chiark / gitweb /
build: basic autoconfization
[elogind.git] / unit.c
diff --git a/unit.c b/unit.c
index 4076120..a14e18e 100644 (file)
--- a/unit.c
+++ b/unit.c
@@ -1,5 +1,24 @@
 /*-*- Mode: C; c-basic-offset: 8 -*-*/
 
+/***
+  This file is part of systemd.
+
+  Copyright 2010 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 <assert.h>
 #include <errno.h>
 #include <string.h>
@@ -44,7 +63,7 @@ UnitType unit_name_to_type(const char *n) {
         "0123456789"                            \
         "abcdefghijklmnopqrstuvwxyz"            \
         "ABCDEFGHIJKLMNOPQRSTUVWXYZ"            \
-        "-_"
+        "-_.\\"
 
 bool unit_name_is_valid(const char *n) {
         UnitType t;
@@ -147,6 +166,9 @@ int unit_add_name(Unit *u, const char *text) {
                 return r;
         }
 
+        if (u->meta.type == _UNIT_TYPE_INVALID)
+                LIST_PREPEND(Meta, units_per_type, u->meta.manager->units_per_type[t], &u->meta);
+
         u->meta.type = t;
 
         if (!u->meta.id)
@@ -155,6 +177,34 @@ int unit_add_name(Unit *u, const char *text) {
         return 0;
 }
 
+int unit_choose_id(Unit *u, const char *name) {
+        char *s;
+
+        assert(u);
+        assert(name);
+
+        /* Selects one of the names of this unit as the id */
+
+        if (!(s = set_get(u->meta.names, (char*) name)))
+                return -ENOENT;
+
+        u->meta.id = s;
+        return 0;
+}
+
+int unit_set_description(Unit *u, const char *description) {
+        char *s;
+
+        assert(u);
+
+        if (!(s = strdup(description)))
+                return -ENOMEM;
+
+        free(u->meta.description);
+        u->meta.description = s;
+        return 0;
+}
+
 void unit_add_to_load_queue(Unit *u) {
         assert(u);
 
@@ -196,6 +246,9 @@ void unit_free(Unit *u) {
         SET_FOREACH(t, u->meta.names, i)
                 hashmap_remove_value(u->meta.manager->units, t, u);
 
+        if (u->meta.type != _UNIT_TYPE_INVALID)
+                LIST_REMOVE(Meta, units_per_type, u->meta.manager->units_per_type[u->meta.type], &u->meta);
+
         if (u->meta.in_load_queue)
                 LIST_REMOVE(Meta, load_queue, u->meta.manager->load_queue, &u->meta);
 
@@ -295,55 +348,32 @@ const char *unit_description(Unit *u) {
 
 void unit_dump(Unit *u, FILE *f, const char *prefix) {
 
-        static const char* const load_state_table[_UNIT_LOAD_STATE_MAX] = {
-                [UNIT_STUB] = "stub",
-                [UNIT_LOADED] = "loaded",
-                [UNIT_FAILED] = "failed"
-        };
-
-        static const char* const active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
-                [UNIT_ACTIVE] = "active",
-                [UNIT_INACTIVE] = "inactive",
-                [UNIT_ACTIVATING] = "activating",
-                [UNIT_DEACTIVATING] = "deactivating"
-        };
-
-        static const char* const dependency_table[_UNIT_DEPENDENCY_MAX] = {
-                [UNIT_REQUIRES] = "Requires",
-                [UNIT_SOFT_REQUIRES] = "SoftRequires",
-                [UNIT_WANTS] = "Wants",
-                [UNIT_REQUISITE] = "Requisite",
-                [UNIT_SOFT_REQUISITE] = "SoftRequisite",
-                [UNIT_REQUIRED_BY] = "RequiredBy",
-                [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
-                [UNIT_WANTED_BY] = "WantedBy",
-                [UNIT_CONFLICTS] = "Conflicts",
-                [UNIT_BEFORE] = "Before",
-                [UNIT_AFTER] = "After",
-        };
-
         char *t;
         UnitDependency d;
         Iterator i;
-        char *prefix2;
+        char *p2;
+        const char *prefix2;
 
