From 618220bfb55c875d6a4d197cb24fe632ac93ec85 Mon Sep 17 00:00:00 2001
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From: Wolfgang Grandegger <wg@grandegger.com>
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Date: Mon, 20 Feb 2017 16:29:24 +0100
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Subject: [PATCH] Add option to make the rpath relative under a specified root
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directory
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Running "patchelf" with the option "--make-rpath-relative ROOTDIR" will
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modify or delete the RPATHDIRs according the following rules
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similar to Martin's patches [1] making the Buildroot toolchaing/SDK
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relocatable.
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RPATHDIR starts with "$ORIGIN":
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The original build-system already took care of setting a relative
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RPATH, resolve it and test if it's valid (does exist)
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RPATHDIR starts with ROOTDIR:
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The original build-system added some absolute RPATH (absolute on
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the build machine). Test if it's valid (does exist).
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ROOTDIR/RPATHDIR exists:
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The original build-system already took care of setting an absolute
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RPATH (absolute in the final rootfs), resolve it and test if it's
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valid (does exist).
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RPATHDIR points somewhere else:
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(can be anywhere: build trees, staging tree, host location,
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non-existing location, etc.). Just discard such a path.
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The option "--no-standard-libs" will discard RPATHDIRs ROOTDIR/lib and
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ROOTDIR/usr/lib. Like "--shrink-rpath", RPATHDIRs are also discarded
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if the directories do not contain a library referenced by the
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DT_NEEDED fields.
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If the option "--relative-to-file" is given, the rpath will start
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with "$ORIGIN" making it relative to the ELF file, otherwise an
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absolute path relative to ROOTDIR will be used.
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A pull request for a similar patch [2] for mainline inclusion is
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pending.
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[1] http://lists.busybox.net/pipermail/buildroot/2016-April/159422.html
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[2] https://github.com/NixOS/patchelf/pull/118
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Signed-off-by: Wolfgang Grandegger <wg@grandegger.com>
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---
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src/patchelf.cc | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++------
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1 file changed, 175 insertions(+), 21 deletions(-)
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diff --git a/src/patchelf.cc b/src/patchelf.cc
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index 1d9a772..35b4a33 100644
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--- a/src/patchelf.cc
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+++ b/src/patchelf.cc
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@@ -46,6 +46,10 @@ static bool debugMode = false;
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static bool forceRPath = false;
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+static bool noStandardLibDirs = false;
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+
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+static bool relativeToFile = false;
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+
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static string fileName;
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static int pageSize = PAGESIZE;
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@@ -77,6 +81,49 @@ static unsigned int getPageSize(){
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return pageSize;
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}
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+static bool absolutePathExists(const string & path, string & canonicalPath)
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+{
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+ char *cpath = realpath(path.c_str(), NULL);
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+ if (cpath) {
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+ canonicalPath = cpath;
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+ free(cpath);
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+ return true;
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+ } else {
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+ return false;
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+ }
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+}
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+
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+static string makePathRelative(const string & path,
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+ const string & refPath)
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+{
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+ string relPath = "$ORIGIN";
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+ string p = path, refP = refPath;
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+ size_t pos;
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+
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+ /* Strip the common part of path and refPath */
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+ while (true) {
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+ pos = p.find_first_of('/', 1);
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+ if (refP.find_first_of('/', 1) != pos)
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+ break;
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+ if (p.substr(0, pos) != refP.substr(0, pos))
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+ break;
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+ if (pos == string::npos)
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+ break;
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+ p = p.substr(pos);
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+ refP = refP.substr(pos);
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+ }
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+ /* Check if both pathes are equal */
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+ if (p != refP) {
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+ pos = 0;
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+ while (pos != string::npos) {
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+ pos =refP.find_first_of('/', pos + 1);
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+ relPath.append("/..");
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+ }
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+ relPath.append(p);
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+ }
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+
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+ return relPath;
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+}
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template<ElfFileParams>
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class ElfFile
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@@ -183,9 +230,13 @@ public:
