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- /*
- * dpkg - main program for package management
- * filters.c - filtering routines for excluding bits of packages
- *
- * Copyright © 2007, 2008 Tollef Fog Heen <tfheen@err.no>
- * Copyright © 2008, 2010, 2012-2014 Guillem Jover <guillem@debian.org>
- * Copyright © 2010 Canonical Ltd.
- * written by Martin Pitt <martin.pitt@canonical.com>
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <https://www.gnu.org/licenses/>.
- */
- #include <config.h>
- #include <compat.h>
- #include <fnmatch.h>
- #include <dpkg/i18n.h>
- #include <dpkg/dpkg.h>
- #include <dpkg/dpkg-db.h>
- #include "main.h"
- #include "filesdb.h"
- #include "filters.h"
- struct filter_node {
- struct filter_node *next;
- char *pattern;
- bool include;
- };
- static struct filter_node *filter_head = NULL;
- static struct filter_node **filter_tail = &filter_head;
- void
- filter_add(const char *pattern, bool include)
- {
- struct filter_node *filter;
- debug(dbg_general, "adding %s filter for '%s'",
- include ? "include" : "exclude", pattern);
- filter = m_malloc(sizeof(*filter));
- filter->pattern = m_strdup(pattern);
- filter->include = include;
- filter->next = NULL;
- *filter_tail = filter;
- filter_tail = &filter->next;
- }
- bool
- filter_should_skip(struct tar_entry *ti)
- {
- struct filter_node *f;
- bool skip = false;
- if (!filter_head)
- return false;
- /* Last match wins. */
- for (f = filter_head; f != NULL; f = f->next) {
- debug(dbg_eachfile, "filter comparing '%s' and '%s'",
- &ti->name[1], f->pattern);
- if (fnmatch(f->pattern, &ti->name[1], 0) == 0) {
- if (f->include) {
- skip = false;
- debug(dbg_eachfile, "filter including %s",
- ti->name);
- } else {
- skip = true;
- debug(dbg_eachfile, "filter removing %s",
- ti->name);
- }
- }
- }
- /* We need to keep directories (or symlinks to directories) if a
- * glob excludes them, but a more specific include glob brings back
- * files; XXX the current implementation will probably include more
- * directories than necessary, but better err on the side of caution
- * than failing with “no such file or directory” (which would leave
- * the package in a very bad state). */
- if (skip && (ti->type == TAR_FILETYPE_DIR ||
- ti->type == TAR_FILETYPE_SYMLINK)) {
- debug(dbg_eachfile,
- "filter seeing if '%s' needs to be reincluded",
- &ti->name[1]);
- for (f = filter_head; f != NULL; f = f->next) {
- const char *wildcard;
- int path_len;
- if (!f->include)
- continue;
- /* Calculate the offset of the first wildcard
- * character in the pattern. */
- wildcard = strpbrk(f->pattern, "*?[\\");
- if (wildcard)
- path_len = wildcard - f->pattern;
- else
- path_len = strlen(f->pattern);
- /* Ignore any trailing slash for the comparison. */
- while (path_len && f->pattern[path_len - 1] == '/')
- path_len--;
- debug(dbg_eachfiledetail,
- "filter subpattern '%.*s'", path_len, f->pattern);
- if (strncmp(&ti->name[1], f->pattern, path_len) == 0) {
- debug(dbg_eachfile, "filter reincluding %s",
- ti->name);
- return false;
- }
- }
- }
- return skip;
- }
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