Andrew's git - gitweb.git/blob

   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 */
  20static 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
  28static 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
  52static 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
  62static 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
  80static 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
 108int 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                usage("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}