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/* database.c - Alpine Package Keeper (APK)
 *
 * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
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 * Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
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 * All rights reserved.
 *
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 * This program is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation. See http://www.gnu.org/ for details.
 */

#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
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#include <mntent.h>
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#include <limits.h>
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#include <unistd.h>
#include <malloc.h>
#include <string.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <fnmatch.h>
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#include <sys/vfs.h>
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include "apk_defines.h"
#include "apk_package.h"
#include "apk_database.h"
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#include "apk_applet.h"
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#include "apk_archive.h"
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#include "apk_print.h"

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static const apk_spn_match_def apk_spn_repo_separators = {
	[4] = (1<<0) /* */,
	[7] = (1<<2) /*:*/,
};

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enum {
	APK_DISALLOW_RMDIR = 0,
	APK_ALLOW_RMDIR = 1
};

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int apk_verbosity = 1;
unsigned int apk_flags = 0;
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static apk_blob_t tmpprefix = { .len=8, .ptr = ".apknew." };

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static const char * const apkindex_tar_gz = "APKINDEX.tar.gz";

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static const char * const apk_static_cache_dir = "var/cache/apk";
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static const char * const apk_linked_cache_dir = "etc/apk/cache";
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static const char * const apk_lock_file = "var/lock/apkdb";
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static const char * const apk_world_file = "etc/apk/world";
static const char * const apk_world_file_tmp = "etc/apk/world.new";
static const char * const apk_world_file_old = "var/lib/apk/world";
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static const char * const apk_arch_file = "etc/apk/arch";
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static const char * const apk_scripts_file = "lib/apk/db/scripts.tar";
static const char * const apk_scripts_file_tmp = "lib/apk/db/scripts.tar.new";
static const char * const apk_scripts_file_old = "var/lib/apk/scripts.tar";

static const char * const apk_triggers_file = "lib/apk/db/triggers";
static const char * const apk_triggers_file_tmp = "lib/apk/db/triggers.new";
static const char * const apk_triggers_file_old = "var/lib/apk/triggers";

static const char * const apk_installed_file = "lib/apk/db/installed";
static const char * const apk_installed_file_tmp = "lib/apk/db/installed.new";
static const char * const apk_installed_file_old = "var/lib/apk/installed";

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struct install_ctx {
	struct apk_database *db;
	struct apk_package *pkg;
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	struct apk_installed_package *ipkg;
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	int script;
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	char **script_args;
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	int script_pending : 1;
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	struct apk_db_dir_instance *diri;
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	struct apk_checksum data_csum;
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	struct apk_sign_ctx sctx;
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	apk_progress_cb cb;
	void *cb_ctx;
	size_t installed_size;
	size_t current_file_size;

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	struct hlist_node **diri_node;
	struct hlist_node **file_diri_node;
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};

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static apk_blob_t pkg_name_get_key(apk_hash_item item)
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{
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	return APK_BLOB_STR(((struct apk_name *) item)->name);
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}

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static void pkg_name_free(struct apk_name *name)
{
	free(name->name);
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	apk_provider_array_free(&name->providers);
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	apk_name_array_free(&name->rdepends);
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	apk_name_array_free(&name->rinstall_if);
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	free(name);
}

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static const struct apk_hash_ops pkg_name_hash_ops = {
	.node_offset = offsetof(struct apk_name, hash_node),
	.get_key = pkg_name_get_key,
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	.hash_key = apk_blob_hash,
	.compare = apk_blob_compare,
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	.delete_item = (apk_hash_delete_f) pkg_name_free,
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};

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static apk_blob_t pkg_info_get_key(apk_hash_item item)
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{
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	return APK_BLOB_CSUM(((struct apk_package *) item)->csum);
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}

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static unsigned long csum_hash(apk_blob_t csum)
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{
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	/* Checksum's highest bits have the most "randomness", use that
	 * directly as hash */
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	return *(unsigned long *) csum.ptr;
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}

static const struct apk_hash_ops pkg_info_hash_ops = {
	.node_offset = offsetof(struct apk_package, hash_node),
	.get_key = pkg_info_get_key,
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	.hash_key = csum_hash,
	.compare = apk_blob_compare,
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	.delete_item = (apk_hash_delete_f) apk_pkg_free,
};

