database.c 59.6 KB
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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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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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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";

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_package_array_free(&name->pkgs);
	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_package_array_init(&pn->pkgs);
	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_unref(struct apk_database *db, struct apk_db_dir *dir,
			     int allow_rmdir)
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{
	dir->refs--;
	if (dir->refs > 0)
		return;

	db->installed.stats.dirs--;
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	if (allow_rmdir)
		unlinkat(db->root_fd, dir->name, AT_REMOVEDIR);
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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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static 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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static 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;
	apk_blob_t bparent;
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	unsigned long hash = apk_hash_from_key(&db->installed.dirs, 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->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_hash_insert_hashed(&db->installed.dirs, dir, hash);
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	if (name.len == 0)
		dir->parent = NULL;
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	else if (apk_blob_rsplit(name, '/', &bparent, NULL))
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		dir->parent = apk_db_dir_get(db, bparent);
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	else
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		dir->parent = apk_db_dir_get(db, APK_BLOB_NULL);
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	if (dir->parent != NULL)
		dir->flags = dir->parent->flags;

	for (i = 0; i < db->protected_paths->num; i++) {
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		int flags = dir->flags, j;

		flags |= APK_DBDIRF_PROTECTED;
		for (j = 0; ; j++) {
			switch (db->protected_paths->item[i][j]) {
			case '-':
				flags &= ~(APK_DBDIRF_PROTECTED |
					   APK_DBDIRF_SYMLINKS_ONLY);
				continue;
			case '*':
				flags |= APK_DBDIRF_SYMLINKS_ONLY |
					 APK_DBDIRF_PROTECTED;
				continue;
			}
			break;
		}

		if (strcmp(&db->protected_paths->item[i][j], dir->name) == 0)
			dir->flags = flags;
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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;
}

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

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static void apk_db_diri_mkdir(struct apk_database *db, struct apk_db_dir_instance *diri)
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{
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	if (mkdirat(db->root_fd, diri->dir->name, diri->mode) == 0) {
		if (fchownat(db->root_fd, diri->dir->name, diri->uid, diri->gid, 0) != 0)
			;
	}
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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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	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;

	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 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)
{
	int i, j;
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	struct apk_name *rname;
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	for (i = 0; i < pkg->depends->num; i++) {
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		rname = pkg->depends->item[i].name;
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		for (j = 0; j < rname->rdepends->num; j++)
			if (rname->rdepends->item[j] == 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:
	for (i = 0; i < pkg->install_if->num; i++) {
		rname = pkg->install_if->item[i].name;
		for (j = 0; j < rname->rinstall_if->num; j++)
			if (rname->rinstall_if->item[j] == pkg->name)
				goto riif_done;
		*apk_name_array_add(&rname->rinstall_if) = pkg->name;
	}
riif_done:
	return;
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}

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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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	if (pkg->license == NULL)
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		pkg->license = apk_blob_atomize(APK_BLOB_NULL);
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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);
		*apk_package_array_add(&pkg->name->pkgs) = pkg;
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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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void apk_cache_format_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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int apk_cache_download(struct apk_database *db, const char *url, apk_blob_t *arch,
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		       const char *item, const char *cacheitem, int verify)
{
	char fullurl[PATH_MAX];
	int r;

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	apk_repo_format_filename(fullurl, sizeof(fullurl), url, arch, item);
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	apk_message("fetch %s", fullurl);

	if (apk_flags & APK_SIMULATE)
		return 0;

	r = apk_url_download(fullurl, db->cachetmp_fd, cacheitem);
	if (r < 0)
		return r;

	if (verify != APK_SIGN_NONE) {
		struct apk_istream *is;
		struct apk_sign_ctx sctx;

