Commit graph

5502 commits

Author SHA1 Message Date
Massimiliano Culpo
13b609b4b6
docs: quote string to show valid YAML (#31178)
fixes #31167
2022-06-17 18:25:52 +02:00
Chuck Atkins
85dc20cb55
Spec: Add a new virtual-customizable home attribute (#30917)
* Spec: Add a new virtual-customizable home attribute

* java: Use the new builtin home attribute

* python: Use the new builtin home attribute
2022-06-17 10:29:08 -04:00
Robert Cohn
466572dc14
Update Intel package descriptions (#31150) 2022-06-17 09:23:40 +02:00
Massimiliano Culpo
267358a799
ASP-based solver: fix rules on version weights selection (#31153)
* ASP: sort and deduplicate version weights from installed specs

* Pick version weights according to provenance

* Add unit test
2022-06-16 14:17:40 -07:00
Peter Scheibel
392b548312
Manifest parsing: avoid irrelevant files (#31144)
* Manifest directory may not contain manifest files: exclude non-manifest files
* Manifest files use different name for rocmcc: add translation for it
2022-06-16 15:16:48 -05:00
Massimiliano Culpo
895ceeda38
concretize.lp: impose a lower bound on the number of version facts if a solution exists (#31142)
* concretize.lp: impose a lower bound on the number of version facts if a valid version exists

fixes #30864

* Add a unit test
2022-06-16 09:25:56 -07:00
Tom Scogland
b261b2a5ff
Allow bootstrapping to work when partial or incompatible modules exist in the module path (#31035) 2022-06-15 19:09:07 +02:00
G-Ragghianti
bf6220821b
Make the IntelPackage fail successfully (#30773)
Co-authored-by: Robert Cohn <rscohn2@gmail.com>
2022-06-14 15:06:06 +02:00
Jordan Galby
e50d08ce48
Fix spack style arbitrary git rev as base (#31019)
Allow `spack style -b @` or `spack style -b origin/develop` to work as
expected.

Regression since spack 0.17 #25085
2022-06-13 15:22:35 +00:00
Danny McClanahan
0c7fd9bd8c
fix doubly shell quoting args to spack spec (#29282)
* add test to verify fix works
* fix spec cflags/variants parsing test (breaking change)
* fix `spack spec` arg quoting issue
* add error report for deprecated cflags coalescing
* use .group(n) vs subscript regex group extraction for 3.5 compat
* add random test for untested functionality to pass codecov
* fix new test failure since rebase
2022-06-11 12:35:46 -07:00
Todd Gamblin
bf2b30a5f5
bugfix: preserve dict order for Spec.dag_hash() in Python 2 (#31092)
Fix a bug introduced in #21720. `spack_json.dump()` calls `_strify()` on dictionaries to
convert `unicode` to `str`, but it constructs `dict` objects instead of
`collections.OrderedDict` objects, so in Python 2 (or earlier versions of 3) it can
scramble dictionary order.

This can cause hashes to differ between Python 2 and Python 3, or between Python 3.7
and earlier Python 3's.

- [x] use `OrderedDict` in `_strify`
- [x] add a regression test
2022-06-10 20:32:35 -07:00
Sergey Kosukhin
a2afd5b82f
clingo: fix string formatting in error messages (#31084) 2022-06-10 16:24:27 +00:00
Tim Fuller
01f8236bf5
Allow more fine-grained control over what submodules are updated (#27293)
The "submodules" argument of the "version" directive can now accept
a callable that returns a list of submodules, in addition to the usual
Boolean values
2022-06-09 07:45:49 +02:00
Massimiliano Culpo
d245c46487
bootstrap: account for disabled sources (#31042)
* bootstrap: account for disabled sources

Fix a bug introduced in #30192, which effectively skips
any prescription on disabled bootstrapping sources.

* Add unit test to avoid regression
2022-06-08 07:17:37 -06:00
Peter Scheibel
c724e26ba9
Staging: determine extensions from nonstandard URLs (#31027)
Fixes #31021

With #25185, we no longer default to using tar when we can't
determine the extension type, opting to fail instead.

