git.oblomov.eu Git - git/blob - 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 enum state {
  29         Header,
  30         Log,
  31         Members
  32 };
  33
  34 static char *rcsdir;
  35
  36 static char date[100];
  37 static char author[100];
  38 static char branch[100];
  39 static char ancestor[100];
  40 static char tag[100];
  41 static char log[32768];
  42 static int loglen = 0;
  43 static int initial_commit = 1;
  44
  45 static void lookup_author(char *n, char **name, char **email)
  46 {
  47         /*
  48          * FIXME!!! I'm lazy and stupid.
  49          *
  50          * This could be something like
  51          *
  52          *      printf("lookup_author '%s'\n", n);
  53          *      *name = "$author_name";
  54          *      *email = "$author_email";
  55          *
  56          * and that would allow the script to do its own
  57          * lookups at run-time.
  58          */
  59         *name = n;
  60         *email = n;
  61 }
  62
  63 static void prepare_commit(void)
  64 {
  65         char *author_name, *author_email;
  66         char *src_branch;
  67
  68         lookup_author(author, &author_name, &author_email);
  69
  70         printf("export GIT_COMMITTER_NAME=%s\n", author_name);
  71         printf("export GIT_COMMITTER_EMAIL=%s\n", author_email);
  72
  73         printf("export GIT_AUTHOR_NAME=%s\n", author_name);
  74         printf("export GIT_AUTHOR_EMAIL=%s\n", author_email);
  75
  76         printf("export GIT_AUTHOR_DATE='%s'\n", date);
  77
  78         if (initial_commit)
  79                 return;
  80
  81         src_branch = *ancestor ? ancestor : branch;
  82         if (!strcmp(src_branch, "HEAD"))
  83                 src_branch = "master";
  84         printf("ln -sf refs/heads/'%s' .git/HEAD\n", src_branch);
  85         printf("git-read-tree -m HEAD || exit 1\n");
  86         printf("git-checkout-cache -f -u -a\n");
  87 }
  88
  89 static void commit(void)
  90 {
  91         const char *cmit_parent = initial_commit ? "" : "-p HEAD";
  92         const char *dst_branch;
  93
  94         printf("tree=$(git-write-tree)\n");
  95         printf("cat > .cmitmsg <<EOFMSG\n%s\nEOFMSG\n", log);
  96         printf("commit=$(cat .cmitmsg | git-commit-tree $tree %s)\n", cmit_parent);
  97
  98         dst_branch = branch;
  99         if (!strcmp(dst_branch, "HEAD"))
 100                 dst_branch = "master";
 101
 102         printf("echo $commit > .git/refs/heads/'%s'\n", dst_branch);
 103
 104         *date = 0;
 105         *author = 0;
 106         *branch = 0;
 107         *ancestor = 0;
 108         *tag = 0;
 109         loglen = 0;
 110
 111         initial_commit = 0;
 112 }
 113
 114 static void get_rcs_name(char *rcspathname, char *name, char *dir)
 115 {
 116         sprintf(rcspathname, "%s/%s,v", rcsdir, name);
 117         if (!access(rcspathname, R_OK))
 118                 return;
 119
 120         sprintf(rcspathname, "%s/Attic/%s,v", rcsdir, name);
 121         if (!access(rcspathname, R_OK))
 122                 return;
 123
 124         if (dir) {
 125                 sprintf(rcspathname, "%s/%.*s/Attic/%s,v", rcsdir, (int)(dir - name), name, dir+1);
 126                 if (!access(rcspathname, R_OK))
 127                         return;
 128         }
 129         fprintf(stderr, "Unable to find RCS file for %s\n", name);
 130         exit(1);
 131 }
 132
 133 static void update_file(char *line)
 134 {
 135         static char rcspathname[4096];
 136         char *name, *version;
 137         char *dir;
 138
 139         while (isspace(*line))
 140                 line++;
 141         name = line;
 142         line = strchr(line, ':');
 143         if (!line)
 144                 return;
 145         *line++ = 0;
 146         line = strchr(line, '>');
 147         if (!line)
 148                 return;
 149         *line++ = 0;
 150         version = line;
 151         line = strchr(line, '(');
 152         if (line) {     /* "(DEAD)" */
 153                 printf("git-update-cache --force-remove '%s'\n", name);
 154                 return;
 155         }
 156
 157         dir = strrchr(name, '/');
 158         if (dir)
 159                 printf("mkdir -p %.*s\n", (int)(dir - name), name);
 160
 161         get_rcs_name(rcspathname, name, dir);
 162
 163         printf("co -q -p -r%s '%s' > '%s'\n", version, rcspathname, name);
 164         printf("git-update-cache --add -- '%s'\n", name);
 165 }
 166
 167 struct hdrentry {
 168         const char *name;
 169         char *dest;
 170 } hdrs[] = {
 171         { "Date:", date },
 172         { "Author:", author },
 173         { "Branch:", branch },
 174         { "Ancestor branch:", ancestor },
 175         { "Tag:", tag },
 176         { "Log:", NULL },
 177         { NULL, NULL }
 178 };
 179
 180 int main(int argc, char **argv)
 181 {
 182         static char line[1000];
 183         enum state state = Header;
 184
 185         rcsdir = getenv("RCSDIR");
 186         if (!rcsdir) {
 187                 fprintf(stderr, "I need an $RCSDIR\n");
 188                 exit(1);
 189         }
 190
 191         printf("[ -d .git ] && exit 1\n");
 192         printf("git-init-db\n");
 193         printf("mkdir -p .git/refs/heads\n");
 194         printf("mkdir -p .git/refs/tags\n");
 195         printf("ln -sf refs/heads/master .git/HEAD\n");
 196
 197         while (fgets(line, sizeof(line), stdin) != NULL) {
 198                 int linelen = strlen(line);
 199
 200                 while (linelen && isspace(line[linelen-1]))
 201                         line[--linelen] = 0;
 202
 203                 switch (state) {
 204                 struct hdrentry *entry;
 205
 206                 case Header:
 207                         if (verbose)
 208                                 printf("# H: %s\n", line);
 209                         for (entry = hdrs ; entry->name ; entry++) {
 210                                 int len = strlen(entry->name);
 211                                 char *val;
 212
 213                                 if (memcmp(entry->name, line, len))
 214                                         continue;
 215                                 if (!entry->dest) {
 216                                         state = Log;
 217                                         break;
 218                                 }
 219                                 val = line + len;
 220                                 linelen -= len;
 221                                 while (isspace(*val)) {
 222                                         val++;
 223                                         linelen--;
 224                                 }
 225                                 memcpy(entry->dest, val, linelen+1);
 226                                 break;
 227                         }
 228                         continue;
 229
 230                 case Log:
 231                         if (verbose)
 232                                 printf("# L: %s\n", line);
 233                         if (!strcmp(line, "Members:")) {
 234                                 while (loglen && isspace(log[loglen-1]))
 235                                         log[--loglen] = 0;
 236                                 prepare_commit();
 237                                 state = Members;
 238                                 continue;
 239                         }
 240
 241                         if (loglen + linelen + 5 > sizeof(log))
 242                                 continue;
 243                         memcpy(log + loglen, line, linelen);
 244                         loglen += linelen;
 245                         log[loglen++] = '\n';
 246                         continue;
 247
 248                 case Members:
 249                         if (verbose)
 250                                 printf("# M: %s\n", line);
 251                         if (!linelen) {
 252                                 commit();
 253                                 state = Header;
 254                                 continue;
 255                         }
 256                         update_file(line);
 257                         continue;
 258                 }
 259         }
 260         return 0;
 261 }