hush/runit/sv.c

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/* Busyboxed by Denis Vlasenko <vda.linux@googlemail.com> */
/* TODO: depends on runit_lib.c - review and reduce/eliminate */
#include <sys/poll.h>
#include <sys/file.h>
#include "busybox.h"
#include "runit_lib.h"
static char *action;
static const char *acts;
static const char *varservice = "/var/service/";
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static char **service;
static char **servicex;
static unsigned services;
static unsigned rc;
static unsigned verbose;
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static unsigned long waitsec = 7;
static unsigned kll;
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static struct taia tstart, tnow, tdiff;
static struct tai tstatus;
static int (*act)(const char*);
static int (*cbk)(const char*);
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static int curdir, fd, r;
static char svstatus[20];
#define usage() bb_show_usage()
static void fatal_cannot(const char *m1)
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{
bb_perror_msg("fatal: cannot %s", m1);
_exit(151);
}
static void out(const char *p, const char *m1)
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{
printf("%s%s: %s", p, *service, m1);
if (errno) {
printf(": %s", strerror(errno));
}
puts(""); /* will also flush the output */
}
#define FAIL "fail: "
#define WARN "warning: "
#define OK "ok: "
#define RUN "run: "
#define FINISH "finish: "
#define DOWN "down: "
#define TIMEOUT "timeout: "
#define KILL "kill: "
static void fail(const char *m1) { ++rc; out(FAIL, m1); }
static void failx(const char *m1) { errno = 0; fail(m1); }
static void warn_cannot(const char *m1) { ++rc; out("warning: cannot ", m1); }
static void warnx_cannot(const char *m1) { errno = 0; warn_cannot(m1); }
static void ok(const char *m1) { errno = 0; out(OK, m1); }
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static int svstatus_get(void)
{
fd = open_write("supervise/ok");
if (fd == -1) {
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if (errno == ENODEV) {
*acts == 'x' ? ok("runsv not running")
: failx("runsv not running");
return 0;
}
warn_cannot("open supervise/ok");
return -1;
}
close(fd);
fd = open_read("supervise/status");
if (fd == -1) {
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warn_cannot("open supervise/status");
return -1;
}
r = read(fd, svstatus, 20);
close(fd);
switch (r) {
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case 20: break;
case -1: warn_cannot("read supervise/status"); return -1;
default: warnx_cannot("read supervise/status: bad format"); return -1;
}
return 1;
}
static unsigned svstatus_print(const char *m)
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{
int pid;
int normallyup = 0;
struct stat s;
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if (stat("down", &s) == -1) {
if (errno != ENOENT) {
bb_perror_msg(WARN"cannot stat %s/down", *service);
return 0;
}
normallyup = 1;
}
pid = (unsigned char) svstatus[15];
pid <<= 8; pid += (unsigned char)svstatus[14];
pid <<= 8; pid += (unsigned char)svstatus[13];
pid <<= 8; pid += (unsigned char)svstatus[12];
tai_unpack(svstatus, &tstatus);
if (pid) {
switch (svstatus[19]) {
case 1: printf(RUN); break;
case 2: printf(FINISH); break;
}
printf("%s: (pid %d) ", m, pid);
}
else {
printf(DOWN"%s: ", m);
}
printf("%lus", (unsigned long)(tnow.sec.x < tstatus.x ? 0 : tnow.sec.x-tstatus.x));
if (pid && !normallyup) printf(", normally down");
if (!pid && normallyup) printf(", normally up");
if (pid && svstatus[16]) printf(", paused");
if (!pid && (svstatus[17] == 'u')) printf(", want up");
if (pid && (svstatus[17] == 'd')) printf(", want down");
if (pid && svstatus[18]) printf(", got TERM");
return pid ? 1 : 2;
}
static int status(const char *unused)
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{
r = svstatus_get();
switch (r) { case -1: case 0: return 0; }
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r = svstatus_print(*service);
if (chdir("log") == -1) {
if (errno != ENOENT) {
printf("; log: "WARN"cannot change to log service directory: %s",
strerror(errno));
}
} else if (svstatus_get()) {
printf("; ");
svstatus_print("log");
}
puts(""); /* will also flush the output */
return r;
}
static int checkscript(void)
{
char *prog[2];
struct stat s;
int pid, w;
if (stat("check", &s) == -1) {
if (errno == ENOENT) return 1;
bb_perror_msg(WARN"cannot stat %s/check", *service);
return 0;
}
/* if (!(s.st_mode & S_IXUSR)) return 1; */
if ((pid = fork()) == -1) {
bb_perror_msg(WARN"cannot fork for %s/check", *service);
return 0;
}
if (!pid) {
prog[0] = (char*)"./check";
prog[1] = NULL;
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close(1);
execve("check", prog, environ);
bb_perror_msg(WARN"cannot run %s/check", *service);
_exit(0);
}
while (wait_pid(&w, pid) == -1) {
if (errno == EINTR) continue;
bb_perror_msg(WARN"cannot wait for child %s/check", *service);
return 0;
}
return !wait_exitcode(w);
}
static int check(const char *a)
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{
unsigned pid;
if ((r = svstatus_get()) == -1) return -1;
if (r == 0) { if (*a == 'x') return 1; return -1; }
pid = (unsigned char)svstatus[15];
pid <<= 8; pid += (unsigned char)svstatus[14];
pid <<= 8; pid += (unsigned char)svstatus[13];
pid <<= 8; pid += (unsigned char)svstatus[12];
switch (*a) {
case 'x': return 0;
case 'u':
if (!pid || svstatus[19] != 1) return 0;
if (!checkscript()) return 0;
break;
case 'd': if (pid) return 0; break;
