diff options
Diffstat (limited to 'src/core/depend.c')
| -rw-r--r-- | src/core/depend.c | 557 |
1 files changed, 0 insertions, 557 deletions
diff --git a/src/core/depend.c b/src/core/depend.c index 4946326..e69de29 100644 --- a/src/core/depend.c +++ b/src/core/depend.c @@ -1,557 +0,0 @@ -/* - * depend.c - * - * Dependancy engine for Gentoo style rc-scripts. - * - * Copyright (C) 2004,2005 Martin Schlemmer <azarah@nosferatu.za.org> - * - * - * This program is free software; you can redistribute it and/or modify it - * under the terms of the GNU General Public License as published by the - * Free Software Foundation version 2 of the License. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * You should have received a copy of the GNU General Public License along - * with this program; if not, write to the Free Software Foundation, Inc., - * 675 Mass Ave, Cambridge, MA 02139, USA. - * - * $Header$ - */ - -#include <errno.h> -#include <string.h> -#include <stddef.h> -#include <stdio.h> -#include <stdlib.h> - -#include "debug.h" -#include "depend.h" -#include "list.h" -#include "misc.h" - -LIST_HEAD(service_info_list); - -/* Names for service types (service_type_t) in depend.h. - * Note that this should sync with service_type_t */ -char *service_type_names[] = { - "NEED", - "NEED_ME", - "USE", - "USE_ME", - "BEFORE", - "AFTER", - "BROKEN", - "PROVIDE", - NULL -}; - -int __service_resolve_dependency(char *servicename, char *dependency, service_type_t type); - -service_info_t *service_get_info(char *servicename) -{ - service_info_t *info; - - if ((NULL == servicename) || (0 == strlen(servicename))) { - DBG_MSG("Invalid argument passed!\n"); - return NULL; - } - - list_for_each_entry(info, &service_info_list, node) { - if (NULL != info->name) - if (0 == strcmp(info->name, servicename)) - return info; - } - - /* We use this to check if a service exists, so rather do not - * add debugging, otherwise it is very noisy! */ - /* DBG_MSG("Invalid service name '%s'!\n", servicename); */ - - return NULL; -} - -int service_add(char *servicename) -{ - service_info_t *info; - service_info_t *sorted; - int count; - - if ((NULL == servicename) || (0 == strlen(servicename))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - info = service_get_info(servicename); - if (NULL == info) { - DBG_MSG("Adding service '%s'.\n", servicename); - - info = malloc(sizeof(service_info_t)); - if (NULL == info) { - DBG_MSG("Failed to allocate service_info_t!\n"); - return -1; - } - - info->name = strndup(servicename, strlen(servicename)); - if (NULL == info->name) { - DBG_MSG("Failed to allocate buffer!\n"); - free(info); - return -1; - } - - for (count = 0; count < ALL_SERVICE_TYPE_T; count++) - info->depend_info[count] = NULL; - info->provide = NULL; - - /* We want to keep the list sorted */ - list_for_each_entry(sorted, &service_info_list, node) { - if (strcmp(sorted->name, servicename) > 0) { - break; - } - } - - list_add_tail(&info->node, &sorted->node); - - return 0; - } else { - DBG_MSG("Tried to add duplicate service '%s'!\n", servicename); - } - - return -1; -} - -int service_is_dependency(char *servicename, char *dependency, service_type_t type) -{ - service_info_t *info; - char *service; - int count = 0; - - if ((NULL == servicename) - || (0 == strlen(servicename)) - || (NULL == dependency) - || (0 == strlen(dependency))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - info = service_get_info(servicename); - if (NULL != info) { - STRING_LIST_FOR_EACH(info->depend_info[type], service, count) { - if (0 == strcmp(dependency, service)) - return 0; - } - } else { - DBG_MSG("Invalid service name '%s'!\n", servicename); - } - - return -1; -} - -int service_add_dependency(char *servicename, char *dependency, service_type_t type) -{ - service_info_t *info; - char *tmp_buf; - - if ((NULL == servicename) - || (0 == strlen(servicename)) - || (NULL == dependency) - || (0 == strlen(dependency))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - info = service_get_info(servicename); - if (NULL != info) { - /* Do not add duplicates */ - if (-1 == service_is_dependency(servicename, dependency, type)) { - DBG_MSG("Adding dependency '%s' of service '%s', type '%s'.\n", - dependency, servicename, service_type_names[type]); - - tmp_buf = strndup(dependency, strlen(dependency)); - if (NULL == tmp_buf) { - DBG_MSG("Failed to allocate buffer!\n"); - return -1; - } - - STRING_LIST_ADD_SORT(info->depend_info[type], tmp_buf, error); - } else { - DBG_MSG("Duplicate dependency '%s' for service '%s', type '%s'!\n", - dependency, servicename, service_type_names[type]); - /* Rather do not fail here, as we add a lot of doubles - * during resolving of dependencies */ - } - - return 0; - } else { - DBG_MSG("Invalid service name '%s'!