X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Flogin%2Flogind-machine.c;fp=src%2Flogin%2Flogind-machine.c;h=347e5aa022615d42203cd15d9d40adafcbee282e;hp=0000000000000000000000000000000000000000;hb=9444b1f20e311f073864d81e913bd4f32fe95cfd;hpb=77f40f165cc60a1d6b8a3503e4b7e46814d5935e

diff --git a/src/login/logind-machine.c b/src/login/logind-machine.c
new file mode 100644
index 000000000..347e5aa02
--- /dev/null
+++ b/src/login/logind-machine.c
@@ -0,0 +1,455 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2011 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "logind-machine.h"
+#include "util.h"
+#include "mkdir.h"
+#include "cgroup-util.h"
+#include "hashmap.h"
+#include "strv.h"
+#include "fileio.h"
+#include "special.h"
+#include <systemd/sd-messages.h>
+
+Machine* machine_new(Manager *manager, const char *name) {
+        Machine *m;
+
+        assert(manager);
+        assert(name);
+
+        m = new0(Machine, 1);
+        if (!m)
+                return NULL;
+
+        m->name = strdup(name);
+        if (!m->name)
+                goto fail;
+
+        m->state_file = strappend("/run/systemd/machines/", m->name);
+        if (!m->state_file)
+                goto fail;
+
+        if (hashmap_put(manager->machines, m->name, m) < 0)
+                goto fail;
+
+        m->class = _MACHINE_CLASS_INVALID;
+        m->manager = manager;
+
+        return m;
+
+fail:
+        free(m->state_file);
+        free(m->name);
+        free(m);
+
+        return NULL;
+}
+
+void machine_free(Machine *m) {
+        assert(m);
+
+        if (m->in_gc_queue)
+                LIST_REMOVE(Machine, gc_queue, m->manager->machine_gc_queue, m);
+
+        if (m->cgroup_path) {
+                hashmap_remove(m->manager->machine_cgroups, m->cgroup_path);
+                free(m->cgroup_path);
+        }
+
+        hashmap_remove(m->manager->machines, m->name);
+
+        free(m->name);
+        free(m->state_file);
+        free(m->service);
+        free(m->slice);
+        free(m->root_directory);
+        free(m);
+}
+
+int machine_save(Machine *m) {
+        _cleanup_free_ char *temp_path = NULL;
+        _cleanup_fclose_ FILE *f = NULL;
+        int r;
+
+        assert(m);
+        assert(m->state_file);
+
+        if (!m->started)
+                return 0;
+
+        r = mkdir_safe_label("/run/systemd/machines", 0755, 0, 0);
+        if (r < 0)
+                goto finish;
+
+        r = fopen_temporary(m->state_file, &f, &temp_path);
+        if (r < 0)
+                goto finish;
+
+        fchmod(fileno(f), 0644);
+
+        fprintf(f,
+                "# This is private data. Do not parse.\n"
+                "NAME=%s\n",
+                m->name);
+
+        if (m->cgroup_path)
+                fprintf(f, "CGROUP=%s\n", m->cgroup_path);
+
+        if (m->service)
+                fprintf(f, "SERVICE=%s\n", m->service);
+
+        if (m->slice)
+                fprintf(f, "SLICE=%s\n", m->slice);
+
+        if (m->root_directory)
+                fprintf(f, "ROOT=%s\n", m->root_directory);
+
+        if (!sd_id128_equal(m->id, SD_ID128_NULL))
+                fprintf(f, "ID=" SD_ID128_FORMAT_STR "\n", SD_ID128_FORMAT_VAL(m->id));
+
+        if (m->leader != 0)
+                fprintf(f, "LEADER=%lu\n", (unsigned long) m->leader);
+
+        if (m->class != _MACHINE_CLASS_INVALID)
+                fprintf(f, "CLASS=%s\n", machine_class_to_string(m->class));
+
+        if (dual_timestamp_is_set(&m->timestamp))
+                fprintf(f,
+                        "REALTIME=%llu\n"
+                        "MONOTONIC=%llu\n",
+                        (unsigned long long) m->timestamp.realtime,
+                        (unsigned long long) m->timestamp.monotonic);
+
+        fflush(f);
+
+        if (ferror(f) || rename(temp_path, m->state_file) < 0) {
+                r = -errno;
+                unlink(m->state_file);
+                unlink(temp_path);
+        }
+
+finish:
+        if (r < 0)
+                log_error("Failed to save machine data for %s: %s", m->name, strerror(-r));
+
+        return r;
+}
+
+int machine_load(Machine *m) {
+        _cleanup_free_ char *realtime = NULL, *monotonic = NULL, *id = NULL, *leader = NULL, *class = NULL;
