exclude.c

Rsync 3.0.5 source code

			case 'e':
				new_mflags |= MATCHFLG_EXCLUDE_SELF;
				break;
			case 'n':
				new_mflags |= MATCHFLG_NO_INHERIT;
				break;
			case 'p':
				new_mflags |= MATCHFLG_PERISHABLE;
				break;
			case 'r':
				new_mflags |= MATCHFLG_RECEIVER_SIDE;
				break;
			case 's':
				new_mflags |= MATCHFLG_SENDER_SIDE;
				break;
			case 'w':
				new_mflags |= MATCHFLG_WORD_SPLIT;
				break;
			}
		}
		if (*s)
			s++;
	}

	if (mflags & MATCHFLG_WORD_SPLIT) {
		const uchar *cp = s;
		/* Token ends at whitespace or the end of the string. */
		while (!isspace(*cp) && *cp != '\0')
			cp++;
		len = cp - s;
	} else
		len = strlen((char*)s);

	if (new_mflags & MATCHFLG_CLEAR_LIST) {
		if (!(mflags & MATCHFLG_NO_PREFIXES)
		 && !(xflags & XFLG_OLD_PREFIXES) && len) {
			rprintf(FERROR,
				"'!' rule has trailing characters: %s\n", p);
			exit_cleanup(RERR_SYNTAX);
		}
		if (len > 1)
			new_mflags &= ~MATCHFLG_CLEAR_LIST;
	} else if (!len && !(new_mflags & MATCHFLG_CVS_IGNORE)) {
		rprintf(FERROR, "unexpected end of filter rule: %s\n", p);
		exit_cleanup(RERR_SYNTAX);
	}

	/* --delete-excluded turns an un-modified include/exclude into a
	 * sender-side rule.  We also affect per-dir merge files that take
	 * no prefixes as a simple optimization. */
	if (delete_excluded
	 && !(new_mflags & (MATCHFLG_RECEIVER_SIDE|MATCHFLG_SENDER_SIDE))
	 && (!(new_mflags & MATCHFLG_PERDIR_MERGE)
	  || new_mflags & MATCHFLG_NO_PREFIXES))
		new_mflags |= MATCHFLG_SENDER_SIDE;

	*len_ptr = len;
	*mflags_ptr = new_mflags;
	return (const char *)s;
}


static char default_cvsignore[] =
	/* These default ignored items come from the CVS manual. */
	"RCS SCCS CVS CVS.adm RCSLOG cvslog.* tags TAGS"
	" .make.state .nse_depinfo *~ #* .#* ,* _$* *$"
	" *.old *.bak *.BAK *.orig *.rej .del-*"
	" *.a *.olb *.o *.obj *.so *.exe"
	" *.Z *.elc *.ln core"
	/* The rest we added to suit ourself. */
	" .svn/ .git/ .bzr/";

static void get_cvs_excludes(uint32 mflags)
{
	static int initialized = 0;
	char *p, fname[MAXPATHLEN];

	if (initialized)
		return;
	initialized = 1;

	parse_rule(&cvs_filter_list, default_cvsignore,
		   mflags | (protocol_version >= 30 ? MATCHFLG_PERISHABLE : 0),
		   0);

	p = module_id >= 0 && lp_use_chroot(module_id) ? "/" : getenv("HOME");
	if (p && pathjoin(fname, MAXPATHLEN, p, ".cvsignore") < MAXPATHLEN)
		parse_filter_file(&cvs_filter_list, fname, mflags, 0);

	parse_rule(&cvs_filter_list, getenv("CVSIGNORE"), mflags, 0);
}


void parse_rule(struct filter_list_struct *listp, const char *pattern,
		uint32 mflags, int xflags)
{
	unsigned int pat_len;
	uint32 new_mflags;
	const char *cp, *p;

	if (!pattern)
		return;

	while (1) {
		/* Remember that the returned string is NOT '\0' terminated! */
		cp = parse_rule_tok(pattern, mflags, xflags,
				    &pat_len, &new_mflags);
		if (!cp)
			break;

		pattern = cp + pat_len;

		if (pat_len >= MAXPATHLEN) {
			rprintf(FERROR, "discarding over-long filter: %.*s\n",
				(int)pat_len, cp);
			continue;
		}

		if (new_mflags & MATCHFLG_CLEAR_LIST) {
			if (verbose > 2) {
				rprintf(FINFO,
					"[%s] clearing filter list%s\n",
					who_am_i(), listp->debug_type);
			}
			clear_filter_list(listp);
			continue;
		}

