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systemctl add command list-dependencies

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systemctl list-dependencies lists all unit's dependecies and
recursively expands all subsidiary target units into a tree.

Primary purpose for this command is to show all units which are
enabled in specified target.
This commit is contained in:
Lukas Nykryn
2013-01-17 21:34:11 +01:00
committed by Kay Sievers
parent 86ed7ec58b
commit 55c0b89c57
4 changed files with 239 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
man/systemctl.xml
+11
View File
@@ -996,6 +996,17 @@
ordering and requirement
dependencies.</para></listitem>
</varlistentry>
<varlistentry>
<term><command>list-dependencies [NAME]</command></term>
<listitem><para>
Shows required and wanted units of given unit.
Target units are recursively expanded.
When <option>--all</option> is passed
dependency tree is generated for all
subsidiary units.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><command>snapshot [NAME]</command></term>
src/shared/util.c
+2
View File
@@ -5648,12 +5648,14 @@ const char *draw_special_char(DrawSpecialChar ch) {
[DRAW_TREE_VERT] = "\342\224\202 ", /* │ */
[DRAW_TREE_BRANCH] = "\342\224\234\342\224\200", /* ├─ */
[DRAW_TREE_RIGHT] = "\342\224\224\342\224\200", /* └─ */
[DRAW_TREE_SPACE] = " ", /* */
[DRAW_TRIANGULAR_BULLET] = "\342\200\243 ", /* ‣ */
},
/* ASCII fallback */ {
[DRAW_TREE_VERT] = "| ",
[DRAW_TREE_BRANCH] = "|-",
[DRAW_TREE_RIGHT] = "`-",
[DRAW_TREE_SPACE] = " ",
[DRAW_TRIANGULAR_BULLET] = "> ",
}
};
src/shared/util.h
+1
View File
@@ -555,6 +555,7 @@ typedef enum DrawSpecialChar {
DRAW_TREE_VERT,
DRAW_TREE_BRANCH,
DRAW_TREE_RIGHT,
DRAW_TREE_SPACE,
DRAW_TRIANGULAR_BULLET,
_DRAW_SPECIAL_CHAR_MAX
} DrawSpecialChar;
src/systemctl/systemctl.c
+225 -2
View File
@@ -710,6 +710,226 @@ static int list_unit_files(DBusConnection *bus, char **args) {
return 0;
}
static int list_dependencies_print(const char *name, int level, unsigned int branches, bool last) {
int i;
_cleanup_free_ char *n = NULL;
size_t len = 0;
size_t max_len = MAX(columns(),20);
for (i = level - 1; i >= 0; i--) {
len += 2;
if(len > max_len - 3 && !arg_full) {
printf("%s...\n",max_len % 2 ? "" : " ");
return 0;
}
printf("%s", draw_special_char(branches & (1 << i) ? DRAW_TREE_VERT : DRAW_TREE_SPACE));
}
len += 2;
if(len > max_len - 3 && !arg_full) {
printf("%s...\n",max_len % 2 ? "" : " ");
return 0;
}
printf("%s", draw_special_char(last ? DRAW_TREE_RIGHT : DRAW_TREE_BRANCH));
if(arg_full){
printf("%s\n", name);
return 0;
}
n = ellipsize(name, max_len-len, 100);
if(!n)
return log_oom();
printf("%s\n", n);
return 0;
}
static int list_dependencies_get_dependencies(DBusConnection *bus, const char *name, char ***deps) {
static const char * const dependencies[] = {
"Requires",
"RequiresOverridable",
"Requisite",
"RequisiteOverridable",
"Wants"
};
_cleanup_free_ char *path;
const char *interface = "org.freedesktop.systemd1.Unit";
_cleanup_dbus_message_unref_ DBusMessage *reply = NULL;
DBusMessageIter iter, sub, sub2, sub3;
int r = 0;
unsigned int i;
char **ret = NULL;
char **c;
assert(bus);
assert(name);
assert(deps);
path = unit_dbus_path_from_name(name);
if (path == NULL) {
r = -EINVAL;
goto finish;
}
r = bus_method_call_with_reply(
bus,
"org.freedesktop.systemd1",
path,
"org.freedesktop.DBus.Properties",
"GetAll",
&reply,
NULL,
DBUS_TYPE_STRING, &interface,
DBUS_TYPE_INVALID);
if (r < 0)
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);
dbus_message_iter_next(&sub);
for (i = 0; i < ELEMENTSOF(dependencies); i++)
