xbps/lib/pkgdb.c

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/*-
* Copyright (c) 2012-2020 Juan Romero Pardines.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "xbps_api_impl.h"
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/**
* @file lib/pkgdb.c
* @brief Package database handling routines
* @defgroup pkgdb Package database handling functions
*
* Functions to manipulate the main package database plist file (pkgdb).
*
* The following image shown below shows the proplib structure used
* by the main package database plist:
*
* @image html images/xbps_pkgdb_dictionary.png
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*
* Legend:
* - <b>Salmon filled box</b>: \a pkgdb plist internalized.
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* - <b>White filled box</b>: mandatory objects.
* - <b>Grey filled box</b>: optional objects.
* - <b>Green filled box</b>: possible value set in the object, only one
* of them is set.
*
* Text inside of white boxes are the key associated with the object, its
* data type is specified on its edge, i.e array, bool, integer, string,
* dictionary.
*/
static int pkgdb_fd = -1;
static bool pkgdb_map_names_done = false;
int
xbps_pkgdb_lock(struct xbps_handle *xhp)
{
mode_t prev_umask;
int rv = 0;
/*
* Use a mandatory file lock to only allow one writer to pkgdb,
* other writers will block.
*/
prev_umask = umask(022);
xhp->pkgdb_plist = xbps_xasprintf("%s/%s", xhp->metadir, XBPS_PKGDB);
if (xbps_pkgdb_init(xhp) == ENOENT) {
/* if metadir does not exist, create it */
if (access(xhp->metadir, R_OK|X_OK) == -1) {
if (errno != ENOENT) {
rv = errno;
goto ret;
}
if (xbps_mkpath(xhp->metadir, 0755) == -1) {
rv = errno;
xbps_dbg_printf("[pkgdb] failed to create metadir "
"%s: %s\n", xhp->metadir, strerror(rv));
goto ret;
}
}
/* if pkgdb is unexistent, create it with an empty dictionary */
xhp->pkgdb = xbps_dictionary_create();
if (!xbps_dictionary_externalize_to_file(xhp->pkgdb, xhp->pkgdb_plist)) {
rv = errno;
xbps_dbg_printf("[pkgdb] failed to create pkgdb "
"%s: %s\n", xhp->pkgdb_plist, strerror(rv));
goto ret;
}
}
if ((pkgdb_fd = open(xhp->pkgdb_plist, O_CREAT|O_RDWR|O_CLOEXEC, 0664)) == -1) {
rv = errno;
xbps_dbg_printf("[pkgdb] cannot open pkgdb for locking "
"%s: %s\n", xhp->pkgdb_plist, strerror(rv));
free(xhp->pkgdb_plist);
goto ret;
}
/*
* If we've acquired the file lock, then pkgdb is writable.
*/
if (lockf(pkgdb_fd, F_TLOCK, 0) == -1) {
rv = errno;
xbps_dbg_printf("[pkgdb] cannot lock pkgdb: %s\n", strerror(rv));
}
/*
* Check if rootdir is writable.
*/
if (access(xhp->rootdir, W_OK) == -1) {
rv = errno;
xbps_dbg_printf("[pkgdb] rootdir %s: %s\n", xhp->rootdir, strerror(rv));
}
ret:
umask(prev_umask);
return rv;
}
void
xbps_pkgdb_unlock(struct xbps_handle *xhp UNUSED)
{
xbps_dbg_printf("%s: pkgdb_fd %d\n", __func__, pkgdb_fd);
if (pkgdb_fd != -1) {
if (lockf(pkgdb_fd, F_ULOCK, 0) == -1)
xbps_dbg_printf("[pkgdb] failed to unlock pkgdb: %s\n", strerror(errno));
(void)close(pkgdb_fd);
pkgdb_fd = -1;
}
}
static int
pkgdb_map_vpkgs(struct xbps_handle *xhp)
{
xbps_object_iterator_t iter;
xbps_object_t obj;
int rv = 0;
if (!xbps_dictionary_count(xhp->pkgdb))
return 0;
if (xhp->vpkgd == NULL) {
xhp->vpkgd = xbps_dictionary_create();
assert(xhp->vpkgd);
}
/*
* This maps all pkgs that have virtualpkgs in pkgdb.
