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         strbuf_release(&buf);
  64 }
  65
  66 static const char *mktree_usage[] = {
  67         "git mktree [-z] [--missing] [--batch]",
  68         NULL
  69 };
  70
  71 static void mktree_line(char *buf, size_t len, int line_termination, int allow_missing)
  72 {
  73         char *ptr, *ntr;
  74         unsigned mode;
  75         enum object_type mode_type; /* object type derived from mode */
  76         enum object_type obj_type; /* object type derived from sha */
  77         char *path;
  78         unsigned char sha1[20];
  79
  80         ptr = buf;
  81         /*
  82          * Read non-recursive ls-tree output format:
  83          *     mode SP type SP sha1 TAB name
  84          */
  85         mode = strtoul(ptr, &ntr, 8);
  86         if (ptr == ntr || !ntr || *ntr != ' ')
  87                 die("input format error: %s", buf);
  88         ptr = ntr + 1; /* type */
  89         ntr = strchr(ptr, ' ');
  90         if (!ntr || buf + len <= ntr + 40 ||
  91             ntr[41] != '\t' ||
  92             get_sha1_hex(ntr + 1, sha1))
  93                 die("input format error: %s", buf);
  94
  95         /* It is perfectly normal if we do not have a commit from a submodule */
  96         if (S_ISGITLINK(mode))
  97                 allow_missing = 1;
  98
  99
 100         *ntr++ = 0; /* now at the beginning of SHA1 */
 101
 102         path = ntr + 41;  /* at the beginning of name */
 103         if (line_termination && path[0] == '"') {
 104                 struct strbuf p_uq = STRBUF_INIT;
 105                 if (unquote_c_style(&p_uq, path, NULL))
 106                         die("invalid quoting");
 107                 path = strbuf_detach(&p_uq, NULL);
 108         }
 109
 110         /*
 111          * Object type is redundantly derivable three ways.
 112          * These should all agree.
 113          */
 114         mode_type = object_type(mode);
 115         if (mode_type != type_from_string(ptr)) {
 116                 die("entry '%s' object type (%s) doesn't match mode type (%s)",
 117                         path, ptr, typename(mode_type));
 118         }
 119
 120         /* Check the type of object identified by sha1 */
 121         obj_type = sha1_object_info(sha1, NULL);
 122         if (obj_type < 0) {
 123                 if (allow_missing) {
 124                         ; /* no problem - missing objects are presumed to be of the right type */
 125                 } else {
 126                         die("entry '%s' object %s is unavailable", path, sha1_to_hex(sha1));
 127                 }
 128         } else {
 129                 if (obj_type != mode_type) {
 130                         /*
 131                          * The object exists but is of the wrong type.
 132                          * This is a problem regardless of allow_missing
 133                          * because the new tree entry will never be correct.
 134                          */
 135                         die("entry '%s' object %s is a %s but specified type was (%s)",
 136                                 path, sha1_to_hex(sha1), typename(obj_type), typename(mode_type));
 137                 }
 138         }
 139
 140         append_to_tree(mode, sha1, path);
 141 }
 142
 143 int cmd_mktree(int ac, const char **av, const char *prefix)
 144 {
 145         struct strbuf sb = STRBUF_INIT;
 146         unsigned char sha1[20];
 147         int line_termination = '\n';
 148         int allow_missing = 0;
 149         int is_batch_mode = 0;
 150         int got_eof = 0;
 151
 152         const struct option option[] = {
 153                 OPT_SET_INT('z', NULL, &line_termination, "input is NUL terminated", '\0'),
 154                 OPT_SET_INT( 0 , "missing", &allow_missing, "allow missing objects", 1),
 155                 OPT_SET_INT( 0 , "batch", &is_batch_mode, "allow creation of more than one tree", 1),
 156                 OPT_END()
 157         };
 158
 159         ac = parse_options(ac, av, prefix, option, mktree_usage, 0);
 160
 161         while (!got_eof) {
 162                 while (1) {
 163                         if (strbuf_getline(&sb, stdin, line_termination) == EOF) {
 164                                 got_eof = 1;
 165                                 break;
 166                         }
 167                         if (sb.buf[0] == '\0') {
 168                                 /* empty lines denote tree boundaries in batch mode */
 169                                 if (is_batch_mode)
 170                                         break;
 171                                 die("input format error: (blank line only valid in batch mode)");
 172                         }
 173                         mktree_line(sb.buf, sb.len, line_termination, allow_missing);
 174                 }
 175                 if (is_batch_mode && got_eof && used < 1) {
 176                         /*
 177                          * Execution gets here if the last tree entry is terminated with a
 178                          * new-line.  The final new-line has been made optional to be
 179                          * consistent with the original non-batch behaviour of mktree.
 180                          */
 181                         ; /* skip creating an empty tree */
 182                 } else {
 183                         write_tree(sha1);
 184                         puts(sha1_to_hex(sha1));
 185                         fflush(stdout);
 186                 }
 187                 used=0; /* reset tree entry buffer for re-use in batch mode */
 188         }
 189         strbuf_release(&sb);
 190         exit(0);
 191 }