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
  27static const char commit_tree_usage[] = "git commit-tree <sha1> [-p <sha1>]* < changelog";
  28
  29static void new_parent(struct commit *parent, struct commit_list **parents_p)
  30{
  31        unsigned char *sha1 = parent->object.sha1;
  32        struct commit_list *parents;
  33        for (parents = *parents_p; parents; parents = parents->next) {
  34                if (parents->item == parent) {
  35                        error("duplicate parent %s ignored", sha1_to_hex(sha1));
  36                        return;
  37                }
  38                parents_p = &parents->next;
  39        }
  40        commit_list_insert(parent, parents_p);
  41}
  42
  43static const char commit_utf8_warn[] =
  44"Warning: commit message does not conform to UTF-8.\n"
  45"You may want to amend it after fixing the message, or set the config\n"
  46"variable i18n.commitencoding to the encoding your project uses.\n";
  47
  48int commit_tree(const char *msg, unsigned char *tree,
  49                struct commit_list *parents, unsigned char *ret)
  50{
  51        int result;
  52        int encoding_is_utf8;
  53        struct strbuf buffer;
  54
  55        check_valid(tree, OBJ_TREE);
  56
  57        /* Not having i18n.commitencoding is the same as having utf-8 */
  58        encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
  59
  60        strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
  61        strbuf_addf(&buffer, "tree %s\n", sha1_to_hex(tree));
  62
  63        /*
  64         * NOTE! This ordering means that the same exact tree merged with a
  65         * different order of parents will be a _different_ changeset even
  66         * if everything else stays the same.
  67         */
  68        while (parents) {
  69                struct commit_list *next = parents->next;
  70                strbuf_addf(&buffer, "parent %s\n",
  71                        sha1_to_hex(parents->item->object.sha1));
  72                free(parents);
  73                parents = next;
  74        }
  75
  76        /* Person/date information */
  77        strbuf_addf(&buffer, "author %s\n", git_author_info(IDENT_ERROR_ON_NO_NAME));
  78        strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_ERROR_ON_NO_NAME));
  79        if (!encoding_is_utf8)
  80                strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
  81        strbuf_addch(&buffer, '\n');
  82
  83        /* And add the comment */
  84        strbuf_addstr(&buffer, msg);
  85
  86        /* And check the encoding */
  87        if (encoding_is_utf8 && !is_utf8(buffer.buf))
  88                fprintf(stderr, commit_utf8_warn);
  89
  90        result = write_sha1_file(buffer.buf, buffer.len, commit_type, ret);
  91        strbuf_release(&buffer);
  92        return result;
  93}
  94
  95int cmd_commit_tree(int argc, const char **argv, const char *prefix)
  96{
  97        int i;
  98        struct commit_list *parents = NULL;
  99        unsigned char tree_sha1[20];
 100        unsigned char commit_sha1[20];
 101        struct strbuf buffer = STRBUF_INIT;
 102
 103        git_config(git_default_config, NULL);
 104
 105        if (argc < 2)
 106                usage(commit_tree_usage);
 107        if (get_sha1(argv[1], tree_sha1))
 108                die("Not a valid object name %s", argv[1]);
 109
 110        for (i = 2; i < argc; i += 2) {
 111                unsigned char sha1[20];
 112                const char *a, *b;
 113                a = argv[i]; b = argv[i+1];
 114                if (!b || strcmp(a, "-p"))
 115                        usage(commit_tree_usage);
 116
 117                if (get_sha1(b, sha1))
 118                        die("Not a valid object name %s", b);
 119                check_valid(sha1, OBJ_COMMIT);
 120                new_parent(lookup_commit(sha1), &parents);
 121        }
 122
 123        if (strbuf_read(&buffer, 0, 0) < 0)
 124                die("git commit-tree: read returned %s", strerror(errno));
 125
 126        if (!commit_tree(buffer.buf, tree_sha1, parents, commit_sha1)) {
 127                printf("%s\n", sha1_to_hex(commit_sha1));
 128                return 0;
 129        }
 130        else
 131                return 1;
 132}