107 lines
3.1 KiB
Markdown
107 lines
3.1 KiB
Markdown
PatchELF is a simple utility for modifying existing ELF executables and
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libraries. In particular, it can do the following:
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* Change the dynamic loader ("ELF interpreter") of executables:
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```console
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$ patchelf --set-interpreter /lib/my-ld-linux.so.2 my-program
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```
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* Change the `RPATH` of executables and libraries:
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```console
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$ patchelf --set-rpath /opt/my-libs/lib:/other-libs my-program
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```
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* Shrink the `RPATH` of executables and libraries:
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```console
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$ patchelf --shrink-rpath my-program
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```
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This removes from the `RPATH` all directories that do not contain a
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library referenced by `DT_NEEDED` fields of the executable or library.
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For instance, if an executable references one library `libfoo.so`, has
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an RPATH `/lib:/usr/lib:/foo/lib`, and `libfoo.so` can only be found
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in `/foo/lib`, then the new `RPATH` will be `/foo/lib`.
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In addition, the `--allowed-rpath-prefixes` option can be used for
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further rpath tuning. For instance, if an executable has an `RPATH`
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`/tmp/build-foo/.libs:/foo/lib`, it is probably desirable to keep
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the `/foo/lib` reference instead of the `/tmp` entry. To accomplish
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that, use:
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```console
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$ patchelf --shrink-rpath --allowed-rpath-prefixes /usr/lib:/foo/lib my-program
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```
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* Remove declared dependencies on dynamic libraries (`DT_NEEDED`
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entries):
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```console
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$ patchelf --remove-needed libfoo.so.1 my-program
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```
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This option can be given multiple times.
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* Add a declared dependency on a dynamic library (`DT_NEEDED`):
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```console
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$ patchelf --add-needed libfoo.so.1 my-program
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```
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This option can be give multiple times.
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* Replace a declared dependency on a dynamic library with another one
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(`DT_NEEDED`):
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```console
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$ patchelf --replace-needed liboriginal.so.1 libreplacement.so.1 my-program
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```
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This option can be give multiple times.
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* Change `SONAME` of a dynamic library:
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```console
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$ patchelf --set-soname libnewname.so.3.4.5 path/to/libmylibrary.so.1.2.3
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```
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## Compiling and Testing
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### Via Autotools
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```console
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./bootstrap.sh
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./configure
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make
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make check
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sudo make install
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```
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### Via Nix
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You can build with Nix in several ways.
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1. Building via `nix build` will produce the result in `./result/bin/patchelf`. If you would like to build _patchelf_ with _musl_ try `nix build .#patchelf-musl`
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2. You can launch a development environment with `nix develop` and follow the autotools steps above. If you would like to develop with _musl_ try `nix develop .#musl`
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## Author
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Copyright 2004-2019 Eelco Dolstra <edolstra@gmail.com>.
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## License
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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