\n", servicename); - } - -error: - return -1; -} - -int service_del_dependency(char *servicename, char *dependency, service_type_t type) -{ - service_info_t *info; - - if ((NULL == servicename) - || (0 == strlen(servicename)) - || (NULL == dependency) - || (0 == strlen(dependency))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - if (-1 == service_is_dependency(servicename, dependency, type)) { - DBG_MSG("Tried to remove invalid dependency '%s'!\n", dependency); - return -1; - } - - info = service_get_info(servicename); - if (NULL != info) { - DBG_MSG("Removing dependency '%s' of service '%s', type '%s'.\n", - dependency , servicename, service_type_names[type]); - - STRING_LIST_DEL(info->depend_info[type], dependency, error); - return 0; - } else { - DBG_MSG("Invalid service name '%s'!\n", servicename); - } - -error: - return -1; -} - -service_info_t *service_get_virtual(char *virtual) -{ - service_info_t *info; - - if ((NULL == virtual) || (0 == strlen(virtual))) { - DBG_MSG("Invalid argument passed!\n"); - return NULL; - } - - list_for_each_entry(info, &service_info_list, node) { - if (NULL != info->provide) - if (0 == strcmp(info->provide, virtual)) - return info; - } - - /* We use this to check if a virtual exists, so rather do not - * add debugging, otherwise it is very noisy! */ - /* DBG_MSG("Invalid service name '%s'!\n", virtual); */ - - return NULL; -} - -int service_add_virtual(char *servicename, char* virtual) -{ - service_info_t *info; - - if ((NULL == servicename) - || (0 == strlen(servicename)) - || (NULL == virtual ) - || (0 == strlen(virtual))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - if (NULL != service_get_info(virtual)) { - EERROR(" Cannot add provide '%s', as a service with the same name exists!\n", - virtual); - /* Do not fail here as we do have a service that resolves - * the virtual */ - } - - info = service_get_virtual(virtual); - if (NULL != info) { - /* We cannot have more than one service Providing a virtual */ - EWARN(" Service '%s' already provides '%s'!;\n", - info->name, virtual); - EWARN(" Not adding service '%s'...\n", servicename); - /* Do not fail here as we do have a service that resolves - * the virtual */ - } else { - info = service_get_info(servicename); - if (NULL != info) { - DBG_MSG("Adding virtual '%s' of service '%s'.\n", - virtual, servicename); - - info->provide = strndup(virtual, strlen(virtual)); - if (NULL == info->provide) { - DBG_MSG("Failed to allocate buffer!\n"); - return -1; - } - } else { - DBG_MSG("Invalid service name '%s'!\n", servicename); - return -1; - } - } - - return 0; -} - -int service_set_mtime(char *servicename, time_t mtime) -{ - service_info_t *info; - - if ((NULL == servicename) || (0 == strlen(servicename))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - info = service_get_info(servicename); - if (NULL != info) { - DBG_MSG("Setting mtime '%li' of service '%s'.\n", - mtime, servicename); - - info->mtime = mtime; - - return 0; - } else { - DBG_MSG("Invalid service name '%s'!\n", servicename); - } - - return -1; -} - -int __service_resolve_dependency(char *servicename, char *dependency, service_type_t type) -{ - service_info_t *info; - int retval; - - if ((NULL == servicename) - || (0 == strlen(servicename)) - || (NULL == dependency) - || (0 == strlen(dependency))) { - DBG_MSG("Invalid argument passed!\n"); - return -1; - } - - info = service_get_info(servicename); - if (NULL == info) { - DBG_MSG("Invalid service name passed!\n"); - return -1; - } - - DBG_MSG("Checking dependency '%s' of service '%s', type '%s'.\n", - dependency, servicename, service_type_names[type]); - - /* If there are no existing service 'dependency', try to resolve - * possible virtual services */ - info = service_get_info(dependency); - if (NULL == info) { - info = service_get_virtual(dependency); - if (NULL != info) { - DBG_MSG("Virtual '%s' -> '%s' for service '%s', type '%s'.\n", - dependency, info->name, servicename, - service_type_names[type]); - - retval = service_del_dependency(servicename, dependency, type); - if (-1 == retval) { - DBG_MSG("Failed to delete dependency!\n"); - return -1; - } - - /* Add the actual service name for the virtual */ - dependency = info->name; - retval = service_add_dependency(servicename, dependency, type); - if (-1 == retval) { - DBG_MSG("Failed to add dependency!\n"); - return -1; - } - } - } - - /* Handle 'need', as it is the only dependency type that should - * handle invalid database entries currently. */ - if (NULL == info) { - if ((type == NEED) || (type == NEED_ME)) { - EWARN(" Can't find service '%s' needed by '%s'; continuing...\n", - dependency, servicename); - - retval = service_add_dependency(servicename, dependency, BROKEN); - if (-1 == retval) { - DBG_MSG("Failed to add dependency!