From f8f42124ba675de10e4085b67c84871f55993941 Mon Sep 17 00:00:00 2001
From: Laurent Bercot <ska-skaware@skarnet.org>
Date: Sat, 7 Mar 2015 19:51:21 +0000
Subject:  Bugfix: s6-setuidgid uid:gid prog syntax wasn't honored

---
 src/daemontools-extras/s6-setuidgid.c | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/src/daemontools-extras/s6-setuidgid.c b/src/daemontools-extras/s6-setuidgid.c
index cc7f21a..30cce8c 100644
--- a/src/daemontools-extras/s6-setuidgid.c
+++ b/src/daemontools-extras/s6-setuidgid.c
@@ -1,5 +1,6 @@
 /* ISC license. */
 
+#include <skalibs/bytestr.h>
 #include <skalibs/strerr2.h>
 #include <skalibs/djbunix.h>
 #include <s6/config.h>
@@ -7,18 +8,35 @@
 #define USAGE "s6-setuidgid username prog..."
 #define dieusage() strerr_dieusage(100, USAGE)
 
-int main (int argc, char const *const *argv, char const *const *envp)
+int main (int argc, char *const *argv, char const *const *envp)
 {
-  char const *newargv[argc + 4] ;
-  unsigned int m = 5 ;
+  char const *newargv[argc + 7] ;
+  unsigned int m = 0 ;
+  unsigned int pos ;
   PROG = "s6-setuidgid" ;
   if (argc < 3) dieusage() ;
   argv++ ;
-  newargv[0] = S6_BINPREFIX "s6-envuidgid" ;
-  newargv[1] = *argv++ ;
-  newargv[2] = S6_BINPREFIX "s6-applyuidgid" ;
-  newargv[3] = "-Uz" ;
-  newargv[4] = "--" ;
+  pos = str_chr(argv[0], ':') ;
+  if (argv[0][pos])
+  {
+    argv[0][pos] = 0 ;
+    newargv[m++] = S6_BINPREFIX "s6-applyuidgid" ;
+    newargv[m++] = "-u" ;
+    newargv[m++] = argv[0] ;
+    newargv[m++] = "-g" ;
+    newargv[m++] = argv[0] + pos + 1 ;
+    newargv[m++] = "-G" ;
+    newargv[m++] = "" ;
+    argv++ ;
+  }
+  else
+  {
+    newargv[m++] = S6_BINPREFIX "s6-envuidgid" ;
+    newargv[m++] = *argv++ ;
+    newargv[m++] = S6_BINPREFIX "s6-applyuidgid" ;
+    newargv[m++] = "-Uz" ;
+  }
+  newargv[m++] = "--" ;
   while (*argv) newargv[m++] = *argv++ ;
   newargv[m++] = 0 ;
   pathexec_run(newargv[0], newargv, envp) ;
-- 
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