From d5ac6072166ea362f314dd91ca4bc2a47841a239 Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Fri, 28 Feb 2020 07:07:40 +0100
Subject: update-me: pass arguments through "su", -u new

---
 update-me.in | 61 ++++++++++++++++++++++++++++++------------------------------
 1 file changed, 31 insertions(+), 30 deletions(-)

diff --git a/update-me.in b/update-me.in
index 4c59d66..c872600 100644
--- a/update-me.in
+++ b/update-me.in
@@ -1,43 +1,41 @@
 #!/bin/bash
 
 usage() {
-  >&2 echo 'usage: update-me [-s|-c]'
+  >&2 echo 'usage: update-me [-s|-c] [-u[ ]$user]'
   >&2 echo '  -s: play it save'
   >&2 echo '  -c: clear for exit'
+  >&2 echo '  -u$user: safety-file should be owned by $user'
   exit 1
 }
 
 play_it_safe=false
 safety_file='/tmp/update-me.do-not-exit'
+flags="$*"
 
-case $# in
-  0)
-  ;;
-  1)
-    case "x$1" in
-      'x-s')
-        play_it_safe=true
-      ;;
-      'x-c')
-        if [ -f "${safety_file}" ] && kill -0 $(cat "${safety_file}"); then
-          rm "${safety_file}"
-          exit 0
-        fi
-        if pgrep -x update-me | grep -vxF $$; then
-          exit 1
-        else
-          exit 2
-        fi
-      ;;
-      *)
-        usage
-      ;;
-    esac
-  ;;
-  *)
-    usage
-  ;;
-esac
+while [ $# -gt 0 ]; do
+  case "x$1" in
+    'x-s')
+      play_it_safe=true
+    ;;
+    'x-c')
+      if [ -f "${safety_file}" ] && kill -0 $(cat "${safety_file}"); then
+        rm "${safety_file}"
+        exit 0
+      fi
+      if pgrep -x update-me | grep -vxF $$; then
+        exit 1
+      else
+        exit 2
+      fi
+    ;;
+    'x-u'*)
+      user="${1#-u}"
+    ;;
+    *)
+      usage
+    ;;
+  esac
+done
 
 preCmds=('hostname')
 cmds=()
@@ -62,6 +60,9 @@ fi
 exit_or_rescue_shell() {
   if "${play_it_safe}"; then
     printf '%s' "$$" >"${safety_file}"
+    if [ -n "${user}" ] && [ "$(whoami)" != "${user}" ]; then
+      chown "${user}" "${safety_file}"
+    fi
     >&2 printf '%s: waiting for clearance ...' "$(hostname)"
     while [ -f "${safety_file}" ] && [ "$(cat "${safety_file}")" = "$$" ]; do
       if read -t 1; then
@@ -97,7 +98,7 @@ if [ ! "$(whoami)" == "root" ]; then
     maxCount=3
     while [ ${err} -eq 1 ] && [ ${maxCount} -gt 0 ]
     do
-      su -c "$(readlink -f "$0") || exit 2"
+      su -c "$(readlink -f "$0") ${flags} || exit 2"
       err=$?
       maxCount=$[${maxCount} - 1]
     done
-- 
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