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 remove_special(char *p)
  49 {
  50         char c;
  51         char *dst = p, *src = p;
  52
  53         for (;;) {
  54                 c = *src;
  55                 src++;
  56                 switch(c) {
  57                 case '\n': case '<': case '>':
  58                         continue;
  59                 }
  60                 *dst++ = c;
  61                 if (!c)
  62                         break;
  63         }
  64
  65         /*
  66          * Go back, and remove crud from the end: some people
  67          * have commas etc in their gecos field
  68          */
  69         dst--;
  70         while (--dst >= p) {
  71                 unsigned char c = *dst;
  72                 switch (c) {
  73                 case ',': case ';': case '.':
  74                         *dst = 0;
  75                         continue;
  76                 }
  77                 break;
  78         }
  79 }
  80
  81 static void check_valid(unsigned char *sha1, const char *expect)
  82 {
  83         void *buf;
  84         char type[20];
  85         unsigned long size;
  86
  87         buf = read_sha1_file(sha1, type, &size);
  88         if (!buf || strcmp(type, expect))
  89                 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
  90         free(buf);
  91 }
  92
  93 /*
  94  * Having more than two parents is not strange at all, and this is
  95  * how multi-way merges are represented.
  96  */
  97 #define MAXPARENT (16)
  98
  99 static char *commit_tree_usage = "git-commit-tree <sha1> [-p <sha1>]* < changelog";
 100
 101 int main(int argc, char **argv)
 102 {
 103         int i, len;
 104         int parents = 0;
 105         unsigned char tree_sha1[20];
 106         unsigned char parent_sha1[MAXPARENT][20];
 107         unsigned char commit_sha1[20];
 108         char *gecos, *realgecos, *commitgecos;
 109         char *email, *commitemail, realemail[1000];
 110         char date[20], realdate[20];
 111         char *audate;
 112         char comment[1000];
 113         struct passwd *pw;
 114         char *buffer;
 115         unsigned int size;
 116
 117         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
 118                 usage(commit_tree_usage);
 119
 120         check_valid(tree_sha1, "tree");
 121         for (i = 2; i < argc; i += 2) {
 122                 char *a, *b;
 123                 a = argv[i]; b = argv[i+1];
 124                 if (!b || strcmp(a, "-p") || get_sha1(b, parent_sha1[parents]))
 125                         usage(commit_tree_usage);
 126                 check_valid(parent_sha1[parents], "commit");
 127                 parents++;
 128         }
 129         if (!parents)
 130                 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
 131         pw = getpwuid(getuid());
 132         if (!pw)
 133                 die("You don't exist. Go away!");
 134         realgecos = pw->pw_gecos;
 135         len = strlen(pw->pw_name);
 136         memcpy(realemail, pw->pw_name, len);
 137         realemail[len] = '@';
 138         gethostname(realemail+len+1, sizeof(realemail)-len-1);
 139         if (!strchr(realemail+len+1, '.')) {
 140                 strcat(realemail, ".");
 141                 getdomainname(realemail+strlen(realemail), sizeof(realemail)-strlen(realemail)-1);
 142         }
 143
 144         datestamp(realdate, sizeof(realdate));
 145         strcpy(date, realdate);
 146
 147         commitgecos = gitenv("GIT_COMMITTER_NAME") ? : realgecos;
 148         commitemail = gitenv("GIT_COMMITTER_EMAIL") ? : realemail;
 149         gecos = gitenv("GIT_AUTHOR_NAME") ? : realgecos;
 150         email = gitenv("GIT_AUTHOR_EMAIL") ? : realemail;
 151         audate = gitenv("GIT_AUTHOR_DATE");
 152         if (audate)
 153                 parse_date(audate, date, sizeof(date));
 154
 155         remove_special(gecos); remove_special(realgecos); remove_special(commitgecos);
 156         remove_special(email); remove_special(realemail); remove_special(commitemail);
 157
 158         init_buffer(&buffer, &size);
 159         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 160
 161         /*
 162          * NOTE! This ordering means that the same exact tree merged with a
 163          * different order of parents will be a _different_ changeset even
 164          * if everything else stays the same.
 165          */
 166         for (i = 0; i < parents; i++)
 167                 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 168
 169         /* Person/date information */
 170         add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
 171         add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", commitgecos, commitemail, realdate);
 172
 173         /* And add the comment */
 174         while (fgets(comment, sizeof(comment), stdin) != NULL)
 175                 add_buffer(&buffer, &size, "%s", comment);
 176
 177         write_sha1_file(buffer, size, "commit", commit_sha1);
 178         printf("%s\n", sha1_to_hex(commit_sha1));
 179         return 0;
 180 }