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systemctl: add to command for virtualizing the dependency tree with graphviz

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This commit is contained in:
Lennart Poettering 2010-07-16 02:56:00 +02:00
parent 14bd37fe0b
commit 4445a87557
3 changed files with 343 additions and 6 deletions
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32
fixme
View File

@ -35,6 +35,38 @@
* systemctl status $PID, systemctl stop $PID!
* systemctl list-units doesn't show units with actvie jobs?
* timeout waiting for mount devices?
* default logic for serial getty, ck logging, ssk readahead
* place /etc/inittab with explaining blurb.
* OnFailure=foo.unit
* default.target must be %ghosted...
* systemd.path muss irgendwie nen sinvolles Defaultdependencies=True kriegen, genaus timer usw.
* In command lines, support both "$FOO" and $FOO
* systemd-install disable should recursively kill all symlinks
* __nss_disable_nscd() aufrufen um loops zu verhindern
* in %post create all symlinks manually and use inittab data
* check mtimes of dirs and unit files in systemctl
* /etc must always take precedence even if we follow symlinks!
* when adding default deps to targets, check if they are already there and skip
* /lib/init/rw
* vielleicht implizit immer auf syslog dependen?
External:
* patch /etc/init.d/functions with:

44
man/systemctl.xml
View File

@ -127,6 +127,32 @@
necessary.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--order</option></term>
<term><option>--require</option></term>
<listitem><para>When used in
conjunction with the
<command>dot</command> command (see
below), selects which dependencies are
shown in the dependency graph. If
<option>--order</option> is passed
only dependencies of type
<varname>After=</varname> or
<varname>Before=</varname> are
shown. If <option>--require</option>
is passed only dependencies of type
<varname>Requires=</varname>,
<varname>RequiresOverridable=</varname>,
<varname>Requisite=</varname>,
<varname>RequisiteOverridable=</varname>,
<varname>Wants=</varname> and
<varname>Conflicts=</varname> are
shown. If neither is passed, shows
dependencies of all these
types.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--system</option></term>
@ -355,6 +381,24 @@
be parsed by
applications.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>dot</command></term>
<listitem><para>Generate textual
dependency graph description in dot
format for further processing with the
GraphViz
<citerefentry><refentrytitle>dot</refentrytitle><manvolnum>1</manvolnum></citerefentry>
tool. Use a command line like
<command>systemctl dot | dot -Tsvg >
systemd.svg</command> to generate a
graphical dependency tree. Unless
<option>--order</option> or
<option>--require</option> is passed
the generated graph will show both
ordering and requirement
dependencies.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>snapshot [NAME]</command></term>