		apk_sign_ctx_init(&sctx, APK_SIGN_VERIFY, NULL, db->keys_fd);
		is = apk_bstream_gunzip_mpart(
			apk_bstream_from_file(db->cachetmp_fd, cacheitem),
			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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		is->close(is);
		apk_sign_ctx_free(&sctx);
		if (r != 0) {
			unlinkat(db->cachetmp_fd, cacheitem, 0);
			return r;
		}
	}
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	if (db->cachetmp_fd != db->cache_fd) {
		if (renameat(db->cachetmp_fd, cacheitem, 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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	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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			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) {
			if (repo == -1 && field == 'S') {
				/* 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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			continue;
		}
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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;
		case 'M':
			if (diri == NULL) {
				apk_error("FDB directory metadata entry before directory entry");
				return -1;
			}
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			diri->uid = apk_blob_pull_uint(&l, 10);
			apk_blob_pull_char(&l, ':');
			diri->gid = apk_blob_pull_uint(&l, 10);
			apk_blob_pull_char(&l, ':');
			diri->mode = apk_blob_pull_uint(&l, 8);
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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':
			if (ipkg != NULL)
				apk_blob_pull_deps(&l, db, &ipkg->replaces);
			break;
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		case 'q':
			if (ipkg != NULL)
				ipkg->replaces_priority = apk_blob_pull_uint(&l, 10);
			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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		if (ipkg->replaces->num) {
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("r:"));
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			apk_blob_push_deps(&bbuf, db, ipkg->replaces);
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			apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));
		}
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		if (ipkg->replaces_priority) {
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("q:"));
			apk_blob_push_uint(&bbuf, ipkg->replaces_priority, 10);
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));
		}
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		hlist_for_each_entry(diri, c1, &ipkg->owned_dirs, pkg_dirs_list) {
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			apk_blob_push_blob(&bbuf, APK_BLOB_STR("F:"));
			apk_blob_push_blob(&bbuf, APK_BLOB_PTR_LEN(diri->dir->name, diri->dir->namelen));
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("\nM:"));
			apk_blob_push_uint(&bbuf, diri->uid, 10);
			apk_blob_push_blob(&bbuf, APK_BLOB_STR(":"));
			apk_blob_push_uint(&bbuf, diri->gid, 10);
			apk_blob_push_blob(&bbuf, APK_BLOB_STR(":"));
			apk_blob_push_uint(&bbuf, diri->mode, 8);
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));
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			hlist_for_each_entry(file, c2, &diri->owned_files, diri_files_list) {
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				apk_blob_push_blob(&bbuf, APK_BLOB_STR("R:"));
				apk_blob_push_blob(&bbuf, APK_BLOB_PTR_LEN(file->name, file->namelen));
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				if (file->csum.type != APK_CHECKSUM_NONE) {
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					apk_blob_push_blob(&bbuf, APK_BLOB_STR("\nZ:"));
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					apk_blob_push_csum(&bbuf, &file->csum);
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				}
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				apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));
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				if (os->write(os, buf, bbuf.ptr - buf) != bbuf.ptr - buf)
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					return -1;
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				bbuf = APK_BLOB_BUF(buf);
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			}
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			if (os->write(os, buf, bbuf.ptr - buf) != bbuf.ptr - buf)
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				return -1;
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			bbuf = APK_BLOB_BUF(buf);
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		}
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		os->write(os, "\n", 1);
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	}

	return 0;
}

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static int apk_db_scriptdb_write(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_file_info fi;
	char filename[256];
	apk_blob_t bfn;
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	int r, i;
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	time_t now = time(NULL);
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	list_for_each_entry(ipkg, &db->installed.packages, installed_pkgs_list) {
		pkg = ipkg->pkg;

		for (i = 0; i < APK_SCRIPT_MAX; i++) {
			if (ipkg->script[i].ptr == NULL)
				continue;
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			fi = (struct apk_file_info) {
				.name = filename,
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				.size = ipkg->script[i].len,
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				.mode = 0755 | S_IFREG,
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				.mtime = now,
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			};
			/* The scripts db expects file names in format:
			 * pkg-version.<hexdump of package checksum>.action */
			bfn = APK_BLOB_BUF(filename);
			apk_blob_push_blob(&bfn, APK_BLOB_STR(pkg->name->name));
			apk_blob_push_blob(&bfn, APK_BLOB_STR("-"));
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			apk_blob_push_blob(&bfn, *pkg->version);
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			apk_blob_push_blob(&bfn, APK_BLOB_STR("."));
			apk_blob_push_csum(&bfn, &pkg->csum);
			apk_blob_push_blob(&bfn, APK_BLOB_STR("."));
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			apk_blob_push_blob(&bfn, APK_BLOB_STR(apk_script_types[i]));
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			apk_blob_push_blob(&bfn, APK_BLOB_PTR_LEN("", 1));

