Really honour NO_PYTHON

[git.git] / write-tree.c

diff --git a/write-tree.c b/write-tree.c
index b58871c..f866059 100644 (file)
--- a/write-tree.c
+++ b/write-tree.c
@@ -5,44 +5,33 @@
  */
 #include "cache.h"
 
+static int missing_ok = 0;
+
 static int check_valid_sha1(unsigned char *sha1)
 {
-       char *filename = sha1_file_name(sha1);
        int ret;
 
        /* If we were anal, we'd check that the sha1 of the contents actually matches */
-       ret = access(filename, R_OK);
-       if (ret)
-               perror(filename);
-       return ret;
-}
-
-static int prepend_integer(char *buffer, unsigned val, int i)
-{
-       buffer[--i] = '\0';
-       do {
-               buffer[--i] = '0' + (val % 10);
-               val /= 10;
-       } while (val);
-       return i;
+       ret = has_sha1_file(sha1);
+       if (ret == 0)
+               perror(sha1_file_name(sha1));
+       return ret ? 0 : -1;
 }
 
-#define ORIG_OFFSET (40)       /* Enough space to add the header of "tree <size>\0" */
-
 static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
 {
        unsigned char subdir_sha1[20];
        unsigned long size, offset;
        char *buffer;
-       int i, nr;
+       int nr;
 
        /* Guess at some random initial size */
        size = 8192;
-       buffer = malloc(size);
-       offset = ORIG_OFFSET;
+       buffer = xmalloc(size);
+       offset = 0;
 
        nr = 0;
-       do {
+       while (nr < maxentries) {
                struct cache_entry *ce = cachep[nr];
                const char *pathname = ce->name, *filename, *dirname;
                int pathlen = ce_namelen(ce), entrylen;
@@ -74,59 +63,95 @@ static int write_tree(struct cache_entry **cachep, int maxentries, const char *b
                        sha1 = subdir_sha1;
                }
 
-               if (check_valid_sha1(sha1) < 0)
+               if (!missing_ok && check_valid_sha1(sha1) < 0)
                        exit(1);
 
                entrylen = pathlen - baselen;
                if (offset + entrylen + 100 > size) {
                        size = alloc_nr(offset + entrylen + 100);
-                       buffer = realloc(buffer, size);
+                       buffer = xrealloc(buffer, size);
                }
                offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
                buffer[offset++] = 0;
                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, offset, returnsha1);
+       write_sha1_file(buffer, offset, "tree", returnsha1);
+       free(buffer);
        return nr;
 }
 
+static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
+
 int main(int argc, char **argv)
 {
-       int i, unmerged;
-       int entries = read_cache();
+       int i, funny;
+       int entries;
        unsigned char sha1[20];
+       
+       setup_git_directory();
+
+       entries = read_cache();
+       if (argc == 2) {
+               if (!strcmp(argv[1], "--missing-ok"))
+                       missing_ok = 1;
+               else
+                       die(write_tree_usage);
+       }
+       
+       if (argc > 2)
+               die("too many options");
 
-       if (entries <= 0)
-               die("write-tree: no cache contents to write");
+       if (entries < 0)
+               die("git-write-tree: error reading cache");
 
        /* Verify that the tree is merged */
-       unmerged = 0;
+       funny = 0;
        for (i = 0; i < entries; i++) {
                struct cache_entry *ce = active_cache[i];
                if (ntohs(ce->ce_flags) & ~CE_NAMEMASK) {
-                       if (++unmerged > 10) {
+                       if (10 < ++funny) {
                                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");
+       if (funny)
+               die("git-write-tree: not able to write tree");
+
+       /* Also verify that the cache does not have path and path/file
+        * at the same time.  At this point we know the cache has only
+        * stage 0 entries.
+        */
+       funny = 0;
+       for (i = 0; i < entries - 1; i++) {
+               /* path/file always comes after path because of the way
+                * the cache is sorted.  Also path can appear only once,
+                * which means conflicting one would immediately follow.
+                */
+               const char *this_name = active_cache[i]->name;
+               const char *next_name = active_cache[i+1]->name;
+               int this_len = strlen(this_name);
+               if (this_len < strlen(next_name) &&
+                   strncmp(this_name, next_name, this_len) == 0 &&
+                   next_name[this_len] == '/') {
+                       if (10 < ++funny) {
+                               fprintf(stderr, "...\n");
+                               break;
+                       }
+                       fprintf(stderr, "You have both %s and %s\n",
+                               this_name, next_name);
+               }
+       }
+       if (funny)
+               die("git-write-tree: not able to write tree");
 
        /* Ok, write it out */
        if (write_tree(active_cache, entries, "", 0, sha1) != entries)
-               die("write-tree: internal error");
+               die("git-write-tree: internal error");
        printf("%s\n", sha1_to_hex(sha1));
        return 0;
 }