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 /*
  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)
  32 static unsigned char parent_sha1[MAXPARENT][20];
  33
  34 static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
  35
  36 static 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
  49 static 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
  54 int 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 }