database.c

/* database.c - Alpine Package Keeper (APK)
 *
 * Copyright (C) 2005-2008 Natanael Copa <n@tanael.org>
 * Copyright (C) 2008-2011 Timo Teräs <timo.teras@iki.fi>
 * All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * 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>
#include <mntent.h>
#include <limits.h>
#include <unistd.h>
#include <malloc.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <fnmatch.h>
#include <sys/vfs.h>
#include <sys/file.h>
#include <sys/wait.h>
#include <sys/stat.h>
#include <sys/statvfs.h>

#include "apk_defines.h"
#include "apk_package.h"
#include "apk_database.h"
#include "apk_applet.h"
#include "apk_archive.h"
#include "apk_print.h"

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

enum {
	APK_DISALLOW_RMDIR = 0,
	APK_ALLOW_RMDIR = 1
};

int apk_verbosity = 1;
unsigned int apk_flags = 0;

const char * const apkindex_tar_gz = "APKINDEX.tar.gz";
static const char * const apk_static_cache_dir = "var/cache/apk";
static const char * const apk_linked_cache_dir = "etc/apk/cache";

static const char * const apk_lock_file = "var/lock/apkdb";

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_arch_file = "etc/apk/arch";

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";

struct install_ctx {
	struct apk_database *db;
	struct apk_package *pkg;
	struct apk_installed_package *ipkg;

	int script;
	char **script_args;
	int script_pending : 1;

	struct apk_db_dir_instance *diri;
	struct apk_checksum data_csum;
	struct apk_sign_ctx sctx;

	apk_progress_cb cb;
	void *cb_ctx;
	size_t installed_size;
	size_t current_file_size;

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

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

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

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

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

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

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

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

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,
	.hash_key = apk_blob_hash,
	.compare = apk_blob_compare,
	.delete_item = (apk_hash_delete_f) free,
};

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)
{
	struct apk_db_file_hash_key *key = (struct apk_db_file_hash_key *) _key.ptr;

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

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

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

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;
	struct apk_db_dir *dir = dbf->diri->dir;
	int r;

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

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

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

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);
}

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

	pn = (struct apk_name *) apk_hash_get_hashed(&db->available.names, name, hash);
	if (pn != NULL)
		return pn;

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

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

	return pn;
}

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

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

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

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

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

	db->installed.stats.dirs--;

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

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

	if (dir->parent != NULL)
		apk_db_dir_unref(db, dir->parent, allow_rmdir);
}

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

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

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

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

	dir = (struct apk_db_dir *) apk_hash_get_hashed(&db->installed.dirs, name, hash);
	if (dir != NULL)
		return apk_db_dir_ref(dir);

	db->installed.stats.dirs++;
	dir = malloc(sizeof(*dir) + name.len + 1);
	memset(dir, 0, sizeof(*dir));
	dir->refs = 1;
	dir->uid = (uid_t) -1;
	dir->gid = (gid_t) -1;
	dir->rooted_name[0] = '/';
	memcpy(dir->name, name.ptr, name.len);
	dir->name[name.len] = 0;
	dir->namelen = name.len;
	dir->hash = hash;
	apk_protected_path_array_init(&dir->protected_paths);
	apk_hash_insert_hashed(&db->installed.dirs, dir, hash);

	if (name.len == 0) {
		dir->parent = NULL;
		dir->has_protected_children = 1;
		ppaths = NULL;
	} else if (apk_blob_rsplit(name, '/', &bparent, NULL)) {
		dir->parent = apk_db_dir_get(db, bparent);
		dir->protected = dir->parent->protected;
		dir->has_protected_children = dir->protected;
		dir->symlinks_only = dir->parent->symlinks_only;
		ppaths = dir->parent->protected_paths;
	} else {
		dir->parent = apk_db_dir_get(db, APK_BLOB_NULL);
		ppaths = db->protected_paths;
	}