\n"); - return -1; - } - - /* Delete invalid entry */ - goto remove; - } - - /* For the rest, if the dependency is not 'net', just silently - * die without error. Should not be needed as we add a 'net' - * service manually before we start, but you never know ... */ - if (0 != strcmp(dependency, "net")) { - /* Delete invalid entry */ - goto remove; - } - } - - /* Ugly bug ... if a service depends on itself, it creates a - * 'mini fork bomb' effect, and breaks things horribly ... */ - if (0 == strcmp(servicename, dependency)) { - /* Dont work too well with the '*' before and after */ - if ((type != BEFORE) && (type != AFTER)) - EWARN(" Service '%s' can't depend on itself; continuing...\n", - servicename); - - /* Delete invalid entry */ - goto remove; - } - - /* Currently only these depend/order types are supported */ - if ((type == NEED) - || (type == USE) - || (type == BEFORE) - || (type == AFTER)) { - if (type == BEFORE) { - /* NEED and USE override BEFORE - * ('servicename' BEFORE 'dependency') */ - if ((0 == service_is_dependency(servicename, dependency, NEED)) - || (0 == service_is_dependency(servicename, dependency, USE))) { - /* Delete invalid entry */ - goto remove; - } - } - - if (type == AFTER) { - /* NEED and USE override AFTER - * ('servicename' AFTER 'dependency') */ - if ((0 == service_is_dependency(dependency, servicename, NEED)) - || (0 == service_is_dependency(dependency, servicename, USE))) { - /* Delete invalid entry */ - goto remove; - } - } - - /* We do not want to add circular dependencies ... */ - if (0 == service_is_dependency(dependency, servicename, type)) { - EWARN(" Services '%s' and '%s' have circular\n", - servicename, dependency); - EWARN(" dependency of type '%s'; continuing...\n", - service_type_names[type]); - - /* For now remove this dependency */ - goto remove; - } - - /* Reverse mapping */ - if (type == NEED) { - retval = service_add_dependency(dependency, servicename, NEED_ME); - if (-1 == retval) { - DBG_MSG("Failed to add dependency!\n"); - return -1; - } - } - - /* Reverse mapping */ - if (type == USE) { - retval = service_add_dependency(dependency, servicename, USE_ME); - if (-1 == retval) { - DBG_MSG("Failed to add dependency!\n"); - return -1; - } - } - - /* Reverse mapping */ - if (type == BEFORE) { - retval = service_add_dependency(dependency, servicename, AFTER); - if (-1 == retval) { - DBG_MSG("Failed to add dependency!\n"); - return -1; - } - } - - /* Reverse mapping */ - if (type == AFTER) { - retval = service_add_dependency(dependency, servicename, BEFORE); - if (-1 == retval) { - DBG_MSG("Failed to add dependency!\n"); - return -1; - } - } - } - - return 0; - -remove: - /* Delete invalid entry */ - DBG_MSG("Removing invalid dependency '%s' of service '%s', type '%s'.\n", - dependency, servicename, service_type_names[type]); - - retval = service_del_dependency(servicename, dependency, type); - if (-1 == retval) { - DBG_MSG("Failed to delete dependency!\n"); - return -1; - } - - /* Here we should not die with error */ - return 0; -} - -int service_resolve_dependencies(void) -{ - service_info_t *info; - char *service; - char *next = NULL; - int count; - - /* Add our 'net' service */ - if (NULL == service_get_info("net")) { - if (-1 == service_add("net")) { - DBG_MSG("Failed to add virtual!\n"); - return -1; - } - service_set_mtime("net", 0); - } - - /* Calculate all virtuals */ - list_for_each_entry(info, &service_info_list, node) { - STRING_LIST_FOR_EACH_SAFE(info->depend_info[PROVIDE], service, next, count) - if (-1 == service_add_virtual(info->name, service)) { - DBG_MSG("Failed to add virtual!\n"); - return -1; - } - } - - /* Now do NEED, USE, BEFORE and AFTER */ - list_for_each_entry(info, &service_info_list, node) { - STRING_LIST_FOR_EACH_SAFE(info->depend_info[NEED], service, next, count) { - if (-1 == __service_resolve_dependency(info->name, service, NEED)) { - DBG_MSG("Failed to resolve dependency!\n"); - return -1; - } - } - } - list_for_each_entry(info, &service_info_list, node) { - STRING_LIST_FOR_EACH_SAFE(info->depend_info[USE], service, next, count) { - if (-1 == __service_resolve_dependency(info->name, service, USE)) { - DBG_MSG("Failed to resolve dependency!\n"); - return -1; - } - } - } - list_for_each_entry(info, &service_info_list, node) { - STRING_LIST_FOR_EACH_SAFE(info->depend_info[BEFORE], service, next, count) { - if (-1 == __service_resolve_dependency(info->name, service, BEFORE)) { - DBG_MSG("Failed to resolve dependency!\n"); - return -1; - } - } - } - list_for_each_entry(info, &service_info_list, node) { - STRING_LIST_FOR_EACH_SAFE(info->depend_info[AFTER], service, next, count) { - if (-1 == __service_resolve_dependency(info->name, service, AFTER)) { - DBG_MSG("Failed to resolve dependency!\n"); - return -1; - } - } - } - - return 0; -} - |