/* Copyright (c) 2001-2006, Gerrit Pape All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /* Taken from http://smarden.sunsite.dk/runit/sv.8.html: sv - control and manage services monitored by runsv sv [-v] [-w sec] command services /etc/init.d/service [-w sec] command The sv program reports the current status and controls the state of services monitored by the runsv(8) supervisor. services consists of one or more arguments, each argument naming a directory service used by runsv(8). If service doesn't start with a dot or slash, it is searched in the default services directory /var/service/, otherwise relative to the current directory. command is one of up, down, status, once, pause, cont, hup, alarm, interrupt, 1, 2, term, kill, or exit, or start, stop, restart, shutdown, force-stop, force-reload, force-restart, force-shutdown. The sv program can be sym-linked to /etc/init.d/ to provide an LSB init script interface. The service to be controlled then is specified by the base name of the "init script". status Report the current status of the service, and the appendant log service if available, to standard output. up If the service is not running, start it. If the service stops, restart it. down If the service is running, send it the TERM signal, and the CONT signal. If ./run exits, start ./finish if it exists. After it stops, do not restart service. once If the service is not running, start it. Do not restart it if it stops. pause cont hup alarm interrupt quit 1 2 term kill If the service is running, send it the STOP, CONT, HUP, ALRM, INT, QUIT, USR1, USR2, TERM, or KILL signal respectively. exit If the service is running, send it the TERM signal, and the CONT signal. Do not restart the service. If the service is down, and no log service exists, runsv(8) exits. If the service is down and a log service exists, send the TERM signal to the log service. If the log service is down, runsv(8) exits. This command is ignored if it is given to an appendant log service. sv actually looks only at the first character of above commands. Commands compatible to LSB init script actions: status Same as status. start Same as up, but wait up to 7 seconds for the command to take effect. Then report the status or timeout. If the script ./check exists in the service directory, sv runs this script to check whether the service is up and available; it's considered to be available if ./check exits with 0. stop Same as down, but wait up to 7 seconds for the service to become down. Then report the status or timeout. restart Send the commands term, cont, and up to the service, and wait up to 7 seconds for the service to restart. Then report the status or timeout. If the script ./check exists in the service directory, sv runs this script to check whether the service is up and available again; it's considered to be available if ./check exits with 0. shutdown Same as exit, but wait up to 7 seconds for the runsv(8) process to terminate. Then report the status or timeout. force-stop Same as down, but wait up to 7 seconds for the service to become down. Then report the status, and on timeout send the service the kill command. force-reload Send the service the term and cont commands, and wait up to 7 seconds for the service to restart. Then report the status, and on timeout send the service the kill command. force-restart Send the service the term, cont and up commands, and wait up to 7 seconds for the service to restart. Then report the status, and on timeout send the service the kill command. If the script ./check exists in the service directory, sv runs this script to check whether the service is up and available again; it's considered to be available if ./check exits with 0. force-shutdown Same as exit, but wait up to 7 seconds for the runsv(8) process to terminate. Then report the status, and on timeout send the service the kill command. Additional Commands check Check for the service to be in the state that's been requested. Wait up to 7 seconds for the service to reach the requested state, then report the status or timeout. If the requested state of the service is up, and the script ./check exists in the service directory, sv runs this script to check whether the service is up and running; it's considered to be up if ./check exits with 0. Options -v wait up to 7 seconds for the command to take effect. Then report the status or timeout. -w sec