void-packages/lib/sortdeps.c
Juan RP 37725c0e97 xbps_sort_pkg_deps: there's no need to sort direct/indirect in two passes.
--HG--
extra : convert_revision : a6666b0605f34ac2440c61d09f25831dee9e67fa
2009-02-14 06:06:01 +01:00

289 lines
7.3 KiB
C

/*-
* Copyright (c) 2009 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 <stdio.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <xbps_api.h>
struct sorted_dependency {
SIMPLEQ_ENTRY(sorted_dependency) chain;
prop_dictionary_t dict;
prop_array_t reqby;
size_t idx;
size_t prio;
};
static SIMPLEQ_HEAD(sdep_head, sorted_dependency) sdep_list =
SIMPLEQ_HEAD_INITIALIZER(sdep_list);
static ssize_t
find_pkgdict_with_highest_prio(prop_array_t array, uint32_t *maxprio)
{
prop_object_t obj;
prop_object_iterator_t iter;
uint32_t prio = 0;
size_t idx = 0;
ssize_t curidx = -1;
assert(array != NULL);
iter = prop_array_iterator(array);
if (iter == NULL) {
errno = ENOMEM;
return -1;
}
/*
* Finds the index of a package with the highest priority.
*/
while ((obj = prop_object_iterator_next(iter)) != NULL) {
prop_dictionary_get_uint32(obj, "priority", &prio);
if (*maxprio <= prio) {
curidx = idx;
*maxprio = prio;
}
idx++;
}
prop_object_iterator_release(iter);
if (curidx == -1)
errno = ENOENT;
return curidx;
}
static struct sorted_dependency *
find_sorteddep_with_highest_prio(void)
{
struct sorted_dependency *sdep;
size_t maxprio = 0;
size_t curidx = 0, idx = 0;
SIMPLEQ_FOREACH(sdep, &sdep_list, chain) {
if (maxprio <= sdep->prio) {
curidx = idx;
maxprio = sdep->prio;
}
idx++;
}
idx = 0;
SIMPLEQ_FOREACH(sdep, &sdep_list, chain) {
if (idx == curidx)
break;
idx++;
}
return sdep;
}
static struct sorted_dependency *
find_sorteddep_by_name(const char *pkgname)
{
struct sorted_dependency *sdep;
const char *curname;
SIMPLEQ_FOREACH(sdep, &sdep_list, chain) {
prop_dictionary_get_cstring_nocopy(sdep->dict,
"pkgname", &curname);
if (strcmp(pkgname, curname) == 0)
break;
}
return sdep;
}
int
xbps_sort_pkg_deps(prop_dictionary_t chaindeps)
{
prop_array_t sorted, unsorted, rundeps_array, reqby;
prop_dictionary_t dict;
prop_object_t obj;
prop_object_iterator_t iter;
struct sorted_dependency *sdep, *sdep2;
uint32_t maxprio = 0;
size_t curidx = 0, indirdepscnt = 0, dirdepscnt = 0, cnt = 0;
const char *curpkg, *rundep;
char *pkgname;
int rv = 0;
assert(chaindeps != NULL);
sorted = prop_array_create();
if (sorted == NULL)
return ENOMEM;
/*
* All required deps are satisfied (already installed).
*/
unsorted = prop_dictionary_get(chaindeps, "unsorted_deps");
if (prop_array_count(unsorted) == 0) {
prop_object_release(sorted);
return 0;
}
prop_dictionary_get_uint32(chaindeps, "indirectdeps_count",
&indirdepscnt);
prop_dictionary_get_uint32(chaindeps, "directdeps_count",
&dirdepscnt);
unsorted = prop_dictionary_get(chaindeps, "unsorted_deps");
/*
* Pass 1: order all deps (direct/indirect) by priority.