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static apk_blob_t apk_db_dir_get_key(apk_hash_item item)
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{
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	struct apk_db_dir *dir = (struct apk_db_dir *) item;
	return APK_BLOB_PTR_LEN(dir->name, dir->namelen);
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}

static const struct apk_hash_ops dir_hash_ops = {
	.node_offset = offsetof(struct apk_db_dir, hash_node),
	.get_key = apk_db_dir_get_key,
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	.hash_key = apk_blob_hash,
	.compare = apk_blob_compare,
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	.delete_item = (apk_hash_delete_f) free,
};

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struct apk_db_file_hash_key {
	apk_blob_t dirname;
	apk_blob_t filename;
};

static unsigned long apk_db_file_hash_key(apk_blob_t _key)
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{
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	struct apk_db_file_hash_key *key = (struct apk_db_file_hash_key *) _key.ptr;

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	return apk_blob_hash_seed(key->filename, apk_blob_hash(key->dirname));
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}

static unsigned long apk_db_file_hash_item(apk_hash_item item)
{
	struct apk_db_file *dbf = (struct apk_db_file *) item;

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	return apk_blob_hash_seed(APK_BLOB_PTR_LEN(dbf->name, dbf->namelen),
				  dbf->diri->dir->hash);
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}

static int apk_db_file_compare_item(apk_hash_item item, apk_blob_t _key)
{
	struct apk_db_file *dbf = (struct apk_db_file *) item;
	struct apk_db_file_hash_key *key = (struct apk_db_file_hash_key *) _key.ptr;
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	struct apk_db_dir *dir = dbf->diri->dir;
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	int r;

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	r = apk_blob_compare(key->filename,
			     APK_BLOB_PTR_LEN(dbf->name, dbf->namelen));
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	if (r != 0)
		return r;

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	r = apk_blob_compare(key->dirname,
			     APK_BLOB_PTR_LEN(dir->name, dir->namelen));
	return r;
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}

static const struct apk_hash_ops file_hash_ops = {
	.node_offset = offsetof(struct apk_db_file, hash_node),
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	.hash_key = apk_db_file_hash_key,
	.hash_item = apk_db_file_hash_item,
	.compare_item = apk_db_file_compare_item,
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	.delete_item = (apk_hash_delete_f) free,
};

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struct apk_name *apk_db_query_name(struct apk_database *db, apk_blob_t name)
{
	return (struct apk_name *) apk_hash_get(&db->available.names, name);
}

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struct apk_name *apk_db_get_name(struct apk_database *db, apk_blob_t name)
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{
	struct apk_name *pn;
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	unsigned long hash = apk_hash_from_key(&db->available.names, name);
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	pn = (struct apk_name *) apk_hash_get_hashed(&db->available.names, name, hash);
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	if (pn != NULL)
		return pn;

	pn = calloc(1, sizeof(struct apk_name));
	if (pn == NULL)
		return NULL;

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	pn->name = apk_blob_cstr(name);
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	apk_provider_array_init(&pn->providers);
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	apk_name_array_init(&pn->rdepends);
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	apk_name_array_init(&pn->rinstall_if);
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	apk_hash_insert_hashed(&db->available.names, pn, hash);
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	return pn;
}

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static void apk_db_dir_mkdir(struct apk_database *db, struct apk_db_dir *dir)
{
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	if (apk_flags & APK_SIMULATE)
		return;

	/* Don't mess with root, as no package provides it directly */
	if (dir->namelen == 0)
		return;

