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