+        int r;
+
+        assert(m);
+
+        r = parse_env_file(m->state_file, NEWLINE,
+                           "CGROUP",    &m->cgroup_path,
+                           "SERVICE",   &m->service,
+                           "SLICE",     &m->slice,
+                           "ROOT",      &m->root_directory,
+                           "ID",        &id,
+                           "LEADER",    &leader,
+                           "CLASS",     &class,
+                           "REALTIME",  &realtime,
+                           "MONOTONIC", &monotonic,
+                           NULL);
+        if (r < 0) {
+                if (r == -ENOENT)
+                        return 0;
+
+                log_error("Failed to read %s: %s", m->state_file, strerror(-r));
+                return r;
+        }
+
+        if (id)
+                sd_id128_from_string(id, &m->id);
+
+        if (leader)
+                parse_pid(leader, &m->leader);
+
+        if (class) {
+                MachineClass c;
+
+                c = machine_class_from_string(class);
+                if (c >= 0)
+                        m->class = c;
+        }
+
+        if (realtime) {
+                unsigned long long l;
+                if (sscanf(realtime, "%llu", &l) > 0)
+                        m->timestamp.realtime = l;
+        }
+
+        if (monotonic) {
+                unsigned long long l;
+                if (sscanf(monotonic, "%llu", &l) > 0)
+                        m->timestamp.monotonic = l;
+        }
+
+        return r;
+}
+
+static int machine_create_one_group(Machine *m, const char *controller, const char *path) {
+        int r;
+
+        assert(m);
+        assert(path);
+
+        if (m->leader > 0)
+                r = cg_create_and_attach(controller, path, m->leader);
+        else
+                r = -EINVAL;
+
+        if (r < 0) {
+                r = cg_create(controller, path, NULL);
+                if (r < 0)
+                        return r;
+        }
+
+        return 0;
+}
+
+static int machine_create_cgroup(Machine *m) {
+        char **k;
+        int r;
+
+        assert(m);
+
+        if (!m->slice) {
+                m->slice = strdup(SPECIAL_MACHINE_SLICE);
+                if (!m->slice)
+                        return log_oom();
+        }
+
+        if (!m->cgroup_path) {
+                _cleanup_free_ char *escaped = NULL, *slice = NULL;
+                char *name;
+
+                name = strappenda(m->name, ".machine");
+
+                escaped = cg_escape(name);
+                if (!escaped)
+                        return log_oom();
+
+                r = cg_slice_to_path(m->slice, &slice);
+                if (r < 0)
+                        return r;
+
+                m->cgroup_path = strjoin(m->manager->cgroup_root, "/", slice, "/", escaped, NULL);
+                if (!m->cgroup_path)
+                        return log_oom();
+        }
+
+        r = machine_create_one_group(m, SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path);
+        if (r < 0) {
+                log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", m->cgroup_path, strerror(-r));
+                return r;
+        }
+
+        STRV_FOREACH(k, m->manager->controllers) {
+
+                if (strv_contains(m->manager->reset_controllers, *k))
+                        continue;
+
+                r = machine_create_one_group(m, *k, m->cgroup_path);
+                if (r < 0)
+                        log_warning("Failed to create cgroup %s:%s: %s", *k, m->cgroup_path, strerror(-r));
+        }
+
+        if (m->leader > 0) {
+                STRV_FOREACH(k, m->manager->reset_controllers) {
+                        r = cg_attach(*k, "/", m->leader);
+                        if (r < 0)
+                                log_warning("Failed to reset controller %s: %s", *k, strerror(-r));
+                }
+        }
+
+        r = hashmap_put(m->manager->machine_cgroups, m->cgroup_path, m);
+        if (r < 0)
+                log_warning("Failed to create mapping between cgroup and machine");
+
+        return 0;
+}
+
+int machine_start(Machine *m) {