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	if ((dir->refs == 1) ||
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	    (fchmodat(db->root_fd, dir->name, dir->mode, 0) != 0 &&
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	     errno == ENOENT))
		if ((mkdirat(db->root_fd, dir->name, dir->mode) != 0 &&
		     errno == EEXIST))
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			if (fchmodat(db->root_fd, dir->name, dir->mode, 0) != 0)
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				;

	if (fchownat(db->root_fd, dir->name, dir->uid, dir->gid, 0) != 0)
		;
}

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void apk_db_dir_unref(struct apk_database *db, struct apk_db_dir *dir, int allow_rmdir)
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{
	dir->refs--;
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	if (dir->refs > 0) {
		if (allow_rmdir) {
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			dir->recalc_mode = 1;
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			dir->mode = 0;
			dir->uid = (uid_t) -1;
			dir->gid = (gid_t) -1;
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		}
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		return;
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	}

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	db->installed.stats.dirs--;
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	if (allow_rmdir) {
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		/* The final instance of this directory was removed,
		 * so this directory gets deleted in reality too. */
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		dir->recalc_mode = 0;
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		dir->mode = 0;
		dir->uid = (uid_t) -1;
		dir->gid = (gid_t) -1;

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		if (dir->namelen)
			unlinkat(db->root_fd, dir->name, AT_REMOVEDIR);
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	} else if (dir->recalc_mode) {
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		/* Directory permissions need a reset. */
		apk_db_dir_mkdir(db, dir);
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	}
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	if (dir->parent != NULL)
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		apk_db_dir_unref(db, dir->parent, allow_rmdir);
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}

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struct apk_db_dir *apk_db_dir_ref(struct apk_db_dir *dir)
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{
	dir->refs++;
	return dir;
}

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struct apk_db_dir *apk_db_dir_query(struct apk_database *db,
				    apk_blob_t name)
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{
	return (struct apk_db_dir *) apk_hash_get(&db->installed.dirs, name);
}

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struct apk_db_dir *apk_db_dir_get(struct apk_database *db, apk_blob_t name)
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{
	struct apk_db_dir *dir;
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	struct apk_protected_path_array *ppaths;
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	apk_blob_t bparent;
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	unsigned long hash = apk_hash_from_key(&db->installed.dirs, name);
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	char *relative_name;
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	int i;
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	if (name.len && name.ptr[name.len-1] == '/')
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		name.len--;

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	dir = (struct apk_db_dir *) apk_hash_get_hashed(&db->installed.dirs, name, hash);
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	if (dir != NULL)
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		return apk_db_dir_ref(dir);
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	db->installed.stats.dirs++;
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	dir = malloc(sizeof(*dir) + name.len + 1);
	memset(dir, 0, sizeof(*dir));
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	dir->refs = 1;
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	dir->uid = (uid_t) -1;
	dir->gid = (gid_t) -1;
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	dir->rooted_name[0] = '/';
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	memcpy(dir->name, name.ptr, name.len);
	dir->name[name.len] = 0;
	dir->namelen = name.len;
	dir->hash = hash;
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	apk_protected_path_array_init(&dir->protected_paths);
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	apk_hash_insert_hashed(&db->installed.dirs, dir, hash);
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	if (name.len == 0) {
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		dir->parent = NULL;
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		dir->has_protected_children = 1;
		ppaths = NULL;
	} else if (apk_blob_rsplit(name, '/', &bparent, NULL)) {
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		dir->parent = apk_db_dir_get(db, bparent);
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		dir->protected = dir->parent->protected;
		dir->has_protected_children = dir->protected;
		dir->symlinks_only = dir->parent->symlinks_only;
		ppaths = dir->parent->protected_paths;
	} else {
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		dir->parent = apk_db_dir_get(db, APK_BLOB_NULL);
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		ppaths = db->protected_paths;
	}
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	if (ppaths == NULL)
		return dir;
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	relative_name = strrchr(dir->rooted_name, '/') + 1;
	for (i = 0; i < ppaths->num; i++) {
		struct apk_protected_path *ppath = &ppaths->item[i];
		char *slash;
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		slash = strchr(ppath->relative_pattern, '/');
		if (slash != NULL) {
			*slash = 0;
			if (fnmatch(ppath->relative_pattern, relative_name, FNM_PATHNAME) != 0) {
				*slash = '/';
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				continue;
			}
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			*slash = '/';