		if (new_mflags & MATCHFLG_MERGE_FILE) {
			unsigned int len;
			if (!pat_len) {
				cp = ".cvsignore";
				pat_len = 10;
			}
			len = pat_len;
			if (new_mflags & MATCHFLG_EXCLUDE_SELF) {
				const char *name = cp + len;
				while (name > cp && name[-1] != '/') name--;
				len -= name - cp;
				add_rule(listp, name, len, 0, 0);
				new_mflags &= ~MATCHFLG_EXCLUDE_SELF;
				len = pat_len;
			}
			if (new_mflags & MATCHFLG_PERDIR_MERGE) {
				if (parent_dirscan) {
					if (!(p = parse_merge_name(cp, &len,
								module_dirlen)))
						continue;
					add_rule(listp, p, len, new_mflags, 0);
					continue;
				}
			} else {
				if (!(p = parse_merge_name(cp, &len, 0)))
					continue;
				parse_filter_file(listp, p, new_mflags,
						  XFLG_FATAL_ERRORS);
				continue;
			}
		}

		add_rule(listp, cp, pat_len, new_mflags, xflags);

		if (new_mflags & MATCHFLG_CVS_IGNORE
		    && !(new_mflags & MATCHFLG_MERGE_FILE))
			get_cvs_excludes(new_mflags);
	}
}


void parse_filter_file(struct filter_list_struct *listp, const char *fname,
		       uint32 mflags, int xflags)
{
	FILE *fp;
	char line[BIGPATHBUFLEN];
	char *eob = line + sizeof line - 1;
	int word_split = mflags & MATCHFLG_WORD_SPLIT;

	if (!fname || !*fname)
		return;

	if (*fname != '-' || fname[1] || am_server) {
		if (daemon_filter_list.head) {
			strlcpy(line, fname, sizeof line);
			clean_fname(line, CFN_COLLAPSE_DOT_DOT_DIRS);
			if (check_filter(&daemon_filter_list, FLOG, line, 0) < 0)
				fp = NULL;
			else
				fp = fopen(line, "rb");
		} else
			fp = fopen(fname, "rb");
	} else
		fp = stdin;

	if (verbose > 2) {
		rprintf(FINFO, "[%s] parse_filter_file(%s,%x,%x)%s\n",
			who_am_i(), fname, mflags, xflags,
			fp ? "" : " [not found]");
	}

	if (!fp) {
		if (xflags & XFLG_FATAL_ERRORS) {
			rsyserr(FERROR, errno,
				"failed to open %sclude file %s",
				mflags & MATCHFLG_INCLUDE ? "in" : "ex",
				fname);
			exit_cleanup(RERR_FILEIO);
		}
		return;
	}
	dirbuf[dirbuf_len] = '\0';

	while (1) {
		char *s = line;
		int ch, overflow = 0;
		while (1) {
			if ((ch = getc(fp)) == EOF) {
				if (ferror(fp) && errno == EINTR) {
					clearerr(fp);
					continue;
				}
				break;
			}
			if (word_split && isspace(ch))
				break;
			if (eol_nulls? !ch : (ch == '\n' || ch == '\r'))
				break;
			if (s < eob)
				*s++ = ch;
			else
				overflow = 1;
		}
		if (overflow) {
			rprintf(FERROR, "discarding over-long filter: %s...\n", line);
			s = line;
		}
		*s = '\0';
		/* Skip an empty token and (when line parsing) comments. */
		if (*line && (word_split || (*line != ';' && *line != '#')))
			parse_rule(listp, line, mflags, xflags);
		if (ch == EOF)
			break;
	}
	fclose(fp);
}

/* If the "for_xfer" flag is set, the prefix is made compatible with the
 * current protocol_version (if possible) or a NULL is returned (if not
 * possible). */
char *get_rule_prefix(int match_flags, const char *pat, int for_xfer,
		      unsigned int *plen_ptr)
{
	static char buf[MAX_RULE_PREFIX+1];
	char *op = buf;
	int legal_len = for_xfer && protocol_version < 29 ? 1 : MAX_RULE_PREFIX-1;

	if (match_flags & MATCHFLG_PERDIR_MERGE) {
		if (legal_len == 1)
			return NULL;
		*op++ = ':';
	} else if (match_flags & MATCHFLG_INCLUDE)
		*op++ = '+';
	else if (legal_len != 1
	    || ((*pat == '-' || *pat == '+') && pat[1] == ' '))
		*op++ = '-';
	else
		legal_len = 0;

	if (match_flags & MATCHFLG_NEGATE)
		*op++ = '!';
	if (match_flags & MATCHFLG_CVS_IGNORE)
		*op++ = 'C';
	else {
		if (match_flags & MATCHFLG_NO_INHERIT)
			*op++ = 'n';
		if (match_flags & MATCHFLG_WORD_SPLIT)
			*op++ = 'w';
		if (match_flags & MATCHFLG_NO_PREFIXES) {
			if (match_flags & MATCHFLG_INCLUDE)
				*op++ = '+';
			else
				*op++ = '-';
		}
	}
	if (match_flags & MATCHFLG_EXCLUDE_SELF)
		*op++ = 'e';
	if (match_flags & MATCHFLG_SENDER_SIDE
	    && (!for_xfer || protocol_version >= 29))
		*op++ = 's';
	if (match_flags & MATCHFLG_RECEIVER_SIDE
	    && (!for_xfer || protocol_version >= 29
	     || (delete_excluded && am_sender)))
		*op++ = 'r';
	if (match_flags & MATCHFLG_PERISHABLE) {
		if (!for_xfer || protocol_version >= 30)
			*op++ = 'p';
		else if (am_sender)
			return NULL;
	}
	if (op - buf > legal_len)
		return NULL;
	if (legal_len)
		*op++ = ' ';
	*op = '\0';
	if (plen_ptr)
		*plen_ptr = op - buf;
	return buf;
}

