cvs2git.c

   1 /*
   2  * cvs2git
   3  *
   4  * Copyright (C) Linus Torvalds 2005
   5  */
   6
   7 #include <stdio.h>
   8 #include <ctype.h>
   9 #include <string.h>
  10 #include <stdlib.h>
  11 #include <unistd.h>
  12
  13 static int verbose = 0;
  14
  15 /*
  16  * This is a really stupid program that takes cvsps output, and
  17  * generates a a long _shell_script_ that will create the GIT archive
  18  * from it.
  19  *
  20  * You've been warned. I told you it was stupid.
  21  *
  22  * NOTE NOTE NOTE! In order to do branches correctly, this needs
  23  * the fixed cvsps that has the "Ancestor branch" tag output.
  24  * Hopefully David Mansfield will update his distribution soon
  25  * enough (he's the one who wrote the patch, so at least we don't
  26  * have to figt maintainer issues ;)
  27  *
  28  * Usage:
  29  *
  30  *      TZ=UTC cvsps -A |
  31  *              git-cvs2git --cvsroot=[root] --module=[module] > script
  32  *
  33  * Creates a shell script that will generate the .git archive of
  34  * the names CVS repository.
  35  *
  36  *      TZ=UTC cvsps -s 1234- -A |
  37  *              git-cvs2git -u --cvsroot=[root] --module=[module] > script
  38  *
  39  * Creates a shell script that will update the .git archive with
  40  * CVS changes from patchset 1234 until the last one.
  41  *
  42  * IMPORTANT NOTE ABOUT "cvsps"! This requires version 2.1 or better,
  43  * and the "TZ=UTC" and the "-A" flag is required for sane results!
  44  */
  45 enum state {
  46         Header,
  47         Log,
  48         Members
  49 };
  50
  51 static const char *cvsroot;
  52 static const char *cvsmodule;
  53
  54 static char date[100];
  55 static char author[100];
  56 static char branch[100];
  57 static char ancestor[100];
  58 static char tag[100];
  59 static char log[32768];
  60 static int loglen = 0;
  61 static int initial_commit = 1;
  62
  63 static void lookup_author(char *n, char **name, char **email)
  64 {
  65         /*
  66          * FIXME!!! I'm lazy and stupid.
  67          *
  68          * This could be something like
  69          *
  70          *      printf("lookup_author '%s'\n", n);
  71          *      *name = "$author_name";
  72          *      *email = "$author_email";
  73          *
  74          * and that would allow the script to do its own
  75          * lookups at run-time.
  76          */
  77         *name = n;
  78         *email = n;
  79 }
  80
  81 static void prepare_commit(void)
  82 {
  83         char *author_name, *author_email;
  84         char *src_branch;
  85
  86         lookup_author(author, &author_name, &author_email);
  87
  88         printf("export GIT_COMMITTER_NAME=%s\n", author_name);
  89         printf("export GIT_COMMITTER_EMAIL=%s\n", author_email);
  90         printf("export GIT_COMMITTER_DATE='+0000 %s'\n", date);
  91
  92         printf("export GIT_AUTHOR_NAME=%s\n", author_name);
  93         printf("export GIT_AUTHOR_EMAIL=%s\n", author_email);
  94         printf("export GIT_AUTHOR_DATE='+0000 %s'\n", date);
  95
  96         if (initial_commit)
  97                 return;
  98
  99         src_branch = *ancestor ? ancestor : branch;
 100         if (!strcmp(src_branch, "HEAD"))
 101                 src_branch = "master";
 102         printf("ln -sf refs/heads/'%s' .git/HEAD\n", src_branch);
 103
 104         /*
 105          * Even if cvsps claims an ancestor, we'll let the new
 106          * branch name take precedence if it already exists
 107          */
 108         if (*ancestor) {
 109                 src_branch = branch;
 110                 if (!strcmp(src_branch, "HEAD"))
 111                         src_branch = "master";
 112                 printf("[ -e .git/refs/heads/'%s' ] && ln -sf refs/heads/'%s' .git/HEAD\n",
 113                         src_branch, src_branch);
 114         }
 115
 116         printf("git-read-tree -m HEAD || exit 1\n");
 117         printf("git-checkout-cache -f -u -a\n");
 118 }
 119
 120 static void commit(void)
 121 {
 122         const char *cmit_parent = initial_commit ? "" : "-p HEAD";
 123         const char *dst_branch;
 124         char *space;
 125         int i;
 126
 127         printf("tree=$(git-write-tree)\n");
 128         printf("cat > .cmitmsg <<EOFMSG\n");
 129
 130         /* Escape $ characters, and remove control characters */
 131         for (i = 0; i < loglen; i++) {
 132                 unsigned char c = log[i];
 133
 134                 switch (c) {
 135                 case '$':
 136                 case '\\':
 137                 case '`':
 138                         putchar('\\');
 139                         break;
 140                 case 0 ... 31:
 141                         if (c == '\n' || c == '\t')
 142                                 break;
 143                 case 128 ... 159:
 144                         continue;
 145                 }
 146                 putchar(c);
 147         }
 148         printf("\nEOFMSG\n");
 149         printf("commit=$(cat .cmitmsg | git-commit-tree $tree %s)\n", cmit_parent);
 150
 151         dst_branch = branch;
 152         if (!strcmp(dst_branch, "HEAD"))
 153                 dst_branch = "master";
 154
 155         printf("echo $commit > .git/refs/heads/'%s'\n", dst_branch);
 156
 157         space = strchr(tag, ' ');
 158         if (space)
 159                 *space = 0;
 160         if (strcmp(tag, "(none)"))
 161                 printf("echo $commit > .git/refs/tags/'%s'\n", tag);
 162
 163         printf("echo 'Committed (to %s):' ; cat .cmitmsg; echo\n", dst_branch);
 164
 165         *date = 0;
 166         *author = 0;
 167         *branch = 0;
 168         *ancestor = 0;
 169         *tag = 0;
 170         loglen = 0;
 171
 172         initial_commit = 0;
 173 }
 174
 175 static void update_file(char *line)