			*apk_protected_path_array_add(&dir->protected_paths) = (struct apk_protected_path) {
				.relative_pattern = slash + 1,
				.protected = ppath->protected,
				.symlinks_only = ppath->symlinks_only,
			};
		} else {
			if (fnmatch(ppath->relative_pattern, relative_name, FNM_PATHNAME) != 0)
				continue;
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			dir->protected = ppath->protected;
			dir->symlinks_only = ppath->symlinks_only;
		}
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		dir->has_protected_children |= ppath->protected;
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	}

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	return dir;
}

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static struct apk_db_dir_instance *apk_db_diri_new(struct apk_database *db,
						   struct apk_package *pkg,
						   apk_blob_t name,
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						   struct hlist_node ***after)
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{
	struct apk_db_dir_instance *diri;

	diri = calloc(1, sizeof(struct apk_db_dir_instance));
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	if (diri != NULL) {
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		hlist_add_after(&diri->pkg_dirs_list, *after);
		*after = &diri->pkg_dirs_list.next;
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		diri->dir = apk_db_dir_get(db, name);
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		diri->pkg = pkg;
	}
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	return diri;
}

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static void apk_db_dir_apply_diri_permissions(struct apk_db_dir_instance *diri)
{
	struct apk_db_dir *dir = diri->dir;

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	if (diri->uid < dir->uid ||
	    (diri->uid == dir->uid && diri->gid < dir->gid)) {
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		dir->uid = diri->uid;
		dir->gid = diri->gid;
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		dir->mode = diri->mode;
	} else if (diri->uid == dir->uid && diri->gid == dir->gid) {
		dir->mode &= diri->mode;
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	}
}

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static void apk_db_diri_set(struct apk_db_dir_instance *diri, mode_t mode,
			    uid_t uid, gid_t gid)
{
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	diri->mode = mode & 07777;
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	diri->uid = uid;
	diri->gid = gid;
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	apk_db_dir_apply_diri_permissions(diri);
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}

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static void apk_db_diri_free(struct apk_database *db,
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			     struct apk_db_dir_instance *diri,
			     int allow_rmdir)
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{
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	if (allow_rmdir == APK_DISALLOW_RMDIR &&
	    diri->dir->recalc_mode)
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		apk_db_dir_apply_diri_permissions(diri);

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	apk_db_dir_unref(db, diri->dir, allow_rmdir);
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	free(diri);
}

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struct apk_db_file *apk_db_file_query(struct apk_database *db,
				      apk_blob_t dir,
				      apk_blob_t name)
{
	struct apk_db_file_hash_key key;

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	if (dir.len && dir.ptr[dir.len-1] == '/')
		dir.len--;

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	key = (struct apk_db_file_hash_key) {
		.dirname = dir,
		.filename = name,
	};

	return (struct apk_db_file *) apk_hash_get(&db->installed.files,
						   APK_BLOB_BUF(&key));
}

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static struct apk_db_file *apk_db_file_new(struct apk_db_dir_instance *diri,
					   apk_blob_t name,
					   struct hlist_node ***after)
{
	struct apk_db_file *file;

	file = malloc(sizeof(*file) + name.len + 1);
	if (file == NULL)
		return NULL;

	memset(file, 0, sizeof(*file));
	memcpy(file->name, name.ptr, name.len);
	file->name[name.len] = 0;
	file->namelen = name.len;

	file->diri = diri;
	hlist_add_after(&file->diri_files_list, *after);
	*after = &file->diri_files_list.next;

	return file;
}

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static void apk_db_file_set(struct apk_db_file *file, mode_t mode, uid_t uid, gid_t gid)
{
	file->mode = mode & 07777;
	file->uid = uid;
	file->gid = gid;
}

