#include <cstring>
#include <string>
#include <iostream>
+#include <fstream>
#include <system_error>
#include <memory>
#include <algorithm>
#include "service-constants.h"
#include "cpbuffer.h"
#include "dinit-client.h"
+#include "load-service.h"
// dinitctl: utility to control the Dinit daemon, including starting and stopping of services.
static int unload_service(int socknum, cpbuffer_t &, const char *service_name);
static int list_services(int socknum, cpbuffer_t &);
static int shutdown_dinit(int soclknum, cpbuffer_t &);
-static int add_remove_dependency(int socknum, cpbuffer_t &rbuffer, bool add, char *service_from,
- char *service_to, dependency_type dep_type);
-
+static int add_remove_dependency(int socknum, cpbuffer_t &rbuffer, bool add, const char *service_from,
+ const char *service_to, dependency_type dep_type);
+static int enable_service(int socknum, cpbuffer_t &rbuffer, const char *from, const char *to);
static const char * describeState(bool stopped)
{
LIST_SERVICES,
SHUTDOWN,
ADD_DEPENDENCY,
- RM_DEPENDENCY
+ RM_DEPENDENCY,
+ ENABLE_SERVICE,
+ DISABLE_SERVICE
};
using namespace std;
bool show_help = argc < 2;
- char *service_name = nullptr;
- char *to_service_name = nullptr;
+ const char *service_name = nullptr;
+ const char *to_service_name = nullptr;
dependency_type dep_type;
bool dep_type_set = false;
else if (strcmp(argv[i], "--pin") == 0) {
do_pin = true;
}
+ else if ((command == command_t::ENABLE_SERVICE || command == command_t::DISABLE_SERVICE)
+ && strcmp(argv[i], "--from") == 0) {
+ ++i;
+ if (i == argc) {
+ cerr << "dinitctl: --from should be followed by a service name" << std::endl;
+ return 1;
+ }
+ service_name = argv[i];
+ }
else {
cerr << "dinitctl: unrecognized option: " << argv[i] << " (use --help for help)\n";
return 1;
else if (strcmp(argv[i], "rm-dep") == 0) {
command = command_t::RM_DEPENDENCY;
}
+ else if (strcmp(argv[i], "enable") == 0) {
+ command = command_t::ENABLE_SERVICE;
+ }
else {
cerr << "dinitctl: unrecognized command: " << argv[i] << " (use --help for help)\n";
return 1;
break;
}
}
+ else if (command == command_t::ENABLE_SERVICE || command == command_t::DISABLE_SERVICE) {
+ if (to_service_name != nullptr) {
+ show_help = true;
+ break;
+ }
+ to_service_name = argv[i];
+ }
else {
if (service_name != nullptr) {
show_help = true;
return add_remove_dependency(socknum, rbuffer, command == command_t::ADD_DEPENDENCY,
service_name, to_service_name, dep_type);
}
+ else if (command == command_t::ENABLE_SERVICE) {
+ // If only one service specified, assume that we enable for 'boot' service:
+ if (service_name == nullptr) {
+ service_name = "boot";
+ }
+ return enable_service(socknum, rbuffer, service_name, to_service_name);
+ }
else {
return start_stop_service(socknum, rbuffer, service_name, command, do_pin,
wait_for_service, verbose);
return 0;
}
-static int add_remove_dependency(int socknum, cpbuffer_t &rbuffer, bool add, char *service_from,
- char *service_to, dependency_type dep_type)
+static int add_remove_dependency(int socknum, cpbuffer_t &rbuffer, bool add,
+ const char *service_from, const char *service_to, dependency_type dep_type)
{
using namespace std;
return 0;
}
+
+// Join two paths; the 2nd must be relative
+static std::string join_paths(std::string p1, std::string p2)
+{
+ std::string r = p1;
+ if (*(r.rbegin()) != '/') {
+ r += '/';
+ }
+ return r + p2;
+}
+
+// exception for cancelling a service operation
+class service_op_cancel { };
+
+static int enable_service(int socknum, cpbuffer_t &rbuffer, const char *from, const char *to)
+{
+ using namespace std;
+
+ // Load 'from' service:
+ if (issue_load_service(socknum, from)) {
+ return 1;
+ }
+
+ wait_for_reply(rbuffer, socknum);
+
+ service_state_t from_state;
+ handle_t from_handle;
+
+ if (check_load_reply(socknum, rbuffer, &from_handle, &from_state) != 0) {
+ return 1;
+ }
+
+ // Load 'to' service:
+ if (issue_load_service(socknum, to)) {
+ return 1;
+ }
+
+ wait_for_reply(rbuffer, socknum);
+
+ service_state_t to_state;
+ handle_t to_handle;
+
+ if (check_load_reply(socknum, rbuffer, &to_handle, &to_state) != 0) {
+ return 1;
+ }
+
+ // Get service load path
+ char buf[1] = { DINIT_CP_QUERY_LOAD_MECH };
+ write_all_x(socknum, buf, 1);
+
+ wait_for_reply(rbuffer, socknum);
+
+ if (rbuffer[0] != DINIT_RP_LOADER_MECH) {
+ cerr << "dinitctl: Control socket protocol error" << endl;
+ return 1;
+ }
+
+ // Packet type, load mechanism type, packet size:
+ fill_buffer_to(rbuffer, socknum, 2 + sizeof(uint32_t));
+
+ if (rbuffer[1] != SSET_TYPE_DIRLOAD) {
