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         hashcpy(ent->sha1, sha1);
  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         struct strbuf buf;
  48         size_t size;
  49         int i;
  50
  51         qsort(entries, used, sizeof(*entries), ent_compare);
  52         for (size = i = 0; i < used; i++)
  53                 size += 32 + entries[i]->len;
  54
  55         strbuf_init(&buf, size);
  56         for (i = 0; i < used; i++) {
  57                 struct treeent *ent = entries[i];
  58                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  59                 strbuf_add(&buf, ent->sha1, 20);
  60         }
  61
  62         write_sha1_file(buf.buf, buf.len, tree_type, sha1);
  63 }
  64
  65 static const char mktree_usage[] = "git-mktree [-z]";
  66
  67 int main(int ac, char **av)
  68 {
  69         struct strbuf sb;
  70         unsigned char sha1[20];
  71         int line_termination = '\n';
  72
  73         setup_git_directory();
  74
  75         while ((1 < ac) && av[1][0] == '-') {
  76                 char *arg = av[1];
  77                 if (!strcmp("-z", arg))
  78                         line_termination = 0;
  79                 else
  80                         usage(mktree_usage);
  81                 ac--;
  82                 av++;
  83         }
  84
  85         strbuf_init(&sb, 0);
  86         while (1) {
  87                 char *ptr, *ntr;
  88                 unsigned mode;
  89                 enum object_type type;
  90                 char *path;
  91
  92                 read_line(&sb, stdin, line_termination);
  93                 if (sb.eof)
  94                         break;
  95                 ptr = sb.buf;
  96                 /* Input is non-recursive ls-tree output format
  97                  * mode SP type SP sha1 TAB name
  98                  */
  99                 mode = strtoul(ptr, &ntr, 8);
 100                 if (ptr == ntr || !ntr || *ntr != ' ')
 101                         die("input format error: %s", sb.buf);
 102                 ptr = ntr + 1; /* type */
 103                 ntr = strchr(ptr, ' ');
 104                 if (!ntr || sb.buf + sb.len <= ntr + 40 ||
 105                     ntr[41] != '\t' ||
 106                     get_sha1_hex(ntr + 1, sha1))
 107                         die("input format error: %s", sb.buf);
 108                 type = sha1_object_info(sha1, NULL);
 109                 if (type < 0)
 110                         die("object %s unavailable", sha1_to_hex(sha1));
 111                 *ntr++ = 0; /* now at the beginning of SHA1 */
 112                 if (type != type_from_string(ptr))
 113                         die("object type %s mismatch (%s)", ptr, typename(type));
 114                 ntr += 41; /* at the beginning of name */
 115                 if (line_termination && ntr[0] == '"')
 116                         path = unquote_c_style(ntr, NULL);
 117                 else
 118                         path = ntr;
 119
 120                 append_to_tree(mode, sha1, path);
 121
 122                 if (path != ntr)
 123                         free(path);
 124         }
 125         write_tree(sha1);
 126         puts(sha1_to_hex(sha1));
 127         exit(0);
 128 }