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static struct apk_db_file *apk_db_file_get(struct apk_database *db,
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					   struct apk_db_dir_instance *diri,
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					   apk_blob_t name,
					   struct hlist_node ***after)
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{
	struct apk_db_file *file;
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	struct apk_db_file_hash_key key;
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	struct apk_db_dir *dir = diri->dir;
	unsigned long hash;
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	key = (struct apk_db_file_hash_key) {
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		.dirname = APK_BLOB_PTR_LEN(dir->name, dir->namelen),
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		.filename = name,
	};
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	hash = apk_blob_hash_seed(name, dir->hash);
	file = (struct apk_db_file *) apk_hash_get_hashed(
		&db->installed.files, APK_BLOB_BUF(&key), hash);
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	if (file != NULL)
		return file;

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	file = apk_db_file_new(diri, name, after);
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	apk_hash_insert_hashed(&db->installed.files, file, hash);
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	db->installed.stats.files++;
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	return file;
}

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static void apk_db_pkg_rdepends(struct apk_database *db, struct apk_package *pkg)
{
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	struct apk_name *rname, **rd;
	struct apk_dependency *d;
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	foreach_array_item(d, pkg->depends) {
		rname = d->name;
		foreach_array_item(rd, rname->rdepends)
			if (*rd == pkg->name)
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				goto rdeps_done;
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		*apk_name_array_add(&rname->rdepends) = pkg->name;
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rdeps_done: ;
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	}
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	foreach_array_item(d, pkg->install_if) {
		rname = d->name;
		foreach_array_item(rd, rname->rinstall_if)
			if (*rd == pkg->name)
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				goto riif_done;
		*apk_name_array_add(&rname->rinstall_if) = pkg->name;
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riif_done: ;
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	}
	return;
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}

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static inline void add_provider(struct apk_name *name, struct apk_provider p)
{
	*apk_provider_array_add(&name->providers) = p;
}

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struct apk_package *apk_db_pkg_add(struct apk_database *db, struct apk_package *pkg)
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{
	struct apk_package *idb;
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	int i;
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	if (pkg->license == NULL)
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		pkg->license = apk_blob_atomize(APK_BLOB_NULL);
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	/* Set as "cached" if installing from specified file, and
	 * for virtual packages */
	if (pkg->filename != NULL || pkg->installed_size == 0)
		pkg->repos |= BIT(APK_REPOSITORY_CACHED);

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	idb = apk_hash_get(&db->available.packages, APK_BLOB_CSUM(pkg->csum));
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	if (idb == NULL) {
		idb = pkg;
		apk_hash_insert(&db->available.packages, pkg);
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		add_provider(pkg->name, APK_PROVIDER_FROM_PACKAGE(pkg));
		for (i = 0; i < pkg->provides->num; i++) {
			struct apk_dependency *dep = &pkg->provides->item[i];
			add_provider(dep->name, APK_PROVIDER_FROM_PROVIDES(pkg, dep));
		}
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		apk_db_pkg_rdepends(db, pkg);
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	} else {
		idb->repos |= pkg->repos;
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		if (idb->filename == NULL && pkg->filename != NULL) {
			idb->filename = pkg->filename;
			pkg->filename = NULL;
		}
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		if (idb->ipkg == NULL && pkg->ipkg != NULL) {
			idb->ipkg = pkg->ipkg;
			idb->ipkg->pkg = idb;
			pkg->ipkg = NULL;
		}
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		apk_pkg_free(pkg);
	}
	return idb;
}

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static int apk_pkg_format_cache_pkg(apk_blob_t to, struct apk_package *pkg)
{
	/* pkgname-1.0_alpha1.12345678.apk */
	apk_blob_push_blob(&to, APK_BLOB_STR(pkg->name->name));
	apk_blob_push_blob(&to, APK_BLOB_STR("-"));
	apk_blob_push_blob(&to, *pkg->version);
	apk_blob_push_blob(&to, APK_BLOB_STR("."));
	apk_blob_push_hexdump(&to, APK_BLOB_PTR_LEN((char *) pkg->csum.data,
						    APK_CACHE_CSUM_BYTES));
	apk_blob_push_blob(&to, APK_BLOB_STR(".apk"));
	apk_blob_push_blob(&to, APK_BLOB_PTR_LEN("", 1));
	if (APK_BLOB_IS_NULL(to))
		return -ENOBUFS;
	return 0;
}

