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-rwxr-xr-xrellns-sh59
1 files changed, 35 insertions, 24 deletions
diff --git a/rellns-sh b/rellns-sh
index abe758a997..4c4b431a52 100755
--- a/rellns-sh
+++ b/rellns-sh
@@ -22,33 +22,44 @@ if test $# -ne 2; then
exit 1
fi
-case $1 in
-/*)
- # Make both paths absolute.
- to=`echo $1 | sed 's%^/%%'`
+# A problem with this script is that we must be able to handle symbolic
+# links somewhere in the paths of either path. To resolve symlinks we use
+# the `pwd' program. But some `pwd' programs are no real programs but
+# instead aliases (defined by the user) or builtins (as in bash-2). Both
+# kinds have in common that they might not give the correct result. E.g.,
+# the builtin in bash-2 returns the path which was used to change to the
+# directory and not the real path.
+#
+# To prevent this problem we make sure the real `pwd' somewhere in the
+# path is used. Currently there is only support for bash-2 available.
+# If other shells also have problems we have to add more code here.
+
+if test "$BASH_VERSINFO" = "2"; then
+ unalias pwd
+ unset pwd
+ enable -n pwd
+fi
- if test -d $2; then
- from=`echo $2 | sed 's%/*$%%'`
- else
- from=`echo $2 | sed 's%/*[^/]*$%%'`
- fi
+# Make both paths absolute.
+if test -d $1; then
+ to=`cd $1 && pwd`
+else
+ temp=`echo $1 | sed 's%/*[^/]*$%%'`
+ to=`cd $temp && pwd`
+ to="$to/`echo $1 | sed 's%.*/\([^/][^/]*\)$%\1%'`"
+fi
+to=`echo $to | sed 's%^/%%'`
- case "$from" in
- /*) from=`echo $from | sed 's%^/*%%'` ;;
- ?*) from=`cd $from && pwd | sed 's%^/%%'` ;;
- *) from=`pwd | sed 's%^/%%'` ;;
- esac
- ;;
-*)
- to=$1
+if test -d $2; then
+ from=`echo $2 | sed 's%/*$%%'`
+else
+ from=`echo $2 | sed 's%/*[^/]*$%%'`
+fi
- if test -d $2; then
- from=`echo $2 | sed 's%/*$%%'`
- else
- from=`echo $2 | sed 's%/*[^/]*$%%'`
- fi
- ;;
-esac
+if test -z "$from"; then
+ from=`pwd`;
+fi
+from=`cd $from && pwd | sed 's%^/%%'`
while test -n "$to" && test -n "$from"; do
preto=`echo $to | sed 's%^\([^/]*\)/.*%\1%'`