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        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
  37static 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
  45static 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
  65static const char *mktree_usage[] = {
  66        "git mktree [-z] [--missing] [--batch]",
  67        NULL
  68};
  69
  70static 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 type;
  75        char *path;
  76        unsigned char sha1[20];
  77
  78        ptr = buf;
  79        /*
  80         * Read non-recursive ls-tree output format:
  81         *     mode SP type SP sha1 TAB name
  82         */
  83        mode = strtoul(ptr, &ntr, 8);
  84        if (ptr == ntr || !ntr || *ntr != ' ')
  85                die("input format error: %s", buf);
  86        ptr = ntr + 1; /* type */
  87        ntr = strchr(ptr, ' ');
  88        if (!ntr || buf + len <= ntr + 40 ||
  89            ntr[41] != '\t' ||
  90            get_sha1_hex(ntr + 1, sha1))
  91                die("input format error: %s", buf);
  92
  93        /* It is perfectly normal if we do not have a commit from a submodule */
  94        if (S_ISGITLINK(mode))
  95                allow_missing = 1;
  96
  97        if (!allow_missing)
  98                type = sha1_object_info(sha1, NULL);
  99        else
 100                type = object_type(mode);
 101
 102        if (type < 0)
 103                die("object %s unavailable", sha1_to_hex(sha1));
 104
 105        *ntr++ = 0; /* now at the beginning of SHA1 */
 106        if (type != type_from_string(ptr))
 107                die("object type %s mismatch (%s)", ptr, typename(type));
 108
 109        path = ntr + 41;  /* at the beginning of name */
 110        if (line_termination && path[0] == '"') {
 111                struct strbuf p_uq = STRBUF_INIT;
 112                if (unquote_c_style(&p_uq, path, NULL))
 113                        die("invalid quoting");
 114                path = strbuf_detach(&p_uq, NULL);
 115        }
 116        append_to_tree(mode, sha1, path);
 117}
 118
 119int cmd_mktree(int ac, const char **av, const char *prefix)
 120{
 121        struct strbuf sb = STRBUF_INIT;
 122        unsigned char sha1[20];
 123        int line_termination = '\n';
 124        int allow_missing = 0;
 125        int is_batch_mode = 0;
 126        int got_eof = 0;
 127
 128        const struct option option[] = {
 129                OPT_SET_INT('z', NULL, &line_termination, "input is NUL terminated", '\0'),
 130                OPT_SET_INT( 0 , "missing", &allow_missing, "allow missing objects", 1),
 131                OPT_SET_INT( 0 , "batch", &is_batch_mode, "allow creation of more than one tree", 1),
 132                OPT_END()
 133        };
 134
 135        ac = parse_options(ac, av, option, mktree_usage, 0);
 136
 137        while (!got_eof) {
 138                while (1) {
 139                        if (strbuf_getline(&sb, stdin, line_termination) == EOF) {
 140                                got_eof = 1;
 141                                break;
 142                        }
 143                        if (sb.buf[0] == '\0') {
 144                                /* empty lines denote tree boundaries in batch mode */
 145                                if (is_batch_mode)
 146                                        break;
 147                                die("input format error: (blank line only valid in batch mode)");
 148                        }
 149                        mktree_line(sb.buf, sb.len, line_termination, allow_missing);
 150                }
 151                if (is_batch_mode && got_eof && used < 1) {
 152                        /*
 153                         * Execution gets here if the last tree entry is terminated with a
 154                         * new-line.  The final new-line has been made optional to be
 155                         * consistent with the original non-batch behaviour of mktree.
 156                         */
 157                        ; /* skip creating an empty tree */
 158                } else {
 159                        write_tree(sha1);
 160                        puts(sha1_to_hex(sha1));
 161                        fflush(stdout);
 162                }
 163                used=0; /* reset tree entry buffer for re-use in batch mode */
 164        }
 165        strbuf_release(&sb);
 166        exit(0);
 167}