int apk_repo_format_cache_index(apk_blob_t to, struct apk_repository *repo)
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{
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	/* APKINDEX.12345678.tar.gz */
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	apk_blob_push_blob(&to, APK_BLOB_STR("APKINDEX."));
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	apk_blob_push_hexdump(&to, APK_BLOB_PTR_LEN((char *) repo->csum.data, APK_CACHE_CSUM_BYTES));
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	apk_blob_push_blob(&to, APK_BLOB_STR(".tar.gz"));
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	apk_blob_push_blob(&to, APK_BLOB_PTR_LEN("", 1));
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	if (APK_BLOB_IS_NULL(to))
		return -ENOBUFS;
	return 0;
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}

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int apk_repo_format_real_url(struct apk_database *db, struct apk_repository *repo,
			     struct apk_package *pkg, char *buf, size_t len)
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{
	int r;

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	if (pkg != NULL)
		r = snprintf(buf, len, "%s%s" BLOB_FMT "/"  PKG_FILE_FMT,
			     repo->url, repo->url[strlen(repo->url)-1] == '/' ? "" : "/",
			     BLOB_PRINTF(*db->arch), PKG_FILE_PRINTF(pkg));
	else
		r = snprintf(buf, len, "%s%s" BLOB_FMT "/%s",
			     repo->url, repo->url[strlen(repo->url)-1] == '/' ? "" : "/",
			     BLOB_PRINTF(*db->arch), apkindex_tar_gz);
	if (r >= len)
		return -ENOBUFS;
	return 0;
}
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int apk_repo_format_item(struct apk_database *db, struct apk_repository *repo, struct apk_package *pkg,
			 int *fd, char *buf, size_t len)
{
	if (strcmp(repo->url, "cache") == 0) {
		*fd = db->cache_fd;
		return apk_pkg_format_cache_pkg(APK_BLOB_PTR_LEN(buf, len), pkg);
	} else {
		*fd = AT_FDCWD;
		return apk_repo_format_real_url(db, repo, pkg, buf, len);
	}
}
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int apk_cache_download(struct apk_database *db, struct apk_repository *repo,
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		       struct apk_package *pkg, int verify,
		       apk_progress_cb cb, void *cb_ctx)
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{
	struct apk_istream *is;
	struct apk_bstream *bs;
	struct apk_sign_ctx sctx;
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	char url[PATH_MAX];
	char tmpcacheitem[128], *cacheitem = &tmpcacheitem[tmpprefix.len];
	apk_blob_t b = APK_BLOB_BUF(tmpcacheitem);
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	int r, fd;

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	apk_blob_push_blob(&b, tmpprefix);
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	if (pkg != NULL)
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		r = apk_pkg_format_cache_pkg(b, pkg);
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	else
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		r = apk_repo_format_cache_index(b, repo);
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	if (r < 0)
		return r;

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	r = apk_repo_format_real_url(db, repo, pkg, url, sizeof(url));
	if (r < 0)
		return r;
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	apk_message("fetch %s", url);

	if (apk_flags & APK_SIMULATE)
		return 0;
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	if (cb)
		cb(cb_ctx, 0);

