write-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7 #include "tree.h"
   8
   9 static int missing_ok = 0;
  10
  11 static int check_valid_sha1(unsigned char *sha1)
  12 {
  13         int ret;
  14
  15         /* If we were anal, we'd check that the sha1 of the contents actually matches */
  16         ret = has_sha1_file(sha1);
  17         if (ret == 0)
  18                 perror(sha1_file_name(sha1));
  19         return ret ? 0 : -1;
  20 }
  21
  22 static int write_tree(struct cache_entry **cachep, int maxentries, const char *base, int baselen, unsigned char *returnsha1)
  23 {
  24         unsigned char subdir_sha1[20];
  25         unsigned long size, offset;
  26         char *buffer;
  27         int nr;
  28
  29         /* Guess at some random initial size */
  30         size = 8192;
  31         buffer = xmalloc(size);
  32         offset = 0;
  33
  34         nr = 0;
  35         while (nr < maxentries) {
  36                 struct cache_entry *ce = cachep[nr];
  37                 const char *pathname = ce->name, *filename, *dirname;
  38                 int pathlen = ce_namelen(ce), entrylen;
  39                 unsigned char *sha1;
  40                 unsigned int mode;
  41
  42                 /* Did we hit the end of the directory? Return how many we wrote */
  43                 if (baselen >= pathlen || memcmp(base, pathname, baselen))
  44                         break;
  45
  46                 sha1 = ce->sha1;
  47                 mode = ntohl(ce->ce_mode);
  48
  49                 /* Do we have _further_ subdirectories? */
  50                 filename = pathname + baselen;
  51                 dirname = strchr(filename, '/');
  52                 if (dirname) {
  53                         int subdir_written;
  54
  55                         subdir_written = write_tree(cachep + nr, maxentries - nr, pathname, dirname-pathname+1, subdir_sha1);
  56                         nr += subdir_written;
  57
  58                         /* Now we need to write out the directory entry into this tree.. */
  59                         mode = S_IFDIR;
  60                         pathlen = dirname - pathname;
  61
  62                         /* ..but the directory entry doesn't count towards the total count */
  63                         nr--;
  64                         sha1 = subdir_sha1;
  65                 }
  66
  67                 if (!missing_ok && check_valid_sha1(sha1) < 0)
  68                         exit(1);
  69
  70                 entrylen = pathlen - baselen;
  71                 if (offset + entrylen + 100 > size) {
  72                         size = alloc_nr(offset + entrylen + 100);
  73                         buffer = xrealloc(buffer, size);
  74                 }
  75                 offset += sprintf(buffer + offset, "%o %.*s", mode, entrylen, filename);
  76                 buffer[offset++] = 0;
  77                 memcpy(buffer + offset, sha1, 20);
  78                 offset += 20;
  79                 nr++;
  80         }
  81
  82         write_sha1_file(buffer, offset, tree_type, returnsha1);
  83         free(buffer);
  84         return nr;
  85 }
  86
  87 static const char write_tree_usage[] = "git-write-tree [--missing-ok]";
  88
  89 int main(int argc, char **argv)
  90 {
  91         int i, funny;
  92         int entries;
  93         unsigned char sha1[20];
  94
  95         setup_git_directory();
  96
  97         entries = read_cache();
  98         if (argc == 2) {
  99                 if (!strcmp(argv[1], "--missing-ok"))
 100                         missing_ok = 1;
 101                 else
 102                         die(write_tree_usage);
 103         }
 104
 105         if (argc > 2)
 106                 die("too many options");
 107
 108         if (entries < 0)
 109                 die("git-write-tree: error reading cache");
 110
 111         /* Verify that the tree is merged */
 112         funny = 0;
 113         for (i = 0; i < entries; i++) {
 114                 struct cache_entry *ce = active_cache[i];
 115                 if (ce_stage(ce)) {
 116                         if (10 < ++funny) {
 117                                 fprintf(stderr, "...\n");
 118                                 break;
 119                         }
 120                         fprintf(stderr, "%s: unmerged (%s)\n", ce->name, sha1_to_hex(ce->sha1));
 121                 }
 122         }
 123         if (funny)
 124                 die("git-write-tree: not able to write tree");
 125
 126         /* Also verify that the cache does not have path and path/file
 127          * at the same time.  At this point we know the cache has only
 128          * stage 0 entries.
 129          */
 130         funny = 0;
 131         for (i = 0; i < entries - 1; i++) {
 132                 /* path/file always comes after path because of the way
 133                  * the cache is sorted.  Also path can appear only once,
 134                  * which means conflicting one would immediately follow.
 135                  */
 136                 const char *this_name = active_cache[i]->name;
 137                 const char *next_name = active_cache[i+1]->name;
 138                 int this_len = strlen(this_name);
 139                 if (this_len < strlen(next_name) &&
 140                     strncmp(this_name, next_name, this_len) == 0 &&
 141                     next_name[this_len] == '/') {
 142                         if (10 < ++funny) {
 143                                 fprintf(stderr, "...\n");
 144                                 break;
 145                         }
 146                         fprintf(stderr, "You have both %s and %s\n",
 147                                 this_name, next_name);
 148                 }
 149         }
 150         if (funny)
 151                 die("git-write-tree: not able to write tree");
 152
 153         /* Ok, write it out */
 154         if (write_tree(active_cache, entries, "", 0, sha1) != entries)
 155                 die("git-write-tree: internal error");
 156         printf("%s\n", sha1_to_hex(sha1));
 157         return 0;
 158 }