Andrew's git - gitweb.git/blob

   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
  13static 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 *              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 * IMPORTANT NOTE ABOUT "cvsps"! This requires version 2.1 or better,
  37 * and the "TZ=UTC" and the "-A" flag is required for sane results!
  38 */
  39enum state {
  40        Header,
  41        Log,
  42        Members
  43};
  44
  45static const char *cvsroot;
  46static const char *cvsmodule;
  47
  48static char date[100];
  49static char author[100];
  50static char branch[100];
  51static char ancestor[100];
  52static char tag[100];
  53static char log[32768];
  54static int loglen = 0;
  55static int initial_commit = 1;
  56
  57static void lookup_author(char *n, char **name, char **email)
  58{
  59        /*
  60         * FIXME!!! I'm lazy and stupid.
  61         *
  62         * This could be something like
  63         *
  64         *      printf("lookup_author '%s'\n", n);
  65         *      *name = "$author_name";
  66         *      *email = "$author_email";
  67         *
  68         * and that would allow the script to do its own
  69         * lookups at run-time.
  70         */
  71        *name = n;
  72        *email = n;
  73}
  74
  75static void prepare_commit(void)
  76{
  77        char *author_name, *author_email;
  78        char *src_branch;
  79
  80        lookup_author(author, &author_name, &author_email);
  81
  82        printf("export GIT_COMMITTER_NAME=%s\n", author_name);
  83        printf("export GIT_COMMITTER_EMAIL=%s\n", author_email);
  84        printf("export GIT_COMMITTER_DATE='+0000 %s'\n", date);
  85
  86        printf("export GIT_AUTHOR_NAME=%s\n", author_name);
  87        printf("export GIT_AUTHOR_EMAIL=%s\n", author_email);
  88        printf("export GIT_AUTHOR_DATE='+0000 %s'\n", date);
  89
  90        if (initial_commit)
  91                return;
  92
  93        src_branch = *ancestor ? ancestor : branch;
  94        if (!strcmp(src_branch, "HEAD"))
  95                src_branch = "master";
  96        printf("ln -sf refs/heads/'%s' .git/HEAD\n", src_branch);
  97
  98        /*
  99         * Even if cvsps claims an ancestor, we'll let the new
 100         * branch name take precedence if it already exists
 101         */
 102        if (*ancestor) {
 103                src_branch = branch;
 104                if (!strcmp(src_branch, "HEAD"))
 105                        src_branch = "master";
 106                printf("[ -e .git/refs/heads/'%s' ] && ln -sf refs/heads/'%s' .git/HEAD\n",
 107                        src_branch, src_branch);
 108        }
 109
 110        printf("git-read-tree -m HEAD || exit 1\n");
 111        printf("git-checkout-cache -f -u -a\n");
 112}
 113
 114static void commit(void)
 115{
 116        const char *cmit_parent = initial_commit ? "" : "-p HEAD";
 117        const char *dst_branch;
 118        int i;
 119
 120        printf("tree=$(git-write-tree)\n");
 121        printf("cat > .cmitmsg <<EOFMSG\n");
 122
 123        /* Escape $ characters, and remove control characters */
 124        for (i = 0; i < loglen; i++) {
 125                unsigned char c = log[i];
 126
 127                switch (c) {
 128                case '$':
 129                case '\\':
 130                case '`':
 131                        putchar('\\');
 132                        break;
 133                case 0 ... 31:
 134                        if (c == '\n' || c == '\t')
 135                                break;
 136                case 128 ... 159:
 137                        continue;
 138                }
 139                putchar(c);
 140        }
 141        printf("\nEOFMSG\n");
 142        printf("commit=$(cat .cmitmsg | git-commit-tree $tree %s)\n", cmit_parent);
 143
 144        dst_branch = branch;
 145        if (!strcmp(dst_branch, "HEAD"))
 146                dst_branch = "master";
 147
 148        printf("echo $commit > .git/refs/heads/'%s'\n", dst_branch);
 149
 150        printf("echo 'Committed (to %s):' ; cat .cmitmsg; echo\n", dst_branch);
 151
 152        *date = 0;
 153        *author = 0;
 154        *branch = 0;
 155        *ancestor = 0;
 156        *tag = 0;
 157        loglen = 0;
 158
 159        initial_commit = 0;
 160}
 161
 162static void update_file(char *line)
 163{
 164        char *name, *version;
 165        char *dir;
 166
 167        while (isspace(*line))
 168                line++;
 169        name = line;
 170        line = strchr(line, ':');
 171        if (!line)
 172                return;
 173        *line++ = 0;
 174        line = strchr(line, '>');
 175        if (!line)
 176                return;
 177        *line++ = 0;
 178        version = line;
 179        line = strchr(line, '(');
 180        if (line) {     /* "(DEAD)" */