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	if (verify != APK_SIGN_NONE) {
		apk_sign_ctx_init(&sctx, APK_SIGN_VERIFY, NULL, db->keys_fd);
		bs = apk_bstream_from_url(url);
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		bs = apk_bstream_tee(bs, db->cache_fd, tmpcacheitem, cb, cb_ctx);
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		is = apk_bstream_gunzip_mpart(bs, apk_sign_ctx_mpart_cb, &sctx);
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		r = apk_tar_parse(is, apk_sign_ctx_verify_tar, &sctx, FALSE, &db->id_cache);
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		apk_sign_ctx_free(&sctx);
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	} else {
		is = apk_istream_from_url(url);
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		fd = openat(db->cache_fd, tmpcacheitem, O_RDWR | O_CREAT | O_TRUNC | O_CLOEXEC, 0644);
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		if (fd >= 0) {
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			r = apk_istream_splice(is, fd, APK_SPLICE_ALL, cb, cb_ctx);
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			close(fd);
		} else {
			r = -errno;
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		}
	}
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	is->close(is);
	if (r < 0) {
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		unlinkat(db->cache_fd, tmpcacheitem, 0);
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		return r;
	}
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	if (renameat(db->cache_fd, tmpcacheitem, db->cache_fd, cacheitem) < 0)
		return -errno;
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	return 0;
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}

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static struct apk_db_dir_instance *find_diri(struct apk_installed_package *ipkg,
					     apk_blob_t dirname,
					     struct apk_db_dir_instance *curdiri,
					     struct hlist_node ***tail)
{
	struct hlist_node *n;
	struct apk_db_dir_instance *diri;

	if (curdiri != NULL &&
	    apk_blob_compare(APK_BLOB_PTR_LEN(curdiri->dir->name,
					      curdiri->dir->namelen),
			     dirname) == 0)
		return curdiri;

	hlist_for_each_entry(diri, n, &ipkg->owned_dirs, pkg_dirs_list) {
		if (apk_blob_compare(APK_BLOB_PTR_LEN(diri->dir->name,
						      diri->dir->namelen), dirname) == 0) {
			if (tail != NULL)
				*tail = hlist_tail_ptr(&diri->owned_files);
			return diri;
		}
	}
	return NULL;
}

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int apk_db_read_overlay(struct apk_database *db, struct apk_bstream *bs)
{
	struct apk_db_dir_instance *diri = NULL;
	struct hlist_node **diri_node = NULL, **file_diri_node = NULL;
	struct apk_package *pkg;
	struct apk_installed_package *ipkg;
	apk_blob_t token = APK_BLOB_STR("\n"), line, bdir, bfile;

	pkg = apk_pkg_new();
	if (pkg == NULL)
		return -1;

	ipkg = apk_pkg_install(db, pkg);
	if (ipkg == NULL)
		return -1;

	diri_node = hlist_tail_ptr(&ipkg->owned_dirs);

	while (!APK_BLOB_IS_NULL(line = bs->read(bs, token))) {
		if (!apk_blob_rsplit(line, '/', &bdir, &bfile))
			break;

		if (bfile.len == 0) {
			diri = apk_db_diri_new(db, pkg, bdir, &diri_node);
			file_diri_node = &diri->owned_files.first;
		} else {
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			diri = find_diri(ipkg, bdir, diri, &file_diri_node);
			if (diri == NULL) {
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				diri = apk_db_diri_new(db, pkg, bdir, &diri_node);
				file_diri_node = &diri->owned_files.first;
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			}
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			(void) apk_db_file_get(db, diri, bfile, &file_diri_node);
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		}
	}

	return 0;
}

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int apk_db_index_read(struct apk_database *db, struct apk_bstream *bs, int repo)
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{
	struct apk_package *pkg = NULL;
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	struct apk_installed_package *ipkg = NULL;
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	struct apk_db_dir_instance *diri = NULL;
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	struct apk_db_file *file = NULL;
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	struct hlist_node **diri_node = NULL;
	struct hlist_node **file_diri_node = NULL;
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	apk_blob_t token = APK_BLOB_STR("\n"), l;
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	mode_t mode;
	uid_t uid;
	gid_t gid;
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	int field, r;
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	while (!APK_BLOB_IS_NULL(l = bs->read(bs, token))) {
		if (l.len < 2 || l.ptr[1] != ':') {
			if (pkg == NULL)
				continue;
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			if (repo >= 0) {
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				pkg->repos |= BIT(repo);
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			} else if (repo == -1 && ipkg == NULL) {
				/* Installed package without files */
				ipkg = apk_pkg_install(db, pkg);
			}
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			if (apk_db_pkg_add(db, pkg) == NULL) {
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				apk_error("Installed database load failed");
				return -1;
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			}
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			pkg = NULL;
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			ipkg = NULL;
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			continue;
		}
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		/* Get field */
		field = l.ptr[0];
		l.ptr += 2;
		l.len -= 2;

