1 files changed, 97 insertions, 0 deletions
diff --git a/src/instance/s6-instance-create.c b/src/instance/s6-instance-create.c
new file mode 100644
index 0000000..2e97618
--- /dev/null
+++ b/src/instance/s6-instance-create.c
@@ -0,0 +1,97 @@
+/* ISC license. */
+
+#include <errno.h>
+#include <stdint.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <skalibs/bytestr.h>
+#include <skalibs/types.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/tai.h>
+#include <skalibs/strerr.h>
+#include <skalibs/stralloc.h>
+#include <skalibs/djbunix.h>
+
+#include <s6/supervise.h>
+
+#define USAGE "s6-instance-create [ -d | -D ] [ -f ] [ -P ] [ -t timeout ] service instancename"
+#define dieusage() strerr_dieusage(100, USAGE)
+
+static inline void checkinstanced (char const *s)  /* chdirs */
+{
+  int fd, r ;
+  size_t len = strlen(s) ;
+  char fn[len + 10] ;
+  memcpy(fn, s, len) ;
+  memcpy(fn + len, "/instance", 10) ;
+  if (chdir(fn) == -1) strerr_diefu2sys(111, "chdir to ", fn) ;
+  fd = open_read(S6_SVSCAN_CTLDIR "/lock") ;
+  if (fd < 0) strerr_diefu3sys(111, "open ", fn, "/" S6_SVSCAN_CTLDIR "/lock") ;
+  r = fd_islocked(fd) ;
+  if (r < 0) strerr_diefu3sys(111, "check lock on ", fn, "/" S6_SVSCAN_CTLDIR "/lock") ;
+  if (!r) strerr_dief2x(1, "instanced service not running on ", s) ;
+  fd_close(fd) ;
+}
+
+static void cleanup (char const *s)
+{
+  int e = errno ;
+  rm_rf(s) ;
+  errno = e ;
+}
+
+int main (int argc, char const *const *argv)
+{
+  tain tto = TAIN_INFINITE_RELATIVE ;
+  size_t namelen ;
+  uint32_t options = 16 ;
+  PROG = "s6-instance-create" ;
+  {
+    unsigned int t = 0 ;
+    subgetopt l = SUBGETOPT_ZERO ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "dDfPt:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'd' : options |= 12 ; break ;
+        case 'D' : options |= 4 ; options &= ~8U ; break ;
+        case 'f' : options |= 1 ; break ;
+        case 'P' : options |= 2 ; break ;
+        case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+    if (t) tain_from_millisecs(&tto, t) ;
+  }
+  if (argc < 2) dieusage() ;
+
+  namelen = strlen(argv[1]) ;
+  if (!argv[0][0]) strerr_dief1x(100, "invalid service path") ;
+  if (!argv[1][0] || argv[1][0] == '.' || byte_in(argv[1], namelen, " \t\f\r\n", 5) < 5)
+    strerr_dief1x(100, "invalid instance name") ;
+  checkinstanced(argv[0]) ;
+
+  tain_now_set_stopwatch_g() ;
+  tain_add_g(&tto, &tto) ;
+
+  {
+    char sv[namelen + 14] ;
+    memcpy(sv, "../instances/", 13) ;
+    memcpy(sv + 13, argv[1], namelen + 1) ;
+    if (!hiercopy("../instances/.template", sv))
+    {
+      cleanup(sv) ;
+      strerr_diefu5sys(111, "copy ", argv[0], "/instances/.template to ", argv[0], sv+2) ;
+    }
+    if (s6_supervise_link_names_g(".", (char const *const *)&sv, argv + 1, 1, options, &tto) == -1)
+    {
+      cleanup(sv) ;
+      strerr_diefu4sys(errno == ETIMEDOUT ? 99 : 111, "creatre instance of ", argv[0], " named ", argv[1]) ;
+    }
+  }
+  return 0 ;
+}