case 'c': if (pid) if (!checkscript()) return 0; break;
case 't':
if (!pid && svstatus[17] == 'd') break;
tai_unpack(svstatus, &tstatus);
if ((tstart.sec.x > tstatus.x) || !pid || svstatus[18] || !checkscript())
return 0;
break;
case 'o':
tai_unpack(svstatus, &tstatus);
if ((!pid && tstart.sec.x > tstatus.x) || (pid && svstatus[17] != 'd'))
return 0;
}
printf(OK);
svstatus_print(*service);
puts(""); /* will also flush the output */
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return 1;
}
static int control(const char *a)
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{
if (svstatus_get() <= 0) return -1;
if (svstatus[17] == *a) return 0;
fd = open_write("supervise/control");
if (fd == -1) {
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if (errno != ENODEV)
warn_cannot("open supervise/control");
else
*a == 'x' ? ok("runsv not running") : failx("runsv not running");
return -1;
}
r = write(fd, a, strlen(a));
close(fd);
if (r != strlen(a)) {
warn_cannot("write to supervise/control");
return -1;
}
return 1;
}
int sv_main(int argc, char **argv)
{
unsigned opt;
unsigned i, want_exit;
char *x;
for (i = strlen(*argv); i; --i)
if ((*argv)[i-1] == '/')
break;
*argv += i;
service = argv;
services = 1;
if ((x = getenv("SVDIR"))) varservice = x;
if ((x = getenv("SVWAIT"))) waitsec = xatoul(x);
/* TODO: V can be handled internally by getopt_ulflags */
opt = getopt32(argc, argv, "w:vV", &x);
if (opt & 1) waitsec = xatoul(x);
if (opt & 2) verbose = 1;
if (opt & 4) usage();
if (!(action = *argv++)) usage();
--argc;
service = argv;
services = argc;
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if (!*service) usage();
taia_now(&tnow);
tstart = tnow;
curdir = open_read(".");
if (curdir == -1)
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fatal_cannot("open current directory");
act = &control;
acts = "s";
if (verbose)
cbk = &check;
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switch (*action) {
case 'x': case 'e':
acts = "x"; break;
case 'X': case 'E':
acts = "x"; kll = 1; cbk = &check; break;
case 'D':
acts = "d"; kll = 1; cbk = &check; break;
case 'T':
acts = "tc"; kll = 1; cbk = &check; break;
case 'c':
if (!str_diff(action, "check")) {
act = 0;
acts = "c";
cbk = &check;
break;
}
case 'u': case 'd': case 'o': case 't': case 'p': case 'h':
case 'a': case 'i': case 'k': case 'q': case '1': case '2':
action[1] = 0; acts = action; break;
case 's':
if (!str_diff(action, "shutdown")) {
acts = "x";
cbk = &check;
break;
}
if (!str_diff(action, "start")) {
acts = "u";
cbk = &check;
break;
}
if (!str_diff(action, "stop")) {
acts = "d";
cbk = &check;
break;
}
act = &status;
cbk = NULL;
break;
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case 'r':
if (!str_diff(action, "restart")) {
acts = "tcu";
cbk = &check;
break;
}
usage();
case 'f':
if (!str_diff(action, "force-reload"))
{ acts = "tc"; kll = 1; cbk = &check; break; }
if (!str_diff(action, "force-restart"))
{ acts = "tcu"; kll = 1; cbk = &check; break; }
if (!str_diff(action, "force-shutdown"))
{ acts = "x"; kll = 1; cbk = &check; break; }
if (!str_diff(action, "force-stop"))
{ acts = "d"; kll = 1; cbk = &check; break; }
default:
usage();
}
servicex = service;
for (i = 0; i < services; ++i) {
if ((**service != '/') && (**service != '.')) {
if ((chdir(varservice) == -1) || (chdir(*service) == -1)) {
fail("cannot change to service directory");
*service = 0;
}
} else if (chdir(*service) == -1) {
fail("cannot change to service directory");
*service = 0;
}
if (*service) if (act && (act(acts) == -1)) *service = 0;
if (fchdir(curdir) == -1) fatal_cannot("change to original directory");
service++;
}
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if (*cbk) {
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for (;;) {
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//TODO: tdiff resolution is way too high. seconds will be enough
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taia_sub(&tdiff, &tnow, &tstart);
service = servicex; want_exit = 1;
for (i = 0; i < services; ++i, ++service) {
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if (!*service)
continue;
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if ((**service != '/') && (**service != '.')) {
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if (chdir(varservice) == -1)
goto chdir_failed;
}
if (chdir(*service) == -1) {
chdir_failed:
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fail("cannot change to service directory");
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goto nullify_service;
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}
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if (cbk(acts) != 0)
goto nullify_service;
want_exit = 0;
//if (taia_approx(&tdiff) > waitsec)
if (tdiff.sec.x >= waitsec) {
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kll ? printf(KILL) : printf(TIMEOUT);
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if (svstatus_get() > 0) {
svstatus_print(*service);
++rc;
}
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puts(""); /* will also flush the output */
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if (kll)
control("k");
nullify_service:
*service = NULL;
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}
if (fchdir(curdir) == -1)
fatal_cannot("change to original directory");
}
if (want_exit) break;
usleep(420000);
taia_now(&tnow);
}
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}
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return rc > 99 ? 99 : rc;
}