if (streq(dependencies[i], prop)) {
break;
}
if (i == ELEMENTSOF(dependencies))
continue;
if (dbus_message_iter_get_arg_type(&sub3) == DBUS_TYPE_ARRAY) {
if (dbus_message_iter_get_element_type(&sub3) == DBUS_TYPE_STRING) {
DBusMessageIter sub4;
dbus_message_iter_recurse(&sub3, &sub4);
while (dbus_message_iter_get_arg_type(&sub4) != DBUS_TYPE_INVALID) {
const char *s;
assert(dbus_message_iter_get_arg_type(&sub4) == DBUS_TYPE_STRING);
dbus_message_iter_get_basic(&sub4, &s);
c = strv_append(ret, s);
if (c == NULL) {
r = log_oom();
goto finish;
}
strv_free(ret);
ret = c;
dbus_message_iter_next(&sub4);
}
}
}
}
finish:
if (r < 0)
strv_freep(&ret);
*deps = ret;
return r;
}
static int list_dependencies_compare(const void *_a, const void *_b) {
const char **a = (const char**) _a, **b = (const char**) _b;
if (unit_name_to_type(*a) == UNIT_TARGET && unit_name_to_type(*b) != UNIT_TARGET)
return 1;
if (unit_name_to_type(*a) != UNIT_TARGET && unit_name_to_type(*b) == UNIT_TARGET)
return -1;
return strcasecmp(*a, *b);
}
static int list_dependencies_one(DBusConnection *bus, const char *name, int level, char **units, unsigned int branches) {
char **deps = NULL;
char **c;
char **u = NULL;
int r = 0;
u = strv_append(units, name);
if(!u)
return log_oom();
r = list_dependencies_get_dependencies(bus, name, &deps);
if (r < 0)
goto finish;
qsort(deps, strv_length(deps), sizeof (char*), list_dependencies_compare);
STRV_FOREACH(c, deps) {
if (strv_contains(u, *c)) {
r = list_dependencies_print("...", level + 1, (branches << 1) | (c[1] == NULL ? 0 : 1), 1);
if(r < 0)
goto finish;
continue;
}
r = list_dependencies_print(*c, level, branches, c[1] == NULL);
if(r < 0)
goto finish;
if (arg_all || unit_name_to_type(*c) == UNIT_TARGET) {
r = list_dependencies_one(bus, *c, level + 1, u, (branches << 1) | (c[1] == NULL ? 0 : 1));
if(r < 0)
goto finish;
}
}
r = 0;
finish:
strv_free(deps);
strv_free(u);
return r;
}
static int list_dependencies(DBusConnection *bus, char **args) {
int r = 0;
_cleanup_free_ char *unit = NULL;
assert(bus);
assert(args[1]);
unit = unit_name_mangle(args[1]);
if (!unit)
return log_oom();
pager_open_if_enabled();
printf("%s\n", unit);
r = list_dependencies_one(bus, unit, 0, NULL, 0);
return r;
}
static int dot_one_property(const char *name, const char *prop, DBusMessageIter *iter) {
static const char * const colors[] = {
@@ -4063,7 +4283,7 @@ static int systemctl_help(void) {
" status [NAME...|PID...] Show runtime status of one or more units\n"
" show [NAME...|JOB...] Show properties of one or more\n"
" units/jobs or the manager\n"
" help [NAME...|PID...] Show manual for one or more units\n"
" help [NAME...|PID...] Show manual for one or more units\n"
" reset-failed [NAME...] Reset failed state for all, one, or more\n"
" units\n"
" set-cgroup [NAME] [CGROUP...] Add unit to a control group\n"
@@ -4072,7 +4292,9 @@ static int systemctl_help(void) {
" Set control group attribute\n"
" unset-cgroup-attr [NAME] [ATTR...]\n"
" Unset control group attribute\n"
" load [NAME...] Load one or more units\n\n"
" load [NAME...] Load one or more units\n"
" list-dependencies [NAME] Recursively show units which are required\n"
" or wanted by this unit\n\n"
"Unit File Commands:\n"
" list-unit-files List installed unit files\n"
" enable [NAME...] Enable one or more unit files\n"
@@ -5088,6 +5310,7 @@ static int systemctl_main(DBusConnection *bus, int argc, char *argv[], DBusError
{ "unmask", MORE, 2, enable_unit },
{ "link", MORE, 2, enable_unit },
{ "switch-root", MORE, 2, switch_root },
{ "list-dependencies", EQUAL, 2, list_dependencies },
};
int left;