builtin-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         char *buffer;
  48         unsigned long size, offset;
  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         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                 hashcpy((unsigned char*)buffer + offset, ent->sha1);
  68                 offset += 20;
  69         }
  70         write_sha1_file(buffer, offset, tree_type, sha1);
  71 }
  72
  73 static const char mktree_usage[] = "git-mktree [-z]";
  74
  75 int cmd_mktree(int ac, const char **av, const char *prefix)
  76 {
  77         struct strbuf sb;
  78         unsigned char sha1[20];
  79         int line_termination = '\n';
  80
  81         while ((1 < ac) && av[1][0] == '-') {
  82                 char *arg = av[1];
  83                 if (!strcmp("-z", arg))
  84                         line_termination = 0;
  85                 else
  86                         usage(mktree_usage);
  87                 ac--;
  88                 av++;
  89         }
  90
  91         strbuf_init(&sb);
  92         while (1) {
  93                 int len;
  94                 char *ptr, *ntr;
  95                 unsigned mode;
  96                 enum object_type type;
  97                 char *path;
  98
  99                 read_line(&sb, stdin, line_termination);
 100                 if (sb.eof)
 101                         break;
 102                 len = sb.len;
 103                 ptr = sb.buf;
 104                 /* Input is non-recursive ls-tree output format
 105                  * mode SP type SP sha1 TAB name
 106                  */
 107                 mode = strtoul(ptr, &ntr, 8);
 108                 if (ptr == ntr || !ntr || *ntr != ' ')
 109                         die("input format error: %s", sb.buf);
 110                 ptr = ntr + 1; /* type */
 111                 ntr = strchr(ptr, ' ');
 112                 if (!ntr || sb.buf + len <= ntr + 41 ||
 113                     ntr[41] != '\t' ||
 114                     get_sha1_hex(ntr + 1, sha1))
 115                         die("input format error: %s", sb.buf);
 116                 type = sha1_object_info(sha1, NULL);
 117                 if (type < 0)
 118                         die("object %s unavailable", sha1_to_hex(sha1));
 119                 *ntr++ = 0; /* now at the beginning of SHA1 */
 120                 if (type != type_from_string(ptr))
 121                         die("object type %s mismatch (%s)", ptr, typename(type));
 122                 ntr += 41; /* at the beginning of name */
 123                 if (line_termination && ntr[0] == '"')
 124                         path = unquote_c_style(ntr, NULL);
 125                 else
 126                         path = ntr;
 127
 128                 append_to_tree(mode, sha1, path);
 129
 130                 if (path != ntr)
 131                         free(path);
 132         }
 133         write_tree(sha1);
 134         puts(sha1_to_hex(sha1));
 135         exit(0);
 136 }