static void send_rules(int f_out, struct filter_list_struct *flp)
{
	struct filter_struct *ent, *prev = NULL;

	for (ent = flp->head; ent; ent = ent->next) {
		unsigned int len, plen, dlen;
		int elide = 0;
		char *p;

		/* Note we need to check delete_excluded here in addition to
		 * the code in parse_rule_tok() because some rules may have
		 * been added before we found the --delete-excluded option.
		 * We must also elide any CVS merge-file rules to avoid a
		 * backward compatibility problem, and we elide any no-prefix
		 * merge files as an optimization (since they can only have
		 * include/exclude rules). */
		if (ent->match_flags & MATCHFLG_SENDER_SIDE)
			elide = am_sender ? 1 : -1;
		if (ent->match_flags & MATCHFLG_RECEIVER_SIDE)
			elide = elide ? 0 : am_sender ? -1 : 1;
		else if (delete_excluded && !elide
		 && (!(ent->match_flags & MATCHFLG_PERDIR_MERGE)
		  || ent->match_flags & MATCHFLG_NO_PREFIXES))
			elide = am_sender ? 1 : -1;
		if (elide < 0) {
			if (prev)
				prev->next = ent->next;
			else
				flp->head = ent->next;
		} else
			prev = ent;
		if (elide > 0)
			continue;
		if (ent->match_flags & MATCHFLG_CVS_IGNORE
		    && !(ent->match_flags & MATCHFLG_MERGE_FILE)) {
			int f = am_sender || protocol_version < 29 ? f_out : -2;
			send_rules(f, &cvs_filter_list);
			if (f == f_out)
				continue;
		}
		p = get_rule_prefix(ent->match_flags, ent->pattern, 1, &plen);
		if (!p) {
			rprintf(FERROR,
				"filter rules are too modern for remote rsync.\n");
			exit_cleanup(RERR_PROTOCOL);
		}
		if (f_out < 0)
			continue;
		len = strlen(ent->pattern);
		dlen = ent->match_flags & MATCHFLG_DIRECTORY ? 1 : 0;
		if (!(plen + len + dlen))
			continue;
		write_int(f_out, plen + len + dlen);
		if (plen)
			write_buf(f_out, p, plen);
		write_buf(f_out, ent->pattern, len);
		if (dlen)
			write_byte(f_out, '/');
	}
	flp->tail = prev;
}

/* This is only called by the client. */
void send_filter_list(int f_out)
{
	int receiver_wants_list = prune_empty_dirs
	    || (delete_mode && (!delete_excluded || protocol_version >= 29));

	if (local_server || (am_sender && !receiver_wants_list))
		f_out = -1;
	if (cvs_exclude && am_sender) {
		if (protocol_version >= 29)
			parse_rule(&filter_list, ":C", 0, 0);
		parse_rule(&filter_list, "-C", 0, 0);
	}

	send_rules(f_out, &filter_list);

	if (f_out >= 0)
		write_int(f_out, 0);

	if (cvs_exclude) {
		if (!am_sender || protocol_version < 29)
			parse_rule(&filter_list, ":C", 0, 0);
		if (!am_sender)
			parse_rule(&filter_list, "-C", 0, 0);
	}
}

/* This is only called by the server. */
void recv_filter_list(int f_in)
{
	char line[BIGPATHBUFLEN];
	int xflags = protocol_version >= 29 ? 0 : XFLG_OLD_PREFIXES;
	int receiver_wants_list = prune_empty_dirs
	    || (delete_mode
	     && (!delete_excluded || protocol_version >= 29));
	unsigned int len;

	if (!local_server && (am_sender || receiver_wants_list)) {
		while ((len = read_int(f_in)) != 0) {
			if (len >= sizeof line)
				overflow_exit("recv_rules");
			read_sbuf(f_in, line, len);
			parse_rule(&filter_list, line, 0, xflags);
		}
	}

	if (cvs_exclude) {
		if (local_server || am_sender || protocol_version < 29)
			parse_rule(&filter_list, ":C", 0, 0);
		if (local_server || am_sender)
			parse_rule(&filter_list, "-C", 0, 0);
	}

	if (local_server) /* filter out any rules that aren't for us. */
		send_rules(-1, &filter_list);
}