s6

Mirror/fork of https://skarnet.org/software/s6/
git clone https://ccx.te2000.cz/git/s6
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s6-instance-create.c (2882B)

      1 /* ISC license. */
      2 
      3 #include <errno.h>
      4 #include <stdint.h>
      5 #include <string.h>
      6 #include <sys/stat.h>
      7 
      8 #include <skalibs/bytestr.h>
      9 #include <skalibs/types.h>
     10 #include <skalibs/sgetopt.h>
     11 #include <skalibs/tai.h>
     12 #include <skalibs/strerr.h>
     13 #include <skalibs/djbunix.h>
     14 
     15 #include <s6/supervise.h>
     16 
     17 #define USAGE "s6-instance-create [ -d | -D ] [ -f ] [ -P ] [ -t timeout ] service instancename"
     18 #define dieusage() strerr_dieusage(100, USAGE)
     19 
     20 static void cleanup (char const *s)
     21 {
     22   int e = errno ;
     23   rm_rf(s) ;
     24   errno = e ;
     25 }
     26 
     27 int main (int argc, char const *const *argv)
     28 {
     29   tain tto = TAIN_INFINITE_RELATIVE ;
     30   size_t namelen ;
     31   uint32_t options = 16 ;
     32   PROG = "s6-instance-create" ;
     33   {
     34     unsigned int t = 0 ;
     35     subgetopt l = SUBGETOPT_ZERO ;
     36     for (;;)
     37     {
     38       int opt = subgetopt_r(argc, argv, "dDfPt:", &l) ;
     39       if (opt == -1) break ;
     40       switch (opt)
     41       {
     42         case 'd' : options |= 12 ; break ;
     43         case 'D' : options |= 4 ; options &= ~8U ; break ;
     44         case 'f' : options |= 1 ; break ;
     45         case 'P' : options |= 2 ; break ;
     46         case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
     47         default : dieusage() ;
     48       }
     49     }
     50     argc -= l.ind ; argv += l.ind ;
     51     if (t) tain_from_millisecs(&tto, t) ;
     52   }
     53   if (argc < 2) dieusage() ;
     54 
     55   namelen = strlen(argv[1]) ;
     56   if (!argv[1][0] || argv[1][0] == '.' || byte_in(argv[1], namelen, " \t\f\r\n", 5) < namelen)
     57     strerr_dief1x(100, "invalid instance name") ;
     58 
     59   {
     60     mode_t m = umask(0) ;
     61     size_t svlen = strlen(argv[0]) ;
     62     char fn[svlen + 11] ;
     63     memcpy(fn, argv[0], svlen) ;
     64     memcpy(fn + svlen, "/instances", 11) ;
     65     if (mkdir(fn, 0755) == -1 && errno != EEXIST)
     66       strerr_diefu2sys(111, "mkdir ", fn) ;
     67     fn[svlen + 9] = 0 ;
     68     if (mkdir(fn, 0755) == -1 && errno != EEXIST)
     69       strerr_diefu2sys(111, "mkdir ", fn) ;
     70     umask(m) ;
     71   }
     72 
     73   s6_instance_chdirservice(argv[0]) ;
     74 
     75   tain_now_set_stopwatch_g() ;
     76   tain_add_g(&tto, &tto) ;
     77 
     78   {
     79     char sv[namelen + 14] ;
     80     char const *p = sv ;
     81     memcpy(sv, "../instances/", 13) ;
     82     memcpy(sv + 13, argv[1], namelen + 1) ;
     83     {
     84       struct stat st ;
     85       if (stat(sv, &st) == 0)
     86         if (!S_ISDIR(st.st_mode))
     87           strerr_dief3x(100, "unexpected file preventing instance creation at ", argv[0], sv+2) ;
     88         else
     89           strerr_dief3x(100, "instance appears to already exist at ", argv[0], sv+2) ;
     90       else if (errno != ENOENT)
     91         strerr_diefu3sys(111, "stat ", argv[0], sv+2) ;
     92     }
     93     if (!hiercopy("../template", sv))
     94     {
     95       cleanup(sv) ;
     96       strerr_diefu5sys(111, "copy ", argv[0], "/template to ", argv[0], sv+2) ;
     97     }
     98     if (s6_supervise_link_names_g(".", &p, argv + 1, 1, options, &tto) == -1)
     99     {
    100       cleanup(sv) ;
    101       strerr_diefu4sys(errno == ETIMEDOUT ? 99 : 111, "create instance of ", argv[0], " named ", argv[1]) ;
    102     }
    103   }
    104   return 0 ;
    105 }