Add instances implementation (still needs testing)

Signed-off-by: Laurent Bercot <ska@appnovation.com>

1 files changed, 79 insertions, 0 deletions

diff --git a/src/instance/s6-instance-control.c b/src/instance/s6-instance-control.c
new file mode 100644
index 0000000..899ab89
--- /dev/null
+++ b/src/instance/s6-instance-control.c
@@ -0,0 +1,79 @@
+/* ISC license. */
+
+#include <string.h>
+
+#include <skalibs/bytestr.h>
+#include <skalibs/types.h>
+#include <skalibs/strerr.h>
+#include <skalibs/sgetopt.h>
+#include <skalibs/exec.h>
+
+#include <s6/config.h>
+
+#define USAGE "s6-instance-control [ -wu | -wU | -wd | -wD | -wr | -wR ] [ -T timeout ] [ -abqhkti12pcyroduDUxOX ] service instance"
+#define dieusage() strerr_dieusage(100, USAGE)
+
+#define DATASIZE 63
+
+int main (int argc, char const **argv)
+{
+  char const **fullargv = argv ;
+  size_t namelen ;
+  PROG = "s6-instance-control" ;
+
+  {
+    subgetopt l = SUBGETOPT_ZERO ;
+    unsigned int datalen = 1 ;
+    unsigned int timeout = 0 ;
+    for (;;)
+    {
+      int opt = subgetopt_r(argc, argv, "abqhkti12pcyroduxOT:w:", &l) ;
+      if (opt == -1) break ;
+      switch (opt)
+      {
+        case 'a' :
+        case 'b' :
+        case 'q' :
+        case 'h' :
+        case 'k' :
+        case 't' :
+        case 'i' :
+        case '1' :
+        case '2' :
+        case 'p' :
+        case 'c' :
+        case 'y' :
+        case 'r' :
+        case 'o' :
+        case 'd' :
+        case 'u' :
+        case 'D' :
+        case 'U' :
+        case 'x' :
+        case 'O' : if (datalen++ >= DATASIZE) strerr_dief1x(100, "too many commands") ; break ;
+        case 'T' : if (!uint0_scan(l.arg, &timeout)) dieusage() ; break ;
+        case 'w' : if (!memchr("dDuUrR", l.arg[0], 6)) dieusage() ; break ;
+        default : dieusage() ;
+      }
+    }
+    argc -= l.ind ; argv += l.ind ;
+  }
+
+  if (argc < 2) dieusage() ;
+  namelen = strlen(argv[1]) ;
+  if (!argv[0][0]) strerr_dief1x(100, "invalid service name") ;
+  if (!argv[1][0] || argv[1][0] == '.' || byte_in(argv[1], namelen, " \t\f\r\n", 5) < 5)
+    strerr_dief1x(100, "invalid instance name") ;
+
+  {
+    size_t svlen = strlen(argv[0]) ;
+    char fn[svlen + 11 + namelen] ;
+    memcpy(fn, argv[0], svlen) ;
+    memcpy(fn + svlen, "/instance/", 10) ;
+    memcpy(fn + svlen + 10, argv[1], namelen + 1) ;
+    argv[0] = fn ;
+    argv[1] = 0 ;
+    fullargv[0] = S6_BINPREFIX "s6-svc" ;
+    xexec(fullargv) ;
+  }
+}