{"id":16000,"date":"2014-10-24T14:03:32","date_gmt":"2014-10-24T14:03:32","guid":{"rendered":"http:\/\/www.beautifulwork.org\/?p=16000"},"modified":"2014-10-24T14:03:32","modified_gmt":"2014-10-24T14:03:32","slug":"hacking-with-runit-and-sv-commands","status":"publish","type":"post","link":"https:\/\/www.trueangle.org\/index.php\/2014\/10\/24\/hacking-with-runit-and-sv-commands\/","title":{"rendered":"Hacking with runit and sv ( sv – control and manage services monitored by runsv(8) ) commands"},"content":{"rendered":"

ABOUT runit<\/u><\/p>\n

\nrunit is a cross-platform Unix init scheme with service supervision, a replacement for sysvinit, and other init schemes. It runs on GNU\/Linux, *BSD, MacOSX, Solaris, and can easily be adapted to other Unix operating systems\n<\/pre>\n
ABOUT sv<\/u><\/p>\n
\nThe sv program reports the current status and controls the state of services monitored by the runsv(8) supervisor.\nservices consists of one or more arguments, each argument naming a directory service used by runsv(8). If service doesn\u2019t start with a dot or slash and doesn\u2019t end with a slash, it is searched in the default services directory \/service\/, otherwise relative to the current directory.\n<\/pre>\n
A TYPICAL SHELL EXPOSURE<\/u>
\n[bash]
\n$pwd
\n\/etc\/service
\n$ls
\nhello.sh
\n$mkdir new
\nmkdir: cannot create directory \u2018new\u2019: Permission denied
\n$sudo mkdir new
\n$mv hello.sh new\/run
\nmv: cannot move \u2018hello.sh\u2019 to \u2018new\/run\u2019: Permission denied
\n$sudo mv hello.sh new\/run
\n$ls
\nnew
\n$cd new\/
\n$ls
\nrun  supervise
\n$ls -l
\ntotal 8
\n-rw-r–r– 1 root root   11 Oct 24 18:55 run
\ndrwx—— 2 root root 4096 Oct 24 18:57 supervise
\n$cd supervise\/
\nbash: cd: supervise\/: Permission denied
\n$sudo cd supervise\/
\nsudo: cd: command not found
\n$sudo sv start \/etc\/service\/new
\ntimeout: down: \/etc\/service\/new: 1s, normally up, want up
\n$sudo sv status \/etc\/service\/new
\ndown: \/etc\/service\/new: 0s, normally up, want up
\n$sudo sv restart \/etc\/service\/new
\ntimeout: down: \/etc\/service\/new: 0s, normally up, want up
\n$sudo emacs \/etc\/service\/new\/run
\n$sudo sv restart \/etc\/service\/new
\ntimeout: down: \/etc\/service\/new: 0s, normally up, want up
\n$sudo sv stop \/etc\/service\/new
\nok: down: \/etc\/service\/new: 0s, normally up, want up
\n$sudo chmod +x \/etc\/service\/new\/run
\n$sudo sv start \/etc\/service\/new
\ntimeout: down: \/etc\/service\/new: 0s, normally up, want up
\n$sudo sv start \/etc\/service\/new\/
\ntimeout: down: \/etc\/service\/new\/: 1s, normally up, want up
\n$su
\nPassword:
\nroot>sv start \/etc\/service\/new\/
\nrun        run~       supervise\/
\nroot>sv start \/etc\/service\/new\/run
\nfail: \/etc\/service\/new\/run: unable to change to service directory: not a directory
\nroot>sv start \/etc\/service\/new\/
\ntimeout: down: \/etc\/service\/new\/: 1s, normally up, want up
\nroot>exit
\n$echo $?
\n1
\n$sudo sv stop \/etc\/service\/new\/
\nok: down: \/etc\/service\/new\/: 1s, normally up, want up
\n$echo $?
\n0
\n$sudo runit
\n– runit: fatal: must be run as process no 1.
\n$sudo runit enable
\n– runit: fatal: must be run as process no 1.
