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core: add a new GetUnitByControlGroup() bus call

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This is useful for foreign container runtimes implementing the OCI
runtime spec, which only wants to deal with cgroup paths. There's
already an API to translate units into cgroup paths, with this we add
the reverse.
This commit is contained in:
Lennart Poettering 2018-04-25 13:34:47 +02:00
parent 04b56d9d9c
commit 267dd427da
2 changed files with 31 additions and 0 deletions
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27
src/core/dbus-manager.c
View File

@ -544,6 +544,32 @@ static int method_get_unit_by_invocation_id(sd_bus_message *message, void *userd
return sd_bus_reply_method_return(message, "o", path);
}
static int method_get_unit_by_control_group(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *path = NULL;
Manager *m = userdata;
const char *cgroup;
Unit *u;
int r;
r = sd_bus_message_read(message, "s", &cgroup);
if (r < 0)
return r;
u = manager_get_unit_by_cgroup(m, cgroup);
if (!u)
return sd_bus_error_setf(error, BUS_ERROR_NO_SUCH_UNIT, "Control group '%s' is not valid or not managed by this instance", cgroup);
r = mac_selinux_unit_access_check(u, message, "status", error);
if (r < 0)
return r;
path = unit_dbus_path(u);
if (!path)
return -ENOMEM;
return sd_bus_reply_method_return(message, "o", path);
}
static int method_load_unit(sd_bus_message *message, void *userdata, sd_bus_error *error) {
_cleanup_free_ char *path = NULL;
Manager *m = userdata;
@ -2539,6 +2565,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
SD_BUS_METHOD("GetUnit", "s", "o", method_get_unit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetUnitByPID", "u", "o", method_get_unit_by_pid, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetUnitByInvocationID", "ay", "o", method_get_unit_by_invocation_id, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("GetUnitByControlGroup", "s", "o", method_get_unit_by_control_group, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("LoadUnit", "s", "o", method_load_unit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("StartUnit", "ss", "o", method_start_unit, SD_BUS_VTABLE_UNPRIVILEGED),
SD_BUS_METHOD("StartUnitReplace", "sss", "o", method_start_unit_replace, SD_BUS_VTABLE_UNPRIVILEGED),

4
src/core/org.freedesktop.systemd1.conf
View File

@ -60,6 +60,10 @@
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitByInvocationID"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="GetUnitByControlGroup"/>
<allow send_destination="org.freedesktop.systemd1"
send_interface="org.freedesktop.systemd1.Manager"
send_member="LoadUnit"/>