pkgconf/libpkgconf/queue.c

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/*
* queue.c
* compilation of a list of packages into a world dependency set
*
* Copyright (c) 2012 pkgconf authors (see AUTHORS).
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* This software is provided 'as is' and without any warranty, express or
* implied. In no event shall the authors be liable for any damages arising
* from the use of this software.
*/
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#include <libpkgconf/libpkgconf.h>
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/*
* !doc
*
* libpkgconf `queue` module
* =========================
*
* The `queue` module provides an interface that allows easily building a dependency graph from an
* arbitrary set of dependencies. It also provides support for doing "preflight" checks on the entire
* dependency graph prior to working with it.
*
* Using the `queue` module functions is the recommended way of working with dependency graphs.
*/
typedef struct {
pkgconf_node_t iter;
char *package;
} pkgconf_queue_t;
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/*
* !doc
*
* .. c:function:: void pkgconf_queue_push(pkgconf_list_t *list, const char *package)
*
* Pushes a requested dependency onto the dependency resolver's queue.
*
* :param pkgconf_list_t* list: the dependency resolution queue to add the package request to.
* :param char* package: the dependency atom requested
* :return: nothing
*/
void
pkgconf_queue_push(pkgconf_list_t *list, const char *package)
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{
pkgconf_queue_t *pkgq = calloc(sizeof(pkgconf_queue_t), 1);
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pkgq->package = strdup(package);
pkgconf_node_insert_tail(&pkgq->iter, pkgq, list);
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}
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/*
* !doc
*
* .. c:function:: bool pkgconf_queue_compile(pkgconf_client_t *client, pkgconf_pkg_t *world, pkgconf_list_t *list)
*
* Compile a dependency resolution queue into a dependency resolution problem if possible, otherwise report an error.
*
* :param pkgconf_client_t* client: The pkgconf client object to use for dependency resolution.
* :param pkgconf_pkg_t* world: The designated root of the dependency graph.
* :param pkgconf_list_t* list: The list of dependency requests to consider.
* :return: true if the built dependency resolution problem is consistent, else false
* :rtype: bool
*/
bool
pkgconf_queue_compile(pkgconf_client_t *client, pkgconf_pkg_t *world, pkgconf_list_t *list)
{
pkgconf_node_t *iter;
PKGCONF_FOREACH_LIST_ENTRY(list->head, iter)
{
pkgconf_queue_t *pkgq;
pkgq = iter->data;
pkgconf_dependency_parse(client, world, &world->requires, pkgq->package);
}
return (world->requires.head != NULL);
}
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/*
* !doc
*
* .. c:function:: void pkgconf_queue_free(pkgconf_list_t *list)
*
* Release any memory related to a dependency resolution queue.
*
* :param pkgconf_list_t* list: The dependency resolution queue to release.
* :return: nothing
*/
void
pkgconf_queue_free(pkgconf_list_t *list)
{
pkgconf_node_t *node, *tnode;
PKGCONF_FOREACH_LIST_ENTRY_SAFE(list->head, tnode, node)
{
pkgconf_queue_t *pkgq = node->data;
free(pkgq->package);
free(pkgq);
}
}
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static inline unsigned int
pkgconf_queue_verify(pkgconf_client_t *client, pkgconf_pkg_t *world, pkgconf_list_t *list, int maxdepth)
{
if (!pkgconf_queue_compile(client, world, list))
return PKGCONF_PKG_ERRF_DEPGRAPH_BREAK;
return pkgconf_pkg_verify_graph(client, world, maxdepth);
}
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/*
* !doc
*
* .. c:function:: void pkgconf_queue_apply(pkgconf_client_t *client, pkgconf_list_t *list, pkgconf_queue_apply_func_t func, int maxdepth, void *data)
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*
* Attempt to compile a dependency resolution queue into a dependency resolution problem, then attempt to solve the problem and
* feed the solution to a callback function if a complete dependency graph is found.
*
* :param pkgconf_client_t* client: The pkgconf client object to use for dependency resolution.
* :param pkgconf_list_t* list: The list of dependency requests to consider.
* :param pkgconf_queue_apply_func_t func: The callback function to call if a solution is found by the dependency resolver.
* :param int maxdepth: The maximum allowed depth for the dependency resolver. A depth of -1 means unlimited.
* :param void* data: An opaque pointer which is passed to the callback function.
* :returns: true if the dependency resolver found a solution, otherwise false.
* :rtype: bool
*/
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bool
pkgconf_queue_apply(pkgconf_client_t *client, pkgconf_list_t *list, pkgconf_queue_apply_func_t func, int maxdepth, void *data)
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{
pkgconf_pkg_t world = {
.id = "virtual:world",
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.realname = "virtual world package",
.flags = PKGCONF_PKG_PROPF_VIRTUAL,
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};
/* if maxdepth is one, then we will not traverse deeper than our virtual package. */
if (!maxdepth)
maxdepth = -1;
if (pkgconf_queue_verify(client, &world, list, maxdepth) != PKGCONF_PKG_ERRF_OK)
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return false;
if (!func(client, &world, data, maxdepth))
{
pkgconf_pkg_free(client, &world);
return false;
}
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pkgconf_pkg_free(client, &world);
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return true;
}
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/*
* !doc
*
* .. c:function:: void pkgconf_queue_validate(pkgconf_client_t *client, pkgconf_list_t *list, pkgconf_queue_apply_func_t func, int maxdepth, void *data)
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*
* Attempt to compile a dependency resolution queue into a dependency resolution problem, then attempt to solve the problem.
*
* :param pkgconf_client_t* client: The pkgconf client object to use for dependency resolution.
* :param pkgconf_list_t* list: The list of dependency requests to consider.
* :param int maxdepth: The maximum allowed depth for the dependency resolver. A depth of -1 means unlimited.
* :returns: true if the dependency resolver found a solution, otherwise false.
* :rtype: bool
*/
bool
pkgconf_queue_validate(pkgconf_client_t *client, pkgconf_list_t *list, int maxdepth)
{
bool retval = true;
pkgconf_pkg_t world = {
.id = "virtual:world",
.realname = "virtual world package",
.flags = PKGCONF_PKG_PROPF_VIRTUAL,
};
/* if maxdepth is one, then we will not traverse deeper than our virtual package. */
if (!maxdepth)
maxdepth = -1;
if (pkgconf_queue_verify(client, &world, list, maxdepth) != PKGCONF_PKG_ERRF_OK)
retval = false;
pkgconf_pkg_free(client, &world);
return retval;
}