		/* If no package, create new */
		if (pkg == NULL) {
			pkg = apk_pkg_new();
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			ipkg = NULL;
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			diri = NULL;
			file_diri_node = NULL;
		}
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		/* Standard index line? */
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		r = apk_pkg_add_info(db, pkg, field, l);
		if (r == 0) {
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			continue;
		}
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		if (r == 1 && repo == -1 && ipkg == NULL) {
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			/* Instert to installed database; this needs to
			 * happen after package name has been read, but
			 * before first FDB entry. */
			ipkg = apk_pkg_install(db, pkg);
			diri_node = hlist_tail_ptr(&ipkg->owned_dirs);
		}
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		if (repo != -1 || ipkg == NULL)
			continue;
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		/* Check FDB special entries */
		switch (field) {
		case 'F':
			if (pkg->name == NULL) {
				apk_error("FDB directory entry before package entry");
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				return -1;
			}
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			diri = apk_db_diri_new(db, pkg, l, &diri_node);
			file_diri_node = &diri->owned_files.first;
			break;
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		case 'a':
			if (file == NULL) {
				apk_error("FDB file attribute metadata entry before file entry");
				return -1;
			}
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		case 'M':
			if (diri == NULL) {
				apk_error("FDB directory metadata entry before directory entry");
				return -1;
			}
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			uid = apk_blob_pull_uint(&l, 10);
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			apk_blob_pull_char(&l, ':');
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			gid = apk_blob_pull_uint(&l, 10);
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			apk_blob_pull_char(&l, ':');
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			mode = apk_blob_pull_uint(&l, 8);
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			if (field == 'M')
				apk_db_diri_set(diri, mode, uid, gid);
			else
				apk_db_file_set(file, mode, uid, gid);
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			break;
		case 'R':
			if (diri == NULL) {
				apk_error("FDB file entry before directory entry");
				return -1;
			}
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			file = apk_db_file_get(db, diri, l, &file_diri_node);
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			break;
		case 'Z':
			if (file == NULL) {
				apk_error("FDB checksum entry before file entry");
				return -1;
			}
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			apk_blob_pull_csum(&l, &file->csum);
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			break;
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		case 'r':
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			apk_blob_pull_deps(&l, db, &ipkg->replaces);
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			break;
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		case 'q':
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			ipkg->replaces_priority = apk_blob_pull_uint(&l, 10);
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			break;
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		case 'p':
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		case 's':
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			ipkg->repository_tag = apk_db_get_tag_id(db, l);
			break;
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		default:
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			if (r != 0 && !(apk_flags & APK_FORCE)) {
				/* Installed db should not have unsupported fields */
				apk_error("This apk-tools is too old to handle installed packages");
				return -1;
			}
			/* Installed. So mark the package as installable. */
			pkg->filename = NULL;
			continue;
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		}
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		if (APK_BLOB_IS_NULL(l)) {
			apk_error("FDB format error in entry '%c'", field);
			return -1;
		}
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	}

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	return 0;
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}

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static int apk_db_write_fdb(struct apk_database *db, struct apk_ostream *os)
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{
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	struct apk_installed_package *ipkg;
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	struct apk_package *pkg;
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	struct apk_db_dir_instance *diri;
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	struct apk_db_file *file;
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	struct hlist_node *c1, *c2;
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	char buf[1024];
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	apk_blob_t bbuf = APK_BLOB_BUF(buf);
	int r;
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	list_for_each_entry(ipkg, &db->installed.packages, installed_pkgs_list) {
		pkg = ipkg->pkg;
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		r = apk_pkg_write_index_entry(pkg, os);
		if (r < 0)
			return r;
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