Andrew's git - gitweb.git/blob

   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
  11static struct treeent {
  12        unsigned mode;
  13        unsigned char sha1[20];
  14        int len;
  15        char name[FLEX_ARRAY];
  16} **entries;
  17static int alloc, used;
  18
  19static 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
  34static 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
  42static 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
  63static const char *mktree_usage[] = {
  64        N_("git mktree [-z] [--missing] [--batch]"),
  65        NULL
  66};
  67
  68static 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
 140int 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}