Copy became script to target directory.

Ensure the became script can be run when the source user's home
directory is not readable, by copying the script itself to the
target directory if the -D flag is used instead of -d.

diff --git a/opt/bin/become b/opt/bin/become
index ea4926d..07801c3 100755 (executable)
--- a/opt/bin/become
+++ b/opt/bin/become
@@ -3,9 +3,14 @@
 chdir=0
 kerberos=0
 x11=0
+copy=0
 dir=
-while getopts ":cd:kx" opt; do
+while getopts ":D:cd:kx" opt; do
   case $opt in
+    D)
+      copy=1
+      dir=$OPTARG
+    ;;
     c) chdir=1;;
     d) dir=$OPTARG;;
     k) kerberos=1;;
@@ -14,9 +19,17 @@ while getopts ":cd:kx" opt; do
 done
 shift $((OPTIND-1))
 
-if [ -z "$dir" ]; then
-  dir=${0%/*}
-  [ "$dir" = "$0" -o "$dir" = "." ] && dir=$PWD
+srcdir=${0%/*}
+[ "$srcdir" = "$0" -o "$srcdir" = "." ] && srcdir=$PWD
+if [ -n "$dir" ]; then
+  if [ $copy = 1 ]; then
+    if ! cp "$srcdir/became" "$dir/became"; then
+      echo >&2 "Failed to copy $srcdir/became to $dir!"
+      exit 100
+    fi
+  fi
+else
+  dir=$srcdir
 fi
 
 user="$1"; shift