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
  10 #define BLOCKING (1ul << 14)
  11
  12 /*
  13  * FIXME! Share the code with "write-tree.c"
  14  */
  15 static void init_buffer(char **bufp, unsigned int *sizep)
  16 {
  17         char *buf = xmalloc(BLOCKING);
  18         *sizep = 0;
  19         *bufp = buf;
  20 }
  21
  22 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
  23 {
  24         char one_line[2048];
  25         va_list args;
  26         int len;
  27         unsigned long alloc, size, newsize;
  28         char *buf;
  29
  30         va_start(args, fmt);
  31         len = vsnprintf(one_line, sizeof(one_line), fmt, args);
  32         va_end(args);
  33         size = *sizep;
  34         newsize = size + len;
  35         alloc = (size + 32767) & ~32767;
  36         buf = *bufp;
  37         if (newsize > alloc) {
  38                 alloc = (newsize + 32767) & ~32767;
  39                 buf = xrealloc(buf, alloc);
  40                 *bufp = buf;
  41         }
  42         *sizep = newsize;
  43         memcpy(buf + size, one_line, len);
  44 }
  45
  46 static void check_valid(unsigned char *sha1, const char *expect)
  47 {
  48         void *buf;
  49         char type[20];
  50         unsigned long size;
  51
  52         buf = read_sha1_file(sha1, type, &size);
  53         if (!buf || strcmp(type, expect))
  54                 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
  55         free(buf);
  56 }
  57
  58 /*
  59  * Having more than two parents is not strange at all, and this is
  60  * how multi-way merges are represented.
  61  */
  62 #define MAXPARENT (16)
  63 static unsigned char parent_sha1[MAXPARENT][20];
  64
  65 static const char commit_tree_usage[] = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
  66
  67 static int new_parent(int idx)
  68 {
  69         int i;
  70         unsigned char *sha1 = parent_sha1[idx];
  71         for (i = 0; i < idx; i++) {
  72                 if (!memcmp(parent_sha1[i], sha1, 20)) {
  73                         error("duplicate parent %s ignored", sha1_to_hex(sha1));
  74                         return 0;
  75                 }
  76         }
  77         return 1;
  78 }
  79
  80 int main(int argc, char **argv)
  81 {
  82         int i;
  83         int parents = 0;
  84         unsigned char tree_sha1[20];
  85         unsigned char commit_sha1[20];
  86         char comment[1000];
  87         char *buffer;
  88         unsigned int size;
  89
  90         setup_ident();
  91         setup_git_directory();
  92
  93         git_config(git_default_config);
  94
  95         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
  96                 usage(commit_tree_usage);
  97
  98         check_valid(tree_sha1, tree_type);
  99         for (i = 2; i < argc; i += 2) {
 100                 char *a, *b;
 101                 a = argv[i]; b = argv[i+1];
 102                 if (!b || strcmp(a, "-p") || get_sha1(b, parent_sha1[parents]))
 103                         usage(commit_tree_usage);
 104                 check_valid(parent_sha1[parents], commit_type);
 105                 if (new_parent(parents))
 106                         parents++;
 107         }
 108         if (!parents)
 109                 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
 110
 111         init_buffer(&buffer, &size);
 112         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 113
 114         /*
 115          * NOTE! This ordering means that the same exact tree merged with a
 116          * different order of parents will be a _different_ changeset even
 117          * if everything else stays the same.
 118          */
 119         for (i = 0; i < parents; i++)
 120                 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 121
 122         /* Person/date information */
 123         add_buffer(&buffer, &size, "author %s\n", git_author_info(1));
 124         add_buffer(&buffer, &size, "committer %s\n\n", git_committer_info(1));
 125
 126         /* And add the comment */
 127         while (fgets(comment, sizeof(comment), stdin) != NULL)
 128                 add_buffer(&buffer, &size, "%s", comment);
 129
 130         if (!write_sha1_file(buffer, size, commit_type, commit_sha1)) {
 131                 printf("%s\n", sha1_to_hex(commit_sha1));
 132                 return 0;
 133         }
 134         else
 135                 return 1;
 136 }