	if (ppaths == NULL)
		return dir;

	relative_name = strrchr(dir->rooted_name, '/') + 1;
	for (i = 0; i < ppaths->num; i++) {
		struct apk_protected_path *ppath = &ppaths->item[i];
		char *slash;

		slash = strchr(ppath->relative_pattern, '/');
		if (slash != NULL) {
			*slash = 0;
			if (fnmatch(ppath->relative_pattern, relative_name, FNM_PATHNAME) != 0) {
				*slash = '/';
				continue;
			}
			*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;

			dir->protected = ppath->protected;
			dir->symlinks_only = ppath->symlinks_only;
		}
		dir->has_protected_children |= ppath->protected;
	}

	return dir;
}

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

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

	return diri;
}

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

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

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

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

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

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;

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

	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));
}

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;
}

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;
}

static struct apk_db_file *apk_db_file_get(struct apk_database *db,
					   struct apk_db_dir_instance *diri,
					   apk_blob_t name,
					   struct hlist_node ***after)
{
	struct apk_db_file *file;
	struct apk_db_file_hash_key key;
	struct apk_db_dir *dir = diri->dir;
	unsigned long hash;

	key = (struct apk_db_file_hash_key) {
		.dirname = APK_BLOB_PTR_LEN(dir->name, dir->namelen),
		.filename = name,
	};

	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);
	if (file != NULL)
		return file;

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

	return file;
}

static void apk_db_pkg_rdepends(struct apk_database *db, struct apk_package *pkg)
{
	int i, j;
	struct apk_name *rname;

	for (i = 0; i < pkg->depends->num; i++) {
		rname = pkg->depends->item[i].name;
		for (j = 0; j < rname->rdepends->num; j++)
			if (rname->rdepends->item[j] == pkg->name)
				goto rdeps_done;
		*apk_name_array_add(&rname->rdepends) = pkg->name;
	}
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;
}

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

struct apk_package *apk_db_pkg_add(struct apk_database *db, struct apk_package *pkg)
{
	struct apk_package *idb;
	int i;

	if (pkg->license == NULL)
		pkg->license = apk_blob_atomize(APK_BLOB_NULL);

	/* 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);

	idb = apk_hash_get(&db->available.packages, APK_BLOB_CSUM(pkg->csum));
	if (idb == NULL) {
		idb = pkg;
		apk_hash_insert(&db->available.packages, pkg);
		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));
		}
		apk_db_pkg_rdepends(db, pkg);
	} else {
		idb->repos |= pkg->repos;
		if (idb->filename == NULL && pkg->filename != NULL) {
			idb->filename = pkg->filename;
			pkg->filename = NULL;
		}
		if (idb->ipkg == NULL && pkg->ipkg != NULL) {
			idb->ipkg = pkg->ipkg;
			idb->ipkg->pkg = idb;
			pkg->ipkg = NULL;
		}
		apk_pkg_free(pkg);
	}
	return idb;
}

void apk_cache_format_index(apk_blob_t to, struct apk_repository *repo)
{
	/* APKINDEX.12345678.tar.gz */
	apk_blob_push_blob(&to, APK_BLOB_STR("APKINDEX."));
	apk_blob_push_hexdump(&to, APK_BLOB_PTR_LEN((char *) repo->csum.data,
						    APK_CACHE_CSUM_BYTES));
	apk_blob_push_blob(&to, APK_BLOB_STR(".tar.gz"));
	apk_blob_push_blob(&to, APK_BLOB_PTR_LEN("", 1));
}

int apk_cache_download(struct apk_database *db, const char *url, apk_blob_t *arch,
		       const char *item, const char *cacheitem, int verify)
{
	char fullurl[PATH_MAX];
	int r;

	apk_repo_format_filename(fullurl, sizeof(fullurl), url, arch, item);
	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);