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			r = apk_tar_write_entry(os, &fi, ipkg->script[i].ptr);
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			if (r < 0)
				return r;
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		}
	}

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	return apk_tar_write_entry(os, NULL, NULL);
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}

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static int apk_read_script_archive_entry(void *ctx,
					 const struct apk_file_info *ae,
					 struct apk_istream *is)
{
	struct apk_database *db = (struct apk_database *) ctx;
	struct apk_package *pkg;
	char *fncsum, *fnaction;
	struct apk_checksum csum;
	apk_blob_t blob;
	int type;

	if (!S_ISREG(ae->mode))
		return 0;

	/* The scripts db expects file names in format:
	 * pkgname-version.<hexdump of package checksum>.action */
	fnaction = memrchr(ae->name, '.', strlen(ae->name));
	if (fnaction == NULL || fnaction == ae->name)
		return 0;
	fncsum = memrchr(ae->name, '.', fnaction - ae->name - 1);
	if (fncsum == NULL)
		return 0;
	fnaction++;
	fncsum++;

	/* Parse it */
	type = apk_script_type(fnaction);
	if (type == APK_SCRIPT_INVALID)
		return 0;
	blob = APK_BLOB_PTR_PTR(fncsum, fnaction - 2);
	apk_blob_pull_csum(&blob, &csum);

	/* Attach script */
	pkg = apk_db_get_pkg(db, &csum);
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	if (pkg != NULL && pkg->ipkg != NULL)
		apk_ipkg_add_script(pkg->ipkg, is, type, ae->size);
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	return 0;
}

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static int parse_triggers(void *ctx, apk_blob_t blob)
{
	struct apk_installed_package *ipkg = ctx;

	if (blob.len == 0)
		return 0;

	*apk_string_array_add(&ipkg->triggers) = apk_blob_cstr(blob);
	return 0;
}

static void apk_db_triggers_write(struct apk_database *db, struct apk_ostream *os)
{
	struct apk_installed_package *ipkg;
	char buf[APK_BLOB_CHECKSUM_BUF];
	apk_blob_t bfn;
	int i;

	list_for_each_entry(ipkg, &db->installed.triggers, trigger_pkgs_list) {
		bfn = APK_BLOB_BUF(buf);
		apk_blob_push_csum(&bfn, &ipkg->pkg->csum);
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		bfn = apk_blob_pushed(APK_BLOB_BUF(buf), bfn);
		os->write(os, bfn.ptr, bfn.len);
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		for (i = 0; i < ipkg->triggers->num; i++) {
			os->write(os, " ", 1);
			apk_ostream_write_string(os, ipkg->triggers->item[i]);
		}
		os->write(os, "\n", 1);
	}
}

static void apk_db_triggers_read(struct apk_database *db, struct apk_bstream *bs)
{
	struct apk_checksum csum;
	struct apk_package *pkg;
	struct apk_installed_package *ipkg;
	apk_blob_t l;

	while (!APK_BLOB_IS_NULL(l = bs->read(bs, APK_BLOB_STR("\n")))) {
		apk_blob_pull_csum(&l, &csum);
		apk_blob_pull_char(&l, ' ');

		pkg = apk_db_get_pkg(db, &csum);
		if (pkg == NULL || pkg->ipkg == NULL)
			continue;

		ipkg = pkg->ipkg;
		apk_blob_for_each_segment(l, " ", parse_triggers, ipkg);
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		if (ipkg->triggers->num != 0 &&
		    !list_hashed(&ipkg->trigger_pkgs_list))
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			list_add_tail(&ipkg->trigger_pkgs_list,
				      &db->installed.triggers);
	}
}

