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