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