builtin-mktree.c

   1 /*
   2  * GIT - the stupid content tracker
   3  *
   4  * Copyright (c) Junio C Hamano, 2006, 2009
   5  */
   6 #include "builtin.h"
   7 #include "quote.h"
   8 #include "tree.h"
   9 #include "parse-options.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[] = {
  66         "git mktree [-z] [--missing]",
  67         NULL
  68 };
  69
  70 static void mktree_line(char *buf, size_t len, int line_termination, int allow_missing)
  71 {
  72         char *ptr, *ntr;
  73         unsigned mode;
  74         enum object_type type;
  75         char *path;
  76         unsigned char sha1[20];
  77
  78         ptr = buf;
  79         /*
  80          * Read non-recursive ls-tree output format:
  81          *     mode SP type SP sha1 TAB name
  82          */
  83         mode = strtoul(ptr, &ntr, 8);
  84         if (ptr == ntr || !ntr || *ntr != ' ')
  85                 die("input format error: %s", buf);
  86         ptr = ntr + 1; /* type */
  87         ntr = strchr(ptr, ' ');
  88         if (!ntr || buf + len <= ntr + 40 ||
  89             ntr[41] != '\t' ||
  90             get_sha1_hex(ntr + 1, sha1))
  91                 die("input format error: %s", buf);
  92
  93         /* It is perfectly normal if we do not have a commit from a submodule */
  94         if (S_ISGITLINK(mode))
  95                 allow_missing = 1;
  96
  97         if (!allow_missing)
  98                 type = sha1_object_info(sha1, NULL);
  99         else
 100                 type = object_type(mode);
 101
 102         if (type < 0)
 103                 die("object %s unavailable", sha1_to_hex(sha1));
 104
 105         *ntr++ = 0; /* now at the beginning of SHA1 */
 106         if (type != type_from_string(ptr))
 107                 die("object type %s mismatch (%s)", ptr, typename(type));
 108
 109         path = ntr + 41;  /* at the beginning of name */
 110         if (line_termination && path[0] == '"') {
 111                 struct strbuf p_uq = STRBUF_INIT;
 112                 if (unquote_c_style(&p_uq, path, NULL))
 113                         die("invalid quoting");
 114                 path = strbuf_detach(&p_uq, NULL);
 115         }
 116         append_to_tree(mode, sha1, path);
 117 }
 118
 119 int cmd_mktree(int ac, const char **av, const char *prefix)
 120 {
 121         struct strbuf sb = STRBUF_INIT;
 122         unsigned char sha1[20];
 123         int line_termination = '\n';
 124         int allow_missing = 0;
 125         const struct option option[] = {
 126                 OPT_SET_INT('z', NULL, &line_termination, "input is NUL terminated", '\0'),
 127                 OPT_SET_INT( 0 , "missing", &allow_missing, "allow missing objects", 1),
 128                 OPT_END()
 129         };
 130
 131         ac = parse_options(ac, av, option, mktree_usage, 0);
 132
 133         while (strbuf_getline(&sb, stdin, line_termination) != EOF)
 134                 mktree_line(sb.buf, sb.len, line_termination, allow_missing);
 135
 136         strbuf_release(&sb);
 137
 138         write_tree(sha1);
 139         puts(sha1_to_hex(sha1));
 140         exit(0);
 141 }