*/
while (cnt < dirdepscnt + indirdepscnt) {
curidx = find_pkgdict_with_highest_prio(unsorted, &maxprio);
if (curidx == -1) {
rv = errno;
goto out;
}
dict = prop_array_get(unsorted, curidx);
if (dict == NULL) {
rv = errno;
goto out;
}
sdep = calloc(1, sizeof(*sdep));
if (sdep == NULL) {
rv = ENOMEM;
goto out;
}
sdep->dict = prop_dictionary_copy(dict);
sdep->idx = cnt;
prop_dictionary_get_uint32(dict, "priority", &sdep->prio);
reqby = prop_dictionary_get(dict, "required_by");
if (reqby && prop_array_count(reqby) > 0)
sdep->reqby = prop_array_copy(reqby);
SIMPLEQ_INSERT_TAIL(&sdep_list, sdep, chain);
prop_array_remove(unsorted, curidx);
maxprio = 0;
cnt++;
}
/*
* Pass 2: increase priority of dependencies any time
* a package requires them.
*/
SIMPLEQ_FOREACH(sdep, &sdep_list, chain) {
prop_dictionary_get_cstring_nocopy(sdep->dict,
"pkgname", &curpkg);
rundeps_array = prop_dictionary_get(sdep->dict, "run_depends");
if (rundeps_array == NULL)
continue;
iter = prop_array_iterator(rundeps_array);
if (iter == NULL) {
rv = ENOMEM;
goto out;
}
while ((obj = prop_object_iterator_next(iter)) != NULL) {
rundep = prop_string_cstring_nocopy(obj);
pkgname = xbps_get_pkg_name(rundep);
/*
* If package is installed, pass to the next one.
*/
if (xbps_check_is_installed_pkg(rundep) == 0) {
free(pkgname);
continue;
}
/* Ignore itself */
if (strcmp(curpkg, pkgname) == 0) {
free(pkgname);
continue;
}
sdep2 = find_sorteddep_by_name(pkgname);
free(pkgname);
sdep2->prio++;
}
prop_object_iterator_release(iter);
}
prop_dictionary_remove(chaindeps, "unsorted_deps");
/*
* Pass 3: increase priority of a package, by looking at
* its required_by array member's priority.
*/
SIMPLEQ_FOREACH(sdep, &sdep_list, chain) {
iter = prop_array_iterator(sdep->reqby);
if (iter == NULL)
continue;
while ((obj = prop_object_iterator_next(iter))) {
rundep = prop_string_cstring_nocopy(obj);
pkgname = xbps_get_pkg_name(rundep);
sdep2 = find_sorteddep_by_name(pkgname);
if (sdep2 == NULL) {
free(pkgname);
continue;
}
free(pkgname);
sdep->prio += sdep2->prio + 1;
}
prop_object_iterator_release(iter);
}
/*
* Pass 4: copy dictionaries into the final array with the
* correct index position for all dependencies and release
* resources used by the sorting passes.
*/
while ((sdep = find_sorteddep_with_highest_prio()) != NULL) {
prop_array_add(sorted, sdep->dict);
SIMPLEQ_REMOVE(&sdep_list, sdep, sorted_dependency, chain);
prop_object_release(sdep->dict);
prop_object_release(sdep->reqby);
free(sdep);
}
/*
* Sanity check that the array contains the same number of
* objects than the total number of required dependencies.
*/
cnt = dirdepscnt + indirdepscnt;
if (cnt != prop_array_count(sorted)) {
rv = EINVAL;
goto out;
}
if (!prop_dictionary_set(chaindeps, "required_deps", sorted))
rv = EINVAL;
out:
/*
* Release resources used by temporary sorting.
*/
prop_object_release(sorted);
while ((sdep = SIMPLEQ_FIRST(&sdep_list)) != NULL) {
SIMPLEQ_REMOVE(&sdep_list, sdep, sorted_dependency, chain);
prop_object_release(sdep->dict);
prop_object_release(sdep->reqby);
free(sdep);
}
return rv;
}