* edits to address issues where spack concretization attempts to set properties on already-installed specs
* most added checks only need to check if the spec is concrete; they dont also need to check if the package is installed
* add test to ensure that patches are not applied to an installed spec
* add test to ensure that an error is detected when a dependent requests a dependency constraint which conflicts with a requested installed dependency
Fixes#5455
All methods within setup_package use an EnvironmentModifications object
to control the environment. Those modifications are applied at the end
of setup_package. Module loads for the build environment need to be
done after the rest of the environment modifications are applied, as
otherwise Spack may unset variables set by those modules (for example
LD_LIBRARY_PATH).
closes#2884closes#4684
In #1848 we decided to use `Spec.format` to expand certain tokens in
the module file naming scheme or in the environment variable name.
Not all the tokens that are allowed in `Spec.format` make sense in
module file generation. This PR restricts the set of tokens that can
be used, and adds tests to check that the intended behavior is respected.
Additionally, the names of environment variables set/modified by module
files were, up to now, always uppercase. There are packages though that
require case sensitive variable names to honor certain behaviors (e.g.
OpenMPI). This PR restricts the uppercase transformation in variable
names to `Spec.format` tokens.
fixes#5587
In trying to preserve patch ordering, #5476 made equality inconsistent
for the added 'patches' variant. This commit maintains the original
weak ordering of patch applications while preserving consistency of
comparisons. The ordering DOES NOT enter the hashing mechanism. It's
supposed to be a hotfix, while we think of a cleaner and more-permanent
solution.
- This steals the magic regular expressions that CTest uses to parse log
files and addds them to Spack. See here:
https://github.com/Kitware/CMake/blob/master/Source/CTest/cmCTestBuildHandler.cxx
These are BSD licensed, so the port is in `externa/ctest_log_parser.py`
- We currently use these to do better filtering of errors from build
output. Plan is to use them to generate good CDash output.
`spack blame` prints out the contributors to a package.
By modification time:
```
$ spack blame --time llvm
LAST_COMMIT LINES % AUTHOR EMAIL
3 days ago 2 0.6 Andrey Prokopenko <andrey.prok@gmail.com>
3 weeks ago 125 34.7 Massimiliano Culpo <massimiliano.culpo@epfl.ch>
3 weeks ago 3 0.8 Peter Scheibel <scheibel1@llnl.gov>
2 months ago 21 5.8 Adam J. Stewart <ajstewart426@gmail.com>
2 months ago 1 0.3 Gregory Becker <becker33@llnl.gov>
3 months ago 116 32.2 Todd Gamblin <tgamblin@llnl.gov>
5 months ago 2 0.6 Jimmy Tang <jcftang@gmail.com>
5 months ago 6 1.7 Jean-Paul Pelteret <jppelteret@gmail.com>
7 months ago 65 18.1 Tom Scogland <tscogland@llnl.gov>
11 months ago 13 3.6 Kelly (KT) Thompson <kgt@lanl.gov>
a year ago 1 0.3 Scott Pakin <pakin@lanl.gov>
a year ago 3 0.8 Erik Schnetter <schnetter@gmail.com>
3 years ago 2 0.6 David Beckingsale <davidbeckingsale@gmail.com>
3 days ago 360 100.0
```
Or by percent contribution:
```
$ spack blame --percent llvm
LAST_COMMIT LINES % AUTHOR EMAIL
3 weeks ago 125 34.7 Massimiliano Culpo <massimiliano.culpo@epfl.ch>
3 months ago 116 32.2 Todd Gamblin <tgamblin@llnl.gov>
7 months ago 65 18.1 Tom Scogland <tscogland@llnl.gov>
2 months ago 21 5.8 Adam J. Stewart <ajstewart426@gmail.com>
11 months ago 13 3.6 Kelly (KT) Thompson <kgt@lanl.gov>
5 months ago 6 1.7 Jean-Paul Pelteret <jppelteret@gmail.com>
3 weeks ago 3 0.8 Peter Scheibel <scheibel1@llnl.gov>
a year ago 3 0.8 Erik Schnetter <schnetter@gmail.com>
3 years ago 2 0.6 David Beckingsale <davidbeckingsale@gmail.com>
3 days ago 2 0.6 Andrey Prokopenko <andrey.prok@gmail.com>
5 months ago 2 0.6 Jimmy Tang <jcftang@gmail.com>
2 months ago 1 0.3 Gregory Becker <becker33@llnl.gov>
a year ago 1 0.3 Scott Pakin <pakin@lanl.gov>
3 days ago 360 100.0
```
- A package can depend on a special patched version of its dependencies.