This broke fetching for the pcre package, where we couldn't determine
the extension. To determine the extension, we were attempting to
extract it from the destination filename; however, this file name
may omit details of the origin URL that are required to determine the
extension, so instead we examine the URL directly.

This also updates the decompressor_for method not to set ext=None
by default: it must now always be set by the caller.
2022-06-07 14:12:08 -07:00
Massimiliano Culpo
6b4b1dacd9
docs: update the list of Docker images with Spack preinstalled (#31003)
Also, update the image in the docs and use ghcr.io
2022-06-07 16:43:04 +02:00
Jordan Galby
e74d85a524
Fix empty install prefix post-install sanity check (#30983) 2022-06-07 16:17:33 +02:00
Massimiliano Culpo
4a0ac87d07
archspec: bump to v0.1.4 (#30856)
Fixes compiler flags for oneapi and dpcpp
2022-06-07 08:51:34 +00:00
John W. Parent
5b45df5269
Update decompression support on Windows (#25185)
Most package installations include compressed source files. This
adds support for common archive types on Windows:

* Add support for using system 7zip functionality to decompress .Z
  files when available (and on Windows, use 7zip for .xz archives)
* Default to using built-in Python support for tar/bz2 decompression
  (note that Python tar documentation mentions preservation of file
  permissions)
* Add tests for decompression support
* Extract logic for handling exploding archives (i.e. compressed
  archives that expand to more than one base file) into an
  exploding_archive_catch context manager in the filesystem module
2022-06-06 18:14:43 -07:00
Chuck Atkins
9d7cc43673
Package: Don't warn for missing source on bundle packages without code (#30913) 2022-06-06 15:33:03 -07:00
John W. Parent
13b0e73a4e
Sanitize filepath from URL (#30625)
Spack's staging logic constructs a file path based on a URL. The URL
may contain characters which are not allowed in valid file paths on
the system (e.g. Windows prohibits ':' and '?' among others). This
commit adds a function to remove such offending characters (but
otherwise preserves the URL string when constructing a file path).
2022-06-04 15:06:43 -07:00
Adam J. Stewart
5728ba0122
Use stable URLs for patch-diff GitHub patches (#30953) 2022-06-02 12:52:05 -04:00
Robert Cohn
f3af38ba9b
Fix module support for oneapi compilers (#28901)
Updates to improve Spack-generated modules for Intel oneAPI compilers:

* intel-oneapi-compilers set CC etc.
* Add a new package intel-oneapi-compilers-classic which can be used to
  generate a module which sets CC etc. to older compilers (e.g. icc)
* lmod module logic now updated to treat the intel-oneapi-compilers*
  packages as compilers
2022-05-31 15:02:25 -07:00
Adam J. Stewart
055c9d125d
CUDA: make cuda_arch sticky (#30910) 2022-05-30 12:53:15 -07:00
Todd Gamblin
e6929b9ff9
0.18.0.dev0 -> 0.19.0.dev0 (#30907) 2022-05-28 17:23:01 +00:00
Tom Scogland
18c2f1a57a
refactor: packages import spack.package explicitly (#30404)
Explicitly import package utilities in all packages, and corresponding fallout.

This includes:

* rename `spack.package` to `spack.package_base`
* rename `spack.pkgkit` to `spack.package`
* update all packages in builtin, builtin_mock and tutorials to include `from spack.package import *`
* update spack style
  * ensure packages include the import
  * automatically add the new import and remove any/all imports of `spack` and `spack.pkgkit`
    from packages when using `--fix`
  * add support for type-checking packages with mypy when SPACK_MYPY_CHECK_PACKAGES
    is set in the environment
* fix all type checking errors in packages in spack upstream
* update spack create to include the new imports
* update spack repo to inject the new import, injection persists to allow for a deprecation period

Original message below:
 
As requested @adamjstewart, update all packages to use pkgkit.  I ended up using isort to do this,
so repro is easy:

```console
$ isort -a 'from spack.pkgkit import *' --rm 'spack' ./var/spack/repos/builtin/packages/*/package.py
$ spack style --fix
```

There were several line spacing fixups caused either by space manipulation in isort or by packages
that haven't been touched since we added requirements, but there are no functional changes in here.