+        int r;
+
+        assert(m);
+
+        if (m->started)
+                return 0;
+
+        log_struct(LOG_INFO,
+                   MESSAGE_ID(SD_MESSAGE_MACHINE_START),
+                   "NAME=%s", m->name,
+                   "LEADER=%lu", (unsigned long) m->leader,
+                   "MESSAGE=New machine %s.", m->name,
+                   NULL);
+
+        /* Create cgroup */
+        r = machine_create_cgroup(m);
+        if (r < 0)
+                return r;
+
+        if (!dual_timestamp_is_set(&m->timestamp))
+                dual_timestamp_get(&m->timestamp);
+
+        m->started = true;
+
+        /* Save new machine data */
+        machine_save(m);
+
+        machine_send_signal(m, true);
+
+        return 0;
+}
+
+static int machine_terminate_cgroup(Machine *m) {
+        int r;
+        char **k;
+
+        assert(m);
+
+        if (!m->cgroup_path)
+                return 0;
+
+        cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, false);
+
+        r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, true);
+        if (r < 0)
+                log_error("Failed to kill machine cgroup: %s", strerror(-r));
+
+        STRV_FOREACH(k, m->manager->controllers)
+                cg_trim(*k, m->cgroup_path, true);
+
+        hashmap_remove(m->manager->machine_cgroups, m->cgroup_path);
+
+        free(m->cgroup_path);
+        m->cgroup_path = NULL;
+
+        return r;
+}
+
+int machine_stop(Machine *m) {
+        int r = 0, k;
+        assert(m);
+
+        if (m->started)
+                log_struct(LOG_INFO,
+                           MESSAGE_ID(SD_MESSAGE_MACHINE_STOP),
+                           "NAME=%s", m->name,
+                           "LEADER=%lu", (unsigned long) m->leader,
+                           "MESSAGE=Machine %s terminated.", m->name,
+                           NULL);
+
+        /* Kill cgroup */
+        k = machine_terminate_cgroup(m);
+        if (k < 0)
+                r = k;
+
+        unlink(m->state_file);
+        machine_add_to_gc_queue(m);
+
+        if (m->started)
+                machine_send_signal(m, false);
+
+        m->started = false;
+
+        return r;
+}
+
+int machine_check_gc(Machine *m, bool drop_not_started) {
+        int r;
+
+        assert(m);
+
+        if (drop_not_started && !m->started)
+                return 0;
+
+        if (m->cgroup_path) {
+                r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, false);
+                if (r < 0)
+                        return r;
+
+                if (r <= 0)
+                        return 1;
+        }
+
+        return 0;
+}
+
+void machine_add_to_gc_queue(Machine *m) {
+        assert(m);
+
+        if (m->in_gc_queue)
+                return;
+
+        LIST_PREPEND(Machine, gc_queue, m->manager->machine_gc_queue, m);
+        m->in_gc_queue = true;
+}
+
+int machine_kill(Machine *m, KillWho who, int signo) {
+        _cleanup_set_free_ Set *pid_set = NULL;
+        int r = 0;
+
+        assert(m);
+
+        if (!m->cgroup_path)
+                return -ESRCH;
+
+        if (m->leader <= 0 && who == KILL_LEADER)
+                return -ESRCH;
+
+        if (m->leader > 0)
+                if (kill(m->leader, signo) < 0)
+                        r = -errno;
+
+        if (who == KILL_ALL) {
+                int q;
+
+                pid_set = set_new(trivial_hash_func, trivial_compare_func);
+                if (!pid_set)
+                        return log_oom();
+
+                if (m->leader > 0) {
+                        q = set_put(pid_set, LONG_TO_PTR(m->leader));
+                        if (q < 0)
+                                r = q;
+                }
+
+                q = cg_kill_recursive(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_path, signo, false, true, false, pid_set);
+                if (q < 0 && (q != -EAGAIN && q != -ESRCH && q != -ENOENT))
+                        r = q;
+        }
+
+        return r;
+}
+
+static const char* const machine_class_table[_MACHINE_CLASS_MAX] = {
+        [MACHINE_CONTAINER] = "container",
+        [MACHINE_VM] = "vm"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(machine_class, MachineClass);