spack.hooks package


spack.hooks.absolutify_elf_sonames module

class spack.hooks.absolutify_elf_sonames.SharedLibrariesVisitor(exclude_list)[source]

Bases: BaseDirectoryVisitor

Visitor that collects all shared libraries in a prefix, with the exception of an exclude list.

before_visit_dir(root, rel_path, depth)[source]

Return True from this function to recurse into the directory at os.path.join(root, rel_path). Return False in order not to recurse further.

  • root (str) – root directory

  • rel_path (str) – relative path to current directory from root

  • depth (int) – depth of current directory from the root directory


True when the directory should be recursed into. False when not

Return type


before_visit_symlinked_dir(root, rel_path, depth)[source]

Return True to recurse into the symlinked directory and False in order not to. Note: rel_path is the path to the symlink itself. Following symlinked directories blindly can cause infinite recursion due to cycles.

  • root (str) – root directory

  • rel_path (str) – relative path to current symlink from root

  • depth (int) – depth of current symlink from the root directory


True when the directory should be recursed into. False when not

Return type



Get the libraries that should be patched, with the excluded libraries removed.

visit_file(root, rel_path, depth)[source]

Handle the non-symlink file at os.path.join(root, rel_path)

  • root (str) – root directory

  • rel_path (str) – relative path to current file from root

  • depth (int) – depth of current file from the root directory

visit_symlinked_file(root, rel_path, depth)[source]

Handle the symlink to a file at os.path.join(root, rel_path). Note: rel_path is the location of the symlink, not to what it is pointing to. The symlink may be dangling.

  • root (str) – root directory

  • rel_path (str) – relative path to current symlink from root

  • depth (int) – depth of current symlink from the root directory

spack.hooks.absolutify_elf_sonames.find_and_patch_sonames(prefix, exclude_list, patchelf)[source]

Return true if filepath is most a shared library. Our definition of a shared library for ELF requires: 1. a dynamic section, 2. a soname OR lack of interpreter. The problem is that PIE objects (default on Ubuntu) are ET_DYN too, and not all shared libraries have a soname… no interpreter is typically the best indicator then.

spack.hooks.absolutify_elf_sonames.patch_sonames(patchelf, root, rel_paths)[source]

Set the soname to the file’s own path for a list of given shared libraries.


spack.hooks.licensing module


This hook symlinks local licenses to the global license for licensed software.


This hook handles global license setup for licensed software.


Prompt the user, letting them know that a license is required.

For packages that rely on license files, a global license file is created and opened for editing.

For packages that rely on environment variables to point to a license, a warning message is printed.

For all other packages, documentation on how to set up a license is printed.

Create local symlinks that point to the global license file.

spack.hooks.licensing.write_license_file(pkg, license_path)[source]

Writes empty license file.

Comments give suggestions on alternative methods of installing a license.

spack.hooks.module_file_generation module


spack.hooks.permissions_setters module


spack.hooks.sbang module

exception spack.hooks.sbang.SbangPathError(message, long_message=None)[source]

Bases: SpackError

Raised when the install tree root is too long for sbang to work.


Adds a second shebang line, using sbang, at the beginning of a file, if necessary. Note: Spack imposes a relaxed shebang line limit, meaning that a newline or end of file must occur before spack_shebang_limit bytes. If not, the file is not patched.

spack.hooks.sbang.filter_shebangs_in_directory(directory, filenames=None)[source]

Ensure that sbang is installed in the root of Spack’s install_tree.

This is the shortest known publicly accessible path, and installing sbang here ensures that users can access the script and that sbang itself is in a short path.

spack.hooks.sbang.is_windows = False

Groupdb does not exist on Windows, prevent imports on supported systems


This hook edits scripts so that they call /bin/bash $spack_prefix/bin/sbang instead of something longer than the shebang limit.


Location sbang should be installed within Spack’s install_tree.


Full shebang line that should be prepended to files to use sbang.

The line returned does not have a final newline (caller should add it if needed).

This should be the only place in Spack that knows about what interpreter we use for sbang.

spack.hooks.sbang.spack_shebang_limit = 4096

Spack itself also limits the shebang line to at most 4KB, which should be plenty.

spack.hooks.write_install_manifest module


Module contents

This package contains modules with hooks for various stages in the Spack install process. You can add modules here and they’ll be executed by package at various times during the package lifecycle.

Each hook is just a function that takes a package as a parameter. Hooks are not executed in any particular order.

Currently the following hooks are supported:

  • pre_install(spec)

  • post_install(spec)

  • pre_uninstall(spec)

  • post_uninstall(spec)

  • on_install_start(spec)

  • on_install_success(spec)

  • on_install_failure(spec)

  • on_phase_success(pkg, phase_name, log_file)

  • on_phase_error(pkg, phase_name, log_file)

  • on_phase_error(pkg, phase_name, log_file)

  • post_env_write(env)

This can be used to implement support for things like module systems (e.g. modules, lmod, etc.) or to add other custom features.