write-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 static int missing_ok = 0;
   9
  10 static int check_valid_sha1(unsigned char *sha1)
  11 {
  12         int ret;
  13
  14         /* If we were anal, we'd check that the sha1 of the contents actually matches */
  15         ret = has_sha1_file(sha1);
  16         if (ret == 0)
  17                 perror(sha1_file_name(sha1));
  18         return ret ? 0 : -1;
  19 }
  20
  21 static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
  22 {
  23         unsigned char subdir_sha1[20];
  24         unsigned long size, offset;
  25         char *buffer;
  26         int nr;
  27
  28         /* Guess at some random initial size */
  29         size = 8192;
  30         buffer = xmalloc(size);
  31         offset = 0;
  32
  33         nr = 0;
  34         while (nr < maxentries) {
  35                 struct cache_entry *ce = cachep[nr];
  36                 const char *pathname = ce->name, *filename, *dirname;
  37                 int pathlen = ce_namelen(ce), entrylen;
  38                 unsigned char *sha1;
  39                 unsigned int mode;
  40
  41                 /* Did we hit the end of the directory? Return how many we wrote */
  42                 if (baselen >= pathlen || memcmp(base, pathname, baselen))
  43                         break;
  44
  45                 sha1 = ce->sha1;
  46                 mode = ntohl(ce->ce_mode);
  47
  48                 /* Do we have _further_ subdirectories? */
  49                 filename = pathname + baselen;
  50                 dirname = strchr(filename, '/');
  51                 if (dirname) {
  52                         int subdir_written;
  53
  54                         subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
  55                         nr += subdir_written;
  56
  57                         /* Now we need to write out the directory entry into this tree.. */
  58                         mode = S_IFDIR;
  59                         pathlen = dirname - pathname;
  60
  61                         /* ..but the directory entry doesn't count towards the total count */
  62                         nr--;
  63                         sha1 = subdir_sha1;
  64                 }
  65
  66                 if (!missing_ok && check_valid_sha1(sha1) < 0)
  67                         exit(1);
  68
  69                 entrylen = pathlen - baselen;
  70                 if (offset + entrylen + 100 > size) {
  71                         size = alloc_nr(offset + entrylen + 100);
  72                         buffer = xrealloc(buffer, size);
  73                 }
  74                 offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
  75                 buffer[offset++] = 0;
  76                 memcpy(buffer + offset, sha1, 20);
  77                 offset += 20;
  78                 nr++;
  79         }
  80
  81         write_sha1_file(buffer, offset, "tree", returnsha1);
  82         free(buffer);
  83         return nr;
  84 }
  85
  86 int main(int argc, char **argv)
  87 {
  88         int i, funny;
  89         int entries = read_cache();
  90         unsigned char sha1[20];
  91
  92         if (argc == 2) {
  93                 if (!strcmp(argv[1], "--missing-ok"))
  94                         missing_ok = 1;
  95                 else
  96                         die("unknown option %s", argv[1]);
  97         }
  98
  99         if (argc > 2)
 100                 die("too many options");
 101
 102         if (entries < 0)
 103                 die("git-write-tree: error reading cache");
 104
 105         /* Verify that the tree is merged */
 106         funny = 0;
 107         for (i = 0; i < entries; i++) {
 108                 struct cache_entry *ce = active_cache[i];
 109                 if (ntohs(ce->ce_flags) & ~CE_NAMEMASK) {
 110                         if (10 < ++funny) {
 111                                 fprintf(stderr, "...\n");
 112                                 break;
 113                         }
 114                         fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
 115                 }
 116         }
 117         if (funny)
 118                 die("git-write-tree: not able to write tree");
 119
 120         /* Also verify that the cache does not have path and path/file
 121          * at the same time.  At this point we know the cache has only
 122          * stage 0 entries.
 123          */
 124         funny = 0;
 125         for (i = 0; i < entries - 1; i++) {
 126                 /* path/file always comes after path because of the way
 127                  * the cache is sorted.  Also path can appear only once,
 128                  * which means conflicting one would immediately follow.
 129                  */
 130                 const char *this_name = active_cache[i]->name;
 131                 const char *next_name = active_cache[i+1]->name;
 132                 int this_len = strlen(this_name);
 133                 if (this_len < strlen(next_name) &&
 134                     strncmp(this_name, next_name, this_len) == 0 &&
 135                     next_name[this_len] == '/') {
 136                         if (10 < ++funny) {
 137                                 fprintf(stderr, "...\n");
 138                                 break;
 139                         }
 140                         fprintf(stderr, "You have both %s and %s\n",
 141                                 this_name, next_name);
 142                 }
 143         }
 144         if (funny)
 145                 die("git-write-tree: not able to write tree");
 146
 147         /* Ok, write it out */
 148         if (write_tree(active_cache, entries, "", 0, sha1) != entries)
 149                 die("git-write-tree: internal error");
 150         printf("%s\n", sha1_to_hex(sha1));
 151         return 0;
 152 }