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         size_t len = strlen(path);
  23         if (strchr(path, '/'))
  24                 die("path %s contains slash", path);
  25
  26         FLEX_ALLOC_MEM(ent, name, path, len);
  27         ent->mode = mode;
  28         ent->len = len;
  29         hashcpy(ent->sha1, sha1);
  30
  31         ALLOC_GROW(entries, used + 1, alloc);
  32         entries[used++] = ent;
  33 }
  34
  35 static int ent_compare(const void *a_, const void *b_)
  36 {
  37         struct treeent *a = *(struct treeent **)a_;
  38         struct treeent *b = *(struct treeent **)b_;
  39         return base_name_compare(a->name, a->len, a->mode,
  40                                  b->name, b->len, b->mode);
  41 }
  42
  43 static void write_tree(unsigned char *sha1)
  44 {
  45         struct strbuf buf;
  46         size_t size;
  47         int i;
  48
  49         QSORT(entries, used, ent_compare);
  50         for (size = i = 0; i < used; i++)
  51                 size += 32 + entries[i]->len;
  52
  53         strbuf_init(&buf, size);
  54         for (i = 0; i < used; i++) {
  55                 struct treeent *ent = entries[i];
  56                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  57                 strbuf_add(&buf, ent->sha1, 20);
  58         }
  59
  60         write_sha1_file(buf.buf, buf.len, tree_type, sha1);
  61         strbuf_release(&buf);
  62 }
  63
  64 static const char *mktree_usage[] = {
  65         N_("git mktree [-z] [--missing] [--batch]"),
  66         NULL
  67 };
  68
  69 static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_missing)
  70 {
  71         char *ptr, *ntr;
  72         unsigned mode;
  73         enum object_type mode_type; /* object type derived from mode */
  74         enum object_type obj_type; /* object type derived from sha */
  75         char *path, *to_free = NULL;
  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
  98         *ntr++ = 0; /* now at the beginning of SHA1 */
  99
 100         path = ntr + 41;  /* at the beginning of name */
 101         if (!nul_term_line && path[0] == '"') {
 102                 struct strbuf p_uq = STRBUF_INIT;
 103                 if (unquote_c_style(&p_uq, path, NULL))
 104                         die("invalid quoting");
 105                 path = to_free = strbuf_detach(&p_uq, NULL);
 106         }
 107
 108         /*
 109          * Object type is redundantly derivable three ways.
 110          * These should all agree.
 111          */
 112         mode_type = object_type(mode);
 113         if (mode_type != type_from_string(ptr)) {
 114                 die("entry '%s' object type (%s) doesn't match mode type (%s)",
 115                         path, ptr, typename(mode_type));
 116         }
 117
 118         /* Check the type of object identified by sha1 */
 119         obj_type = sha1_object_info(sha1, NULL);
 120         if (obj_type < 0) {
 121                 if (allow_missing) {
 122                         ; /* no problem - missing objects are presumed to be of the right type */
 123                 } else {
 124                         die("entry '%s' object %s is unavailable", path, sha1_to_hex(sha1));
 125                 }
 126         } else {
 127                 if (obj_type != mode_type) {
 128                         /*
 129                          * The object exists but is of the wrong type.
 130                          * This is a problem regardless of allow_missing
 131                          * because the new tree entry will never be correct.
 132                          */
 133                         die("entry '%s' object %s is a %s but specified type was (%s)",
 134                                 path, sha1_to_hex(sha1), typename(obj_type), typename(mode_type));
 135                 }
 136         }
 137
 138         append_to_tree(mode, sha1, path);
 139         free(to_free);
 140 }
 141
 142 int cmd_mktree(int ac, const char **av, const char *prefix)
 143 {
 144         struct strbuf sb = STRBUF_INIT;
 145         unsigned char sha1[20];
 146         int nul_term_line = 0;
 147         int allow_missing = 0;
 148         int is_batch_mode = 0;
 149         int got_eof = 0;
 150         strbuf_getline_fn getline_fn;
 151
 152         const struct option option[] = {
 153                 OPT_BOOL('z', NULL, &nul_term_line, N_("input is NUL terminated")),
 154                 OPT_SET_INT( 0 , "missing", &allow_missing, N_("allow missing objects"), 1),
 155                 OPT_SET_INT( 0 , "batch", &is_batch_mode, N_("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         getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
 161
 162         while (!got_eof) {
 163                 while (1) {
 164                         if (getline_fn(&sb, stdin) == EOF) {
 165                                 got_eof = 1;
 166                                 break;
 167                         }
 168                         if (sb.buf[0] == '\0') {
 169                                 /* empty lines denote tree boundaries in batch mode */
 170                                 if (is_batch_mode)
 171                                         break;
 172                                 die("input format error: (blank line only valid in batch mode)");
 173                         }
 174                         mktree_line(sb.buf, sb.len, nul_term_line, allow_missing);
 175                 }
 176                 if (is_batch_mode && got_eof && used < 1) {
 177                         /*
 178                          * Execution gets here if the last tree entry is terminated with a
 179                          * new-line.  The final new-line has been made optional to be
 180                          * consistent with the original non-batch behaviour of mktree.
 181                          */
 182                         ; /* skip creating an empty tree */
 183                 } else {
 184                         write_tree(sha1);
 185                         puts(sha1_to_hex(sha1));
 186                         fflush(stdout);
 187                 }
 188                 used=0; /* reset tree entry buffer for re-use in batch mode */
 189         }
 190         strbuf_release(&sb);
 191         exit(0);
 192 }