libwhich

Like which, for dynamic libraries.

Also a bit like ldd and otool -L.

Sample usage:

$ ./libwhich libgobject-2.0.so
library:
  /usr/lib/x86_64-linux-gnu/libgobject-2.0.so

dependencies:
  /lib/x86_64-linux-gnu/libdl.so.2
  /lib/x86_64-linux-gnu/libc.so.6
  /lib64/ld-linux-x86-64.so.2
+ /usr/lib/x86_64-linux-gnu/libgobject-2.0.so
+ /lib/x86_64-linux-gnu/libglib-2.0.so.0
+ /usr/lib/x86_64-linux-gnu/libffi.so.6
+ /lib/x86_64-linux-gnu/libpcre.so.3
+ /lib/x86_64-linux-gnu/libpthread.so.0

On Darwin, this resolves the library paths fully. To reverse that, feed the library path to otool -D.

On Linux, this returns the computed path from which the shared library was loaded. To normalize the path instead, use readlink.

For script usage, the following options are also supported:

$ ./libwhich -p <library>

• -p print just the library path to stdout
• -a print all dependencies (including the library itself) to stdout, separated by NUL (``\0'') characters
• -d direct dependencies (excluding the library), separated by NUL (``\0'') characters

Building

Building is straightforward: just run make.

Run tests with ./test-libwhich.sh or make check (requires gsed).