- The `Spec` YAML (and therefore the hash) now includes the sha256 of
the patch in the `Spec` YAML, which changes its hash.
- The special patched version will be built separately from a "vanilla"
version of the same package.
- This allows packages to maintain patches on their dependencies
without affecting either the dependency package or its dependents.
This could previously be accomplished with special variants, but
having to add variants means the hash of the dependency changes
frequently when it really doesn't need to. This commit allows the
hash to change *just* for dependencies that need patches.
- Patching dependencies shouldn't be the common case, but some packages
(qmcpack, hpctoolkit, openspeedshop) do this kind of thing and it
makes the code structure mirror maintenance responsibilities.
- Note that this commit means that adding or changing a patch on a
package will change its hash. This is probably what *should* happen,
but we haven't done it so far.
- Only applies to `patch()` directives; `package.py` files (and their
`patch()` functions) are not hashed, but we'd like to do that in the
future.
- The interface looks like this: `depends_on()` can optionally take a
patch directive or a list of them:
depends_on(<spec>,
patches=patch(..., when=<cond>),
when=<cond>)
# or
depends_on(<spec>,
patches=[patch(..., when=<cond>),
patch(..., when=<cond>)],
when=<cond>)
- Previously, the `patch()` directive only took an `md5` parameter. Now
it only takes a `sha256` parameter. We restrict this because we want
to be consistent about which hash is used in the `Spec`.
- A side effect of hashing patches is that *compressed* patches fetched
from URLs now need *two* checksums: one for the downloaded archive and
one for the content of the patch itself. Patches fetched uncompressed
only need a checksum for the patch. Rationale:
- we include the content of the *patch* in the spec hash, as that is
the checksum we can do consistently for patches included in Spack's
source and patches fetched remotely, both compressed and
uncompressed.
- we *still* need the patch of the downloaded archive, because we want
to verify the download *before* handing it off to tar, unzip, or
another decompressor. Not doing so is a security risk and leaves
users exposed to any arbitrary code execution vulnerabilities in
compression tools.
- Functions returned by directives were all called `_execute`, which made
reading stack traces hard because you couldn't tell what directive a
frame came from.
- renamed them all to `_execute_<directive>`
- Exceptions in directives were only really used in one or two places --
get rid of the boilerplate init functions and let the callsite specify
the message.
- move `spack.cmd.checksum.get_checksums` to `spack.util.web.spider_checksums`
- move `spack.error.NoNetworkError` to `spack.util.web.NoNetworkError` since
it is only used there.
- Previously, dependencies and dependency_types were stored as separate
dicts on Package.
- This means a package can only depend on another in one specific way,
which is usually but not always true.
- Prior code unioned dependency types statically across dependencies on
the same package.
- New code stores dependency relationships as their own object, with a
spec constraint and a set of dependency types per relationship.
- Dependency types are now more precise
- There is now room to add more information to dependency relationships.
- New Dependency class lives in dependency.py, along with deptype
definitions that used to live in spack.spec.
Move deptype definitions to spack.dependency
* Add '--test=all' and '--test=root' options to test either the root or the root and all dependencies.
* add a test dependency type that is only used when --test is enabled.
* test dependencies are not added to the spec, but they are provided in the test environment.
closes#5473
Prior to this PR we were not exiting early for external packages, which
caused the `configure_options` property of the contexts to fail with
e.g. a key error because the DAG gets truncated for them. More
importantly Spack configure options don't make any sense for externals.
Now we exit early, and leave a message in the module file clarifying
that this package has been installed outside of Spack.
closes#5201
Currently, if a user sets an external package to have a prefix that is
one of the system paths (like '/usr') the module files that are
generated will prepend '/usr/bin' to 'PATH', etc. This is particularly
nasty at the time when a module file is unloaded, and e.g. paths like
'/usr/bin' will be discarded from PATH.
This PR solves the issue skipping system paths when a prefix inspection
is made to generate module files.
* Module files now are generated using a template engine refers #2902#3173
jinja2 has been hooked into Spack.
The python module `modules.py` has been splitted into several modules
under the python package `spack/modules`. Unit tests stressing module
file generation have been refactored accordingly.
The module file generator for Lmod has been extended to multi-providers
and deeper hierarchies.
* Improved the support for templates in module files.
Added an entry in `config.yaml` (`template_dirs`) to list all the
directories where Spack could find templates for `jinja2`.