         assert(u);
 
         if (!prefix)
                 prefix = "";
-        prefix2 = strappend(prefix, "\t");
-        if (!prefix2)
-                prefix2 = "";
+        p2 = strappend(prefix, "\t");
+        prefix2 = p2 ? p2 : prefix;
 
         fprintf(f,
                 "%s→ Unit %s:\n"
                 "%s\tDescription: %s\n"
                 "%s\tUnit Load State: %s\n"
-                "%s\tUnit Active State: %s\n",
+                "%s\tUnit Active State: %s\n"
+                "%s\tRecursive Stop: %s\n"
+                "%s\tStop When Unneeded: %s\n",
                 prefix, unit_id(u),
                 prefix, unit_description(u),
-                prefix, load_state_table[u->meta.load_state],
-                prefix, active_state_table[unit_active_state(u)]);
+                prefix, unit_load_state_to_string(u->meta.load_state),
+                prefix, unit_active_state_to_string(unit_active_state(u)),
+                prefix, yes_no(u->meta.recursive_stop),
+                prefix, yes_no(u->meta.stop_when_unneeded));
 
         if (u->meta.load_path)
                 fprintf(f, "%s\tLoad Path: %s\n", prefix, u->meta.load_path);
@@ -358,7 +388,7 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
                         continue;
 
                 SET_FOREACH(other, u->meta.dependencies[d], i)
-                        fprintf(f, "%s\t%s: %s\n", prefix, dependency_table[d], unit_id(other));
+                        fprintf(f, "%s\t%s: %s\n", prefix, unit_dependency_to_string(d), unit_id(other));
         }
 
         if (UNIT_VTABLE(u)->dump)
@@ -367,7 +397,7 @@ void unit_dump(Unit *u, FILE *f, const char *prefix) {
         if (u->meta.job)
                 job_dump(u->meta.job, f, prefix2);
 
-        free(prefix2);
+        free(p2);
 }
 
 /* Common implementation for multiple backends */
@@ -504,6 +534,39 @@ bool unit_can_reload(Unit *u) {
         return UNIT_VTABLE(u)->can_reload(u);
 }
 
+static void unit_check_uneeded(Unit *u) {
+        Iterator i;
+        Unit *other;
+
+        assert(u);
+
+        /* If this service shall be shut down when unneeded then do
+         * so. */
+
+        if (!u->meta.stop_when_unneeded)
+                return;
+
+        if (!UNIT_IS_ACTIVE_OR_ACTIVATING(unit_active_state(u)))
+                return;
+
+        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        return;
+
+        SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRED_BY], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        return;
+
+        SET_FOREACH(other, u->meta.dependencies[UNIT_WANTED_BY], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        return;
+
+        log_debug("Service %s is not needed anymore. Stopping.", unit_id(u));
+
+        /* Ok, nobody needs us anymore. Sniff. Then let's commit suicide */
+        manager_add_job(u->meta.manager, JOB_STOP, u, JOB_FAIL, true, NULL);
+}
+
 static void retroactively_start_dependencies(Unit *u) {
         Iterator i;
         Unit *other;
@@ -539,9 +602,29 @@ static void retroactively_stop_dependencies(Unit *u) {
         assert(u);
         assert(UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(u)));
 
-        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
+        if (u->meta.recursive_stop) {
+                /* Pull down units need us recursively if enabled */
+                SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRED_BY], i)
+                        if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                                manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
+        }
+
+        /* Garbage collect services that might not be needed anymore, if enabled */
+        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUIRES], i)
                 if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
-                        manager_add_job(u->meta.manager, JOB_STOP, other, JOB_REPLACE, true, NULL);
+                        unit_check_uneeded(other);
+        SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUIRES], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        unit_check_uneeded(other);
+        SET_FOREACH(other, u->meta.dependencies[UNIT_WANTS], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        unit_check_uneeded(other);
+        SET_FOREACH(other, u->meta.dependencies[UNIT_REQUISITE], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        unit_check_uneeded(other);
+        SET_FOREACH(other, u->meta.dependencies[UNIT_SOFT_REQUISITE], i)
+                if (!UNIT_IS_INACTIVE_OR_DEACTIVATING(unit_active_state(other)))
+                        unit_check_uneeded(other);
 }
 
 void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
@@ -571,7 +654,7 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
                 else {
                         assert(u->meta.job->state == JOB_RUNNING);
 
