logind: first version that compiles fine

1 files changed, 420 insertions, 0 deletions

diff --git a/src/logind-user.c b/src/logind-user.c
new file mode 100644
index 0000000000..1292eed3e2
--- /dev/null
+++ b/src/logind-user.c
@@ -0,0 +1,420 @@
+/*-*- 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 General Public License as published by
+  the Free Software Foundation; either version 2 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
+  General Public License for more details.
+
+  You should have received a copy of the GNU 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.h"
+#include "util.h"
+#include "cgroup-util.h"
+#include "hashmap.h"
+#include "strv.h"
+
+User* user_new(Manager *m, uid_t uid, gid_t gid, const char *name) {
+        User *u;
+
+        assert(m);
+        assert(name);
+
+        u = new(User, 1);
+        if (!u)
+                return NULL;
+
+        u->name = strdup(name);
+        if (!u->name) {
+                free(u);
+                return NULL;
+        }
+
+        if (asprintf(&u->state_file, "/run/systemd/user/%lu", (unsigned long) uid) < 0) {
+                free(u->name);
+                free(u);
+                return NULL;
+        }
+
+        if (hashmap_put(m->users, ULONG_TO_PTR((unsigned long) uid), u) < 0) {
+                free(u->state_file);
+                free(u->name);
+                free(u);
+                return NULL;
+        }
+
+        u->manager = m;
+        u->uid = uid;
+        u->gid = gid;
+
+        return u;
+}
+
+void user_free(User *u) {
+        assert(u);
+
+        while (u->sessions)
+                session_free(u->sessions);
+
+        free(u->cgroup_path);
+
+        free(u->service);
+        free(u->runtime_path);
+
+        hashmap_remove(u->manager->users, ULONG_TO_PTR((unsigned long) u->uid));
+
+        free(u->name);
+        free(u->state_file);
+        free(u);
+}
+
+int user_save(User *u) {
+        FILE *f;
+        int r;
+
+        assert(u);
+        assert(u->state_file);
+
+        r = safe_mkdir("/run/systemd/user", 0755, 0, 0);
+        if (r < 0)
+                return r;
+
+        f = fopen(u->state_file, "we");
+        if (!f)
+                return -errno;
+
+        fprintf(f,
+                "NAME=%s\n"
+                "STATE=%s\n",
+                u->name,
+                user_state_to_string(user_get_state(u)));
+
+        if (u->cgroup_path)
+                fprintf(f,
+                        "CGROUP=%s\n",
+                        u->cgroup_path);
+
+        if (u->runtime_path)
+                fprintf(f,
+                        "RUNTIME=%s\n",
+                        u->runtime_path);
+
+        if (u->service)
+                fprintf(f,
+                        "SERVICE=%s\n",
+                        u->service);
+
+        if (u->display)
+                fprintf(f,
+                        "DISPLAY=%s\n",
+                        u->display->id);
+
+        fflush(f);
+        if (ferror(f)) {
+                r = -errno;
+                unlink(u->state_file);
+        }
+
+        fclose(f);
+        return r;
+}
+
+int user_load(User *u) {
+        int r;
+        char *display = NULL;
+        Session *s;
+
+        assert(u);
+
+        r = parse_env_file(u->state_file, "r",
+                           "CGROUP", &u->cgroup_path,
+                           "RUNTIME", &u->runtime_path,
+                           "SERVICE", &u->service,
+                           "DISPLAY", &display,
+                           NULL);
+        if (r < 0) {
+                free(display);
+
+                if (r == -ENOENT)
+                        return 0;
+
+                log_error("Failed to read %s: %s", u->state_file, strerror(-r));
+                return r;
+        }
+
+        s = hashmap_get(u->manager->sessions, display);
+        free(display);
+
+        if (s && s->display && x11_display_is_local(s->display))
+                u->display = s;
+
+        return r;
+}
+
+static int user_mkdir_runtime_path(User *u) {
+        char *p;
+        int r;
+
+        assert(u);
+
+        r = safe_mkdir("/run/user", 0755, 0, 0);
+        if (r < 0) {
+                log_error("Failed to create /run/user: %s", strerror(-r));
+                return r;
+        }
+
+        if (!u->runtime_path) {
+                p = strappend("/run/user/", u->name);
+
+                if (!p) {
+                        log_error("Out of memory");
+                        return -ENOMEM;
+                }
+        } else
+                p = u->runtime_path;
+
+        r = safe_mkdir(p, 0700, u->uid, u->gid);
+        if (r < 0) {
+                log_error("Failed to create runtime directory %s: %s", p, strerror(-r));
+                free(p);
+                u->runtime_path = NULL;
+                return r;
+        }
+
+        u->runtime_path = p;
+        return 0;
+}
+
+static int user_create_cgroup(User *u) {
+        char **k;
+        char *p;
+        int r;
+
+        assert(u);
+
+        if (!u->cgroup_path) {
+                if (asprintf(&p, "%s/%s", u->manager->cgroup_path, u->name) < 0) {