Module file generators have a simple override mechanism to override
template selection ('modules.yaml' beats 'package.py' beats 'default').
* Added jinja2 and MarkupSafe to vendored packages.
* Spec.concretize() sets mutual spec-package references
The correct place to set the mutual references between spec and package
objects at the end of concretization. After a call to concretize we
should now be ensured that spec is the same object as spec.package.spec.
Code in `build_environment.py` that was performing the same operation
has been turned into an assertion to be defensive on the new behavior.
* Improved code and data layout for modules and related tests.
Common fixtures related to module file generation have been extracted
in `conftest.py`. All the mock configurations for module files have been
extracted from python code and have been put into their own yaml file.
Added a `context_property` decorator for the template engine, to make
it easy to define dictionaries out of properties.
The default for `verbose` in `modules.yaml` is now False instead of True.
* Extendable module file contexts + short description from docstring
The contexts that are used in conjunction with `jinja2` templates to
generate module files can now be extended from package.py and
modules.yaml.
Module files generators now infer the short description from package.py
docstring (and as you may expect it's the first paragraph)
* 'module refresh' regenerates all modules by default
`module refresh` without `--module-type` specified tries to
regenerate all known module types. The same holds true for `module rm`
Configure options used at build time are extracted and written into the
module files where possible.
* Fixed python3 compatibility, tests for Lmod and Tcl.
Added test for exceptional paths of execution when generating Lmod
module files.
Fixed a few compatibility issues with python3.
Fixed a bug in Tcl with naming_scheme and autoload + unit tests
* Updated module file tutorial docs. Fixed a few typos in docstrings.
The reference section for module files has been reorganized. The idea is
to have only three topics at the highest level:
- shell support + spack load/unload use/unuse
- module file generation (a.k.a. APIs + modules.yaml)
- module file maintenance (spack module refresh/rm)
Module file generation will cover the entries in modules.yaml
Also:
- Licenses have been updated to include NOTICE and extended to 2017
- docstrings have been reformatted according to Google style
* Removed redundant arguments to RPackage and WafPackage.
All the callbacks in `RPackage` and `WafPackage` that are not build
phases have been modified not to accept a `spec` and a `prefix`
argument. This permits to leverage the common `configure_args` signature
to insert by default the configuration arguments into the generated
module files. I think it's preferable to handling those packages
differently than `AutotoolsPackage`. Besides only one package seems
to override one of these methods.
* Fixed broken indentation + improved resiliency of refresh
Fixed broken indentation in `spack module refresh` (probably a rebase
gone silently wrong?). Filter the writers for blacklisted specs before
searching for name clashes. An error with a single writer will not
stop regeneration, but instead will print a warning and continue
the command.
- converted `log_path` and `env_path` to properties of PackageBase.
- InstallErrors in build_environment are now annotated with the package
that caused them, in the 'pkg' attribute.
- Add `--show-log-on-error` option to `spack install` that catches
InstallErrors and prints the log to stderr if it exists.
Note that adding a reference to the Pakcage allows a lot of stuff
currently handled by do_install() and build_environment to be handled
externally.
- '\b' in regular expression needs to be in a raw string (r'\b')
- Regression test that would've caught this was unintentionally disabled
- This fixes the string and the test
The correct place to set the mutual references between spec and
package objects is at the end of concretization. After a call to
concretize we should now be ensured that spec is the same object
as spec.package.spec.
Code in `build_environment.py` that was performing the same
operation has been turned into an assertion to be defensive on
the new behavior.
- Fixes bugs where concretization would fail due to an erroneously cached
_concrete attribute.
- Ripped out a bunch of code in spec.py that isn't needed/valid anymore:
- The various concrete() methods on different types of Specs would
attempt to statically compute whether the Spec was concrete.
- This dates back to when DAGs were simpler and there were no optional
dependencies. It's actually NOT possible to compute statically
whether a Spec is concrete now. The ONLY way you know is if it goes
through concretization and is marked concrete once that completes.
- This commit removes all simple concreteness checks and relies only on
the _concrete attribute. This should make thinking about
concreteness simpler.
- Fixed a couple places where Specs need to be marked concrete explicitly.
- Specs read from files and Specs that are destructively copied from
concrete Specs now need to be marked concrete explicitly.
- These spots may previously have "worked", but they were brittle and
should be explcitly marked anyway.
- Dependencies in concrete specs did not previously have their cache
fields (_concrete, _normal, etc.) preserved.
