core: remove JoinControllers= configuration setting

This removes the ability to configure which cgroup controllers to mount
together. Instead, we'll now hardcode that "cpu" and "cpuacct" are
mounted together as well as "net_cls" and "net_prio".

The concept of mounting controllers together has no future as it does
not exist to cgroupsv2. Moreover, the current logic is systematically
broken, as revealed by the discussions in #10507. Also, we surveyed Red
Hat customers and couldn't find a single user of the concept (which
isn't particularly surprising, as it is broken...)

This reduced the (already way too complex) cgroup handling for us, since
we now know whenever we make a change to a cgroup for one controller to
which other controllers it applies.

1 files changed, 0 insertions, 40 deletions

diff --git a/src/test/test-conf-parser.c b/src/test/test-conf-parser.c
index 368e02cb33..497becff73 100644
--- a/src/test/test-conf-parser.c
+++ b/src/test/test-conf-parser.c
@@ -210,45 +210,6 @@ static void test_config_parse_iec_uint64(void) {
         assert_se(config_parse_iec_uint64(NULL, "/this/file", 11, "Section", 22, "Size", 0, "4.5M", &offset, NULL) == 0);
 }
 
-static void test_config_parse_join_controllers(void) {
-        int r;
-        _cleanup_(strv_free_freep) char ***c = NULL;
-        char ***c2;
-
-        /* Test normal operation */
-        r = config_parse_join_controllers(NULL, "example.conf", 11, "Section", 10, "JoinControllers", 0, "cpu,cpuacct net_cls,netprio", &c, NULL);
-        assert_se(r == 0);
-        assert_se(c);
-        assert_se(strv_length(c[0]) == 2);
-        assert_se(strv_equal(c[0], STRV_MAKE("cpu", "cpuacct")));
-        assert_se(strv_length(c[1]) == 2);
-        assert_se(strv_equal(c[1], STRV_MAKE("net_cls", "netprio")));
-        assert_se(c[2] == NULL);
-
-        /* Test special case of no mounted controllers */
-        r = config_parse_join_controllers(NULL, "example.conf", 12, "Section", 10, "JoinControllers", 0, "", &c, NULL);
-        assert_se(r == 0);
-        assert_se(c);
-        assert_se(strv_equal(c[0], STRV_MAKE_EMPTY));
-        assert_se(c[1] == NULL);
-
-        /* Test merging of overlapping lists */
-        r = config_parse_join_controllers(NULL, "example.conf", 13, "Section", 10, "JoinControllers", 0, "a,b b,c", &c, NULL);
-        assert_se(r == 0);
-        assert_se(c);
-        assert_se(strv_length(c[0]) == 3);
-        assert_se(strv_contains(c[0], "a"));
-        assert_se(strv_contains(c[0], "b"));
-        assert_se(strv_contains(c[0], "c"));
-        assert_se(c[1] == NULL);
-
-        /* Test ignoring of bad lines */
-        c2 = c;
-        r = config_parse_join_controllers(NULL, "example.conf", 14, "Section", 10, "JoinControllers", 0, "a,\"b ", &c, NULL);
-        assert_se(r < 0);
-        assert_se(c == c2);
-}
-
 #define x10(x) x x x x x x x x x x
 #define x100(x) x10(x10(x))
 #define x1000(x) x10(x100(x))
@@ -407,7 +368,6 @@ int main(int argc, char **argv) {
         test_config_parse_sec();
         test_config_parse_nsec();
         test_config_parse_iec_uint64();
-        test_config_parse_join_controllers();
 
         for (i = 0; i < ELEMENTSOF(config_file); i++)
                 test_config_parse(i, config_file[i]);