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 #define ORIG_OFFSET (40)
  13
  14 /*
  15  * Leave space at the beginning to insert the tag
  16  * once we know how big things are.
  17  *
  18  * FIXME! Share the code with "write-tree.c"
  19  */
  20 static void init_buffer(char **bufp, unsigned int *sizep)
  21 {
  22         char *buf = malloc(BLOCKING);
  23         memset(buf, 0, ORIG_OFFSET);
  24         *sizep = ORIG_OFFSET;
  25         *bufp = buf;
  26 }
  27
  28 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
  29 {
  30         char one_line[2048];
  31         va_list args;
  32         int len;
  33         unsigned long alloc, size, newsize;
  34         char *buf;
  35
  36         va_start(args, fmt);
  37         len = vsnprintf(one_line, sizeof(one_line), fmt, args);
  38         va_end(args);
  39         size = *sizep;
  40         newsize = size + len;
  41         alloc = (size + 32767) & ~32767;
  42         buf = *bufp;
  43         if (newsize > alloc) {
  44                 alloc = (newsize + 32767) & ~32767;
  45                 buf = realloc(buf, alloc);
  46                 *bufp = buf;
  47         }
  48         *sizep = newsize;
  49         memcpy(buf + size, one_line, len);
  50 }
  51
  52 static int prepend_integer(char *buffer, unsigned val, int i)
  53 {
  54         buffer[--i] = '\0';
  55         do {
  56                 buffer[--i] = '0' + (val % 10);
  57                 val /= 10;
  58         } while (val);
  59         return i;
  60 }
  61
  62 static void finish_buffer(char *tag, char **bufp, unsigned int *sizep)
  63 {
  64         int taglen;
  65         int offset;
  66         char *buf = *bufp;
  67         unsigned int size = *sizep;
  68
  69         offset = prepend_integer(buf, size - ORIG_OFFSET, ORIG_OFFSET);
  70         taglen = strlen(tag);
  71         offset -= taglen;
  72         buf += offset;
  73         size -= offset;
  74         memcpy(buf, tag, taglen);
  75
  76         *bufp = buf;
  77         *sizep = size;
  78 }
  79
  80 static void remove_special(char *p)
  81 {
  82         char c;
  83         char *dst = p;
  84
  85         for (;;) {
  86                 c = *p;
  87                 p++;
  88                 switch(c) {
  89                 case '\n': case '<': case '>':
  90                         continue;
  91                 }
  92                 *dst++ = c;
  93                 if (!c)
  94                         break;
  95         }
  96 }
  97
  98 /*
  99  * Having more than two parents may be strange, but hey, there's
 100  * no conceptual reason why the file format couldn't accept multi-way
 101  * merges. It might be the "union" of several packages, for example.
 102  *
 103  * I don't really expect that to happen, but this is here to make
 104  * it clear that _conceptually_ it's ok..
 105  */
 106 #define MAXPARENT (16)
 107
 108 int main(int argc, char **argv)
 109 {
 110         int i, len;
 111         int parents = 0;
 112         unsigned char tree_sha1[20];
 113         unsigned char parent_sha1[MAXPARENT][20];
 114         unsigned char commit_sha1[20];
 115         char *gecos, *realgecos;
 116         char *email, realemail[1000];
 117         char *date, *realdate;
 118         char comment[1000];
 119         struct passwd *pw;
 120         time_t now;
 121         char *buffer;
 122         unsigned int size;
 123
 124         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
 125                 usage("commit-tree <sha1> [-p <sha1>]* < changelog");
 126
 127         for (i = 2; i < argc; i += 2) {
 128                 char *a, *b;
 129                 a = argv[i]; b = argv[i+1];
 130                 if (!b || strcmp(a, "-p") || get_sha1_hex(b, parent_sha1[parents]))
 131                         usage("commit-tree <sha1> [-p <sha1>]* < changelog");
 132                 parents++;
 133         }
 134         if (!parents)
 135                 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
 136         pw = getpwuid(getuid());
 137         if (!pw)
 138                 die("You don't exist. Go away!");
 139         realgecos = pw->pw_gecos;
 140         len = strlen(pw->pw_name);
 141         memcpy(realemail, pw->pw_name, len);
 142         realemail[len] = '@';
 143         gethostname(realemail+len+1, sizeof(realemail)-len-1);
 144         time(&now);
 145         realdate = ctime(&now);
 146
 147         gecos = getenv("AUTHOR_NAME") ? : realgecos;
 148         email = getenv("AUTHOR_EMAIL") ? : realemail;
 149         date = getenv("AUTHOR_DATE") ? : realdate;
 150
 151         remove_special(gecos); remove_special(realgecos);
 152         remove_special(email); remove_special(realemail);
 153         remove_special(date); remove_special(realdate);
 154
 155         init_buffer(&buffer, &size);
 156         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 157
 158         /*
 159          * NOTE! This ordering means that the same exact tree merged with a
 160          * different order of parents will be a _different_ changeset even
 161          * if everything else stays the same.
 162          */
 163         for (i = 0; i < parents; i++)
 164                 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 165
 166         /* Person/date information */
 167         add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
 168         add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", realgecos, realemail, realdate);
 169
 170         /* And add the comment */
 171         while (fgets(comment, sizeof(comment), stdin) != NULL)
 172                 add_buffer(&buffer, &size, "%s", comment);
 173
 174         finish_buffer("commit ", &buffer, &size);
 175
 176         write_sha1_file(buffer, size, commit_sha1);
 177         printf("%s\n", sha1_to_hex(commit_sha1));
 178         return 0;
 179 }