From 8a6eaed305dbe4ec6a87fe37000f7461bf563937 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Wed, 18 Jun 2025 18:58:34 +0000
Subject:  Add a lot of stuff, implement basic service_start

Signed-off-by: Laurent Bercot <ska@appnovation.com>
---
 src/s6/service_start.c | 79 ++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 73 insertions(+), 6 deletions(-)

(limited to 'src/s6/service_start.c')

diff --git a/src/s6/service_start.c b/src/s6/service_start.c
index 8e876ea..90a3087 100644
--- a/src/s6/service_start.c
+++ b/src/s6/service_start.c
@@ -1,11 +1,19 @@
 /* ISC license. */
 
+#include <string.h>
+#include <sys/wait.h>
+
+#include <skalibs/posixplz.h>
 #include <skalibs/uint64.h>
+#include <skalibs/types.h>
 #include <skalibs/strerr.h>
 #include <skalibs/gol.h>
 #include <skalibs/env.h>
+#include <skalibs/cspawn.h>
+#include <skalibs/djbunix.h>
 
 #include <s6-rc/config.h>
+#include <s6-rc/s6rc-utils.h>
 
 #include "s6-internal.h"
 
@@ -19,6 +27,12 @@ enum service_start_golb_e
   SERVICE_START_GOLB_N
 } ;
 
+enum service_start_gola_e
+{
+  SERVICE_START_GOLA_TIMEOUT,
+  SERVICE_START_GOLA_N
+} ;
+
 static gol_bool const service_start_golb[3] =
 {
   { .so = 'n', .lo = "dryrun", .set = 1, .mask = 1 << SERVICE_START_GOLB_DRYRUN },
@@ -26,30 +40,83 @@ static gol_bool const service_start_golb[3] =
   { .so = 'w', .lo = "wait", .set = 1, .mask = 1 << SERVICE_START_GOLB_WAIT }
 } ;
 
+static gol_arg const service_start_gola[SERVICE_START_GOLA_N] =
+{
+  { .so = 't', .lo = "timeout", .i = SERVICE_START_GOLA_TIMEOUT }
+} ;
+
 int service_start (char const *const *argv)
 {
-  size_t argc = env_len(argv) ;
+  char const *gola[SERVICE_START_GOLA_N] = { 0 } ;
   uint64_t golb = 0 ;
+  unsigned int t = 0 ;
+  size_t argc = env_len(argv) ;
+  pid_t pid ;
+  int wstat ;
+  uint32_t nlong, nshort, n ;
+  int livelock, compiledlock ;
+  size_t livelen = strlen(g->dirs.live) ;
   PROG = "s6 service start" ;
 
-  argv += gol_argv(argv, service_start_golb, 0, 0, 0, &golb, 0) ;
-  if (!argv) dieusage() ;
+  argv += gol_argv(argv, service_start_golb, 3, service_start_gola, SERVICE_START_GOLA_N, &golb, gola) ;
+  if (!*argv) dieusage() ;
+
+  if (gola[SERVICE_START_GOLA_TIMEOUT])
+  {
+    if (!uint0_scan(gola[SERVICE_START_GOLA_TIMEOUT], &t))
+      strerr_dief1x(100, "timeout must be an integer (milliseconds)") ;
+  }
+  s6f_lock(g->dirs.stmp, 0) ;  /* leaks, it's fine */
+  char dbfn[livelen + 10] ;
+  memcpy(dbfn, g->dirs.live, livelen) ;
+  memcpy(dbfn + livelen, "/compiled", 10) ;
+  if (!s6rc_lock(g->dirs.live, 2, &livelock, dbfn, 1, &compiledlock, 1))
+    strerr_diefu2sys(111, "take lock in ", g->dirs.live) ;
+  if (!s6rc_live_state_size(g->dirs.live, &nlong, &nshort))
+    strerr_diefu2sys(111, "read state size in ", g->dirs.live) ;
+  n = nlong + nshort ;
+  unsigned char oldstate[n] ;
+  if (!s6rc_live_state_read(g->dirs.live, oldstate, n))
+    strerr_diefu2sys(111, "read state in ", g->dirs.live) ;
 
   {
     size_t m = 0 ;
-    char const *newargv[10 + argc] ;
+    char const *newargv[13 + argc] ;
     char fmtv[UINT_FMT] ;
+    char fmtt[UINT_FMT] ;
 
-    newargv[m++] =  S6RC_EXTBINPREFIX "s6-rc" ;
+    newargv[m++] = S6RC_EXTBINPREFIX "s6-rc" ;
+    newargv[m++] = "-X" ;  /* we already took the locks */
     newargv[m++] = "-v" ;
     newargv[m++] = fmtv ;
     fmtv[uint_fmt(fmtv, g->verbosity)] = 0 ;
+    if (t)
+    {
+      newargv[m++] = "-t" ;
+      newargv[m++] = fmtt ;
+      fmtt[uint_fmt(fmtt, t)] = 0 ;
+    }
     if (golb & 1 << SERVICE_START_GOLB_DRYRUN)
     {
       newargv[m++] = "-n" ;
       newargv[m++] = "1" ;
     }
+    newargv[m++] = "-l" ;
+    newargv[m++] = g->dirs.live ;
     newargv[m++] = "--" ;
+    newargv[m++] = "start" ;
+    while (*argv) newargv[m++] = *argv++ ;
+    newargv[m++] = 0 ;
+    pid = cspawn(newargv[0], newargv, (char const *const *)environ, CSPAWN_FLAGS_SIGBLOCKNONE, 0, 0) ;
+    if (!pid) strerr_diefu2sys(111, "spawn ", newargv[0]) ;
   }
-  return 0 ;
+  if (wait_pid(pid, &wstat) <= 0) strerr_diefu1sys(111, "wait for s6-rc") ;
+  if ((WIFEXITED(wstat) && !WEXITSTATUS(wstat)) || !g->verbosity)
+    return wait_estatus(wstat) ;
+
+  unsigned char newstate[n] ;
+  if (!s6rc_live_state_read(g->dirs.live, newstate, n))
+    strerr_diefu2sys(111, "read state in ", g->dirs.live) ;
+  s6f_report_state_change(n, oldstate, newstate, dbfn) ;
+  return wait_estatus(wstat) ;
 }
-- 
cgit v1.3.1