- _dup and _dup_deps weren't passing each other enough information to
preserve concreteness properly, so only the root was properly
preserved.
- cached concreteness is now preserved properly for the entire DAG, not
just the root.
- added method docs.
Fixes#4112
This commit extends the support of the AutotoolsPackage methods
`with_or_without` and `enable_or_disable` to bool-valued variants. It
also defines for those functions a convenience short-cut if the
activation parameter is the prefix of a spec (like in
`--with-{pkg}={prefix}`).
This commit also includes:
* Updates to viennarna and adios accordingly: they have been modified to
use `enable_or_disable` and `with_or_without`
* Improved docstrings in `autotools.py`. Raise `KeyError` if name is
not a variant.
Renames the existing bootstrap command to 'clone'. Repurposes
'spack bootstrap' to install packages that are useful to the
operation of Spack (for now this is just environment-modules).
For bash and ksh users running setup-env.sh, if a Spack-installed
instance of environment-modules is detected and environment modules
and dotkit are not externally available, Spack will define the
'module' command in the user's shell to use the environment-modules
built by Spack.
First, quote the environment variable values. Second, export the
variables. sorry, this is bourn-shell syntax. Happy to consider a
shell-independent way to do this, but spack is already using sh-like
"env=value"
* Added support to query packages by tags.
- The querying commands `spack list`, `spack find` and `spack info` have
been modified to support querying by tags. Tests have been added to
check that the feature is working correctly under what should be the
most frequent use cases.
* Refactored Repo class to make insertion of new file caches easier.
- Added the class FastPackageChecker. This class is a Mapping from
package names to stat info, that gets memoized for faster access.
- Extracted the creation of a ProviderIndex to its own factory function.
* Added a cache file for tags.
- Following what was done for providers, a TagIndex class has been added.
This class can serialize and deserialize objects from json. Repo and
RepoPath have a new method 'packages_with_tags', that uses the TagIndex
to compute a list of package names that have all the tags passed as
arguments.
On Ubuntu 14.04 the effect if the cache reduces the time for spack list
from ~3sec. to ~0.3sec. after the cache has been built.
* Fixed colorization of `spack info`
This command broke after #5109. It was using the default value for the
"dirty" argument in `setup_package`. Now it adopts the same logic as
in `spack install`. Changed help for '--clean' and '--dirty'.
Improved coverage of spack env.
The private method `Spec._dup` was missing a line (when setting compiler
flags the parent spec was not set to `self`). This resulted in
an inconsistent state of the duplicated Spec. This problem has been
fixed here. The docstring of `Spec._dup` has been updated.
This change is done to avoid inconsistencies during refactoring. The rationale is that functions at different levels in the call stack all define a default for the 'dirty' argument. This PR removes the default value for all the functions except the top-level one (`PackageBase.do_install`).
In this way not defining 'dirty' will result in an error, instead of the default value being used. This will reduce the risk of having an inconsistent behavior after a refactoring.
* Respect --insecure when fetching list_url.
* Ensure support for Python 2.6, and that urlopen works for python versions prior 2.7.9 and between 3.0 and 3.4.3.
* Simplified Spec.__init__ signature by removing the *dep_like argument.
The `*dep_like` argument of `Spec.__init__` is used only for tests. This
PR removes it from the call signature and introduces an equivalent
fixture to be used in tests.
* Refactored ``spec_from_dict`` to be a static method of ``Spec``
The fixture ``spec_from_dict`` has been refactored to be a static method
of ``Spec``. Test code has been updated accordingly. Added tests for
exceptional paths.
* Renamed argument `unique` to `normal` + added LazySpecCache class
As requested in the review the argument `unique` of `Spec.from_literal`
has been renamed to `normal`. To avoid eager evaluations of
`Spec(spec_like)` expressions a subclass of `collections.defaultdict`
has been introduced.
* Spec object can be keys of the dictionary for a spec literal.
Added back the possibility use a spec directly as a key. This permits
to build DAGs that are partially normalized.
- Update handling of ChildError so that its output is capturable from a
SpackCommand
- Update cmd/install test to make sure Python and build log output is
being displayed properly.
- install and probably other commands were designed to run once, but now
we can to test them from within Spack with SpackCommand
- cmd/install.py assumed that it could modify do_install in PackageBase
and leave it that way; this makes the decorator temporary
- package.py didn't properly initialize its stage if the same package had
been built successfully before (and the stage removed).
- manage stage lifecycle better and remember when Package needs to
re-create the stage
- If a failure comes from an external command and NOT the Python code,
display errors highlighted with some context.