273
src/systemctl.c
View File

@ -59,7 +59,7 @@ static bool arg_no_wall = false;
static bool arg_dry = false;
static bool arg_quiet = false;
static char **arg_wall = NULL;
enum action {
static enum action {
ACTION_INVALID,
ACTION_SYSTEMCTL,
ACTION_HALT,
@ -77,6 +77,11 @@ enum action {
ACTION_RUNLEVEL,
_ACTION_MAX
} arg_action = ACTION_SYSTEMCTL;
static enum dot {
DOT_ALL,
DOT_ORDER,
DOT_REQUIRE
} arg_dot = DOT_ALL;
static bool private_bus = false;
@ -186,7 +191,7 @@ static int list_units(DBusConnection *bus, char **args, unsigned n) {
printf("%-45s %-6s %-12s %-12s %-15s %s\n", "UNIT", "LOAD", "ACTIVE", "SUB", "JOB", "DESCRIPTION");
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *id, *description, *load_state, *active_state, *sub_state, *unit_state, *job_type, *job_path, *dot;
const char *id, *description, *load_state, *active_state, *sub_state, *unit_path, *job_type, *job_path, *dot;
uint32_t job_id;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
@ -202,7 +207,7 @@ static int list_units(DBusConnection *bus, char **args, unsigned n) {
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &load_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &active_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &sub_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_path, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_UINT32, &job_id, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &job_type, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &job_path, false) < 0) {
@ -247,7 +252,247 @@ static int list_units(DBusConnection *bus, char **args, unsigned n) {
if (arg_all)
printf("\n%u units listed.\n", k);
else
printf("\n%u live units listed. Pass --all to see dead units, too.\n", k);
printf("\n%u units listed. Pass --all to see inactive units, too.\n", k);
r = 0;
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int dot_one_property(const char *name, const char *prop, DBusMessageIter *iter) {
static const char * const colors[] = {
"Requires", "[color=\"black\"]",
"RequiresOverridable", "[color=\"black\"]",
"Requisite", "[color=\"darkblue\"]",
"RequisiteOverridable", "[color=\"darkblue\"]",
"Wants", "[color=\"darkgrey\"]",
"Conflicts", "[color=\"red\"]",
"After", "[color=\"green\"]"
};
const char *c = NULL;
unsigned i;
assert(name);
assert(prop);
assert(iter);
for (i = 0; i < ELEMENTSOF(colors); i += 2)
if (streq(colors[i], prop)) {
c = colors[i+1];
break;
}
if (!c)
return 0;
if (arg_dot != DOT_ALL)
if ((arg_dot == DOT_ORDER) != streq(prop, "After"))
return 0;
switch (dbus_message_iter_get_arg_type(iter)) {
case DBUS_TYPE_ARRAY:
if (dbus_message_iter_get_element_type(iter) == DBUS_TYPE_STRING) {
DBusMessageIter sub;
dbus_message_iter_recurse(iter, &sub);
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *s;
assert(dbus_message_iter_get_arg_type(&sub) == DBUS_TYPE_STRING);
dbus_message_iter_get_basic(&sub, &s);
printf("\t\"%s\"->\"%s\" %s;\n", name, s, c);
dbus_message_iter_next(&sub);
}
return 0;
}
}
return 0;
}
static int dot_one(DBusConnection *bus, const char *name, const char *path) {
DBusMessage *m = NULL, *reply = NULL;
const char *interface = "org.freedesktop.systemd1.Unit";
int r;
DBusError error;
DBusMessageIter iter, sub, sub2, sub3;
assert(bus);
assert(path);
dbus_error_init(&error);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
path,
"org.freedesktop.DBus.Properties",
"GetAll"))) {
log_error("Could not allocate message.");
r = -ENOMEM;
goto finish;
}
if (!dbus_message_append_args(m,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_INVALID)) {
log_error("Could not append arguments to message.");
r = -ENOMEM;
goto finish;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_DICT_ENTRY) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&iter, &sub);
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *prop;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_DICT_ENTRY) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub, &sub2);
if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &prop, true) < 0) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
if (dbus_message_iter_get_arg_type(&sub2) != DBUS_TYPE_VARIANT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub2, &sub3);
if (dot_one_property(name, prop, &sub3)) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_next(&sub);
}
finish:
if (m)
dbus_message_unref(m);
