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Fix #188: support without cgroups v2 support

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This patch adds support for detecting if the Linux kernel Fint runs on
has support for cgroups v2.  The probe is done very early, in runlevel
S, when attempting to mount /sys/fs/cgroup.  Meaning, the log message
may be lost on systems that do not run sysklogd[1].

Here's the relevant logs from a system running myLinux on a kernel
that has cgroups v2 support disabled:

    Jan 10 20:19:40 anarchy finit[1]: myLinux 2021.11-696-g8fddaf36ed, entering runlevel S
    Jan 10 20:19:40 anarchy finit[1]: Kernel does not support cgroups v2, disabling.
    Jan 10 20:19:41 anarchy finit[1]: myLinux 2021.11-696-g8fddaf36ed, entering runlevel 2

All code paths that attempt to set or query kernel cgroups config has
been short circuited when this happens.  However, this does not apply
to any cgroup related config in the Finit .conf files -- which may of
course be omitted.  Yet, if configuration directives exist, they will
be parsed and may cause error.

Also, the initctl tool checks if /sys/fs/cgroup is mounted at runtime
and disables all status output and commands that rely on the feature.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg committed 2022-01-10 21:21:35 +01:00
1 parent d331b72dfd
commit a37037ded4
4 files changed
+108 -53
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src/initctl.c
+72 -52
View File
@@ -51,6 +51,7 @@ struct cmd {
char *cmd;
struct cmd *ctx;
int (*cb)(char *arg);
int *cond;
};
int icreate = 0;
@@ -62,6 +63,8 @@ int verbose = 0;
int plain = 0;
int quiet = 0;
int runlevel = 0;
int cgrp = 0;
int iw, pw;
extern int reboot_main(int argc, char *argv[]);
@@ -711,11 +714,7 @@ static int show_status(char *arg)
while (arg && arg[0]) {
long now = jiffies();
char uptm[42] = "N/A";
char grbuf[128];
char path[256];
struct cg *cg;
int exact = 0;
char *group;
for (svc = client_svc_iterator(1); svc; svc = client_svc_iterator(0)) {
svc_ident(svc, ident, sizeof(ident));
@@ -735,10 +734,6 @@ static int show_status(char *arg)
if (quiet)
return svc->state != SVC_RUNNING_STATE;
group = pid_cgroup(svc->pid, grbuf, sizeof(grbuf));
snprintf(path, sizeof(path), "%s/%s", FINIT_CGPATH, group);
cg = cg_conf(path);
printf(" Status : %s\n", status(svc, 1));
printf(" Identity : %s\n", svc_ident(svc, ident, sizeof(ident)));
printf("Description : %s\n", svc->desc);
@@ -752,7 +747,16 @@ static int show_status(char *arg)
printf(" Group : %s\n", svc->group);
printf(" Uptime : %s\n", svc->pid ? uptime(now - svc->start_time, uptm, sizeof(uptm)) : uptm);
printf(" Runlevels : %s\n", runlevel_string(runlevel, svc->runlevels));
if (svc->pid > 1) {
if (cgrp && svc->pid > 1) {
char grbuf[128];
char path[256];
struct cg *cg;
char *group;
group = pid_cgroup(svc->pid, grbuf, sizeof(grbuf));
snprintf(path, sizeof(path), "%s/%s", FINIT_CGPATH, group);
cg = cg_conf(path);
printf(" Memory : %s\n", memsz(cgroup_memory(group), uptm, sizeof(uptm)));
printf(" CGroup : %s cpu %s [%s, %s] mem [%s, %s]\n",
group, cg->cg_cpu.set, cg->cg_cpu.weight, cg->cg_cpu.max,
@@ -925,11 +929,14 @@ static int usage(int rc)
" restart <NAME>[:ID] Restart (stop/start) service by name\n"
" ident [NAME] Show matching identities for NAME, or all\n"
" status <NAME>[:ID] Show service status, by name\n"
" status Show status of services, default command\n"
"\n"
" cgroup List cgroup config overview\n"
" ps List processes based on cgroups\n"
" top Show top-like listing based on cgroups\n"
" status Show status of services, default command\n");
if (cgrp)
fprintf(stderr,
"\n"
" cgroup List cgroup config overview\n"
" ps List processes based on cgroups\n"
