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