Add "cvs2git" program to convert a CVS archive into a GIT archive
It's very hacky, and it needs lots of work, but it seems to have converted Peter's "syslinux" archive successfully. Whether the end result is correct or not is to be seen. Tons of work still to do: do name conversion properly, and do tags etc. And testing. Lots of testing.
This commit is contained in:
Linus Torvalds
parent
6a9853cd45
commit
3e91311ae7
2
Makefile
2
Makefile
@ -2,7 +2,7 @@ CC=gcc
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CFLAGS=-Wall -O2
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HOME=$(shell echo $$HOME)
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PROGRAMS=mailsplit mailinfo stripspace
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PROGRAMS=mailsplit mailinfo stripspace cvs2git
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SCRIPTS=dotest applypatch
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all: $(PROGRAMS)
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255
cvs2git.c
Normal file
255
cvs2git.c
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@ -0,0 +1,255 @@
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/*
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* cvs2git
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*
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* Copyright (C) Linus Torvalds 2005
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*/
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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static int verbose = 0;
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/*
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* This is a really stupid program that takes cvsps output, and
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* generates a a long _shell_script_ that will create the GIT archive
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* from it.
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*
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* You've been warned. I told you it was stupid.
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*
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* NOTE NOTE NOTE! In order to do branches correctly, this needs
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* the fixed cvsps that has the "Ancestor branch" tag output.
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* Hopefully David Mansfield will update his distribution soon
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* enough (he's the one who wrote the patch, so at least we don't
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* have to figt maintainer issues ;)
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*/
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enum state {
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Header,
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Log,
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Members
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};
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static char *rcsdir;
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static char date[100];
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static char author[100];
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static char branch[100];
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static char ancestor[100];
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static char tag[100];
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static char log[32768];
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static int loglen = 0;
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static int initial_commit = 1;
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static void lookup_author(char *n, char **name, char **email)
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{
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/*
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* FIXME!!! I'm lazy and stupid.
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*
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* This could be something like
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*
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* printf("lookup_author '%s'\n", n);
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* *name = "$author_name";
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* *email = "$author_email";
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*
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* and that would allow the script to do its own
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* lookups at run-time.
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*/
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*name = n;
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*email = n;
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}
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static void prepare_commit(void)
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{
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char *author_name, *author_email;
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char *src_branch;
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lookup_author(author, &author_name, &author_email);
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printf("export GIT_COMMITTER_NAME=%s\n", author_name);
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printf("export GIT_COMMITTER_EMAIL=%s\n", author_email);
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printf("export GIT_AUTHOR_NAME=%s\n", author_name);
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printf("export GIT_AUTHOR_EMAIL=%s\n", author_email);
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printf("export GIT_AUTHOR_DATE='%s'\n", date);
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if (initial_commit)
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return;
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src_branch = *ancestor ? ancestor : branch;
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if (!strcmp(src_branch, "HEAD"))
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src_branch = "master";
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printf("ln -sf refs/heads/'%s' .git/HEAD\n", src_branch);
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printf("git-read-tree -m HEAD\n");
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printf("git-checkout-cache -f -u -a\n");
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}
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static void commit(void)
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{
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const char *cmit_parent = initial_commit ? "" : "-p HEAD";
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printf("tree=$(git-write-tree)\n");
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printf("cat > .cmitmsg <<EOFMSG\n%s\nEOFMSG\n", log);
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printf("commit=$(cat .cmitmsg | git-commit-tree $tree %s)\n", cmit_parent);
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printf("echo $commit > .git/HEAD\n");
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*date = 0;
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*author = 0;
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*branch = 0;
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*ancestor = 0;
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*tag = 0;
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loglen = 0;
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initial_commit = 0;
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}
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static void get_rcs_name(char *rcspathname, char *name, char *dir)
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{
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sprintf(rcspathname, "%s/%s,v", rcsdir, name);
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if (!access(rcspathname, R_OK))
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return;
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sprintf(rcspathname, "%s/Attic/%s,v", rcsdir, name);
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if (!access(rcspathname, R_OK))
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return;
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if (dir) {
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sprintf(rcspathname, "%s/%.*s/Attic/%s,v", rcsdir, (int)(dir - name), name, dir+1);
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if (!access(rcspathname, R_OK))
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return;
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}
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fprintf(stderr, "Unable to find RCS file for %s\n", name);
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exit(1);
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}
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static void update_file(char *line)
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{
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static char rcspathname[4096];
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char *name, *version;
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char *dir;
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while (isspace(*line))
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line++;
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name = line;
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line = strchr(line, ':');
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if (!line)
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return;
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*line++ = 0;
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line = strchr(line, '>');
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if (!line)
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return;
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*line++ = 0;
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version = line;
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line = strchr(line, '(');
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if (line) { /* "(DEAD)" */
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printf("git-update-cache --force-remove '%s'\n", name);
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return;
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}
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dir = strrchr(name, '/');
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if (dir)
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printf("mkdir -p %.*s\n", (int)(dir - name), name);
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get_rcs_name(rcspathname, name, dir);
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printf("co -p -r%s '%s' > '%s'\n", version, rcspathname, name);
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printf("git-update-cache --add -- '%s'\n", name);
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}
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struct hdrentry {
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const char *name;
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char *dest;
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} hdrs[] = {
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{ "Date:", date },
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{ "Author:", author },
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{ "Branch:", branch },
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{ "Ancestor branch:", ancestor },
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{ "Tag:", tag },
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{ "Log:", NULL },
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{ NULL, NULL }
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};
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int main(int argc, char **argv)
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{
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static char line[1000];
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enum state state = Header;
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rcsdir = getenv("RCSDIR");
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if (!rcsdir) {
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fprintf(stderr, "I need an $RCSDIR\n");
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exit(1);
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}
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printf("[ -d .git ] && exit 1\n");
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printf("git-init-db\n");
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printf("mkdir -p .git/refs/heads\n");
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printf("mkdir -p .git/refs/tags\n");
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printf("ln -sf refs/heads/master .git/HEAD\n");
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while (fgets(line, sizeof(line), stdin) != NULL) {
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int linelen = strlen(line);
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while (linelen && isspace(line[linelen-1]))
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line[--linelen] = 0;
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switch (state) {
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struct hdrentry *entry;
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case Header:
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if (verbose)
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printf("# H: %s\n", line);
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for (entry = hdrs ; entry->name ; entry++) {
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int len = strlen(entry->name);
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char *val;
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if (memcmp(entry->name, line, len))
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continue;
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if (!entry->dest) {
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state = Log;
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break;
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}
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val = line + len;
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linelen -= len;
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while (isspace(*val)) {
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val++;
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linelen--;
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}
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memcpy(entry->dest, val, linelen+1);
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break;
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}
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continue;
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case Log:
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if (verbose)
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printf("# L: %s\n", line);
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if (!strcmp(line, "Members:")) {
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while (loglen && isspace(log[loglen-1]))
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log[--loglen] = 0;
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prepare_commit();
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state = Members;
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continue;
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}
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if (loglen + linelen + 5 > sizeof(log))
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continue;
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memcpy(log + loglen, line, linelen);
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loglen += linelen;
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log[loglen++] = '\n';
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continue;
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case Members:
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if (verbose)
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printf("# M: %s\n", line);
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if (!linelen) {
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commit();
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state = Header;
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continue;
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}
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update_file(line);
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continue;
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}
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}
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return 0;
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}
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