commit-tree.c

   1 /*
   2  * GIT - The information manager from hell
   3  *
   4  * Copyright (C) Linus Torvalds, 2005
   5  */
   6 #include "cache.h"
   7
   8 #define BLOCKING (1ul << 14)
   9
  10 /*
  11  * FIXME! Share the code with "write-tree.c"
  12  */
  13 static void init_buffer(char **bufp, unsigned int *sizep)
  14 {
  15         char *buf = xmalloc(BLOCKING);
  16         *sizep = 0;
  17         *bufp = buf;
  18 }
  19
  20 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
  21 {
  22         char one_line[2048];
  23         va_list args;
  24         int len;
  25         unsigned long alloc, size, newsize;
  26         char *buf;
  27
  28         va_start(args, fmt);
  29         len = vsnprintf(one_line, sizeof(one_line), fmt, args);
  30         va_end(args);
  31         size = *sizep;
  32         newsize = size + len;
  33         alloc = (size + 32767) & ~32767;
  34         buf = *bufp;
  35         if (newsize > alloc) {
  36                 alloc = (newsize + 32767) & ~32767;
  37                 buf = xrealloc(buf, alloc);
  38                 *bufp = buf;
  39         }
  40         *sizep = newsize;
  41         memcpy(buf + size, one_line, len);
  42 }
  43
  44 static void check_valid(unsigned char *sha1, const char *expect)
  45 {
  46         void *buf;
  47         char type[20];
  48         unsigned long size;
  49
  50         buf = read_sha1_file(sha1, type, &size);
  51         if (!buf || strcmp(type, expect))
  52                 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
  53         free(buf);
  54 }
  55
  56 /*
  57  * Having more than two parents is not strange at all, and this is
  58  * how multi-way merges are represented.
  59  */
  60 #define MAXPARENT (16)
  61 static unsigned char parent_sha1[MAXPARENT][20];
  62
  63 static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
  64
  65 static int new_parent(int idx)
  66 {
  67         int i;
  68         unsigned char *sha1 = parent_sha1[idx];
  69         for (i = 0; i < idx; i++) {
  70                 if (!memcmp(parent_sha1[i], sha1, 20)) {
  71                         error("duplicate parent %s ignored", sha1_to_hex(sha1));
  72                         return 0;
  73                 }
  74         }
  75         return 1;
  76 }
  77
  78 int main(int argc, char **argv)
  79 {
  80         int i;
  81         int parents = 0;
  82         unsigned char tree_sha1[20];
  83         unsigned char commit_sha1[20];
  84         char comment[1000];
  85         char *buffer;
  86         unsigned int size;
  87
  88         setup_ident();
  89         git_config(git_default_config);
  90
  91         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
  92                 usage(commit_tree_usage);
  93
  94         check_valid(tree_sha1, "tree");
  95         for (i = 2; i < argc; i += 2) {
  96                 char *a, *b;
  97                 a = argv[i]; b = argv[i+1];
  98                 if (!b || strcmp(a, "-p") || get_sha1(b, parent_sha1[parents]))
  99                         usage(commit_tree_usage);
 100                 check_valid(parent_sha1[parents], "commit");
 101                 if (new_parent(parents))
 102                         parents++;
 103         }
 104         if (!parents)
 105                 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
 106
 107         init_buffer(&buffer, &size);
 108         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 109
 110         /*
 111          * NOTE! This ordering means that the same exact tree merged with a
 112          * different order of parents will be a _different_ changeset even
 113          * if everything else stays the same.
 114          */
 115         for (i = 0; i < parents; i++)
 116                 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 117
 118         /* Person/date information */
 119         add_buffer(&buffer, &size, "author %s\n", git_author_info());
 120         add_buffer(&buffer, &size, "committer %s\n\n", git_committer_info());
 121
 122         /* And add the comment */
 123         while (fgets(comment, sizeof(comment), stdin) != NULL)
 124                 add_buffer(&buffer, &size, "%s", comment);
 125
 126         write_sha1_file(buffer, size, "commit", commit_sha1);
 127         printf("%s\n", sha1_to_hex(commit_sha1));
 128         return 0;
 129 }