Andrew's git - gitweb.git/blob - builtin-commit-tree.c

   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 */
   6#include "cache.h"
   7#include "commit.h"
   8#include "tree.h"
   9#include "builtin.h"
  10#include "utf8.h"
  11
  12#define BLOCKING (1ul << 14)
  13
  14/*
  15 * FIXME! Share the code with "write-tree.c"
  16 */
  17static void check_valid(unsigned char *sha1, enum object_type expect)
  18{
  19        enum object_type type = sha1_object_info(sha1, NULL);
  20        if (type < 0)
  21                die("%s is not a valid object", sha1_to_hex(sha1));
  22        if (type != expect)
  23                die("%s is not a valid '%s' object", sha1_to_hex(sha1),
  24                    typename(expect));
  25}
  26
  27/*
  28 * Having more than two parents is not strange at all, and this is
  29 * how multi-way merges are represented.
  30 */
  31#define MAXPARENT (16)
  32static unsigned char parent_sha1[MAXPARENT][20];
  33
  34static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
  35
  36static int new_parent(int idx)
  37{
  38        int i;
  39        unsigned char *sha1 = parent_sha1[idx];
  40        for (i = 0; i < idx; i++) {
  41                if (!hashcmp(parent_sha1[i], sha1)) {
  42                        error("duplicate parent %s ignored", sha1_to_hex(sha1));
  43                        return 0;
  44                }
  45        }
  46        return 1;
  47}
  48
  49static const char commit_utf8_warn[] =
  50"Warning: commit message does not conform to UTF-8.\n"
  51"You may want to amend it after fixing the message, or set the config\n"
  52"variable i18n.commitencoding to the encoding your project uses.\n";
  53
  54int cmd_commit_tree(int argc, const char **argv, const char *prefix)
  55{
  56        int i;
  57        int parents = 0;
  58        unsigned char tree_sha1[20];
  59        unsigned char commit_sha1[20];
  60        struct strbuf buffer;
  61        int encoding_is_utf8;
  62
  63        git_config(git_default_config);
  64
  65        if (argc < 2)
  66                usage(commit_tree_usage);
  67        if (get_sha1(argv[1], tree_sha1))
  68                die("Not a valid object name %s", argv[1]);
  69
  70        check_valid(tree_sha1, OBJ_TREE);
  71        for (i = 2; i < argc; i += 2) {
  72                const char *a, *b;
  73                a = argv[i]; b = argv[i+1];
  74                if (!b || strcmp(a, "-p"))
  75                        usage(commit_tree_usage);
  76
  77                if (parents >= MAXPARENT)
  78                        die("Too many parents (%d max)", MAXPARENT);
  79                if (get_sha1(b, parent_sha1[parents]))
  80                        die("Not a valid object name %s", b);
  81                check_valid(parent_sha1[parents], OBJ_COMMIT);
  82                if (new_parent(parents))
  83                        parents++;
  84        }
  85
  86        /* Not having i18n.commitencoding is the same as having utf-8 */
  87        encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
  88
  89        strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
  90        strbuf_addf(&buffer, "tree %s\n", sha1_to_hex(tree_sha1));
  91
  92        /*
  93         * NOTE! This ordering means that the same exact tree merged with a
  94         * different order of parents will be a _different_ changeset even
  95         * if everything else stays the same.
  96         */
  97        for (i = 0; i < parents; i++)
  98                strbuf_addf(&buffer, "parent %s\n", sha1_to_hex(parent_sha1[i]));
  99
 100        /* Person/date information */
 101        strbuf_addf(&buffer, "author %s\n", git_author_info(1));
 102        strbuf_addf(&buffer, "committer %s\n", git_committer_info(1));
 103        if (!encoding_is_utf8)
 104                strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
 105        strbuf_addch(&buffer, '\n');
 106
 107        /* And add the comment */
 108        if (strbuf_read(&buffer, 0, 0) < 0)
 109                die("git-commit-tree: read returned %s", strerror(errno));
 110
 111        /* And check the encoding */
 112        if (encoding_is_utf8 && !is_utf8(buffer.buf))
 113                fprintf(stderr, commit_utf8_warn);
 114
 115        if (!write_sha1_file(buffer.buf, buffer.len, commit_type, commit_sha1)) {
 116                printf("%s\n", sha1_to_hex(commit_sha1));
 117                return 0;
 118        }
 119        else
 120                return 1;
 121}