+                        log_error("Out of memory");
+                        return -ENOMEM;
+                }
+        } else
+                p = u->cgroup_path;
+
+        r = cg_create(SYSTEMD_CGROUP_CONTROLLER, p);
+        if (r < 0) {
+                free(p);
+                u->cgroup_path = NULL;
+                log_error("Failed to create cgroup "SYSTEMD_CGROUP_CONTROLLER":%s: %s", p, strerror(-r));
+                return r;
+        }
+
+        u->cgroup_path = p;
+
+        STRV_FOREACH(k, u->manager->controllers) {
+                r = cg_create(*k, p);
+                if (r < 0)
+                        log_warning("Failed to create cgroup %s:%s: %s", *k, p, strerror(-r));
+        }
+
+        return 0;
+}
+
+static int user_start_service(User *u) {
+        assert(u);
+
+        return 0;
+}
+
+int user_start(User *u) {
+        int r;
+
+        assert(u);
+
+        /* Make XDG_RUNTIME_DIR */
+        r = user_mkdir_runtime_path(u);
+        if (r < 0)
+                return r;
+
+        /* Create cgroup */
+        r = user_create_cgroup(u);
+        if (r < 0)
+                return r;
+
+        /* Spawn user systemd */
+        r = user_start_service(u);
+        if (r < 0)
+                return r;
+
+        dual_timestamp_get(&u->timestamp);
+
+        return 0;
+}
+
+static int user_stop_service(User *u) {
+        assert(u);
+
+        if (!u->service)
+                return 0;
+
+        return 0;
+}
+
+static int user_shall_kill(User *u) {
+        assert(u);
+
+        return u->manager->kill_user_processes;
+}
+
+static int user_kill_cgroup(User *u) {
+        int r;
+        char **k;
+
+        assert(u);
+
+        if (!u->cgroup_path)
+                return 0;
+
+        cg_trim(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
+
+        if (user_shall_kill(u)) {
+
+                r = cg_kill_recursive_and_wait(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
+                if (r < 0)
+                        log_error("Failed to kill user cgroup: %s", strerror(-r));
+        } else {
+
+                r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, true);
+                if (r < 0)
+                        log_error("Failed to check user cgroup: %s", strerror(-r));
+                else if (r > 0) {
+                        r = cg_delete(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
+                        if (r < 0)
+                                log_error("Failed to delete user cgroup: %s", strerror(-r));
+                } else
+                        r = -EBUSY;
+        }
+
+        STRV_FOREACH(k, u->manager->controllers)
+                cg_trim(*k, u->cgroup_path, true);
+
+        free(u->cgroup_path);
+        u->cgroup_path = NULL;
+
+        return r;
+}
+
+static int user_remove_runtime_path(User *u) {
+        int r;
+
+        assert(u);
+
+        if (!u->runtime_path)
+                return 0;
+
+        r = rm_rf(u->runtime_path, false, true);
+        if (r < 0)
+                log_error("Failed to remove runtime directory %s: %s", u->runtime_path, strerror(-r));
+
+        free(u->runtime_path);
+        u->runtime_path = NULL;
+
+        return r;
+}
+
+int user_stop(User *u) {
+        Session *s;
+        int r = 0, k;
+        assert(u);
+
+        LIST_FOREACH(sessions_by_user, s, u->sessions) {
+                k = session_stop(s);
+                if (k < 0)
+                        r = k;
+        }
+
+        /* Kill systemd */
+        k = user_stop_service(u);
+        if (k < 0)
+                r = k;
+
+        /* Kill cgroup */
+        k = user_kill_cgroup(u);
+        if (k < 0)
+                r = k;
+
+        /* Kill XDG_RUNTIME_DIR */
+        k = user_remove_runtime_path(u);
+        if (k < 0)
+                r = k;
+
+        return r;
+}
+
+int user_check_gc(User *u) {
+        int r;
+        char *p;
+
+        assert(u);
+
+        if (u->sessions)
+                return 1;
+
+        if (asprintf(&p, "/var/lib/systemd/linger/%s", u->name) < 0)
+                return -ENOMEM;
+
+        r = access(p, F_OK) >= 0;
+        free(p);
+
+        if (r > 0)
+                return 1;
+
+        if (u->cgroup_path) {
+                r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, false);
+                if (r < 0)
+                        return r;
+
+                if (r <= 0)
+                        return 1;
+        }
+
+        return 0;
+}
+
+UserState user_get_state(User *u) {
+        Session *i;
+
+        assert(u);
+
+        if (!u->sessions)
+                return USER_LINGERING;
+
+        LIST_FOREACH(sessions_by_user, i, u->sessions)
+                if (session_is_active(i))
+                        return USER_ACTIVE;
+
+        return USER_ONLINE;
+}
+
+static const char* const user_state_table[_USER_STATE_MAX] = {
+        [USER_OFFLINE] = "offline",
+        [USER_LINGERING] = "lingering",
+        [USER_ONLINE] = "online",
+        [USER_ACTIVE] = "active"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(user_state, UserState);