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void setInterpreter(const string & newInterpreter);
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- typedef enum { rpPrint, rpShrink, rpSet, rpRemove } RPathOp;
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+ typedef enum { rpPrint, rpShrink, rpMakeRelative, rpSet, rpRemove} RPathOp;
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+
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+ bool libFoundInRPath(const string & dirName,
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+ const vector<string> neededLibs,
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+ vector<bool> & neededLibFound);
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- void modifyRPath(RPathOp op, string newRPath);
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+ void modifyRPath(RPathOp op, string rootDir, string newRPath);
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void addNeeded(set<string> libs);
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@@ -1041,7 +1092,27 @@ static void concatToRPath(string & rpath, const string & path)
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template<ElfFileParams>
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-void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string newRPath)
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+bool ElfFile<ElfFileParamNames>::libFoundInRPath(const string & dirName,
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+ const vector<string> neededLibs, vector<bool> & neededLibFound)
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+{
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+ /* For each library that we haven't found yet, see if it
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+ exists in this directory. */
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+ bool libFound = false;
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+ for (unsigned int j = 0; j < neededLibs.size(); ++j)
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+ if (!neededLibFound[j]) {
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+ string libName = dirName + "/" + neededLibs[j];
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+ struct stat st;
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+ if (stat(libName.c_str(), &st) == 0) {
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+ neededLibFound[j] = true;
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+ libFound = true;
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+ }
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+ }
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+ return libFound;
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+}
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+
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+
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+template<ElfFileParams>
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+void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string rootDir, string newRPath)
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{
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Elf_Shdr & shdrDynamic = findSection(".dynamic");
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@@ -1096,6 +1167,11 @@ void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string newRPath)
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return;
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}
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+ if (op == rpMakeRelative && !rpath) {
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+ debug("no RPATH to make relative\n");
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+ return;
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+ }
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+
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if (op == rpShrink && !rpath) {
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debug("no RPATH to shrink\n");
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return;
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@@ -1120,26 +1196,80 @@ void ElfFile<ElfFileParamNames>::modifyRPath(RPathOp op, string newRPath)
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continue;
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}
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- /* For each library that we haven't found yet, see if it
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- exists in this directory. */
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- bool libFound = false;
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- for (unsigned int j = 0; j < neededLibs.size(); ++j)
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- if (!neededLibFound[j]) {
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- string libName = dirName + "/" + neededLibs[j];
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- struct stat st;
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- if (stat(libName.c_str(), &st) == 0) {
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- neededLibFound[j] = true;
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- libFound = true;
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- }
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- }
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-
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- if (!libFound)
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+ if (!libFoundInRPath(dirName, neededLibs, neededLibFound))
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debug("removing directory `%s' from RPATH\n", dirName.c_str());
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else
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concatToRPath(newRPath, dirName);
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}
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}
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+ /* Make the the RPATH relative to the specified path */
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+ if (op == rpMakeRelative) {
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+ vector<bool> neededLibFound(neededLibs.size(), false);
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+ string fileDir = fileName.substr(0, fileName.find_last_of("/"));
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+
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+ newRPath = "";
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+
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+ vector<string> rpathDirs = splitColonDelimitedString(rpath);
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+ for (vector<string>::iterator it = rpathDirs.begin(); it != rpathDirs.end(); ++it) {
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+ const string & dirName = *it;
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+
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+ string canonicalPath;
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+
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+ /* Figure out if we should keep or discard the path. There are several
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+ cases to be handled:
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+ "dirName" starts with "$ORIGIN":
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+ The original build-system already took care of setting a relative
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+ RPATH. Resolve it and test if it's valid (does exist).
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+ "dirName" start with "rootDir":
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+ The original build-system added some absolute RPATH (absolute on
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+ the build machine). Test if it's valid (does exist).
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+ "rootDir"/"dirName" exists:
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+ The original build-system already took care of setting an absolute
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+ RPATH (absolute in the final rootfs). Resolve it and test if it's
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+ valid (does exist).
