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 "alloc.h"
   8 #include "gettext.h"
   9 #include "hex.h"
  10 #include "quote.h"
  11 #include "tree.h"
  12 #include "parse-options.h"
  13 #include "object-store.h"
  14
  15 static struct treeent {
  16         unsigned mode;
  17         struct object_id oid;
  18         int len;
  19         char name[FLEX_ARRAY];
  20 } **entries;
  21 static int alloc, used;
  22
  23 static void append_to_tree(unsigned mode, struct object_id *oid, char *path)
  24 {
  25         struct treeent *ent;
  26         size_t len = strlen(path);
  27         if (strchr(path, '/'))
  28                 die("path %s contains slash", path);
  29
  30         FLEX_ALLOC_MEM(ent, name, path, len);
  31         ent->mode = mode;
  32         ent->len = len;
  33         oidcpy(&ent->oid, oid);
  34
  35         ALLOC_GROW(entries, used + 1, alloc);
  36         entries[used++] = ent;
  37 }
  38
  39 static int ent_compare(const void *a_, const void *b_)
  40 {
  41         struct treeent *a = *(struct treeent **)a_;
  42         struct treeent *b = *(struct treeent **)b_;
  43         return base_name_compare(a->name, a->len, a->mode,
  44                                  b->name, b->len, b->mode);
  45 }
  46
  47 static void write_tree(struct object_id *oid)
  48 {
  49         struct strbuf buf;
  50         size_t size;
  51         int i;
  52
  53         QSORT(entries, used, ent_compare);
  54         for (size = i = 0; i < used; i++)
  55                 size += 32 + entries[i]->len;
  56
  57         strbuf_init(&buf, size);
  58         for (i = 0; i < used; i++) {
  59                 struct treeent *ent = entries[i];
  60                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  61                 strbuf_add(&buf, ent->oid.hash, the_hash_algo->rawsz);
  62         }
  63
  64         write_object_file(buf.buf, buf.len, OBJ_TREE, oid);
  65         strbuf_release(&buf);
  66 }
  67
  68 static const char *mktree_usage[] = {
  69         "git mktree [-z] [--missing] [--batch]",
  70         NULL
  71 };
  72
  73 static void mktree_line(char *buf, int nul_term_line, int allow_missing)
  74 {
  75         char *ptr, *ntr;
  76         const char *p;
  77         unsigned mode;
  78         enum object_type mode_type; /* object type derived from mode */
  79         enum object_type obj_type; /* object type derived from sha */
  80         struct object_info oi = OBJECT_INFO_INIT;
  81         char *path, *to_free = NULL;
  82         struct object_id oid;
  83
  84         ptr = buf;
  85         /*
  86          * Read non-recursive ls-tree output format:
  87          *     mode SP type SP sha1 TAB name
  88          */
  89         mode = strtoul(ptr, &ntr, 8);
  90         if (ptr == ntr || !ntr || *ntr != ' ')
  91                 die("input format error: %s", buf);
  92         ptr = ntr + 1; /* type */
  93         ntr = strchr(ptr, ' ');
  94         if (!ntr || parse_oid_hex(ntr + 1, &oid, &p) ||
  95             *p != '\t')
  96                 die("input format error: %s", buf);
  97
  98         /* It is perfectly normal if we do not have a commit from a submodule */
  99         if (S_ISGITLINK(mode))
 100                 allow_missing = 1;
 101
 102
 103         *ntr++ = 0; /* now at the beginning of SHA1 */
 104
 105         path = (char *)p + 1;  /* at the beginning of name */
 106         if (!nul_term_line && path[0] == '"') {
 107                 struct strbuf p_uq = STRBUF_INIT;
 108                 if (unquote_c_style(&p_uq, path, NULL))
 109                         die("invalid quoting");
 110                 path = to_free = strbuf_detach(&p_uq, NULL);
 111         }
 112
 113         /*
 114          * Object type is redundantly derivable three ways.
 115          * These should all agree.
 116          */
 117         mode_type = object_type(mode);
 118         if (mode_type != type_from_string(ptr)) {
 119                 die("entry '%s' object type (%s) doesn't match mode type (%s)",
 120                         path, ptr, type_name(mode_type));
 121         }
 122
 123         /* Check the type of object identified by oid without fetching objects */
 124         oi.typep = &obj_type;
 125         if (oid_object_info_extended(the_repository, &oid, &oi,
 126                                      OBJECT_INFO_LOOKUP_REPLACE |
 127                                      OBJECT_INFO_QUICK |
 128                                      OBJECT_INFO_SKIP_FETCH_OBJECT) < 0)
 129                 obj_type = -1;
 130
 131         if (obj_type < 0) {
 132                 if (allow_missing) {
 133                         ; /* no problem - missing objects are presumed to be of the right type */
 134                 } else {
 135                         die("entry '%s' object %s is unavailable", path, oid_to_hex(&oid));
 136                 }
 137         } else {
 138                 if (obj_type != mode_type) {
 139                         /*
 140                          * The object exists but is of the wrong type.
 141                          * This is a problem regardless of allow_missing
 142                          * because the new tree entry will never be correct.
 143                          */
 144                         die("entry '%s' object %s is a %s but specified type was (%s)",
 145                                 path, oid_to_hex(&oid), type_name(obj_type), type_name(mode_type));
 146                 }
 147         }
 148
 149         append_to_tree(mode, &oid, path);
 150         free(to_free);
 151 }
 152
 153 int cmd_mktree(int ac, const char **av, const char *prefix)
 154 {
 155         struct strbuf sb = STRBUF_INIT;
 156         struct object_id oid;
 157         int nul_term_line = 0;
 158         int allow_missing = 0;
 159         int is_batch_mode = 0;
 160         int got_eof = 0;
 161         strbuf_getline_fn getline_fn;
 162
 163         const struct option option[] = {
 164                 OPT_BOOL('z', NULL, &nul_term_line, N_("input is NUL terminated")),
 165                 OPT_SET_INT( 0 , "missing", &allow_missing, N_("allow missing objects"), 1),
 166                 OPT_SET_INT( 0 , "batch", &is_batch_mode, N_("allow creation of more than one tree"), 1),
 167                 OPT_END()
 168         };
 169
 170         ac = parse_options(ac, av, prefix, option, mktree_usage, 0);
 171         getline_fn = nul_term_line ? strbuf_getline_nul : strbuf_getline_lf;
 172
 173         while (!got_eof) {
 174                 while (1) {
 175                         if (getline_fn(&sb, stdin) == EOF) {
 176                                 got_eof = 1;
 177                                 break;
 178                         }
 179                         if (sb.buf[0] == '\0') {
 180                                 /* empty lines denote tree boundaries in batch mode */
 181                                 if (is_batch_mode)
 182                                         break;
 183                                 die("input format error: (blank line only valid in batch mode)");
 184                         }
 185                         mktree_line(sb.buf, nul_term_line, allow_missing);
 186                 }
 187                 if (is_batch_mode && got_eof && used < 1) {
 188                         /*
 189                          * Execution gets here if the last tree entry is terminated with a
 190                          * new-line.  The final new-line has been made optional to be
 191                          * consistent with the original non-batch behaviour of mktree.
 192                          */
 193                         ; /* skip creating an empty tree */
 194                 } else {
 195                         write_tree(&oid);
 196                         puts(oid_to_hex(&oid));
 197                         fflush(stdout);
 198                 }
 199                 used=0; /* reset tree entry buffer for re-use in batch mode */
 200         }
 201         strbuf_release(&sb);
 202         return 0;
 203 }