Export SCREENRC in become.

[profile.git] / opt / bin / become

diff --git a/opt/bin/become b/opt/bin/become
index cfc498e..d958646 100755 (executable)
--- a/opt/bin/become
+++ b/opt/bin/become
@@ -1,9 +1,11 @@
 #!/bin/bash
 
+chdir=0
 kerberos=0
 x11=0
 while getopts ":kx" opt; do
   case $opt in
+    c) chdir=1;;
     k) kerberos=1;;
     x) x11=1;;
   esac
@@ -12,8 +14,9 @@ shift $((OPTIND-1))
 
 user="$1"; shift
 if [ -z "$user" ]; then
-  echo >&2 "Usage: become [-k] [-x] <user>"
-  echo >&2 "Options: -k   Delegate Kerberos credentials even if target user is not root."
+  echo >&2 "Usage: become [-c] [-k] [-x] <user>"
+  echo >&2 "Options: -c   Stay in current directory even if target user is not root."
+  echo >&2 "         -k   Delegate Kerberos credentials even if target user is not root."
   echo >&2 "         -x   Delegate X11 cookie even if target user is not root."
   exit 1
 fi
@@ -25,6 +28,7 @@ if [ -z "$uid" ]; then
 fi
 
 if [ $uid = 0 ]; then
+  chdir=1
   kerberos=1
   x11=1
 fi
@@ -33,23 +37,41 @@ PRINCIPAL=$(klist 2>/dev/null | sed -n 's/^Default principal: //p')
 if [ $x11 = 1 -a -n "$DISPLAY" -a "${DISPLAY##localhost:}" = "$DISPLAY" ]; then
   COOKIE="$(xauth list $DISPLAY)"
 fi
-BECOME="$HOME/.become"
-profile="$BECOME/$user"
-[ -f "$profile" ] || profile="$BECOME/all"
+ignore_profile_user=0
+for candidate in "$HOME" "$PROFILE_HOME"; do
+  [ -n "$candidate" ] || continue
+  BECOME="$candidate/.become"
+  [ -d "$BECOME" ] || continue
 
-file="$(mktemp)"
-if [ -n "$file" ]; then
-  exec 3>"$file"
-  exec <"$file"
-  rm "$file"
+  # Script to run when becoming any user.
+  [ -z "$allusersprofile" ] && allusersprofile="$BECOME/all"
+  [ -f "$allusersprofile" ] || allusersprofile=
 
+  # Set $HOME/all sticky to ignore $PROFILE_HOME/$user.
+  if [ "$candidate" = "$HOME" ]; then
+    [ -k "$BECOME/all" ] && ignore_profile_user=1
+  else
+    [ $ignore_profile_user = 1 ] && continue
+  fi
+
+  # Script to run (after the one mentioned above) when becoming this user.
+  [ -z "$userprofile" ] && userprofile="$BECOME/$user"
+  [ -f "$userprofile" ] || userprofile=
+done
+
+file="${TMPDIR:-/tmp}/$USER.become.$user.$RANDOM.$$"
+umask=$(builtin umask -p)
+builtin umask 077
+if exec 3>"$file" && exec <"$file" && rm "$file"; then
+  builtin $umask
   echo >&3 "cd"
-  echo >&3 "PROFILE_HOME='$HOME'"
+  echo >&3 "PROFILE_HOME='${PROFILE_HOME:-$HOME}'"
   if [ -n "$PRINCIPAL" ]; then
     echo >&3 "PRINCIPAL='$PRINCIPAL'"
     if [ $kerberos = 1 ]; then
-      ccname=$(klist 2>/dev/null | sed -n 's/^Ticket cache: FILE://p')
+      ccname=$(klist 2>/dev/null | sed -n 's/^Ticket cache: [DF]I[LR][E:]://p')
       if [ -f "$ccname" ]; then
+        echo >&3 "export KRB5CCNAME='$KRB5CCNAME'"
         openssl=$(find_working openssl)
         if [ -n "$openssl" ]; then
           echo >&3 "KRB5OPENSSL='$openssl'"
@@ -63,12 +85,19 @@ if [ -n "$file" ]; then
   else
     echo >&3 "unset DISPLAY"
   fi
-
-  echo >&3 2>/dev/null ". $HOME/.bash_profile"
-  [ -f "$BECOME/all" ] && cat >&3 2>/dev/null "$BECOME/all"
-  [ -f "$BECOME/$user" ] && cat >&3 2>/dev/null "$BECOME/$user"
+  if [ ! "$PROFILE_HOME" = "$HOME" ]; then
+    echo >&3 "export SCREENRC=$PROFILE_HOME/.screenrc"
+  fi
+else
+  exit 111
 fi
 
+echo >&3 ". ${PROFILE_HOME:-$HOME}/.bash_profile"
+[ -f "$allusersprofile" ] && cat >&3 2>/dev/null "$allusersprofile"
+[ -f "$userprofile" ] && cat >&3 2>/dev/null "$userprofile"
+[ $chdir = 1 ] && echo >&3 2>/dev/null "cd - &>/dev/null"
+
+exec 3>&-
 dir=$(dirname "$0")
 [ "$dir" = "." ] && dir="$PWD"
 exec sudo -H -u "$user" "$dir/became"