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         ALLOC_GROW(entries, used + 1, alloc);
  27         ent = entries[used++] = xmalloc(sizeof(**entries) + len + 1);
  28         ent->mode = mode;
  29         ent->len = len;
  30         hashcpy(ent->sha1, sha1);
  31         memcpy(ent->name, path, len+1);
  32 }
  33
  34 static int ent_compare(const void *a_, const void *b_)
  35 {
  36         struct treeent *a = *(struct treeent **)a_;
  37         struct treeent *b = *(struct treeent **)b_;
  38         return base_name_compare(a->name, a->len, a->mode,
  39                                  b->name, b->len, b->mode);
  40 }
  41
  42 static void write_tree(unsigned char *sha1)
  43 {
  44         struct strbuf buf;
  45         size_t size;
  46         int i;
  47
  48         qsort(entries, used, sizeof(*entries), ent_compare);
  49         for (size = i = 0; i < used; i++)
  50                 size += 32 + entries[i]->len;
  51
  52         strbuf_init(&buf, size);
  53         for (i = 0; i < used; i++) {
  54                 struct treeent *ent = entries[i];
  55                 strbuf_addf(&buf, "%o %s%c", ent->mode, ent->name, '\0');
  56                 strbuf_add(&buf, ent->sha1, 20);
  57         }
  58
  59         write_sha1_file(buf.buf, buf.len, tree_type, sha1);
  60         strbuf_release(&buf);
  61 }
  62
  63 static const char *mktree_usage[] = {
  64         N_("git mktree [-z] [--missing] [--batch]"),
  65         NULL
  66 };
  67
  68 static void mktree_line(char *buf, size_t len, int line_termination, int allow_missing)
  69 {
  70         char *ptr, *ntr;
  71         unsigned mode;
  72         enum object_type mode_type; /* object type derived from mode */
  73         enum object_type obj_type; /* object type derived from sha */
  74         char *path;
  75         unsigned char sha1[20];
  76
  77         ptr = buf;
  78         /*
  79          * Read non-recursive ls-tree output format:
  80          *     mode SP type SP sha1 TAB name
  81          */
  82         mode = strtoul(ptr, &ntr, 8);
  83         if (ptr == ntr || !ntr || *ntr != ' ')
  84                 die("input format error: %s", buf);
  85         ptr = ntr + 1; /* type */
  86         ntr = strchr(ptr, ' ');
  87         if (!ntr || buf + len <= ntr + 40 ||
  88             ntr[41] != '\t' ||
  89             get_sha1_hex(ntr + 1, sha1))
  90                 die("input format error: %s", buf);
  91
  92         /* It is perfectly normal if we do not have a commit from a submodule */
  93         if (S_ISGITLINK(mode))
  94                 allow_missing = 1;
  95
  96
  97         *ntr++ = 0; /* now at the beginning of SHA1 */
  98
  99         path = ntr + 41;  /* at the beginning of name */
 100         if (line_termination && path[0] == '"') {
 101                 struct strbuf p_uq = STRBUF_INIT;
 102                 if (unquote_c_style(&p_uq, path, NULL))
 103                         die("invalid quoting");
 104                 path = strbuf_detach(&p_uq, NULL);
 105         }
 106
 107         /*
 108          * Object type is redundantly derivable three ways.
 109          * These should all agree.
 110          */
 111         mode_type = object_type(mode);
 112         if (mode_type != type_from_string(ptr)) {
 113                 die("entry '%s' object type (%s) doesn't match mode type (%s)",
 114                         path, ptr, typename(mode_type));
 115         }
 116
 117         /* Check the type of object identified by sha1 */
 118         obj_type = sha1_object_info(sha1, NULL);
 119         if (obj_type < 0) {
 120                 if (allow_missing) {
 121                         ; /* no problem - missing objects are presumed to be of the right type */
 122                 } else {
 123                         die("entry '%s' object %s is unavailable", path, sha1_to_hex(sha1));
 124                 }
 125         } else {
 126                 if (obj_type != mode_type) {
 127                         /*
 128                          * The object exists but is of the wrong type.
 129                          * This is a problem regardless of allow_missing
 130                          * because the new tree entry will never be correct.
 131                          */
 132                         die("entry '%s' object %s is a %s but specified type was (%s)",
 133                                 path, sha1_to_hex(sha1), typename(obj_type), typename(mode_type));
 134                 }
 135         }
 136
 137         append_to_tree(mode, sha1, path);
 138 }
 139
 140 int cmd_mktree(int ac, const char **av, const char *prefix)
 141 {
 142         struct strbuf sb = STRBUF_INIT;
 143         unsigned char sha1[20];
 144         int line_termination = '\n';
 145         int allow_missing = 0;
 146         int is_batch_mode = 0;
 147         int got_eof = 0;
 148
 149         const struct option option[] = {
 150                 OPT_SET_INT('z', NULL, &line_termination, N_("input is NUL terminated"), '\0'),
 151                 OPT_SET_INT( 0 , "missing", &allow_missing, N_("allow missing objects"), 1),
 152                 OPT_SET_INT( 0 , "batch", &is_batch_mode, N_("allow creation of more than one tree"), 1),
 153                 OPT_END()
 154         };
 155
 156         ac = parse_options(ac, av, prefix, option, mktree_usage, 0);
 157
 158         while (!got_eof) {
 159                 while (1) {
 160                         if (strbuf_getline(&sb, stdin, line_termination) == EOF) {
 161                                 got_eof = 1;
 162                                 break;
 163                         }
 164                         if (sb.buf[0] == '\0') {
 165                                 /* empty lines denote tree boundaries in batch mode */
 166                                 if (is_batch_mode)
 167                                         break;
 168                                 die("input format error: (blank line only valid in batch mode)");
 169                         }
 170                         mktree_line(sb.buf, sb.len, line_termination, allow_missing);
 171                 }
 172                 if (is_batch_mode && got_eof && used < 1) {
 173                         /*
 174                          * Execution gets here if the last tree entry is terminated with a
 175                          * new-line.  The final new-line has been made optional to be
 176                          * consistent with the original non-batch behaviour of mktree.
 177                          */
 178                         ; /* skip creating an empty tree */
 179                 } else {
 180                         write_tree(sha1);
 181                         puts(sha1_to_hex(sha1));
 182                         fflush(stdout);
 183                 }
 184                 used=0; /* reset tree entry buffer for re-use in batch mode */
 185         }
 186         strbuf_release(&sb);
 187         exit(0);
 188 }