 176 {
 177         char *name, *version;
 178         char *dir;
 179
 180         while (isspace(*line))
 181                 line++;
 182         name = line;
 183         line = strchr(line, ':');
 184         if (!line)
 185                 return;
 186         *line++ = 0;
 187         line = strchr(line, '>');
 188         if (!line)
 189                 return;
 190         *line++ = 0;
 191         version = line;
 192         line = strchr(line, '(');
 193         if (line) {     /* "(DEAD)" */
 194                 printf("git-update-cache --force-remove '%s'\n", name);
 195                 return;
 196         }
 197
 198         dir = strrchr(name, '/');
 199         if (dir)
 200                 printf("mkdir -p %.*s\n", (int)(dir - name), name);
 201
 202         printf("cvs -q -d %s checkout -d .git-tmp -r%s '%s/%s'\n",
 203                 cvsroot, version, cvsmodule, name);
 204         printf("mv -f .git-tmp/%s %s\n", dir ? dir+1 : name, name);
 205         printf("rm -rf .git-tmp\n");
 206         printf("git-update-cache --add -- '%s'\n", name);
 207 }
 208
 209 struct hdrentry {
 210         const char *name;
 211         char *dest;
 212 } hdrs[] = {
 213         { "Date:", date },
 214         { "Author:", author },
 215         { "Branch:", branch },
 216         { "Ancestor branch:", ancestor },
 217         { "Tag:", tag },
 218         { "Log:", NULL },
 219         { NULL, NULL }
 220 };
 221
 222 int main(int argc, char **argv)
 223 {
 224         static char line[1000];
 225         enum state state = Header;
 226         int i;
 227
 228         for (i = 1; i < argc; i++) {
 229                 const char *arg = argv[i];
 230                 if (!memcmp(arg, "--cvsroot=", 10)) {
 231                         cvsroot = arg + 10;
 232                         continue;
 233                 }
 234                 if (!memcmp(arg, "--module=", 9)) {
 235                         cvsmodule = arg+9;
 236                         continue;
 237                 }
 238                 if (!strcmp(arg, "-v")) {
 239                         verbose = 1;
 240                         continue;
 241                 }
 242                 if (!strcmp(arg, "-u")) {
 243                         initial_commit = 0;
 244                         continue;
 245                 }
 246         }
 247
 248
 249         if (!cvsroot)
 250                 cvsroot = getenv("CVSROOT");
 251
 252         if (!cvsmodule || !cvsroot) {
 253                 fprintf(stderr, "I need a CVSROOT and module name\n");
 254                 exit(1);
 255         }
 256
 257         if (initial_commit) {
 258                 printf("[ -d .git ] && exit 1\n");
 259                     printf("git-init-db\n");
 260                 printf("mkdir -p .git/refs/heads\n");
 261                 printf("mkdir -p .git/refs/tags\n");
 262                 printf("ln -sf refs/heads/master .git/HEAD\n");
 263         }
 264
 265         while (fgets(line, sizeof(line), stdin) != NULL) {
 266                 int linelen = strlen(line);
 267
 268                 while (linelen && isspace(line[linelen-1]))
 269                         line[--linelen] = 0;
 270
 271                 switch (state) {
 272                 struct hdrentry *entry;
 273
 274                 case Header:
 275                         if (verbose)
 276                                 printf("# H: %s\n", line);
 277                         for (entry = hdrs ; entry->name ; entry++) {
 278                                 int len = strlen(entry->name);
 279                                 char *val;
 280
 281                                 if (memcmp(entry->name, line, len))
 282                                         continue;
 283                                 if (!entry->dest) {
 284                                         state = Log;
 285                                         break;
 286                                 }
 287                                 val = line + len;
 288                                 linelen -= len;
 289                                 while (isspace(*val)) {
 290                                         val++;
 291                                         linelen--;
 292                                 }
 293                                 memcpy(entry->dest, val, linelen+1);
 294                                 break;
 295                         }
 296                         continue;
 297
 298                 case Log:
 299                         if (verbose)
 300                                 printf("# L: %s\n", line);
 301                         if (!strcmp(line, "Members:")) {
 302                                 while (loglen && isspace(log[loglen-1]))
 303                                         log[--loglen] = 0;
 304                                 prepare_commit();
 305                                 state = Members;
 306                                 continue;
 307                         }
 308
 309                         if (loglen + linelen + 5 > sizeof(log))
 310                                 continue;
 311                         memcpy(log + loglen, line, linelen);
 312                         loglen += linelen;
 313                         log[loglen++] = '\n';
 314                         continue;
 315
 316                 case Members:
 317                         if (verbose)
 318                                 printf("# M: %s\n", line);
 319                         if (!linelen) {
 320                                 commit();
 321                                 state = Header;
 322                                 continue;
 323                         }
 324                         update_file(line);
 325                         continue;
 326                 }
 327         }
 328         return 0;
 329 }