+ cerr << "dinitctl: unknown configuration, unable to load service descriptions" << endl;
+ return 1;
+ }
+
+ vector<string> paths;
+
+ uint32_t pktsize;
+ rbuffer.extract(&pktsize, 2, sizeof(uint32_t));
+
+ fill_buffer_to(rbuffer, socknum, 2 + sizeof(uint32_t) * 3); // path entries, cwd length
+
+ uint32_t path_entries; // number of service directories
+ rbuffer.extract(&path_entries, 2 + sizeof(uint32_t), sizeof(uint32_t));
+
+ uint32_t cwd_len;
+ rbuffer.extract(&cwd_len, 2 + sizeof(uint32_t) * 2, sizeof(uint32_t));
+ rbuffer.consume(2 + sizeof(uint32_t) * 3);
+ pktsize -= 2 + sizeof(uint32_t) * 3;
+
+ // Read current working directory of daemon:
+ std::string dinit_cwd = read_string(socknum, rbuffer, cwd_len);
+
+ // dinit daemon base directory against which service paths are resolved is in dinit_cwd
+
+ for (int i = 0; i < (int)path_entries; i++) {
+ uint32_t plen;
+ fill_buffer_to(rbuffer, socknum, sizeof(uint32_t));
+ rbuffer.extract(&plen, 0, sizeof(uint32_t));
+ rbuffer.consume(sizeof(uint32_t));
+ paths.push_back(read_string(socknum, rbuffer, plen));
+ }
+
+ // all service directories are now in the 'paths' vector
+ // Load/read service description for 'from' service:
+
+ ifstream service_file;
+ string service_file_path;
+
+ for (std::string path : paths) {
+ string test_path = join_paths(dinit_cwd + '/' + path, from);
+
+ service_file.open(test_path.c_str(), ios::in);
+ if (service_file) {
+ service_file_path = test_path;
+ break;
+ }
+ }
+
+ if (! service_file) {
+ cerr << "dinitctl: could not locate service file for service '" << from << "'" << endl;
+ return 1;
+ }
+
+ // We now need to read the service file, identify the waits-for.d directory (bail out if more than one),
+ // make sure the service is not listed as a dependency individually.
+
+ string waits_for_d;
+
+ try {
+ process_service_file(from, service_file, [&](string &line, string &setting,
+ dinit_load::string_iterator i, dinit_load::string_iterator end) -> void {
+ if (setting == "waits-for" || setting == "depends-on" || setting == "depends-ms") {
+ string dname = dinit_load::read_setting_value(i, end);
+ if (dname == to) {
+ // There is already a dependency
+ cerr << "dinitctl: there is a fixed dependency to service '" << to
+ << "' in the service description of '" << from << "'." << endl;
+ throw service_op_cancel();
+ }
+ }
+ else if (setting == "waits-for.d") {
+ string dname = dinit_load::read_setting_value(i, end);
+ if (! waits_for_d.empty()) {
+ cerr << "dinitctl: service '" << from << "' has multiple waits-for.d directories "
+ << "specified in service description" << endl;
+ throw service_op_cancel();
+ }
+ waits_for_d = std::move(dname);
+ }
+ });
+ }
+ catch (const service_op_cancel &cexc) {
+ return 1;
+ }
+
+ // If the from service has no waits-for.d specified, we can't continue
+ if (waits_for_d.empty()) {
+ cerr << "dinitctl: service '" << from << "' has no waits-for.d directory specified" << endl;
+ return 1;
+ }
+
+ // check if dependency already exists
+ string dep_link_path = join_paths(waits_for_d, to);
+ struct stat stat_buf;
+ if (lstat(dep_link_path.c_str(), &stat_buf) == -1) {
+ if (errno != ENOENT) {
+ cerr << "dinitctl: checking for existing dependency link: " << dep_link_path << ": "
+ << strerror(errno) << endl;
+ return 1;
+ }
+ }
+ else {
+ // dependency already exists
+ cerr << "dinitctl: service already enabled." << endl;
+ return 1;
+ }
+
+ // warn if 'from' service is not started
+ if (from_state != service_state_t::STARTED) {
+ cerr << "dinitctl: warning: enabling dependency for non-started service" << endl;
+ }
+
+ // add dependency
+ constexpr int enable_pktsize = 2 + sizeof(handle_t) * 2;
+ char cmdbuf[enable_pktsize] = { char(DINIT_CP_ENABLESERVICE), char(dependency_type::WAITS_FOR)};
+ memcpy(cmdbuf + 2, &from_handle, sizeof(from_handle));
+ memcpy(cmdbuf + 2 + sizeof(from_handle), &to_handle, sizeof(to_handle));
+ write_all_x(socknum, cmdbuf, enable_pktsize);
+
+ wait_for_reply(rbuffer, socknum);
+
+ // check reply
+ if (rbuffer[0] == DINIT_RP_NAK) {
+ cerr << "dinitctl: Could not enable service: possible circular dependency" << endl;
+ return 1;
+ }
+ if (rbuffer[0] != DINIT_RP_ACK) {
+ cerr << "dinitctl: Control socket protocol error" << endl;
+ return 1;
+ }
+
+ // create link
+ if (symlink(dep_link_path.c_str(), (string("../") + to).c_str()) == -1) {
+ cerr << "dinitctl: Could not create symlink at " << dep_link_path << ": " << strerror(errno) << "\n"
+ "dinitctl: Note: service was activated, but will not be enabled on restart." << endl;
+ return 1;
+ }
+
+ return 0;
+}
projects / oweals / dinit.git / commitdiff