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  */
  17 static 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 static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
  28
  29 static 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
  43 static 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
  48 int 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
  95 int 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 }