From 64e3c5d087dc5c94bf2bc5698608daf546fdcf2d Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <e.dolstra@tudelft.nl>
Date: Thu, 29 Sep 2005 15:58:41 +0000
Subject: * Add an operation `--print-rpath' to print the RPATH of the library 
  or executable and exit.

---
 src/patchelf.c  | 14 ++++++++++++--
 tests/shrink.sh | 14 +++++++-------
 2 files changed, 19 insertions(+), 9 deletions(-)

diff --git a/src/patchelf.c b/src/patchelf.c
index adf1c8f..a957aa1 100644
--- a/src/patchelf.c
+++ b/src/patchelf.c
@@ -16,6 +16,7 @@
 static char * fileName = 0;
 static char * newInterpreter = 0;
 static int doShrinkRPath = 0;
+static int printRPath = 0;
 static int printInterpreter = 0;
 
 
@@ -188,7 +189,7 @@ static void concat(char * dst, char * src)
 static void shrinkRPath(void)
 {
     /* Shrink the RPATH. */
-    if (doShrinkRPath) {
+    if (doShrinkRPath || printRPath) {
 
         /* Find the .dynamic section. */
         int i, dynSec = 0;
@@ -241,6 +242,11 @@ static void shrinkRPath(void)
             }
         }
 
+        if (printRPath) {
+            printf("%s\n", rpath ? rpath : "");
+            exit(0);
+        }
+        
         if (!rpath) {
             fprintf(stderr, "no RPATH to shrink\n");
             return;
@@ -311,7 +317,7 @@ static void shrinkRPath(void)
 
 static void patchElf(void)
 {
-    if (!printInterpreter)
+    if (!printInterpreter && !printRPath)
         fprintf(stderr, "patching ELF file `%s'\n", fileName);
 
     mode_t fileMode;
@@ -395,6 +401,7 @@ int main(int argc, char * * argv)
   [--interpreter FILENAME]\n\
   [--print-interpreter]\n\
   [--shrink-rpath]\n\
+  [--print-rpath]\n\
   FILENAME\n", argv[0]);
         return 1;
     }
@@ -411,6 +418,9 @@ int main(int argc, char * * argv)
         else if (strcmp(argv[i], "--shrink-rpath") == 0) {
             doShrinkRPath = 1;
         }
+        else if (strcmp(argv[i], "--print-rpath") == 0) {
+            printRPath = 1;
+        }
         else break;
     }
 
diff --git a/tests/shrink.sh b/tests/shrink.sh
index fe50346..563270f 100755
--- a/tests/shrink.sh
+++ b/tests/shrink.sh
@@ -1,8 +1,8 @@
 #! /bin/sh -e
 
-echo -n "RPATH before: "
-readelf -a ./libfoo.so | grep RPATH
-if ! readelf -a ./libfoo.so | grep RPATH | grep -q /no-such-path; then
+rpath=$(../src/patchelf --print-rpath ./libfoo.so)
+echo "RPATH before: $rpath"
+if ! echo "$rpath" | grep -q /no-such-path; then
     echo "incomplete RPATH"
     exit 1
 fi
@@ -12,10 +12,10 @@ mkdir -p scratch
 cp libfoo.so scratch/
 ../src/patchelf --shrink-rpath scratch/libfoo.so
 
-echo -n "RPATH after: "
-readelf -a scratch/libfoo.so | grep RPATH
-if readelf -a scratch/libfoo.so | grep RPATH | grep -q /no-such-path; then
-    echo "incomplete RPATH"
+rpath=$(../src/patchelf --print-rpath scratch/libfoo.so)
+echo "RPATH after: $rpath"
+if echo "$rpath" | grep -q /no-such-path; then
+    echo "RPATH not shrunk"
     exit 1
 fi
 
-- 
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