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 #include "object-store.h"
  11
  12 static struct treeent {
  13         unsigned mode;
  14         struct object_id oid;
  15         int len;
  16         char name[FLEX_ARRAY];
  17 } **entries;
  18 static int alloc, used;
  19
  20 static void append_to_tree(unsigned mode, struct object_id *oid, char *path)
  21 {
  22         struct treeent *ent;
  23         size_t len = strlen(path);
  24         if (strchr(path, '/'))
  25                 die("path %s contains slash", path);
  26
  27         FLEX_ALLOC_MEM(ent, name, path, len);
  28         ent->mode = mode;
  29         ent->len = len;
  30         oidcpy(&ent->oid, oid);
  31
  32         ALLOC_GROW(entries, used + 1, alloc);
  33         entries[used++] = ent;
  34 }
  35
  36 static int ent_compare(const void *a_, const void *b_)
  37 {
  38         struct treeent *a = *(struct treeent **)a_;
  39         struct treeent *b = *(struct treeent **)b_;
  40         return base_name_compare(a->name, a->len, a->mode,
  41                                  b->name, b->len, b->mode);
  42 }
  43
  44 static void write_tree(struct object_id *oid)
  45 {
  46         struct strbuf buf;
  47         size_t size;
  48         int i;
  49
  50         QSORT(entries, used, ent_compare);
  51         for (size = i = 0; i < used; i++)
  52                 size += 32 + entries[i]->len;
  53
  54         strbuf_init(&buf, size);
  55         for (i = 0; i < used; i++) {
  56                 struct treeent *ent = entries[i];
  57                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  58                 strbuf_add(&buf, ent->oid.hash, the_hash_algo->rawsz);
  59         }
  60
  61         write_object_file(buf.buf, buf.len, tree_type, oid);
  62         strbuf_release(&buf);
  63 }
  64
  65 static const char *mktree_usage[] = {
  66         N_("git mktree [-z] [--missing] [--batch]"),
  67         NULL
  68 };
  69
  70 static void mktree_line(char *buf, size_t len, int nul_term_line, int allow_missing)
  71 {
  72         char *ptr, *ntr;
  73         const char *p;
  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, *to_free = NULL;
  78         struct object_id oid;
  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 || parse_oid_hex(ntr + 1, &oid, &p) ||
  91             *p != '\t')
  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 (!nul_term_line && path[0] == '"') {
 103                 struct strbuf p_uq = STRBUF_INIT;
 104                 if (unquote_c_style(&p_uq, path, NULL))
 105                         die("invalid quoting");
 106                 path = to_free = 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, type_name(mode_type));
 117         }
 118
 119         /* Check the type of object identified by sha1 */
 120         obj_type = oid_object_info(the_repository, &oid, 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, oid_to_hex(&oid));
 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, oid_to_hex(&oid), type_name(obj_type), type_name(mode_type));
 136                 }
 137         }
 138
 139         append_to_tree(mode, &oid, path);
 140         free(to_free);
 141 }
 142
 143 int cmd_mktree(int ac, const char **av, const char *prefix)
 144 {
 145         struct strbuf sb = STRBUF_INIT;
 146         struct object_id oid;
 147         int nul_term_line = 0;
 148         int allow_missing = 0;
 149         int is_batch_mode = 0;
 150         int got_eof = 0;
 151         strbuf_getline_fn getline_fn;
 152
 153         const struct option option[] = {
 154                 OPT_BOOL('z', NULL, &nul_term_line, N_("input is NUL terminated")),
 155                 OPT_SET_INT( 0 , "missing", &allow_missing, N_("allow missing objects"), 1),
 156                 OPT_SET_INT( 0 , "batch", &is_batch_mode, N_("allow creation of more than one tree"), 1),
 157                 OPT_END()
 158         };
 159
 160         ac = parse_options(ac, av, prefix, option, mktree_usage, 0);
 161         getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
 162
 163         while (!got_eof) {
 164                 while (1) {
 165                         if (getline_fn(&sb, stdin) == EOF) {
 166                                 got_eof = 1;
 167                                 break;
 168                         }
 169                         if (sb.buf[0] == '\0') {
 170                                 /* empty lines denote tree boundaries in batch mode */
 171                                 if (is_batch_mode)
 172                                         break;
 173                                 die("input format error: (blank line only valid in batch mode)");
 174                         }
 175                         mktree_line(sb.buf, sb.len, nul_term_line, allow_missing);
 176                 }
 177                 if (is_batch_mode && got_eof && used < 1) {
 178                         /*
 179                          * Execution gets here if the last tree entry is terminated with a
 180                          * new-line.  The final new-line has been made optional to be
 181                          * consistent with the original non-batch behaviour of mktree.
 182                          */
 183                         ; /* skip creating an empty tree */
 184                 } else {
 185                         write_tree(&oid);
 186                         puts(oid_to_hex(&oid));
 187                         fflush(stdout);
 188                 }
 189                 used=0; /* reset tree entry buffer for re-use in batch mode */
 190         }
 191         strbuf_release(&sb);
 192         exit(0);
 193 }