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static int apk_db_read_state(struct apk_database *db, int flags)
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{
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	struct apk_istream *is;
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	struct apk_bstream *bs;
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	apk_blob_t blob;
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	int r;
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	/* Read:
	 * 1. installed repository
	 * 2. source repositories
	 * 3. master dependencies
	 * 4. package statuses
	 * 5. files db
	 * 6. script db
	 */
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	if (!(flags & APK_OPENF_NO_WORLD)) {
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		blob = apk_blob_from_file(db->root_fd, apk_world_file);
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		if (APK_BLOB_IS_NULL(blob))
			return -ENOENT;
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		apk_blob_pull_deps(&blob, db, &db->world);
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		free(blob.ptr);
	}
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	if (!(flags & APK_OPENF_NO_INSTALLED)) {
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		bs = apk_bstream_from_file(db->root_fd, apk_installed_file);
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		if (bs != NULL) {
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			r = apk_db_index_read(db, bs, -1);
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			bs->close(bs, NULL);
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			if (r != 0)
				return -1;
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		}
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		bs = apk_bstream_from_file(db->root_fd, apk_triggers_file);
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		if (bs != NULL) {
			apk_db_triggers_read(db, bs);
			bs->close(bs, NULL);
		}
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	}

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	if (!(flags & APK_OPENF_NO_SCRIPTS)) {
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		is = apk_istream_from_file(db->root_fd, apk_scripts_file);
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		if (is != NULL) {
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			apk_tar_parse(is, apk_read_script_archive_entry, db,
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				      FALSE, &db->id_cache);
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			is->close(is);
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		}
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	}

	return 0;
}

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struct index_write_ctx {
	struct apk_ostream *os;
	int count;
	int force;
};

static int write_index_entry(apk_hash_item item, void *ctx)
{
	struct index_write_ctx *iwctx = (struct index_write_ctx *) ctx;
	struct apk_package *pkg = (struct apk_package *) item;
	int r;

	if (!iwctx->force && pkg->filename == NULL)
		return 0;

	r = apk_pkg_write_index_entry(pkg, iwctx->os);
	if (r < 0)
		return r;

	if (iwctx->os->write(iwctx->os, "\n", 1) != 1)
		return -1;

	iwctx->count++;
	return 0;
}

static int apk_db_index_write_nr_cache(struct apk_database *db)
{
	struct index_write_ctx ctx = { NULL, 0, TRUE };
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	struct apk_installed_package *ipkg;
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	struct apk_ostream *os;
	int r;

	if (!apk_db_cache_active(db))
		return 0;

	/* Write list of installed non-repository packages to
	 * cached index file */
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	os = apk_ostream_to_file(db->cache_fd,
				 "installed",
				 "installed.new",
				 0644);
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	if (os == NULL)
		return -1;

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	ctx.os = os;
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	list_for_each_entry(ipkg, &db->installed.packages, installed_pkgs_list) {
		if (ipkg->pkg->repos != 0)
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			continue;
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		r = write_index_entry(ipkg->pkg, &ctx);
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		if (r != 0)
			return r;
	}
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	r = os->close(os);
	if (r < 0)
		return r;
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	return ctx.count;
}

int apk_db_index_write(struct apk_database *db, struct apk_ostream *os)
{
	struct index_write_ctx ctx = { os, 0, FALSE };
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	int r;
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	r = apk_hash_foreach(&db->available.packages, write_index_entry, &ctx);
	if (r < 0)
		return r;
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	return ctx.count;
}

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static int add_protected_path(void *ctx, apk_blob_t blob)
{
	struct apk_database *db = (struct apk_database *) ctx;

	*apk_string_array_add(&db->protected_paths) = apk_blob_cstr(blob);
	return 0;
}

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static int apk_db_create(struct apk_database *db)
{
	int fd;

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	mkdirat(db->root_fd, "tmp", 01777);
	mkdirat(db->root_fd, "dev", 0755);
	mknodat(db->root_fd, "dev/null", 0666, makedev(1, 3));
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	mkdirat(db->root_fd, "etc", 0755);
	mkdirat(db->root_fd, "etc/apk", 0755);
	mkdirat(db->root_fd, "lib", 0755);
	mkdirat(db->root_fd, "lib/apk", 0755);
	mkdirat(db->root_fd, "lib/apk/db", 0755);
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	mkdirat(db->root_fd, "var", 0755);
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	mkdirat(db->root_fd, "var/cache", 0755);
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	mkdirat(db->root_fd, "var/cache/apk", 0755);
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	mkdirat(db->root_fd, "var/cache/misc", 0755);
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	mkdirat(db->root_fd, "var/lock", 0755);
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	fd = openat(db->root_fd, apk_world_file, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC, 0644);
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	if (fd < 0)
		return -errno;
	close(fd);

	return 0;
}

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static void handle_alarm(int sig)
{
}