		r = apk_tar_parse(is, apk_sign_ctx_verify_tar, &sctx, FALSE, &db->id_cache);
		is->close(is);
		apk_sign_ctx_free(&sctx);
		if (r != 0) {
			unlinkat(db->cachetmp_fd, cacheitem, 0);
			return r;
		}
	}

	if (db->cachetmp_fd != db->cache_fd) {
		if (renameat(db->cachetmp_fd, cacheitem, db->cache_fd, cacheitem) < 0)
			return -errno;
	}

	return 0;
}

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;
}

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

	return 0;
}

int apk_db_index_read(struct apk_database *db, struct apk_bstream *bs, int repo)
{
	struct apk_package *pkg = NULL;
	struct apk_installed_package *ipkg = NULL;
	struct apk_db_dir_instance *diri = NULL;
	struct apk_db_file *file = NULL;
	struct hlist_node **diri_node = NULL;
	struct hlist_node **file_diri_node = NULL;
	apk_blob_t token = APK_BLOB_STR("\n"), l;
	mode_t mode;
	uid_t uid;
	gid_t gid;
	int field, r;

	while (!APK_BLOB_IS_NULL(l = bs->read(bs, token))) {
		if (l.len < 2 || l.ptr[1] != ':') {
			if (pkg == NULL)
				continue;

			if (repo >= 0) {
				pkg->repos |= BIT(repo);
			} else if (repo == -1 && ipkg == NULL) {
				/* Installed package without files */
				ipkg = apk_pkg_install(db, pkg);
			}

			if (apk_db_pkg_add(db, pkg) == NULL) {
				apk_error("Installed database load failed");
				return -1;
			}
			pkg = NULL;
			ipkg = NULL;
			continue;
		}

		/* Get field */
		field = l.ptr[0];
		l.ptr += 2;
		l.len -= 2;

		/* If no package, create new */
		if (pkg == NULL) {
			pkg = apk_pkg_new();
			ipkg = NULL;
			diri = NULL;
			file_diri_node = NULL;
		}

		/* Standard index line? */
		r = apk_pkg_add_info(db, pkg, field, l);
		if (r == 0) {
			continue;
		}
		if (r == 1 && repo == -1 && ipkg == NULL) {
			/* 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);
		}
		if (repo != -1 || ipkg == NULL)
			continue;

		/* Check FDB special entries */
		switch (field) {
		case 'F':
			if (pkg->name == NULL) {
				apk_error("FDB directory entry before package entry");
				return -1;
			}
			diri = apk_db_diri_new(db, pkg, l, &diri_node);
			file_diri_node = &diri->owned_files.first;
			break;
		case 'a':
			if (file == NULL) {
				apk_error("FDB file attribute metadata entry before file entry");
				return -1;
			}
		case 'M':
			if (diri == NULL) {
				apk_error("FDB directory metadata entry before directory entry");
				return -1;
			}
			uid = apk_blob_pull_uint(&l, 10);
			apk_blob_pull_char(&l, ':');
			gid = apk_blob_pull_uint(&l, 10);
			apk_blob_pull_char(&l, ':');
			mode = apk_blob_pull_uint(&l, 8);
			if (field == 'M')
				apk_db_diri_set(diri, mode, uid, gid);
			else
				apk_db_file_set(file, mode, uid, gid);
			break;
		case 'R':
			if (diri == NULL) {
				apk_error("FDB file entry before directory entry");
				return -1;
			}
			file = apk_db_file_get(db, diri, l, &file_diri_node);
			break;
		case 'Z':
			if (file == NULL) {
				apk_error("FDB checksum entry before file entry");
				return -1;
			}
			apk_blob_pull_csum(&l, &file->csum);
			break;
		case 'r':
			apk_blob_pull_deps(&l, db, &ipkg->replaces);
			break;
		case 'q':
			ipkg->replaces_priority = apk_blob_pull_uint(&l, 10);
			break;
		case 'p':
		case 's':
			ipkg->repository_tag = apk_db_get_tag_id(db, l);
			break;
		default:
			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;
		}
		if (APK_BLOB_IS_NULL(l)) {
			apk_error("FDB format error in entry '%c'", field);
			return -1;
		}
	}