-                        /* Let's check of this state change
+                        /* Let's check whether this state change
                          * constitutes a finished job, or maybe
                          * cotradicts a running job and hence needs to
                          * invalidate jobs. */
@@ -631,6 +714,10 @@ void unit_notify(Unit *u, UnitActiveState os, UnitActiveState ns) {
                 retroactively_start_dependencies(u);
         else if (UNIT_IS_ACTIVE_OR_ACTIVATING(os) && UNIT_IS_INACTIVE_OR_DEACTIVATING(ns))
                 retroactively_stop_dependencies(u);
+
+        /* Maybe we finished startup and are now ready for being
+         * stopped because unneeded? */
+        unit_check_uneeded(u);
 }
 
 int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
@@ -639,7 +726,7 @@ int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
         assert(u);
         assert(fd >= 0);
         assert(w);
-        assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->unit == u));
+        assert(w->type == WATCH_INVALID || (w->type == WATCH_FD && w->fd == fd && w->data.unit == u));
 
         zero(ev);
         ev.data.ptr = w;
@@ -653,7 +740,7 @@ int unit_watch_fd(Unit *u, int fd, uint32_t events, Watch *w) {
 
         w->fd = fd;
         w->type = WATCH_FD;
-        w->unit = u;
+        w->data.unit = u;
 
         return 0;
 }
@@ -665,12 +752,13 @@ void unit_unwatch_fd(Unit *u, Watch *w) {
         if (w->type == WATCH_INVALID)
                 return;
 
-        assert(w->type == WATCH_FD && w->unit == u);
+        assert(w->type == WATCH_FD);
+        assert(w->data.unit == u);
         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
 
         w->fd = -1;
         w->type = WATCH_INVALID;
-        w->unit = NULL;
+        w->data.unit = NULL;
 }
 
 int unit_watch_pid(Unit *u, pid_t pid) {
@@ -694,7 +782,7 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
 
         assert(u);
         assert(w);
-        assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->unit == u));
+        assert(w->type == WATCH_INVALID || (w->type == WATCH_TIMER && w->data.unit == u));
 
         /* This will try to reuse the old timer if there is one */
 
@@ -730,7 +818,7 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
 
                 zero(ev);
                 ev.data.ptr = w;
-                ev.events = POLLIN;
+                ev.events = EPOLLIN;
 
                 if (epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_ADD, fd, &ev) < 0)
                         goto fail;
@@ -738,13 +826,13 @@ int unit_watch_timer(Unit *u, usec_t delay, Watch *w) {
 
         w->fd = fd;
         w->type = WATCH_TIMER;
-        w->unit = u;
+        w->data.unit = u;
 
         return 0;
 
 fail:
         if (ours)
-                assert_se(close_nointr(fd) == 0);
+                close_nointr_nofail(fd);
 
         return -errno;
 }
@@ -756,14 +844,14 @@ void unit_unwatch_timer(Unit *u, Watch *w) {
         if (w->type == WATCH_INVALID)
                 return;
 
-        assert(w->type == WATCH_TIMER && w->unit == u);
+        assert(w->type == WATCH_TIMER && w->data.unit == u);
 
         assert_se(epoll_ctl(u->meta.manager->epoll_fd, EPOLL_CTL_DEL, w->fd, NULL) >= 0);
         assert_se(close_nointr(w->fd) == 0);
 
         w->fd = -1;
         w->type = WATCH_INVALID;
-        w->unit = NULL;
+        w->data.unit = NULL;
 }
 
 bool unit_job_is_applicable(Unit *u, JobType j) {
@@ -836,6 +924,19 @@ int unit_add_dependency(Unit *u, UnitDependency d, Unit *other) {
         return 0;
 }
 
