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