Override the default timeout of 7 seconds with sec seconds. Implies -v. Environment SVDIR The environment variable $SVDIR overrides the default services directory /var/service. SVWAIT The environment variable $SVWAIT overrides the default 7 seconds to wait for a command to take effect. It is overridden by the -w option. Exit Codes sv exits 0, if the command was successfully sent to all services, and, if it was told to wait, the command has taken effect to all services. For each service that caused an error (e.g. the directory is not controlled by a runsv(8) process, or sv timed out while waiting), sv increases the exit code by one and exits non zero. The maximum is 99. sv exits 100 on error. */ /* Busyboxed by Denys Vlasenko <vda.linux@googlemail.com> */ /* TODO: depends on runit_lib.c - review and reduce/eliminate */ #include <sys/poll.h> #include <sys/file.h> #include "libbb.h" #include "runit_lib.h" struct globals { const char *acts; char **service; unsigned rc; /* "Bernstein" time format: unix + 0x400000000000000aULL */ uint64_t tstart, tnow; svstatus_t svstatus; } FIX_ALIASING; #define G (*(struct globals*)&bb_common_bufsiz1) #define acts (G.acts ) #define service (G.service ) #define rc (G.rc ) #define tstart (G.tstart ) #define tnow (G.tnow ) #define svstatus (G.svstatus ) #define INIT_G() do { } while (0) static void fatal_cannot(const char *m1) NORETURN; static void fatal_cannot(const char *m1) { bb_perror_msg("fatal: can't %s", m1); _exit(151); } static void out(const char *p, const char *m1) { printf("%s%s: %s", p, *service, m1); if (errno) { printf(": %s", strerror(errno)); } bb_putchar('\n'); /* will also flush the output */ } #define WARN "warning: " #define OK "ok: " static void fail(const char *m1) { ++rc; out("fail: ", m1); } static void failx(const char *m1) { errno = 0; fail(m1); } static void warn(const char *m1) { ++rc; /* "warning: <service>: <m1>\n" */ out("warning: ", m1); } static void ok(const char *m1) { errno = 0; out(OK, m1); } static int svstatus_get(void) { int fd, r; fd = open_write("supervise/ok"); if (fd == -1) { if (errno == ENODEV) { *acts == 'x' ? ok("runsv not running") : failx("runsv not running"); return 0; } warn("can't open supervise/ok"); return -1; } close(fd); fd = open_read("supervise/status"); if (fd == -1) { warn("can't open supervise/status"); return -1; } r = read(fd, &svstatus, 20); close(fd); switch (r) { case 20: break; case -1: warn("can't read supervise/status"); return -1; default: errno = 0; warn("can't read supervise/status: bad format"); return -1; } return 1; } static unsigned svstatus_print(const char *m) { int diff; int pid; int normallyup = 0; struct stat s; uint64_t timestamp; if (stat("down", &s) == -1) { if (errno != ENOENT) { bb_perror_msg(WARN"can't stat %s/down", *service); return 0; } normallyup = 1; } pid = SWAP_LE32(svstatus.pid_le32); timestamp = SWAP_BE64(svstatus.time_be64); if (pid) { switch (svstatus.run_or_finish) { case 1: printf("run: "); break; case 2: printf("finish: "); break; } printf("%s: (pid %d) ", m, pid); } else { printf("down: %s: ", m); } diff = tnow - timestamp; printf("%us", (diff < 0 ? 0 : diff)); if (pid) { if (!normallyup) printf(", normally down"); if (svstatus.paused) printf(", paused"); if (svstatus.want == 'd') printf(", want down"); if (svstatus.got_term) printf(", got TERM"); } else { if (normallyup) printf(", normally up"); if (svstatus.want == 'u') printf(", want up"); } return pid ? 1 : 2; } static int status(const char *unused UNUSED_PARAM) { int r; if (svstatus_get() <= 0) return 0; r = svstatus_print(*service); if (chdir("log") == -1) { if (errno != ENOENT) { printf("; log: "WARN"can't change to log service directory: %s", strerror(errno)); } } else if (svstatus_get()) { printf("; "); svstatus_print("log"); } bb_putchar('\n'); /* 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"can't stat %s/check", *service); return 0; } /* if (!