if (reply)
dbus_message_unref(reply);
dbus_error_free(&error);
return r;
}
static int dot(DBusConnection *bus, char **args, unsigned n) {
DBusMessage *m = NULL, *reply = NULL;
DBusError error;
int r;
DBusMessageIter iter, sub, sub2;
dbus_error_init(&error);
assert(bus);
if (!(m = dbus_message_new_method_call(
"org.freedesktop.systemd1",
"/org/freedesktop/systemd1",
"org.freedesktop.systemd1.Manager",
"ListUnits"))) {
log_error("Could not allocate message.");
return -ENOMEM;
}
if (!(reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error))) {
log_error("Failed to issue method call: %s", error.message);
r = -EIO;
goto finish;
}
if (!dbus_message_iter_init(reply, &iter) ||
dbus_message_iter_get_arg_type(&iter) != DBUS_TYPE_ARRAY ||
dbus_message_iter_get_element_type(&iter) != DBUS_TYPE_STRUCT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
printf("digraph systemd {\n");
dbus_message_iter_recurse(&iter, &sub);
while (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_INVALID) {
const char *id, *description, *load_state, *active_state, *sub_state, *unit_path;
if (dbus_message_iter_get_arg_type(&sub) != DBUS_TYPE_STRUCT) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
dbus_message_iter_recurse(&sub, &sub2);
if (bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &id, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &description, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &load_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &active_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_STRING, &sub_state, true) < 0 ||
bus_iter_get_basic_and_next(&sub2, DBUS_TYPE_OBJECT_PATH, &unit_path, true) < 0) {
log_error("Failed to parse reply.");
r = -EIO;
goto finish;
}
if ((r = dot_one(bus, id, unit_path)) < 0)
goto finish;
/* printf("\t\"%s\";\n", id); */
dbus_message_iter_next(&sub);
}
printf("}\n");
log_info(" Color legend: black = Requires\n"
" dark blue = Requisite\n"
" dark grey = Wants\n"
" red = Conflicts\n"
" green = After\n");
if (isatty(fileno(stdout)))
log_notice("-- You probably want to process this output with graphviz' dot tool.\n"
"-- Try a shell pipeline like 'systemctl dot | dot -Tsvg > systemd.svg'!\n");
r = 0;
@ -2504,6 +2749,8 @@ static int systemctl_help(void) {
" pending\n"
" --system Connect to system bus\n"
" --session Connect to session bus\n"
" --order When generating graph for dot, show only order\n"
" --require When generating graph for dot, show only requirement\n"
" -q --quiet Suppress output\n"
" --no-block Do not wait until operation finished\n"
" --no-wall Don't send wall message before halt/power-off/reboot\n\n"
@ -2529,6 +2776,7 @@ static int systemctl_help(void) {
" clear-jobs Cancel all jobs\n"
" monitor Monitor unit/job changes\n"
" dump Dump server status\n"
" dot Dump dependency graph for dot(1)\n"
" snapshot [NAME] Create a snapshot\n"
" delete [NAME...] Remove one or more snapshots\n"
" daemon-reload Reload systemd manager configuration\n"
@ -2620,7 +2868,9 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
ARG_SESSION,
ARG_SYSTEM,
ARG_NO_BLOCK,
ARG_NO_WALL
ARG_NO_WALL,
ARG_ORDER,
ARG_REQUIRE
};
static const struct option options[] = {
@ -2634,6 +2884,8 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
{ "no-block", no_argument, NULL, ARG_NO_BLOCK },
{ "no-wall", no_argument, NULL, ARG_NO_WALL },
{ "quiet", no_argument, NULL, 'q' },
{ "order", no_argument, NULL, ARG_ORDER },
{ "require", no_argument, NULL, ARG_REQUIRE },
{ NULL, 0, NULL, 0 }
};
@ -2687,6 +2939,14 @@ static int systemctl_parse_argv(int argc, char *argv[]) {
arg_no_wall = true;
break;
case ARG_ORDER:
arg_dot = DOT_ORDER;
break;
case ARG_REQUIRE:
arg_dot = DOT_REQUIRE;
break;
case 'q':
arg_quiet = true;
break;
@ -3212,6 +3472,7 @@ static int systemctl_main(DBusConnection *bus, int argc, char *argv[]) {
{ "status", MORE, 2, show },
{ "monitor", EQUAL, 1, monitor },
{ "dump", EQUAL, 1, dump },
{ "dot", EQUAL, 1, dot },
{ "snapshot", LESS, 2, snapshot },
{ "delete", MORE, 2, delete_snapshot },
{ "daemon-reload", EQUAL, 1, clear_jobs },
@ -3225,7 +3486,7 @@ static int systemctl_main(DBusConnection *bus, int argc, char *argv[]) {
{ "reboot", EQUAL, 1, start_special },
{ "default", EQUAL, 1, start_special },
{ "rescue", EQUAL, 1, start_special },
{ "emergency", EQUAL, 1, start_special }
{ "emergency", EQUAL, 1, start_special },
};
int left;