* [x] add config to isort to make sure this is maintained going forward
2022-05-28 12:55:44 -04:00
Greg Becker
19087c9d35
target optimization: re-norm optimization scale so that 0 is best. (#29926)
referred targets are currently the only minimization criteria for Spack for which we allow
negative values. That means Spack may be incentivized to add nodes to the DAG if they
match the preferred target.

This PR re-norms the minimization criteria so that preferred targets are weighted from 0,
and default target weights are offset by the number of preferred targets per-package to
calculate node_target_weight.

Also fixes a bug in the test for preferred targets that was making the test easier to pass
than it should be.
2022-05-27 22:49:41 -07:00
Greg Becker
4116b04368
update tutorial command for v0.18.0 and new gpg key (#30904) 2022-05-28 02:36:20 +00:00
Scott Wittenburg
3d43ebec72
Revert "strip -Werror: all specific or none (#30284)" (#30878)
This reverts commit 330832c22c.
2022-05-26 14:17:01 -07:00
Massimiliano Culpo
0636fdbfef
Remove the warning that Spack prints at each spec (#30872)
Add instead a warning box in the documentation
2022-05-26 14:35:20 +00:00
Scott Wittenburg
85e13260cf
ci: Support secure binary signing on protected pipelines (#30753)
This PR supports the creation of securely signed binaries built from spack
develop as well as release branches and tags. Specifically:

- remove internal pr mirror url generation logic in favor of buildcache destination
on command line
    - with a single mirror url specified in the spack.yaml, this makes it clearer where 
    binaries from various pipelines are pushed
- designate some tags as reserved: ['public', 'protected', 'notary']
    - these tags are stripped from all jobs by default and provisioned internally
    based on pipeline type
- update gitlab ci yaml to include pipelines on more protected branches than just
develop (so include releases and tags)
    - binaries from all protected pipelines are pushed into mirrors including the
    branch name so releases, tags, and develop binaries are kept separate
- update rebuild jobs running on protected pipelines to run on special runners
provisioned with an intermediate signing key
    - protected rebuild jobs no longer use "SPACK_SIGNING_KEY" env var to
    obtain signing key (in fact, final signing key is nowhere available to rebuild jobs)
    - these intermediate signatures are verified at the end of each pipeline by a new
    signing job to ensure binaries were produced by a protected pipeline
- optionallly schedule a signing/notary job at the end of the pipeline to sign all
packges in the mirror
    - add signing-job-attributes to gitlab-ci section of spack environment to allow
    configuration
    - signing job runs on special runner (separate from protected rebuild runners)
    provisioned with public intermediate key and secret signing key
2022-05-26 08:31:22 -06:00
Todd Gamblin
d51f949768
bugfix: do not compute package_hash for old concrete specs (#30861)
Old concrete specs were slipping through in `_assign_hash`, and `package_hash` was
attempting to recompute a package hash when we could not know the package a time
of concretization.

Part of this was that the logic for `_assign_hash` was hard to understand -- it was
called twice from `_finalize_concretization` and had special cases for both args it
was called with. It's much easier to understand the logic here if we just inline it.

- [x] Get rid of `_assign_hash` and just integrate it with `_finalize_concretization`
- [x] Don't call `_package_hash` at all for already-concrete specs.
- [x] Add regression test.
2022-05-26 03:12:24 +00:00
Scott Wittenburg
70824e4a5e
buildcache: Update layout and signing (#30750)
This PR introduces a new build cache layout and package format, with improvements for
both efficiency and security.

## Old Format
Currently a binary package consists of a `spec.json` file at the root and a `.spack` file,
which is a `tar` archive containing a copy of the `spec.json` format, possibly a detached
signature (`.asc`) file, and a tar-gzip compressed archive containing the install tree.

```
build_cache/
  # metadata (for indexing)
  <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spec.json
  <arch>/
    <compiler>/
      <name>-<ver>/
        # tar archive
        <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spack
          # tar archive contents:
          # metadata (contains sha256 of internal .tar.gz)
          <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spec.json
          # signature
          <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spec.json.asc
          # tar.gz-compressed prefix
          <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.tar.gz
```

After this change, the nesting has been removed so that the `.spack` file is the
compressed archive of the install tree.  Now signed binary packages, will take the
form of a clearsigned `spec.json` file (a `spec.json.sig`) at the root, while unsigned
binary packages will contain a `spec.json` at the root.

