sd-tool: Enhance detection of "share" folder

No longer look in default locations (to not mix versions) and variable
directories (".", "..") to not inject foreign/malicious code, but try to
get the correct path name from the path of the sd-tool script.

diff --git a/bin/sd-tool b/bin/sd-tool
index d98a72ee6c0559d00c74c2e5d0b04623a525347b..550e8d8019362f8646f2ee1b48c09c1d5da2d1b7 100755 (executable)
--- a/bin/sd-tool
+++ b/bin/sd-tool
@@ -9,9 +9,11 @@
 # (at your option) any later version.
 #
 
+BIN_D=$(dirname "$0")
+
 # Detect our "share" folder ...
 unset SHARE_D
-for d in . .. /usr/local /usr; do
+for d in "${BIN_D}" "${BIN_D}"/..; do
        for s in share share/sd-tool; do
                if [[ -r "${d}/${s}/sd-tool-common.inc.sh" ]]; then
                        SHARE_D="${d}/${s}"