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+ "dirName" points somewhere else:
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+ (can be anywhere: build trees, staging tree, host location,
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+ non-existing location, etc.). Just discard such a path. */
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+ if (!dirName.compare(0, 7, "$ORIGIN")) {
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+ string path = fileDir + dirName.substr(7);
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+ if (!absolutePathExists(path, canonicalPath)) {
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+ debug("removing directory '%s' from RPATH because '%s' doesn't exist\n",
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+ dirName.c_str(), path.c_str());
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+ continue;
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+ }
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+ } else if (!dirName.compare(0, rootDir.length(), rootDir)) {
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+ if (!absolutePathExists(dirName, canonicalPath)) {
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+ debug("removing directory '%s' from RPATH because it doesn't exist\n", dirName.c_str());
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+ continue;
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+ }
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+ } else {
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+ string path = rootDir + dirName;
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+ if (!absolutePathExists(path, canonicalPath)) {
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+ debug("removing directory '%s' from RPATH because it's not in rootdir\n",
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+ dirName.c_str());
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+ continue;
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+ }
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+ }
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+
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+ if (noStandardLibDirs) {
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+ if (!canonicalPath.compare(rootDir + "/lib") ||
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+ !canonicalPath.compare(rootDir + "/usr/lib")) {
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+ debug("removing directory '%s' from RPATH because it's a standard library directory\n",
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+ dirName.c_str());
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+ continue;
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+ }
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+ }
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+
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+ /* Finally make "canonicalPath" relative to "filedir" in "rootDir" */
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+ if (relativeToFile)
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+ concatToRPath(newRPath, makePathRelative(canonicalPath, fileDir));
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+ else
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+ concatToRPath(newRPath, canonicalPath.substr(rootDir.length()));
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+ debug("keeping relative path of %s\n", canonicalPath.c_str());
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+ }
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+ }
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+
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if (op == rpRemove) {
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if (!rpath) {
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debug("no RPATH to delete\n");
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@@ -1413,7 +1543,9 @@ static bool shrinkRPath = false;
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static bool removeRPath = false;
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static bool setRPath = false;
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static bool printRPath = false;
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+static bool makeRPathRelative = false;
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static string newRPath;
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+static string rootDir;
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static set<string> neededLibsToRemove;
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static map<string, string> neededLibsToReplace;
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static set<string> neededLibsToAdd;
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@@ -1438,14 +1570,16 @@ static void patchElf2(ElfFile & elfFile)
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elfFile.setInterpreter(newInterpreter);
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if (printRPath)
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- elfFile.modifyRPath(elfFile.rpPrint, "");
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+ elfFile.modifyRPath(elfFile.rpPrint, "", "");
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if (shrinkRPath)
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- elfFile.modifyRPath(elfFile.rpShrink, "");
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+ elfFile.modifyRPath(elfFile.rpShrink, "", "");
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else if (removeRPath)
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- elfFile.modifyRPath(elfFile.rpRemove, "");
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+ elfFile.modifyRPath(elfFile.rpRemove, "", "");
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else if (setRPath)
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- elfFile.modifyRPath(elfFile.rpSet, newRPath);
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+ elfFile.modifyRPath(elfFile.rpSet, "", newRPath);
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+ else if (makeRPathRelative)
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+ elfFile.modifyRPath(elfFile.rpMakeRelative, rootDir, "");
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if (printNeeded) elfFile.printNeededLibs();
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@@ -1508,6 +1642,9 @@ void showHelp(const string & progName)
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[--set-rpath RPATH]\n\
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[--remove-rpath]\n\
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[--shrink-rpath]\n\
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+ [--make-rpath-relative ROOTDIR]\n\
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+ [--no-standard-lib-dirs]\n\
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+ [--relative-to-file]\n\
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[--print-rpath]\n\
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[--force-rpath]\n\
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[--add-needed LIBRARY]\n\
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@@ -1564,6 +1701,17 @@ int main(int argc, char * * argv)
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setRPath = true;
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newRPath = argv[i];
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}
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+ else if (arg == "--make-rpath-relative") {
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+ if (++i == argc) error("missing argument to --make-rpath-relative");
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+ makeRPathRelative = true;
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+ rootDir = argv[i];
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+ }
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+ else if (arg == "--no-standard-lib-dirs") {
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+ noStandardLibDirs = true;
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+ }
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+ else if (arg == "--relative-to-file") {
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+ relativeToFile = true;
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+ }
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else if (arg == "--print-rpath") {
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printRPath = true;
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}
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--
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1.9.1
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