	return 0;
}

static int apk_db_write_fdb(struct apk_database *db, struct apk_ostream *os)
{
	struct apk_installed_package *ipkg;
	struct apk_package *pkg;
	struct apk_db_dir_instance *diri;
	struct apk_db_file *file;
	struct hlist_node *c1, *c2;
	char buf[1024];
	apk_blob_t bbuf = APK_BLOB_BUF(buf);
	int r;

	list_for_each_entry(ipkg, &db->installed.packages, installed_pkgs_list) {
		pkg = ipkg->pkg;
		r = apk_pkg_write_index_entry(pkg, os);
		if (r < 0)
			return r;

		if (ipkg->replaces->num) {
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("r:"));
			apk_blob_push_deps(&bbuf, db, ipkg->replaces);
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));
		}
		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"));
		}
		if (ipkg->repository_tag) {
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("s:"));
			apk_blob_push_blob(&bbuf, *db->repo_tags[ipkg->repository_tag].name);
			apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));
		}
		hlist_for_each_entry(diri, c1, &ipkg->owned_dirs, pkg_dirs_list) {
			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"));

			hlist_for_each_entry(file, c2, &diri->owned_files, diri_files_list) {
				apk_blob_push_blob(&bbuf, APK_BLOB_STR("R:"));
				apk_blob_push_blob(&bbuf, APK_BLOB_PTR_LEN(file->name, file->namelen));
				if (file->mode != 0 || file->uid != 0 || file->gid != 0) {
					apk_blob_push_blob(&bbuf, APK_BLOB_STR("\na:"));
					apk_blob_push_uint(&bbuf, file->uid, 10);
					apk_blob_push_blob(&bbuf, APK_BLOB_STR(":"));
					apk_blob_push_uint(&bbuf, file->gid, 10);
					apk_blob_push_blob(&bbuf, APK_BLOB_STR(":"));
					apk_blob_push_uint(&bbuf, file->mode, 8);
				}
				if (file->csum.type != APK_CHECKSUM_NONE) {
					apk_blob_push_blob(&bbuf, APK_BLOB_STR("\nZ:"));
					apk_blob_push_csum(&bbuf, &file->csum);
				}
				apk_blob_push_blob(&bbuf, APK_BLOB_STR("\n"));

				if (os->write(os, buf, bbuf.ptr - buf) != bbuf.ptr - buf)
					return -EIO;
				bbuf = APK_BLOB_BUF(buf);
			}
			if (os->write(os, buf, bbuf.ptr - buf) != bbuf.ptr - buf)
				return -EIO;
			bbuf = APK_BLOB_BUF(buf);
		}
		os->write(os, "\n", 1);
	}

	return 0;
}

static int apk_db_scriptdb_write(struct apk_database *db, struct apk_ostream *os)
{
	struct apk_installed_package *ipkg;
	struct apk_package *pkg;
	struct apk_file_info fi;
	char filename[256];
	apk_blob_t bfn;
	int r, i;
	time_t now = time(NULL);

	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;

			fi = (struct apk_file_info) {
				.name = filename,
				.size = ipkg->script[i].len,
				.mode = 0755 | S_IFREG,
				.mtime = now,
			};
			/* 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("-"));
			apk_blob_push_blob(&bfn, *pkg->version);
			apk_blob_push_blob(&bfn, APK_BLOB_STR("."));
			apk_blob_push_csum(&bfn, &pkg->csum);
			apk_blob_push_blob(&bfn, APK_BLOB_STR("."));
			apk_blob_push_blob(&bfn, APK_BLOB_STR(apk_script_types[i]));
			apk_blob_push_blob(&bfn, APK_BLOB_PTR_LEN("", 1));

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