*/
iter = xbps_dictionary_iterator(xhp->pkgdb);
assert(iter);
while ((obj = xbps_object_iterator_next(iter))) {
xbps_array_t provides;
xbps_dictionary_t pkgd;
const char *pkgver = NULL;
char pkgname[XBPS_NAME_SIZE] = {0};
unsigned int cnt;
pkgd = xbps_dictionary_get_keysym(xhp->pkgdb, obj);
provides = xbps_dictionary_get(pkgd, "provides");
cnt = xbps_array_count(provides);
if (!cnt)
continue;
xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver)) {
rv = EINVAL;
goto out;
}
for (unsigned int i = 0; i < cnt; i++) {
const char *vpkg = NULL;
xbps_array_get_cstring_nocopy(provides, i, &vpkg);
if (!xbps_dictionary_set_cstring(xhp->vpkgd, vpkg, pkgname)) {
xbps_dbg_printf("%s: set_cstring vpkg "
"%s pkgname %s\n", __func__, vpkg, pkgname);
rv = EINVAL;
goto out;
}
xbps_dbg_printf("[pkgdb] added vpkg %s for %s\n", vpkg, pkgname);
}
}
out:
xbps_object_iterator_release(iter);
return rv;
}
static int
pkgdb_map_names(struct xbps_handle *xhp)
{
xbps_object_iterator_t iter;
xbps_object_t obj;
int rv = 0;
if (pkgdb_map_names_done || !xbps_dictionary_count(xhp->pkgdb))
return 0;
/*
* This maps all pkgs in pkgdb to have the "pkgname" string property.
* This way we do it once and not multiple times.
*/
iter = xbps_dictionary_iterator(xhp->pkgdb);
assert(iter);
while ((obj = xbps_object_iterator_next(iter))) {
xbps_dictionary_t pkgd;
const char *pkgver;
char pkgname[XBPS_NAME_SIZE] = {0};
pkgd = xbps_dictionary_get_keysym(xhp->pkgdb, obj);
if (!xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver)) {
continue;
}
if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver)) {
rv = EINVAL;
break;
}
if (!xbps_dictionary_set_cstring(pkgd, "pkgname", pkgname)) {
rv = EINVAL;
break;
}
}
xbps_object_iterator_release(iter);
if (!rv) {
pkgdb_map_names_done = true;
}
return rv;
}
int HIDDEN
xbps_pkgdb_init(struct xbps_handle *xhp)
{
int rv;
assert(xhp);
if (xhp->pkgdb)
return 0;
if (!xhp->pkgdb_plist)
xhp->pkgdb_plist = xbps_xasprintf("%s/%s", xhp->metadir, XBPS_PKGDB);
#if 0
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if ((rv = xbps_pkgdb_conversion(xhp)) != 0)
return rv;
#endif
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if ((rv = xbps_pkgdb_update(xhp, false, true)) != 0) {
if (rv != ENOENT)
xbps_dbg_printf("[pkgdb] cannot internalize "
"pkgdb dictionary: %s\n", strerror(rv));
return rv;
}
if ((rv = pkgdb_map_names(xhp)) != 0) {
xbps_dbg_printf("[pkgdb] pkgdb_map_names %s\n", strerror(rv));
return rv;
}
if ((rv = pkgdb_map_vpkgs(xhp)) != 0) {
xbps_dbg_printf("[pkgdb] pkgdb_map_vpkgs %s\n", strerror(rv));
return rv;
}
assert(xhp->pkgdb);
xbps_dbg_printf("[pkgdb] initialized ok.\n");
return 0;
}
int
xbps_pkgdb_update(struct xbps_handle *xhp, bool flush, bool update)
{
xbps_dictionary_t pkgdb_storage;
mode_t prev_umask;
static int cached_rv;
int rv = 0;
if (cached_rv && !flush)
return cached_rv;
if (xhp->pkgdb && flush) {
pkgdb_storage = xbps_dictionary_internalize_from_file(xhp->pkgdb_plist);
if (pkgdb_storage == NULL ||
!xbps_dictionary_equals(xhp->pkgdb, pkgdb_storage)) {
/* flush dictionary to storage */
prev_umask = umask(022);
if (!xbps_dictionary_externalize_to_file(xhp->pkgdb, xhp->pkgdb_plist)) {
umask(prev_umask);
return errno;
}
umask(prev_umask);
}
if (pkgdb_storage)
xbps_object_release(pkgdb_storage);
xbps_object_release(xhp->pkgdb);
xhp->pkgdb = NULL;
cached_rv = 0;
}
if (!update)
return rv;
/* update copy in memory */
if ((xhp->pkgdb = xbps_dictionary_internalize_from_file(xhp->pkgdb_plist)) == NULL) {
rv = errno;
if (!rv)
rv = EINVAL;
if (rv == ENOENT)
xhp->pkgdb = xbps_dictionary_create();
else
xbps_error_printf("cannot access to pkgdb: %s\n", strerror(rv));
cached_rv = rv = errno;
}
return rv;
}
void HIDDEN
xbps_pkgdb_release(struct xbps_handle *xhp)
{
assert(xhp);
xbps_pkgdb_unlock(xhp);
if (xhp->pkgdb)
xbps_object_release(xhp->pkgdb);