## New Format

```
build_cache/
  # metadata (for indexing, contains sha256 of .spack file)
  <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spec.json
  # clearsigned spec.json metadata
  <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spec.json.sig
  <arch>/
    <compiler>/
      <name>-<ver>/
        # tar.gz-compressed prefix (may support more compression formats later)
        <arch>-<compiler>-<name>-<ver>-24zvipcqgg2wyjpvdq2ajy5jnm564hen.spack
```

## Benefits
The major benefit of this change is that the signatures on binary packages can be
verified without:

1. Having to download the tarball, or
2. having to extract an unknown tarball.

(1) is an improvement in efficiency; (2) is a security fix: we now ensure that we trust the
binary before we try to run it through `tar`, which avoids potential attacks.

## Backward compatibility
Also after this change, spack should still be able to handle the previous buildcache
structure and binary mirrors with mixed layouts.
2022-05-24 17:39:20 -04:00
Massimiliano Culpo
ba907defca
Add a command to generate a local mirror for bootstrapping (#28556)
This PR builds on #28392 by adding a convenience command to create a local mirror that can be used to bootstrap Spack. This is to overcome the inconvenience in setting up this mirror manually, which has been reported when trying to setup Spack on air-gapped systems.

Using this PR the user can create a bootstrapping mirror, on a machine with internet access, by:

% spack bootstrap mirror --binary-packages /opt/bootstrap
==> Adding "clingo-bootstrap@spack+python %apple-clang target=x86_64" and dependencies to the mirror at /opt/bootstrap/local-mirror
==> Adding "gnupg@2.3: %apple-clang target=x86_64" and dependencies to the mirror at /opt/bootstrap/local-mirror
==> Adding "patchelf@0.13.1:0.13.99 %apple-clang target=x86_64" and dependencies to the mirror at /opt/bootstrap/local-mirror
==> Adding binary packages from "https://github.com/alalazo/spack-bootstrap-mirrors/releases/download/v0.1-rc.2/bootstrap-buildcache.tar.gz" to the mirror at /opt/bootstrap/local-mirror

To register the mirror on the platform where it's supposed to be used run the following command(s):
  % spack bootstrap add --trust local-sources /opt/bootstrap/metadata/sources
  % spack bootstrap add --trust local-binaries /opt/bootstrap/metadata/binaries
The mirror has to be moved over to the air-gapped system, and registered using the commands shown at prompt. The command has options to:

1. Add pre-built binaries downloaded from Github (default is not to add them)
2. Add development dependencies for Spack (currently the Python packages needed to use spack style)

* bootstrap: refactor bootstrap.yaml to move sources metadata out

* bootstrap: allow adding/removing custom bootstrapping sources

This operation can be performed from the command line since
new subcommands have been added to `spack bootstrap`

* Add --trust argument to spack bootstrap add

* Add a command to generate a local mirror for bootstrapping

* Add a unit test for mirror creation
2022-05-24 21:33:52 +00:00
Massimiliano Culpo
f2a81af70e
Best effort co-concretization (iterative algorithm) (#28941)
Currently, environments can either be concretized fully together or fully separately. This works well for users who create environments for interoperable software and can use `concretizer:unify:true`. It does not allow environments with conflicting software to be concretized for maximal interoperability.

The primary use-case for this is facilities providing system software. Facilities provide multiple MPI implementations, but all software built against a given MPI ought to be interoperable.

This PR adds a concretization option `concretizer:unify:when_possible`. When this option is used, Spack will concretize specs in the environment separately, but will optimize for minimal differences in overlapping packages.

