Also respect a prefixed nm and strings too

(cherry picked from commit 1ab6930)

Author: heirecka

tests/shared-rpath.sh

@@ -2,7 +2,8 @@
 
 PATCHELF=$(readlink -f "../src/patchelf")
 SCRATCH="scratch/$(basename "$0" .sh)"
-READELF=${READELF:-readelf}
+NM=${NM:-nm}
+STRINGS=${STRINGS:-strings}
 
 LIB_NAME="${PWD}/libshared-rpath.so"
 
@@ -11,11 +12,11 @@ mkdir -p "${SCRATCH}"
 cd "${SCRATCH}"
 
 has_x() {
-    strings "$1" | grep -c "XXXXXXXX"
+    ${STRINGS} "$1" | grep -c "XXXXXXXX"
 }
 
-nm -D "${LIB_NAME}" | grep a_symbol_name
-previous_cnt="$(strings "${LIB_NAME}" | grep -c a_symbol_name)"
+${NM} -D "${LIB_NAME}" | grep a_symbol_name
+previous_cnt="$(${STRINGS} "${LIB_NAME}" | grep -c a_symbol_name)"
 
 echo "#### Number of a_symbol_name strings in the library: $previous_cnt"
 
@@ -25,12 +26,12 @@ echo "#### Rename the rpath to something larger than the original"
 "${PATCHELF}" --set-rpath a_very_big_rpath_that_is_larger_than_original  --output liblarge-rpath.so "${LIB_NAME}"
 
 echo "#### Checking symbol is still there"
-nm -D liblarge-rpath.so | grep a_symbol_name
+${NM} -D liblarge-rpath.so | grep a_symbol_name
 
 echo "#### Checking there are no Xs"
 [ "$(has_x liblarge-rpath.so)" -eq 0 ] || exit 1
 
-current_cnt="$(strings liblarge-rpath.so | grep -c a_symbol_name)"
+current_cnt="$(${STRINGS} liblarge-rpath.so | grep -c a_symbol_name)"
 echo "#### Number of a_symbol_name strings in the modified library: $current_cnt"
 [ "$current_cnt" -eq "$previous_cnt" ] || exit 1
 
@@ -40,10 +41,10 @@ echo "#### Rename the rpath to something shorter than the original"
 "${PATCHELF}" --set-rpath shrt_rpth  --output libshort-rpath.so "${LIB_NAME}"
 
 echo "#### Checking symbol is still there"
-nm -D libshort-rpath.so | grep a_symbol_name
+${NM} -D libshort-rpath.so | grep a_symbol_name
 
 echo "#### Number of a_symbol_name strings in the modified library: $current_cnt"
-current_cnt="$(strings libshort-rpath.so | grep -c a_symbol_name)"
+current_cnt="$(${STRINGS} libshort-rpath.so | grep -c a_symbol_name)"
 [ "$current_cnt" -eq "$previous_cnt" ] || exit 1
 
 echo "#### Now liblarge-rpath.so should have its own rpath, so it should be allowed to taint it"