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         strbuf_init(&buf);
  55         strbuf_grow(&buf, size);
  56
  57         for (i = 0; i < used; i++) {
  58                 struct treeent *ent = entries[i];
  59                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  60                 strbuf_add(&buf, ent->sha1, 20);
  61         }
  62
  63         write_sha1_file(buf.buf, buf.len, tree_type, sha1);
  64 }
  65
  66 static const char mktree_usage[] = "git-mktree [-z]";
  67
  68 int main(int ac, char **av)
  69 {
  70         struct strbuf sb;
  71         unsigned char sha1[20];
  72         int line_termination = '\n';
  73
  74         setup_git_directory();
  75
  76         while ((1 < ac) && av[1][0] == '-') {
  77                 char *arg = av[1];
  78                 if (!strcmp("-z", arg))
  79                         line_termination = 0;
  80                 else
  81                         usage(mktree_usage);
  82                 ac--;
  83                 av++;
  84         }
  85
  86         strbuf_init(&sb);
  87         while (1) {
  88                 char *ptr, *ntr;
  89                 unsigned mode;
  90                 enum object_type type;
  91                 char *path;
  92
  93                 read_line(&sb, stdin, line_termination);
  94                 if (sb.eof)
  95                         break;
  96                 ptr = sb.buf;
  97                 /* Input is non-recursive ls-tree output format
  98                  * mode SP type SP sha1 TAB name
  99                  */
 100                 mode = strtoul(ptr, &ntr, 8);
 101                 if (ptr == ntr || !ntr || *ntr != ' ')
 102                         die("input format error: %s", sb.buf);
 103                 ptr = ntr + 1; /* type */
 104                 ntr = strchr(ptr, ' ');
 105                 if (!ntr || sb.buf + sb.len <= ntr + 40 ||
 106                     ntr[41] != '\t' ||
 107                     get_sha1_hex(ntr + 1, sha1))
 108                         die("input format error: %s", sb.buf);
 109                 type = sha1_object_info(sha1, NULL);
 110                 if (type < 0)
 111                         die("object %s unavailable", sha1_to_hex(sha1));
 112                 *ntr++ = 0; /* now at the beginning of SHA1 */
 113                 if (type != type_from_string(ptr))
 114                         die("object type %s mismatch (%s)", ptr, typename(type));
 115                 ntr += 41; /* at the beginning of name */
 116                 if (line_termination && ntr[0] == '"')
 117                         path = unquote_c_style(ntr, NULL);
 118                 else
 119                         path = ntr;
 120
 121                 append_to_tree(mode, sha1, path);
 122
 123                 if (path != ntr)
 124                         free(path);
 125         }
 126         write_tree(sha1);
 127         puts(sha1_to_hex(sha1));
 128         exit(0);
 129 }