mktree.c

   1 /*
   2  * GIT - the stupid content tracker
   3  *
   4  * Copyright (c) Junio C Hamano, 2006
   5  */
   6 #include "cache.h"
   7 #include "strbuf.h"
   8 #include "quote.h"
   9 #include "tree.h"
  10
  11 static struct treeent {
  12         unsigned mode;
  13         unsigned char sha1[20];
  14         int len;
  15         char name[FLEX_ARRAY];
  16 } **entries;
  17 static int alloc, used;
  18
  19 static void append_to_tree(unsigned mode, unsigned char *sha1, char *path)
  20 {
  21         struct treeent *ent;
  22         int len = strlen(path);
  23         if (strchr(path, '/'))
  24                 die("path %s contains slash", path);
  25
  26         if (alloc <= used) {
  27                 alloc = alloc_nr(used);
  28                 entries = xrealloc(entries, sizeof(*entries) * alloc);
  29         }
  30         ent = entries[used++] = xmalloc(sizeof(**entries) + len + 1);
  31         ent->mode = mode;
  32         ent->len = len;
  33         memcpy(ent->sha1, sha1, 20);
  34         memcpy(ent->name, path, len+1);
  35 }
  36
  37 static int ent_compare(const void *a_, const void *b_)
  38 {
  39         struct treeent *a = *(struct treeent **)a_;
  40         struct treeent *b = *(struct treeent **)b_;
  41         return base_name_compare(a->name, a->len, a->mode,
  42                                  b->name, b->len, b->mode);
  43 }
  44
  45 static void write_tree(unsigned char *sha1)
  46 {
  47         char *buffer;
  48         unsigned long size, offset;
  49         int i;
  50
  51         qsort(entries, used, sizeof(*entries), ent_compare);
  52         size = 100;
  53         for (size = i = 0; i < used; i++)
  54                 size += 32 + entries[i]->len;
  55         buffer = xmalloc(size);
  56         offset = 0;
  57
  58         for (i = 0; i < used; i++) {
  59                 struct treeent *ent = entries[i];
  60
  61                 if (offset + ent->len + 100 < size) {
  62                         size = alloc_nr(offset + ent->len + 100);
  63                         buffer = xrealloc(buffer, size);
  64                 }
  65                 offset += sprintf(buffer + offset, "%o ", ent->mode);
  66                 offset += sprintf(buffer + offset, "%s", ent->name);
  67                 buffer[offset++] = 0;
  68                 memcpy(buffer + offset, ent->sha1, 20);
  69                 offset += 20;
  70         }
  71         write_sha1_file(buffer, offset, tree_type, sha1);
  72 }
  73
  74 static const char mktree_usage[] = "mktree [-z]";
  75
  76 int main(int ac, char **av)
  77 {
  78         struct strbuf sb;
  79         unsigned char sha1[20];
  80         int line_termination = '\n';
  81
  82         setup_git_directory();
  83
  84         while ((1 < ac) && av[1][0] == '-') {
  85                 char *arg = av[1];
  86                 if (!strcmp("-z", arg))
  87                         line_termination = 0;
  88                 else
  89                         usage(mktree_usage);
  90                 ac--;
  91                 av++;
  92         }
  93
  94         strbuf_init(&sb);
  95         while (1) {
  96                 int len;
  97                 char *ptr, *ntr;
  98                 unsigned mode;
  99                 char type[20];
 100                 char *path;
 101
 102                 read_line(&sb, stdin, line_termination);
 103                 if (sb.eof)
 104                         break;
 105                 len = sb.len;
 106                 ptr = sb.buf;
 107                 /* Input is non-recursive ls-tree output format
 108                  * mode SP type SP sha1 TAB name
 109                  */
 110                 mode = strtoul(ptr, &ntr, 8);
 111                 if (ptr == ntr || !ntr || *ntr != ' ')
 112                         die("input format error: %s", sb.buf);
 113                 ptr = ntr + 1; /* type */
 114                 ntr = strchr(ptr, ' ');
 115                 if (!ntr || sb.buf + len <= ntr + 41 ||
 116                     ntr[41] != '\t' ||
 117                     get_sha1_hex(ntr + 1, sha1))
 118                         die("input format error: %s", sb.buf);
 119                 if (sha1_object_info(sha1, type, NULL))
 120                         die("object %s unavailable", sha1_to_hex(sha1));
 121                 *ntr++ = 0; /* now at the beginning of SHA1 */
 122                 if (strcmp(ptr, type))
 123                         die("object type %s mismatch (%s)", ptr, type);
 124                 ntr += 41; /* at the beginning of name */
 125                 if (line_termination && ntr[0] == '"')
 126                         path = unquote_c_style(ntr, NULL);
 127                 else
 128                         path = ntr;
 129
 130                 append_to_tree(mode, sha1, path);
 131
 132                 if (path != ntr)
 133                         free(path);
 134         }
 135         write_tree(sha1);
 136         puts(sha1_to_hex(sha1));
 137         exit(0);
 138 }