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 encoding_is_utf8;
  52         struct strbuf buffer;
  53
  54         check_valid(tree, OBJ_TREE);
  55
  56         /* Not having i18n.commitencoding is the same as having utf-8 */
  57         encoding_is_utf8 = is_encoding_utf8(git_commit_encoding);
  58
  59         strbuf_init(&buffer, 8192); /* should avoid reallocs for the headers */
  60         strbuf_addf(&buffer, "tree %s\n", sha1_to_hex(tree));
  61
  62         /*
  63          * NOTE! This ordering means that the same exact tree merged with a
  64          * different order of parents will be a _different_ changeset even
  65          * if everything else stays the same.
  66          */
  67         while (parents) {
  68                 struct commit_list *next = parents->next;
  69                 strbuf_addf(&buffer, "parent %s\n",
  70                         sha1_to_hex(parents->item->object.sha1));
  71                 free(parents);
  72                 parents = next;
  73         }
  74
  75         /* Person/date information */
  76         strbuf_addf(&buffer, "author %s\n", git_author_info(IDENT_ERROR_ON_NO_NAME));
  77         strbuf_addf(&buffer, "committer %s\n", git_committer_info(IDENT_ERROR_ON_NO_NAME));
  78         if (!encoding_is_utf8)
  79                 strbuf_addf(&buffer, "encoding %s\n", git_commit_encoding);
  80         strbuf_addch(&buffer, '\n');
  81
  82         /* And add the comment */
  83         strbuf_addstr(&buffer, msg);
  84
  85         /* And check the encoding */
  86         if (encoding_is_utf8 && !is_utf8(buffer.buf))
  87                 fprintf(stderr, commit_utf8_warn);
  88
  89         return write_sha1_file(buffer.buf, buffer.len, commit_type, ret);
  90 }
  91
  92 int cmd_commit_tree(int argc, const char **argv, const char *prefix)
  93 {
  94         int i;
  95         struct commit_list *parents = NULL;
  96         unsigned char tree_sha1[20];
  97         unsigned char commit_sha1[20];
  98         struct strbuf buffer = STRBUF_INIT;
  99
 100         git_config(git_default_config, NULL);
 101
 102         if (argc < 2)
 103                 usage(commit_tree_usage);
 104         if (get_sha1(argv[1], tree_sha1))
 105                 die("Not a valid object name %s", argv[1]);
 106
 107         for (i = 2; i < argc; i += 2) {
 108                 unsigned char sha1[20];
 109                 const char *a, *b;
 110                 a = argv[i]; b = argv[i+1];
 111                 if (!b || strcmp(a, "-p"))
 112                         usage(commit_tree_usage);
 113
 114                 if (get_sha1(b, sha1))
 115                         die("Not a valid object name %s", b);
 116                 check_valid(sha1, OBJ_COMMIT);
 117                 new_parent(lookup_commit(sha1), &parents);
 118         }
 119
 120         if (strbuf_read(&buffer, 0, 0) < 0)
 121                 die("git commit-tree: read returned %s", strerror(errno));
 122
 123         if (!commit_tree(buffer.buf, tree_sha1, parents, commit_sha1)) {
 124                 printf("%s\n", sha1_to_hex(commit_sha1));
 125                 return 0;
 126         }
 127         else
 128                 return 1;
 129 }