" top Show top-like listing based on cgroups\n");
fprintf(stderr,
"\n"
" runlevel [0-9] Show or set runlevel: 0 halt, 6 reboot\n"
" reboot Reboot system\n"
@@ -962,11 +969,22 @@ static int do_help(char *arg)
return usage(0);
}
static int cmd_cond(struct cmd *cmd)
{
if (!cmd || !cmd->cond)
return 1;
return *cmd->cond;
}
static int cmd_parse(int argc, char *argv[], struct cmd *command)
{
int i, j;
for (i = 0; argc > 0 && command[i].cmd; i++) {
if (!cmd_cond(&command[i]))
continue;
if (!string_match(command[i].cmd, argv[0]))
continue;
@@ -991,7 +1009,6 @@ static int cmd_parse(int argc, char *argv[], struct cmd *command)
return command[0].cb(NULL); /* default cmd */
}
int main(int argc, char *argv[])
{
struct option long_options[] = {
@@ -1008,58 +1025,61 @@ int main(int argc, char *argv[])
{ NULL, 0, NULL, 0 }
};
struct cmd cond[] = {
{ "status", NULL, do_cond_show }, /* default cmd */
{ "dump", NULL, do_cond_dump },
{ "set", NULL, do_cond_set },
{ "clr", NULL, do_cond_clr },
{ "clear", NULL, do_cond_clr },
{ NULL, NULL, NULL }
{ "status", NULL, do_cond_show, NULL }, /* default cmd */
{ "dump", NULL, do_cond_dump, NULL },
{ "set", NULL, do_cond_set, NULL },
{ "clr", NULL, do_cond_clr, NULL },
{ "clear", NULL, do_cond_clr, NULL },
{ NULL, NULL, NULL, NULL }
};
struct cmd command[] = {
{ "status", NULL, show_status }, /* default cmd */
{ "ident", NULL, show_ident },
{ "status", NULL, show_status, NULL }, /* default cmd */
{ "ident", NULL, show_ident, NULL },
{ "debug", NULL, toggle_debug },
{ "devel", NULL, do_devel },
{ "help", NULL, do_help },
{ "version", NULL, show_version },
{ "debug", NULL, toggle_debug, NULL },
{ "devel", NULL, do_devel, NULL },
{ "help", NULL, do_help, NULL },
{ "version", NULL, show_version, NULL },
{ "list", NULL, serv_list },
{ "ls", NULL, serv_list },
{ "enable", NULL, serv_enable },
{ "disable", NULL, serv_disable },
{ "touch", NULL, serv_touch },
{ "show", NULL, serv_show },
{ "edit", NULL, serv_edit },
{ "create", NULL, serv_creat },
{ "delete", NULL, serv_delete },
{ "reload", NULL, do_reload },
{ "list", NULL, serv_list, NULL },
{ "ls", NULL, serv_list, NULL },
{ "enable", NULL, serv_enable, NULL },
{ "disable", NULL, serv_disable, NULL },
{ "touch", NULL, serv_touch, NULL },
{ "show", NULL, serv_show, NULL },
{ "edit", NULL, serv_edit, NULL },
{ "create", NULL, serv_creat, NULL },
{ "delete", NULL, serv_delete, NULL },
{ "reload", NULL, do_reload, NULL },
{ "cond", cond, NULL },
{ "cond", cond, NULL, NULL },
{ "log", NULL, do_log },
{ "start", NULL, do_start },
{ "stop", NULL, do_stop },
{ "restart", NULL, do_restart },
{ "log", NULL, do_log, NULL },
{ "start", NULL, do_start, NULL },
{ "stop", NULL, do_stop, NULL },
{ "restart", NULL, do_restart, NULL },
{ "cgroup", NULL, show_cgroup },
{ "ps", NULL, show_cgps },
{ "top", NULL, show_cgtop },
{ "cgroup", NULL, show_cgroup, &cgrp },
{ "ps", NULL, show_cgps, &cgrp },
{ "top", NULL, show_cgtop, &cgrp },
{ "runlevel", NULL, do_runlevel },
{ "reboot", NULL, do_reboot },
{ "halt", NULL, do_halt },
{ "poweroff", NULL, do_poweroff },
{ "suspend", NULL, do_suspend },
{ "runlevel", NULL, do_runlevel, NULL },
{ "reboot", NULL, do_reboot, NULL },
{ "halt", NULL, do_halt, NULL },
{ "poweroff", NULL, do_poweroff, NULL },
{ "suspend", NULL, do_suspend, NULL },
{ "utmp", NULL, do_utmp },
{ NULL, NULL, NULL }
{ "utmp", NULL, do_utmp, NULL },
{ NULL, NULL, NULL, NULL }
};
int interactive = 1, c;
if (transform(progname(argv[0])))
return reboot_main(argc, argv);
/* Enable some functionality if kernel supports cgroups v2 */
cgrp = cgroup_avail();
while ((c = getopt_long(argc, argv, "1bcdfh?pqtv", long_options, NULL)) != EOF) {
switch(c) {
case '1':