1_file(buffer + i, offset - i, returnsha1);
+       free(buffer);
+       return nr;
+}
+
+int main(int argc, char **argv)
+{
+       int i, unmerged;
+       int entries = read_cache();
+       unsigned char sha1[20];
+
+       if (entries <= 0)
+               die("write-tree: no cache contents to write");
+
+       /* Verify that the tree is merged */
+       unmerged = 0;
+       for (i = 0; i < entries; i++) {
+               struct cache_entry *ce = active_cache[i];
+               if (ntohs(ce->ce_flags) & ~CE_NAMEMASK) {
+                       if (++unmerged > 10) {
+                               fprintf(stderr, "...\n");
+                               break;
+                       }
+                       fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
+               }
+       }
+       if (unmerged)
+               die("write-tree: not able to write tree");
 
-       write_sha1_file(buffer, offset);
+       /* Ok, write it out */
+       if (write_tree(active_cache, entries, "", 0, sha1) != entries)
+               die("write-tree: internal error");
+       printf("%s\n", sha1_to_hex(sha1));
        return 0;
 }