 181                printf("git-update-cache --force-remove '%s'\n", name);
 182                return;
 183        }
 184
 185        dir = strrchr(name, '/');
 186        if (dir)
 187                printf("mkdir -p %.*s\n", (int)(dir - name), name);
 188
 189        printf("cvs -q -d %s checkout -r%s -p '%s/%s' > '%s'\n", cvsroot, version, cvsmodule, name, name);
 190        printf("git-update-cache --add -- '%s'\n", name);
 191}
 192
 193struct hdrentry {
 194        const char *name;
 195        char *dest;
 196} hdrs[] = {
 197        { "Date:", date },
 198        { "Author:", author },
 199        { "Branch:", branch },
 200        { "Ancestor branch:", ancestor },
 201        { "Tag:", tag },
 202        { "Log:", NULL },
 203        { NULL, NULL }
 204};
 205
 206int main(int argc, char **argv)
 207{
 208        static char line[1000];
 209        enum state state = Header;
 210        int i;
 211
 212        for (i = 1; i < argc; i++) {
 213                const char *arg = argv[i];
 214                if (!memcmp(arg, "--cvsroot=", 10)) {
 215                        cvsroot = arg + 10;
 216                        continue;
 217                }
 218                if (!memcmp(arg, "--module=", 9)) {
 219                        cvsmodule = arg+9;
 220                        continue;
 221                } 
 222                if (!strcmp(arg, "-v")) {
 223                        verbose = 1;
 224                        continue;
 225                }
 226        }
 227
 228
 229        if (!cvsroot)
 230                cvsroot = getenv("CVSROOT");
 231
 232        if (!cvsmodule || !cvsroot) {
 233                fprintf(stderr, "I need a CVSROOT and module name\n");
 234                exit(1);
 235        }
 236
 237        printf("[ -d .git ] && exit 1\n");
 238        printf("git-init-db\n");
 239        printf("mkdir -p .git/refs/heads\n");
 240        printf("mkdir -p .git/refs/tags\n");
 241        printf("ln -sf refs/heads/master .git/HEAD\n");
 242
 243        while (fgets(line, sizeof(line), stdin) != NULL) {
 244                int linelen = strlen(line);
 245
 246                while (linelen && isspace(line[linelen-1]))
 247                        line[--linelen] = 0;
 248
 249                switch (state) {
 250                struct hdrentry *entry;
 251
 252                case Header:
 253                        if (verbose)
 254                                printf("# H: %s\n", line);
 255                        for (entry = hdrs ; entry->name ; entry++) {
 256                                int len = strlen(entry->name);
 257                                char *val;
 258
 259                                if (memcmp(entry->name, line, len))
 260                                        continue;
 261                                if (!entry->dest) {
 262                                        state = Log;
 263                                        break;
 264                                }
 265                                val = line + len;
 266                                linelen -= len;
 267                                while (isspace(*val)) {
 268                                        val++;
 269                                        linelen--;
 270                                }
 271                                memcpy(entry->dest, val, linelen+1);
 272                                break;
 273                        }
 274                        continue;
 275
 276                case Log:
 277                        if (verbose)
 278                                printf("# L: %s\n", line);
 279                        if (!strcmp(line, "Members:")) {
 280                                while (loglen && isspace(log[loglen-1]))
 281                                        log[--loglen] = 0;
 282                                prepare_commit();
 283                                state = Members;
 284                                continue;
 285                        }
 286                                
 287                        if (loglen + linelen + 5 > sizeof(log))
 288                                continue;
 289                        memcpy(log + loglen, line, linelen);
 290                        loglen += linelen;
 291                        log[loglen++] = '\n';
 292                        continue;
 293
 294                case Members:
 295                        if (verbose)
 296                                printf("# M: %s\n", line);
 297                        if (!linelen) {
 298                                commit();
 299                                state = Header;
 300                                continue;
 301                        }
 302                        update_file(line);
 303                        continue;
 304                }
 305        }
 306        return 0;
 307}