(s.st_mode & S_IXUSR)) return 1; */ prog[0] = (char*)"./check"; prog[1] = NULL; pid = spawn(prog); if (pid <= 0) { bb_perror_msg(WARN"can't %s child %s/check", "run", *service); return 0; } while (safe_waitpid(pid, &w, 0) == -1) { bb_perror_msg(WARN"can't %s child %s/check", "wait for", *service); return 0; } return WEXITSTATUS(w) == 0; } static int check(const char *a) { int r; unsigned pid_le32; uint64_t timestamp; r = svstatus_get(); if (r == -1) return -1; if (r == 0) { if (*a == 'x') return 1; return -1; } pid_le32 = svstatus.pid_le32; switch (*a) { case 'x': return 0; case 'u': if (!pid_le32 || svstatus.run_or_finish != 1) return 0; if (!checkscript()) return 0; break; case 'd': if (pid_le32) return 0; break; case 'c': if (pid_le32 && !checkscript()) return 0; break; case 't': if (!pid_le32 && svstatus.want == 'd') break; timestamp = SWAP_BE64(svstatus.time_be64); if ((tstart > timestamp) || !pid_le32 || svstatus.got_term || !checkscript()) return 0; break; case 'o': timestamp = SWAP_BE64(svstatus.time_be64); if ((!pid_le32 && tstart > timestamp) || (pid_le32 && svstatus.want != 'd')) return 0; } printf(OK); svstatus_print(*service); bb_putchar('\n'); /* will also flush the output */ return 1; } static int control(const char *a) { int fd, r, l; /* Is it an optimization? It causes problems with "sv o SRV; ...; sv d SRV" ('d' is not passed to SRV because its .want == 'd'): if (svstatus_get() <= 0) return -1; if (svstatus.want == *a) return 0; */ fd = open_write("supervise/control"); if (fd == -1) { if (errno != ENODEV) warn("can't open supervise/control"); else *a == 'x' ? ok("runsv not running") : failx("runsv not running"); return -1; } l = strlen(a); r = write(fd, a, l); close(fd); if (r != l) { warn("can't write to supervise/control"); return -1; } return 1; } int sv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int sv_main(int argc UNUSED_PARAM, char **argv) { unsigned opt; char *x; char *action; const char *varservice = CONFIG_SV_DEFAULT_SERVICE_DIR; unsigned waitsec = 7; smallint kll = 0; int verbose = 0; int (*act)(const char*); int (*cbk)(const char*); int curdir; INIT_G(); xfunc_error_retval = 100; x = getenv("SVDIR"); if (x) varservice = x; x = getenv("SVWAIT"); if (x) waitsec = xatou(x); opt_complementary = "w+:vv"; /* -w N, -v is a counter */ opt = getopt32(argv, "w:v", &waitsec, &verbose); argv += optind; action = *argv++; if (!action || !*argv) bb_show_usage(); tnow = time(NULL) + 0x400000000000000aULL; tstart = tnow; curdir = open_read("."); if (curdir == -1) fatal_cannot("open current directory"); act = &control; acts = "s"; cbk = ✓ switch (*action) { case 'x': case 'e': acts = "x"; if (!verbose) cbk = NULL; break; case 'X': case 'E': acts = "x"; kll = 1; break; case 'D': acts = "d"; kll = 1; break; case 'T': acts = "tc"; kll = 1; break; case 'c': if (str_equal(action, "check")) { act = NULL; acts = "c"; 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; if (!verbose) cbk = NULL; break; case 's': if (str_equal(action, "shutdown")) { acts = "x"; break; } if (str_equal(action, "start")) { acts = "u"; break; } if (str_equal(action, "stop")) { acts = "d"; break; } /* "status" */ act = &status; cbk = NULL; break; case 'r': if (str_equal(action, "restart")) { acts = "tcu"; break; } bb_show_usage(); case 'f': if (str_equal(action, "force-reload")) { acts = "tc"; kll = 1; break; } if (str_equal(action, "force-restart")) { acts = "tcu"; kll = 1; break; } if (str_equal(action, "force-shutdown")) { acts = "x"; kll = 1; break; } if (str_equal(action, "force-stop")) { acts = "d"; kll = 1; break; } default: bb_show_usage(); } service = argv; while ((x = *service) != NULL) { if (x[0] != '/' && x[0] != '.') { if (chdir(varservice) == -1) goto chdir_failed_0; } if (chdir(x) == -1) { chdir_failed_0: fail("can't change to service directory"); goto nullify_service_0; } if (act && (act(acts) == -1)) { nullify_service_0: *service = (char*) -1L; /* "dead" */ } if (fchdir(curdir) == -1) fatal_cannot("change to original directory"); service++; } if (cbk) while (1) { int want_exit; int diff; diff = tnow - tstart; service = argv; want_exit = 1; while ((x = *service) != NULL) { if (x == (char*) -1L) /* "dead" */ goto next; if (x[0] != '/' && x[0] != '.') { if (chdir(varservice) == -1) goto chdir_failed; } if (chdir(x) == -1) { chdir_failed: fail("can't change to service directory"); goto nullify_service; } if (cbk(acts) != 0) goto nullify_service; want_exit = 0; if (diff >= waitsec) { printf(kll ? "kill: " : "timeout: "); if (svstatus_get() > 0) { svstatus_print(x); ++rc; } bb_putchar('\n'); /* will also flush the output */ if (kll) control("k"); nullify_service: *service = (char*) -1L; /* "dead" */ } if (fchdir(curdir) == -1) fatal_cannot("change to original directory"); next: service++; } if (want_exit) break; usleep(420000); tnow = time(NULL) + 0x400000000000000aULL; } return rc > 99 ? 99 : rc; }