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 <string.h>
  11 #include <ctype.h>
  12 #include <time.h>
  13
  14 #define BLOCKING (1ul << 14)
  15
  16 /*
  17  * FIXME! Share the code with "write-tree.c"
  18  */
  19 static void init_buffer(char **bufp, unsigned int *sizep)
  20 {
  21         char *buf = xmalloc(BLOCKING);
  22         *sizep = 0;
  23         *bufp = buf;
  24 }
  25
  26 static void add_buffer(char **bufp, unsigned int *sizep, const char *fmt, ...)
  27 {
  28         char one_line[2048];
  29         va_list args;
  30         int len;
  31         unsigned long alloc, size, newsize;
  32         char *buf;
  33
  34         va_start(args, fmt);
  35         len = vsnprintf(one_line, sizeof(one_line), fmt, args);
  36         va_end(args);
  37         size = *sizep;
  38         newsize = size + len;
  39         alloc = (size + 32767) & ~32767;
  40         buf = *bufp;
  41         if (newsize > alloc) {
  42                 alloc = (newsize + 32767) & ~32767;
  43                 buf = xrealloc(buf, alloc);
  44                 *bufp = buf;
  45         }
  46         *sizep = newsize;
  47         memcpy(buf + size, one_line, len);
  48 }
  49
  50 static void remove_special(char *p)
  51 {
  52         char c;
  53         char *dst = p, *src = p;
  54
  55         for (;;) {
  56                 c = *src;
  57                 src++;
  58                 switch(c) {
  59                 case '\n': case '<': case '>':
  60                         continue;
  61                 }
  62                 *dst++ = c;
  63                 if (!c)
  64                         break;
  65         }
  66
  67         /*
  68          * Go back, and remove crud from the end: some people
  69          * have commas etc in their gecos field
  70          */
  71         dst--;
  72         while (--dst >= p) {
  73                 unsigned char c = *dst;
  74                 switch (c) {
  75                 case ',': case ';': case '.':
  76                         *dst = 0;
  77                         continue;
  78                 }
  79                 break;
  80         }
  81 }
  82
  83 static void check_valid(unsigned char *sha1, const char *expect)
  84 {
  85         void *buf;
  86         char type[20];
  87         unsigned long size;
  88
  89         buf = read_sha1_file(sha1, type, &size);
  90         if (!buf || strcmp(type, expect))
  91                 die("%s is not a valid '%s' object", sha1_to_hex(sha1), expect);
  92         free(buf);
  93 }
  94
  95 /*
  96  * Having more than two parents is not strange at all, and this is
  97  * how multi-way merges are represented.
  98  */
  99 #define MAXPARENT (16)
 100
 101 static char *commit_tree_usage = "commit-tree <sha1> [-p <sha1>]* < changelog";
 102
 103 int main(int argc, char **argv)
 104 {
 105         int i, len;
 106         int parents = 0;
 107         unsigned char tree_sha1[20];
 108         unsigned char parent_sha1[MAXPARENT][20];
 109         unsigned char commit_sha1[20];
 110         char *gecos, *realgecos, *commitgecos;
 111         char *email, *commitemail, realemail[1000];
 112         char date[20], realdate[20];
 113         char *audate;
 114         char comment[1000];
 115         struct passwd *pw;
 116         char *buffer;
 117         unsigned int size;
 118
 119         if (argc < 2 || get_sha1_hex(argv[1], tree_sha1) < 0)
 120                 usage(commit_tree_usage);
 121
 122         check_valid(tree_sha1, "tree");
 123         for (i = 2; i < argc; i += 2) {
 124                 char *a, *b;
 125                 a = argv[i]; b = argv[i+1];
 126                 if (!b || strcmp(a, "-p") || get_sha1(b, parent_sha1[parents]))
 127                         usage(commit_tree_usage);
 128                 check_valid(parent_sha1[parents], "commit");
 129                 parents++;
 130         }
 131         if (!parents)
 132                 fprintf(stderr, "Committing initial tree %s\n", argv[1]);
 133         pw = getpwuid(getuid());
 134         if (!pw)
 135                 die("You don't exist. Go away!");
 136         realgecos = pw->pw_gecos;
 137         len = strlen(pw->pw_name);
 138         memcpy(realemail, pw->pw_name, len);
 139         realemail[len] = '@';
 140         gethostname(realemail+len+1, sizeof(realemail)-len-1);
 141         if (!strchr(realemail+len+1, '.')) {
 142                 strcat(realemail, ".");
 143                 getdomainname(realemail+strlen(realemail), sizeof(realemail)-strlen(realemail)-1);
 144         }
 145
 146         datestamp(realdate, sizeof(realdate));
 147         strcpy(date, realdate);
 148
 149         commitgecos = gitenv("GIT_COMMITTER_NAME") ? : realgecos;
 150         commitemail = gitenv("GIT_COMMITTER_EMAIL") ? : realemail;
 151         gecos = gitenv("GIT_AUTHOR_NAME") ? : realgecos;
 152         email = gitenv("GIT_AUTHOR_EMAIL") ? : realemail;
 153         audate = gitenv("GIT_AUTHOR_DATE");
 154         if (audate)
 155                 parse_date(audate, date, sizeof(date));
 156
 157         remove_special(gecos); remove_special(realgecos); remove_special(commitgecos);
 158         remove_special(email); remove_special(realemail); remove_special(commitemail);
 159
 160         init_buffer(&buffer, &size);
 161         add_buffer(&buffer, &size, "tree %s\n", sha1_to_hex(tree_sha1));
 162
 163         /*
 164          * NOTE! This ordering means that the same exact tree merged with a
 165          * different order of parents will be a _different_ changeset even
 166          * if everything else stays the same.
 167          */
 168         for (i = 0; i < parents; i++)
 169                 add_buffer(&buffer, &size, "parent %s\n", sha1_to_hex(parent_sha1[i]));
 170
 171         /* Person/date information */
 172         add_buffer(&buffer, &size, "author %s <%s> %s\n", gecos, email, date);
 173         add_buffer(&buffer, &size, "committer %s <%s> %s\n\n", commitgecos, commitemail, realdate);
 174
 175         /* And add the comment */
 176         while (fgets(comment, sizeof(comment), stdin) != NULL)
 177                 add_buffer(&buffer, &size, "%s", comment);
 178
 179         write_sha1_file(buffer, size, "commit", commit_sha1);
 180         printf("%s\n", sha1_to_hex(commit_sha1));
 181         return 0;
 182 }