* Add a level of indirection to root specs

This commit introduce the "literal" atom, which comes with
a few different "arities". The unary "literal" contains an
integer that id the ID of a spec literal. Other "literals"
contain information on the requests made by literal ID. For
instance zlib@1.2.11 generates the following facts:

literal(0,"root","zlib").
literal(0,"node","zlib").
literal(0,"node_version_satisfies","zlib","1.2.11").

This should help with solving large environments "together
where possible" since later literals can be now solved
together in batches.

* Add a mechanism to relax the number of literals being solved

* Modify spack solve to display the new criteria

Since the new criteria is above all the build criteria,
we need to modify the way we display the output.

Originally done by Greg in #27964 and cherry-picked
to this branch by the co-author of the commit.

Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* Inject reusable specs into the solve

Instead of coupling the PyclingoDriver() object with
spack.config, inject the concrete specs that can be
reused.

A method level function takes care of reading from
the store and the buildcache.

* spack solve: show output of multi-rounds

* add tests for best-effort coconcretization

* Enforce having at least a literal being solved

Co-authored-by: Greg Becker <becker33@llnl.gov>
2022-05-24 12:13:28 -07:00
Seth R. Johnson
6a57aede57
environments: fail gracefully on missing keys (#26378) 2022-05-24 08:52:40 -07:00
edwardsp
ba701a7cf8
Update regex to correctly identify quoted args (#23494)
Previously the regex was only checking for presence of quotes as a beginning
or end character and not a matching set.  This erroneously identified the
following *single* argument as being quoted:

    source bashenvfile &> /dev/null && python3 -c "import os, json; print(json.dumps(dict(os.environ)))"
2022-05-24 08:26:07 -07:00
Greg Becker
817ee81eaa
compiler flags: imposed hashes impose the lack of additional compiler flags (#30797) 2022-05-24 01:22:29 -04:00
Tom Scogland
330832c22c
strip -Werror: all specific or none (#30284)
Add a config option to strip `-Werror*` or `-Werror=*` from compile lines everywhere.

```yaml
config:
    keep_werror: false
```

By default, we strip all `-Werror` arguments out of compile lines, to avoid unwanted
failures when upgrading compilers.  You can re-enable `-Werror` in your builds if
you really want to, with either:

```yaml
config:
    keep_werror: all
```

or to keep *just* specific `-Werror=XXX` args:

```yaml
config:
    keep_werror: specific
```

This should make swapping in newer versions of compilers much smoother when
maintainers have decided to enable `-Werror` by default.
2022-05-24 00:57:09 -04:00
Todd Gamblin
306bed48d7
specs: emit better parsing errors for specs. (#24860)
Parse error information is kept for specs, but it doesn't seem like we propagate it
to the user when we encounter an error.  This fixes that.

e.g., for this error in a package:

```python
    depends_on("python@:3.8", when="0.900:")
```

Before, with no context and no clue that it's even from a particular spec:

```
==> Error: Unexpected token: ':'
```

With this PR:

```
==> Error: Unexpected token: ':'
  Encountered when parsing spec:
    0.900:
         ^
```
2022-05-24 03:33:43 +00:00
Greg Becker
8616ba04db
Documentation and new method for CachedCMakePackage build system (#22706)
Co-authored-by: Axel Huebl <axel.huebl@plasma.ninja>
2022-05-23 22:48:12 +00:00
Massimiliano Culpo
7c4cc1c71c
archspec: add oneapi and dpcpp flag support (#30783) 2022-05-23 13:28:54 -07:00
Harmen Stoppels
f7258e246f
Deprecate spack:concretization over concretizer:unify (#30038)
* Introduce concretizer:unify option to replace spack:concretization

* Deprecate concretization

* Make spack:concretization overrule concretize:unify for now

* Add environment update logic to move from spack:concretization to spack:concretizer:reuse

* Migrate spack:concretization to spack:concretize:unify in all locations

* For new environments make concretizer:unify explicit, so that defaults can be changed in 0.19
2022-05-23 13:20:34 -07:00
Glenn Johnson
d688a699fa
Fix toolchain detection for oneapi/dpcpp compilers (#30775)
The oneapi and dpcpp compilers are essentially the same except for which
binary is used foc CXX. Spack will detect them as "mixed toolchain" and
not inject compiler optimization flags. This will be needed once
archspec has entries for the oneapi and dpcpp compilers. This PR detects
when dpcpp and oneapi are in the toolchains list and explicitly sets
`is_mixed_toolchain` to `False`.
2022-05-21 08:38:01 +02:00
Greg Becker
ee04a1ab0b
errors: model error messages as an optimization problem (#30669)
Error messages for the clingo concretizer have proven challenging. The current messages are incredibly vague and often don't help users at all. Unsat cores in clingo are not guaranteed to be minimal, and lead to cores that are either not useful or need to be post-processed for hours to reach a minimal core.