\n$<\/p>\n
[\/bash]
\nTYPICAL SOURCE CODE EXPOSURE<\/u>
\n[c]<\/p>\n
int main(int argc, char **argv) {
\n  unsigned int i, done;
\n  char *x;<\/p>\n
  progname =*argv;
\n  for (i =str_len(*argv); i; –i) if ((*argv)[i -1] == ‘\/’) break;
\n  *argv +=i;
\n  optprogname =progname =*argv;
\n  service =argv;
\n  services =1;
\n  lsb =(str_diff(progname, "sv"));
\n  if ((x =env_get("SVDIR"))) varservice =x;
\n  if ((x =env_get("SVWAIT"))) scan_ulong(x, &wait);
\n  while ((i =getopt(argc, (const char* const*)argv, "w:vV")) != opteof) {
\n    switch(i) {
\n    case ‘w’: scan_ulong(optarg, &wait);
\n    case ‘v’: verbose =1; break;
\n    case ‘V’: strerr_warn1(VERSION, 0);
\n    case ‘?’: usage();
\n    }
\n  }
\n  argv +=optind; argc -=optind;
\n  if (!(action =*argv++)) usage(); –argc;
\n  if (!lsb) { service =argv; services =argc; }
\n  if (!*service) usage();<\/p>\n
  taia_now(&tnow); tstart =tnow;
\n  if ((curdir =open_read(".")) == -1)
\n    fatal("unable to open current directory");<\/p>\n
  act =&control; acts ="s";
\n  if (verbose) cbk =&check;
\n  switch (*action) {
\n  case ‘x’: case ‘e’:
\n    acts ="x"; break;
\n  case ‘X’: case ‘E’:
\n    acts ="x"; kll =1; cbk =&check; break;
\n  case ‘D’:
\n    acts ="d"; kll =1; cbk =&check; break;
\n  case ‘T’:
\n    acts ="tc"; kll =1; cbk =&check; break;
\n  case ‘t’:
\n    if (!str_diff(action, "try-restart")) { acts ="tc"; cbk =&check; break; }
\n  case ‘c’:
\n    if (!str_diff(action, "check")) { act =0; acts ="C"; cbk =&check; break; }
\n  case ‘u’: case ‘d’: case ‘o’: case ‘p’: case ‘h’:
\n  case ‘a’: case ‘i’: case ‘k’: case ‘q’: case ‘1’: case ‘2’:
\n    action[1] =0; acts =action; break;
\n  case ‘s’:
\n    if (!str_diff(action, "shutdown")) { acts ="x"; cbk =&check; break; }
\n    if (!str_diff(action, "start")) { acts ="u"; cbk =&check; break; }
\n    if (!str_diff(action, "stop")) { acts ="d"; cbk =&check; break; }
\n    if (lsb && str_diff(action, "status")) usage();
\n    act =&status; cbk =0; break;
\n  case ‘r’:
\n    if (!str_diff(action, "restart")) { acts ="tcu"; cbk =&check; break; }
\n    if (!str_diff(action, "reload")) { acts ="h"; cbk =&check; break; }
\n    usage();
\n  case ‘f’:
\n    if (!str_diff(action, "force-reload"))
\n      { acts ="tc"; kll =1; cbk =&check; break; }
\n    if (!str_diff(action, "force-restart"))
\n      { acts ="tcu"; kll =1; cbk =&check; break; }
\n    if (!str_diff(action, "force-shutdown"))
\n      { acts ="x"; kll =1; cbk =&check; break; }
\n    if (!str_diff(action, "force-stop"))
\n      { acts ="d"; kll =1; cbk =&check; break; }
\n  default:
\n    usage();
\n  }<\/p>\n
  servicex =service;
\n  for (i =0; i < services; ++i) {
\n    if ((**service != ‘\/’) && (**service != ‘.’) && **service &&
\n        ((*service)[str_len(*service) -1] != ‘\/’)) {
\n      if ((chdir(varservice) == -1) || (chdir(*service) == -1)) {
\n        fail("unable to change to service directory");
\n        *service =0;
\n      }
\n    }
\n    else
\n      if (chdir(*service) == -1) {
\n        fail("unable to change to service directory");
\n        *service =0;
\n      }
\n    if (*service) if (act && (act(acts) == -1)) *service =0;
\n    if (fchdir(curdir) == -1) fatal("unable to change to original directory");
\n    service++;
\n  }<\/p>\n
[\/c]<\/p>\n
SOURCE CODE TAKEN FROM DEBIAN SOURCE PACKAGE NAMED runit<\/p>\n
RELATED LINKS
\nhttp:\/\/smarden.org\/runit\/<\/a>
\nhttp:\/\/smarden.org\/runit\/sv.8.html<\/a>
\nhttps:\/\/en.wikipedia.org\/wiki\/Runit<\/a>
\nhttps:\/\/docs.ansible.com\/ansible\/2.5\/modules\/runit_module.html<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
ABOUT runit runit is a cross-platform Unix init scheme with service supervision, a replacement for sysvinit, and other init schemes. It runs on GNU\/Linux, *BSD, MacOSX, Solaris, and can easily be adapted to other Unix operating systems ABOUT sv The sv program reports the current status and controls the state of services monitored by the … <\/p>\n
Continue reading “Hacking with runit and sv (  sv – control and manage services monitored by runsv(8)  ) commands”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[7,83,91],"tags":[1403,1624],"_links":{"self":[{"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/posts\/16000"}],"collection":[{"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/comments?post=16000"}],"version-history":[{"count":0,"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/posts\/16000\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/media?parent=16000"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/categories?post=16000"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.trueangle.org\/index.php\/wp-json\/wp\/v2\/tags?post=16000"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}