xbps_dbg_printf("[pkgdb] released ok.\n");
}
int
xbps_pkgdb_foreach_cb(struct xbps_handle *xhp,
int (*fn)(struct xbps_handle *, xbps_object_t, const char *, void *, bool *),
void *arg)
{
xbps_array_t allkeys;
int rv;
if ((rv = xbps_pkgdb_init(xhp)) != 0)
return rv;
allkeys = xbps_dictionary_all_keys(xhp->pkgdb);
assert(allkeys);
rv = xbps_array_foreach_cb(xhp, allkeys, xhp->pkgdb, fn, arg);
xbps_object_release(allkeys);
return rv;
}
int
xbps_pkgdb_foreach_cb_multi(struct xbps_handle *xhp,
int (*fn)(struct xbps_handle *, xbps_object_t, const char *, void *, bool *),
void *arg)
{
xbps_array_t allkeys;
int rv;
if ((rv = xbps_pkgdb_init(xhp)) != 0)
return rv;
allkeys = xbps_dictionary_all_keys(xhp->pkgdb);
assert(allkeys);
rv = xbps_array_foreach_cb_multi(xhp, allkeys, xhp->pkgdb, fn, arg);
xbps_object_release(allkeys);
return rv;
}
xbps_dictionary_t
xbps_pkgdb_get_pkg(struct xbps_handle *xhp, const char *pkg)
{
if (xbps_pkgdb_init(xhp) != 0)
return NULL;
return xbps_find_pkg_in_dict(xhp->pkgdb, pkg);
}
xbps_dictionary_t
xbps_pkgdb_get_virtualpkg(struct xbps_handle *xhp, const char *vpkg)
{
if (xbps_pkgdb_init(xhp) != 0)
return NULL;
return xbps_find_virtualpkg_in_dict(xhp, xhp->pkgdb, vpkg);
}
static void
generate_full_revdeps_tree(struct xbps_handle *xhp)
{
xbps_object_t obj;
xbps_object_iterator_t iter;
if (xhp->pkgdb_revdeps)
return;
xhp->pkgdb_revdeps = xbps_dictionary_create();
assert(xhp->pkgdb_revdeps);
iter = xbps_dictionary_iterator(xhp->pkgdb);
assert(iter);
while ((obj = xbps_object_iterator_next(iter))) {
xbps_array_t rundeps;
xbps_dictionary_t pkgd;
const char *pkgver = NULL;
pkgd = xbps_dictionary_get_keysym(xhp->pkgdb, obj);
rundeps = xbps_dictionary_get(pkgd, "run_depends");
if (!xbps_array_count(rundeps))
continue;
xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
for (unsigned int i = 0; i < xbps_array_count(rundeps); i++) {
xbps_array_t pkg;
const char *pkgdep = NULL, *vpkgname = NULL;
char *v, curpkgname[XBPS_NAME_SIZE];
bool alloc = false;
xbps_array_get_cstring_nocopy(rundeps, i, &pkgdep);
if ((!xbps_pkgpattern_name(curpkgname, sizeof(curpkgname), pkgdep)) &&
(!xbps_pkg_name(curpkgname, sizeof(curpkgname), pkgdep))) {
abort();
}
vpkgname = vpkg_user_conf(xhp, curpkgname, false);
if (vpkgname == NULL) {
v = strdup(curpkgname);
} else {
v = strdup(vpkgname);
}
pkg = xbps_dictionary_get(xhp->pkgdb_revdeps, v);
if (pkg == NULL) {
alloc = true;
pkg = xbps_array_create();
}
if (!xbps_match_string_in_array(pkg, pkgver)) {
xbps_array_add_cstring_nocopy(pkg, pkgver);
xbps_dictionary_set(xhp->pkgdb_revdeps, v, pkg);
}
free(v);
if (alloc)
xbps_object_release(pkg);
}
}
xbps_object_iterator_release(iter);
}
xbps_array_t
xbps_pkgdb_get_pkg_revdeps(struct xbps_handle *xhp, const char *pkg)
{
xbps_dictionary_t pkgd;
const char *pkgver = NULL;
char pkgname[XBPS_NAME_SIZE];
if ((pkgd = xbps_pkgdb_get_pkg(xhp, pkg)) == NULL)
return NULL;
generate_full_revdeps_tree(xhp);
xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver))
return NULL;
return xbps_dictionary_get(xhp->pkgdb_revdeps, pkgname);
}
xbps_array_t
xbps_pkgdb_get_pkg_fulldeptree(struct xbps_handle *xhp, const char *pkg)
{
return xbps_get_pkg_fulldeptree(xhp, pkg, false);
}
xbps_dictionary_t
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xbps_pkgdb_get_pkg_files(struct xbps_handle *xhp, const char *pkg)
{
xbps_dictionary_t pkgd;
const char *pkgver = NULL;
char pkgname[XBPS_NAME_SIZE], plist[PATH_MAX];
if (pkg == NULL)
return NULL;
pkgd = xbps_pkgdb_get_pkg(xhp, pkg);
if (pkgd == NULL)
return NULL;
xbps_dictionary_get_cstring_nocopy(pkgd, "pkgver", &pkgver);
if (!xbps_pkg_name(pkgname, sizeof(pkgname), pkgver))
return NULL;
snprintf(plist, sizeof(plist)-1, "%s/.%s-files.plist", xhp->metadir, pkgname);
return xbps_plist_dictionary_from_file(plist);
}