1 files changed, 44 insertions, 0 deletions
diff --git a/src/daemontools-extras/s6-envuidgid.c b/src/daemontools-extras/s6-envuidgid.c
new file mode 100644
index 0000000..64521b0
--- /dev/null
+++ b/src/daemontools-extras/s6-envuidgid.c
@@ -0,0 +1,44 @@
+/* ISC license. */
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <limits.h>
+#include <skalibs/gidstuff.h>
+#include <skalibs/env.h>
+#include <skalibs/strerr2.h>
+#include <skalibs/fmtscan.h>
+#include <skalibs/djbunix.h>
+
+#define USAGE "s6-envuidgid username prog..."
+
+int main (int argc, char const *const *argv, char const *const *envp)
+{
+  PROG = "s6-envuidgid" ;
+  if (argc < 3) strerr_dieusage(100, USAGE) ;
+  {
+    char fmt[UINT64_FMT] ;
+    struct passwd *pw = getpwnam(argv[1]) ;
+    if (!pw) strerr_dief2x(1, "unknown user: ", argv[1]) ;
+    fmt[gid_fmt(fmt, pw->pw_gid)] = 0 ;
+    if (!pathexec_env("GID", fmt))
+      strerr_diefu1sys(111, "update environment") ;
+    fmt[uint64_fmt(fmt, pw->pw_uid)] = 0 ;
+    if (!pathexec_env("UID", fmt))
+      strerr_diefu1sys(111, "update environment") ;
+  }
+  
+  {
+    gid_t tab[NGROUPS_MAX] ;
+    int n = prot_readgroups(argv[1], tab, NGROUPS_MAX) ;
+    if (n < 0)
+      strerr_diefu2sys(111, "get supplementary groups for ", argv[1]) ;
+    {
+      char fmt[GID_FMT * n] ;
+      fmt[gid_fmtlist(fmt, tab, n)] = 0 ;
+      if (!pathexec_env("GIDLIST", fmt))
+        strerr_diefu1sys(111, "update environment") ;
+    }
+  }
+  pathexec_fromenv(argv+2, envp, env_len(envp)) ;
+  strerr_dieexec(111, argv[2]) ;
+}