- Add some rudimentary support for parsing errors out of the build log
(not very sophisticated yet).
- Build errors in Python code will still display with Python context.
Users can now add an optional custom message to the conflicts directive.
Layout on screen has been changed to improve readability and the long
spec is shown in tree format. Two conflicts in `espresso` have been
modified to showcase the feature.
- Python I/O would not properly interleave (or appear) with output from
subcommands.
- Add a flusing wrapper around sys.stdout and sys.stderr when
redirecting, so that Python output is synchronous with that of
subcommands.
- 'v' toggle was previously only good for the current install.
- subsequent installs needed user to press 'v' again.
- 'v' state is now preserved across dependency installs.
- Previously we would use `os._exit()` in to avoid Spack error handling
in the parent process when build processes failed. This isn't
necessary anymore since build processes propagate their exceptions to
the parent process.
- Use `sys.exit` instead of `os._exit`. This has the advantage of
automatically flushing output streams on quit, so output from child
processes is not lost when Spack exits.
- Simplify interface to log_output. New interface requires only one
context handler instead of two. Before:
with log_output('logfile.txt') as log_redirection:
with log_redirection:
# do things ... output will be logged
After:
with log_output('logfile.txt'):
# do things ... output will be logged
If you also want the output to be echoed to ``stdout``, use the
`echo` parameter::
with log_output('logfile.txt', echo=True):
# do things ... output will be logged and printed out
And, if you just want to echo *some* stuff from the parent, use
``force_echo``:
with log_output('logfile.txt', echo=False) as logger:
# do things ... output will be logged
with logger.force_echo():
# things here will be echoed *and* logged
A key difference between this and the previous implementation is that
*everything* in the context handler is logged. Previously, things like
`Executing phase 'configure'` would not be logged, only output to the
screen, so understanding phases in the build log was difficult.
- The implementation of `log_output()` is different in two major ways:
1. This implementation avoids race cases by using only one pipe (before
we had a multiprocessing pipe and a unix pipe). The logger daemon
stops naturally when the input stream is closed, which avoids a race
in the previous implementation where we'd miss some lines of output
because the parent would shut the daemon down before it was done
with all output.
2. Instead of turning output redirection on and off, which prevented
some things from being logged, this version uses control characters
in the output stream to enable/disable forced echoing. We're using
the time-honored xon and xoff codes, which tell the daemon to echo
anything between them AND write it to the log. This is how
`logger.force_echo()` works.
- Fix places where output could get stuck in buffers by flushing more
aggressively. This makes the output printed to the terminal the same
as that which would be printed through a pipe to `cat` or to a file.
Previously these could be weirdly different, and some output would be
missing when redirecting Spack to a file or pipe.
- Simplify input and color handling in both `build_environment.fork()`
and `llnl.util.tty.log.log_output()`. Neither requires an input_stream
parameter anymore; we assume stdin will be forwarded if possible.
- remove `llnl.util.lang.duplicate_stream()` and remove associated
monkey-patching in tests, as these aren't needed if you just check
whether stdin is a tty and has a fileno attribute.
- Fix issue with color formatting regular expression.
- _separators regex in spec.py could be constructed such that '^' came
first in the character matcher, e.g. '[^@#/]'. This inverts the match
and causes transient KeyErrors.
- Fixed to escape all characters in the constructed regex.
- This bug comes up in Python3 due to its more randomized hash iteration
order, but it could probably also happen in a Python 2 implementation.
- also clean up variable docstrings in spec.py
- Mac OS X Sierra has no /usr/include by default
- Instead of assuming there's an include directory in /usr, mock up a directory that looks like we expect.
This adds sbang hook support for node-js and fixes the sbang filter
for lua (the character class exclusion was swallowing newlines and
reporting a false positive if lua was mentioned anywhere in the
file).
* Docs: Travis-CI Workflow
Add a workflow how to use spack on Travis-CI.
Future Work:
depending if and how we can simplify 5101:
add a multi-compiler, multi-C++-standard, multi-software
build matrix example
* Fix Typos
* Colorize spack info. Adds prominence to preferred version. fixes#2708
This uses 'llnl.util.tty.color' to colorize the output of 'spack info'.
It also displays versions in the order the concretizer would choose
them and shows the preferred in a line on its own and in bold.
* Modified output according to Adam and Denis reviews.
Section titles are not bold + black, but bold + blue. Added a new
section named "Preferred version", which prints the preferred version
in bold characters.
* Further modifications according to Adam and Denis reviews.