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static char *find_mountpoint(int atfd, const char *rel_path)
{
	struct mntent *me;
	struct stat64 st;
	FILE *f;
	char *ret = NULL;
	dev_t dev;

	if (fstatat64(atfd, rel_path, &st, 0) != 0)
		return NULL;
	dev = st.st_dev;

	f = setmntent("/proc/mounts", "r");
	if (f == NULL)
		return NULL;
	while ((me = getmntent(f)) != NULL) {
		if (strcmp(me->mnt_fsname, "rootfs") == 0)
			continue;
		if (fstatat64(atfd, me->mnt_dir, &st, 0) == 0 &&
		    st.st_dev == dev) {
			ret = strdup(me->mnt_dir);
			break;
		}
	}
	endmntent(f);

	return ret;
}

static int do_remount(const char *path, const char *option)
{
	pid_t pid;
	int status;

	pid = fork();
	if (pid < 0)
		return -errno;

	if (pid == 0) {
		execl("/bin/mount", "mount", "-o", "remount", "-o",
		      option, path, NULL);
		return 1;
	}

	waitpid(pid, &status, 0);
	if (!WIFEXITED(status))
		return -1;

	return WEXITSTATUS(status);
}

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static void relocate_database(struct apk_database *db)
{
	mkdirat(db->root_fd, "etc", 0755);
	mkdirat(db->root_fd, "etc/apk", 0755);
	mkdirat(db->root_fd, "lib", 0755);
	mkdirat(db->root_fd, "lib/apk", 0755);
	mkdirat(db->root_fd, "lib/apk/db", 0755);
	mkdirat(db->root_fd, "var", 0755);
	mkdirat(db->root_fd, "var/cache", 0755);
	mkdirat(db->root_fd, "var/cache/apk", 0755);
	mkdirat(db->root_fd, "var/cache/misc", 0755);
	mkdirat(db->root_fd, "var/lock", 0755);
	apk_move_file(db->root_fd, apk_world_file_old, apk_world_file);
	apk_move_file(db->root_fd, apk_scripts_file_old, apk_scripts_file);
	apk_move_file(db->root_fd, apk_triggers_file_old, apk_triggers_file);
	apk_move_file(db->root_fd, apk_installed_file_old, apk_installed_file);
}

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int apk_db_open(struct apk_database *db, struct apk_db_options *dbopts)
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{
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	const char *msg = NULL;
	struct apk_repository_list *repo = NULL;
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	struct apk_bstream *bs;
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	struct statfs stfs;
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	apk_blob_t blob;
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	int r, fd, rr = 0;
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	memset(db, 0, sizeof(*db));
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	if (apk_flags & APK_SIMULATE) {
		dbopts->open_flags &= ~(APK_OPENF_CREATE | APK_OPENF_WRITE);
		dbopts->open_flags |= APK_OPENF_READ;
	}
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	if (dbopts->open_flags == 0) {
		msg = "Invalid open flags (internal error)";
		r = -1;
		goto ret_r;
	}

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	apk_hash_init(&db->available.names, &pkg_name_hash_ops, 1000);
	apk_hash_init(&db->available.packages, &pkg_info_hash_ops, 4000);
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	apk_hash_init(&db->installed.dirs, &dir_hash_ops, 2000);
	apk_hash_init(&db->installed.files, &file_hash_ops, 10000);
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	list_init(&db->installed.packages);
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	list_init(&db->installed.triggers);
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	apk_dependency_array_init(&db->world);
	apk_string_array_init(&db->protected_paths);
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	db->permanent = 1;
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	/* Get first repository tag (the NULL tag) */
	apk_db_get_tag_id(db, APK_BLOB_NULL);

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	if (dbopts->root && dbopts->arch) {
		db->arch = apk_blob_atomize(APK_BLOB_STR(dbopts->arch));
	} else {
		db->arch = apk_blob_atomize(APK_BLOB_STR(APK_DEFAULT_ARCH));
	}
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	db->root = strdup(dbopts->root ?: "/");
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	db->root_fd = openat(AT_FDCWD, db->root, O_RDONLY | O_CLOEXEC);
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	if (db->root_fd < 0 && (dbopts->open_flags & APK_OPENF_CREATE)) {