support to switch user by slapos node command

windows/patches/supervisor-cygwin.patch

+diff --git a/options.py~ b/options.py
+old mode 100644
+new mode 100755
+index 3ccab60..e220c10
+--- a/options.py~
++++ b/options.py
+@@ -1197,7 +1197,7 @@ class ServerOptions(Options):
+             return
+ 
+         if current_uid != 0:
+-            return "Can't drop privilege as nonroot user"
++            pass # return "Can't drop privilege as nonroot user"
+ 
+         gid = pwrec[3]
+         if hasattr(os, 'setgroups'):
+@@ -1219,7 +1219,7 @@ class ServerOptions(Options):
+             os.setgid(gid)
+         except OSError:
+             return 'Could not set group id of effective user'
+-        os.setuid(uid)
++        os.setreuid(-1, uid)
+ 
+     def waitpid(self):
+         # need pthread_sigmask here to avoid concurrent sigchild, but

windows/scripts/regpwd.c

+#include <sys/unistd.h>
+#include <sys/cygwin.h>
+#include <stdio.h>
+#include <errno.h>
+
+int main(int argc, char *argv[])
+{
+  const char *username = NULL;
+  const char *newpwd = NULL;
+
+  if (argc == 1 || argc > 3) {
+    fprintf(stderr, "Usage: regpwd username [password]\n");
+    return 1;
+  }
+
+  username = argv[1];
+  if (argc == 3)
+    newpwd = argv[2]; 
+
+  if (!strcmp (username, getlogin ()))
+    username = NULL;
+  
+  if (cygwin_internal (CW_SET_PRIV_KEY, newpwd, username)) {
+    fprintf(stderr, "Storing password failed: %s", strerror (errno));
+    return 1;
+  }
+
+  return 0;
+}

windows/scripts/useradd

@@ -38,6 +38,9 @@
 #   -s
 #     Shell used by user
 #
+#  This script will set password for each new user, the password is
+#  same as the account, and will be saved in the registry.
+#
 export PATH=/usr/local/bin:/usr/bin:/usr/sbin:/sbin:/bin:$PATH
 if ! source /usr/share/csih/cygwin-service-installation-helper.sh ; then
     echo "Error: Download the csih package at first, I need this file:"
@@ -92,8 +95,8 @@ function create_unprivileged_user()
     if [ "${unpriv_user_in_sam}" != "yes" ]
     then
         dos_var_empty=$(/usr/bin/cygpath -w ${2-${LOCALSTATEDIR}/empty})
-        csih_call_winsys32 net user "${unpriv_user}" /add /fullname:"${unpriv_user} nexedi slapos" \
-          "/homedir:${dos_var_empty}" /active:no > /dev/null 2>&1 && unpriv_user_in_sam=yes
+        csih_call_winsys32 net user "${unpriv_user}" "${unpriv_user}" /add \
+            /fullname:"${unpriv_user} Nexedi Slapos" > /dev/null 2>&1 && unpriv_user_in_sam=yes
         if [ "${unpriv_user_in_sam}" != "yes" ]
         then
           csih_warning "Creation of user '${unpriv_user}' failed!"
@@ -194,6 +197,9 @@ fi
 create_unprivileged_user ${USER_NAME} $USER_HOME ||
 (echo "Failed to create user ${USER_NAME}" ; exit 1)
 
+regpwd ${USER_NAME} ${USER_NAME} || 
+(echo "Save ${USER_NAME}'s password failed" ; exit 1)
+
 for grpname in ${USER_INIT_GROUP} ${USER_OTHER_GROUP} ; do
     [[ -z "$grpname" ]] && continue
     add_member_to_group ${USER_NAME} $grpname ||