After "Homepage:" we now have a single space. Removed newline after each
variant. Preferred version is not in bold fonts anymore. Added a simple
test that just runs the command.
* Improved error message for unsatisfiable specs. fixes#5066
This PR improves the error message for unsatisfiable specs by showing in tree format both the spec that cannot satisfy the constraint and the spec that asked for that constraint. After that follows a readable error message.
This PR allows additional unused properties at the top-level of the config.yaml file. Having these properties permits to use two different versions of Spack, one of which adds a new property, without receiving error messages due to the presence of this new property in a configuration cache stored in the user's home.
This fixes a syntax error in the index.html file generated by the
"spack buildcache" command when creating build caches. This also
fixes support for installing unsigned binaries.
* Refactor IntelInstaller into IntelPackage base class
* Move license attributes from __init__ to class-level
* Flake8 fixes: remove unused imports
* Fix logic that writes the silent.cfg file
* More specific version numbers for Intel MPI
* Rework logic that selects components to install
* Final changes necessary to get intel package working
* Various updates to intel-parallel-studio
* Add latest version of every Intel package
* Add environment variables for Intel packages
* Update env vars for intel package
* Finalize components for intel-parallel-studio package
Adds a +tbb variant to intel-parallel-studio.
The tbb package was renamed to intel-tbb.
Now both intel-tbb and intel-parallel-studio+tbb
provide tbb.
* Overhaul environment variables set by intel-parallel-studio
* Point dependent packages to the correct MPI wrappers
* Never default to intel-parallel-studio
* Gather env vars by sourcing setup scripts
* Use mpiicc instead of mpicc when using Intel compiler
* Undo change to ARCH
* Add changes from intel-mpi to intel-parallel-studio
* Add comment explaining mpicc vs mpiicc
* Prepend env vars containing 'PATH' or separators
* Flake8 fix
* Fix bugs in from_sourcing_file
* Indentation fix
* Prepend, not set if contains separator
* Fix license symlinking broken by changes to intel-parallel-studio
* Use comments instead of docstrings to document attributes
* Flake8 fixes
* Use a set instead of a list to prevent duplicate components
* Fix MKL and MPI library linking directories
* Remove +all variant from intel-parallel-studio
* It is not possible to build with MKL, GCC, and OpenMP at this time
* Found a workaround for locating GCC libraries
* Typos and variable names
* Fix initialization of empty LibraryList
Adds the "buildcache" command to spack. The buildcache command is
used to create gpg signatures for archives of installed spack
packages; the signatures and archives are placed together in a
directory that can be added to a spack mirror. A user can retrieve
the archives from a mirror and verify their integrity using the
buildcache command. It is often the case that the user's Spack
instance is located in a different path compared to the Spack
instance used to generate the package archive and signature, so
this includes logic to relocate the RPATHs generated by Spack.
The action `CleanOrDirtyAction` has been added. It sets the default
value for `dest` to `spack.dirty`, and changes it according to the flags
passed via command line. Added unit tests to check that the arguments
are parsed correctly. Removed lines in `PackageBase` that were setting
the default value of dirty according to what was in the configuration.
Popen.communicate outputs a str object for python2 and a bytes
object for python3. This updates the Executable.__call__ function
to call .decode on the output of Popen.communicate only for python3.
This ensures that Executable.__call__ returns a str for python2 and
python3.
fixes#4236fixes#5002
When a package is defined in more than one repository,
RepoPath.dirname_for_package_name may return the path
to either definition. This sidesteps that ambiguity by
accessing the module associated with the package definition.
* Merged 'purge' command with 'clean'. Deleted 'purge'. fixes#2942
'spack purge' has been merged with 'spack clean'. Documentation has been
updated accordingly. The 'clean' and 'purge' behavior are not mutually
exclusive, and they log brief information to tty while they go.
* Fixed a wrong reference to spack clean in the docs
* Added tests for 'spack clean'. Updated bash completion.
* Typo fixes in docstrings.
* Let OS classes know if the paths they get were explicitly specified by user.
* Fixed regexp for cray compiler version matching.
* Replaced LinuxDistro with CrayFrontend for the Cray platform's frontend.
Fixes#4898
Constraints that were supposed to be conditionally activated for
specified values of a single-valued variant were being activated
unconditionally in the case that the variant was associated with
an implicit dependency. For example if X->Y->Z and Y places a
conditional constraint on Z for a given single-valued variant on
Y, then it would have been applied unconditionally when
concretizing X.