+int unit_add_dependency_by_name(Unit *u, UnitDependency d, const char *name) {
+        Unit *other;
+        int r;
+
+        if ((r = manager_load_unit(u->meta.manager, name, &other)) < 0)
+                return r;
+
+        if ((r = unit_add_dependency(u, d, other)) < 0)
+                return r;
+
+        return 0;
+}
+
 const char *unit_path(void) {
         char *e;
 
@@ -874,3 +975,114 @@ int set_unit_path(const char *p) {
 
         return 0;
 }
+
+char *unit_name_escape_path(const char *prefix, const char *path, const char *suffix) {
+        char *r, *t;
+        const char *f;
+        size_t a, b, c;
+
+        assert(path);
+
+        /* Takes a path and a suffix and prefix and makes a nice
+         * string suitable as unit name of it, escaping all weird
+         * chars on the way.
+         *
+         * / becomes ., and all chars not alloweed in a unit name get
+         * escaped as \xFF, including \ and ., of course. This
+         * escaping is hence reversible.
+         */
+
+        if (!prefix)
+                prefix = "";
+
+        if (!suffix)
+                suffix = "";
+
+        a = strlen(prefix);
+        b = strlen(path);
+        c = strlen(suffix);
+
+        if (!(r = new(char, a+b*4+c+1)))
+                return NULL;
+
+        memcpy(r, prefix, a);
+
+        for (f = path, t = r+a; *f; f++) {
+                if (*f == '/')
+                        *(t++) = '.';
+                else if (*f == '.' || *f == '\\' || !strchr(VALID_CHARS, *f)) {
+                        *(t++) = '\\';
+                        *(t++) = 'x';
+                        *(t++) = hexchar(*f > 4);
+                        *(t++) = hexchar(*f);
+                } else
+                        *(t++) = *f;
+        }
+
+        memcpy(t, suffix, c+1);
+
+        return r;
+}
+
+char *unit_dbus_path(Unit *u) {
+        char *p, *e;
+
+        assert(u);
+
+        if (!(e = bus_path_escape(unit_id(u))))
+                return NULL;
+
+        if (asprintf(&p, "/org/freedesktop/systemd1/unit/%s", e) < 0) {
+                free(e);
+                return NULL;
+        }
+
+        free(e);
+        return p;
+}
+
+static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
+        [UNIT_SERVICE] = "service",
+        [UNIT_TIMER] = "timer",
+        [UNIT_SOCKET] = "socket",
+        [UNIT_TARGET] = "target",
+        [UNIT_DEVICE] = "device",
+        [UNIT_MOUNT] = "mount",
+        [UNIT_AUTOMOUNT] = "automount",
+        [UNIT_SNAPSHOT] = "snapshot"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
+
+static const char* const unit_load_state_table[_UNIT_LOAD_STATE_MAX] = {
+        [UNIT_STUB] = "stub",
+        [UNIT_LOADED] = "loaded",
+        [UNIT_FAILED] = "failed"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_load_state, UnitLoadState);
+
+static const char* const unit_active_state_table[_UNIT_ACTIVE_STATE_MAX] = {
+        [UNIT_ACTIVE] = "active",
+        [UNIT_INACTIVE] = "inactive",
+        [UNIT_ACTIVATING] = "activating",
+        [UNIT_DEACTIVATING] = "deactivating"
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_active_state, UnitActiveState);
+
+static const char* const unit_dependency_table[_UNIT_DEPENDENCY_MAX] = {
+        [UNIT_REQUIRES] = "Requires",
+        [UNIT_SOFT_REQUIRES] = "SoftRequires",
+        [UNIT_WANTS] = "Wants",
+        [UNIT_REQUISITE] = "Requisite",
+        [UNIT_SOFT_REQUISITE] = "SoftRequisite",
+        [UNIT_REQUIRED_BY] = "RequiredBy",
+        [UNIT_SOFT_REQUIRED_BY] = "SoftRequiredBy",
+        [UNIT_WANTED_BY] = "WantedBy",
+        [UNIT_CONFLICTS] = "Conflicts",
+        [UNIT_BEFORE] = "Before",
+        [UNIT_AFTER] = "After",
+};
+
+DEFINE_STRING_TABLE_LOOKUP(unit_dependency, UnitDependency);