Following up on an idea from a slack conversation with kwryankrattiger on slack, this PR takes a new approach. We eliminate most integrity constraints and minima/maxima on choice rules in clingo, and instead force invalid states to imply an error predicate. The error predicate can include context on the cause of the error (Package, Version, etc). These error predicates are then heavily optimized against, to ensure that we do not include error facts in the solution when a solution with no error facts could be generated. When post-processing the clingo solution to construct specs, any error facts cause the program to raise an exception. This leads to much more legible error messages. Each error predicate includes a priority and an error message. The error message is formatted by the remaining arguments to produce the error message. The priority is used to ensure that when clingo has a choice of which rules to violate, it chooses the one which will be most informative to the user.

Performance:

"fresh" concretizations appear to suffer a ~20% performance penalty under this branch, while "reuse" concretizations see a speedup of around 33%. 

Possible optimizations if users still see unhelpful messages:

There are currently 3 levels of priority of the error messages. Additional priorities are possible, and can allow us finer granularity to ensure more informative error messages are provided in lieu of less informative ones.

Future work:

Improve tests to ensure that every possible rule implying an error message is exercised
2022-05-20 08:27:07 -07:00
Jordan Galby
262c3f07bf
Non-existent upstream is not fatal (#30746)
A non-existent upstream should not be fatal: it could only mean it is
not deployed yet. In the meantime, it should not block the user to
rebuild anything it needs.

A warning is still emitted, to let the user decide if this is ok or not.
2022-05-19 18:27:43 +00:00
Jordan Galby
c2fd98ccd2
Fix spack install chgrp on symlinks (#30743)
Fixes missing chgrp on symlinks in package installations, and errors on
symlinks referencing non-existent or non-writable locations.

Note: `os.chown(.., follow_symlinks=False)` is python3 only, but
`os.lchown` exists in both versions.
2022-05-19 08:50:24 -07:00
Jordan Galby
8fe39be3df
Don't try to mkdir upstream directory when nonexistent (#30744)
When an upstream is specified but the directory does not exist, don't
create the directory for it, it might not be yours.
2022-05-19 14:45:18 +00:00
robgics
1f6b880fff
Add license dir to config (#30135)
* Change license dir from hard-coded to a configurable item

* Change config item to be a string not an array

Co-authored-by: Todd Gamblin <tgamblin@llnl.gov>
2022-05-18 18:26:42 -07:00
Todd Gamblin
8ff2b4b747
bugfix: handle new dag_hash() on old concrete specs gracefully. (#30678)
Trying to compute `dag_hash()` or `package_hash()` on a concrete spec that doesn't have
a `_package_hash` attribute would attempt to recompute the package hash.

This most commonly manifests as a failed lookup of a namespace if you attempt to uninstall
or compute the hashes of packages in exsternal repositories that aren't registered, e.g.:

```console
> spack spec --json c/htno
==> Error: Unknown namespace: myrepo
```

While it wouldn't change the already-assigned `dag_hash` value, this behavior is
incorrect, since the package file for a previously concrete spec:
  1. might have changed since concretization,
  2. might not exist anymore, or
  3. might just not be findable by Spack.

This PR ensures that the package hash can't be computed on older concrete specs. Instead
of calling `package_hash()` from within `to_node_dict()`, we now check for the `_package_hash`
attribute and only add the package_hash to the spec record if it's there.

This PR also handles the tricky semantics of computing `package_hash()` at concretization
time. We have to compute it *before* marking the spec concrete so that `to_node_dict` can
use it. But this means that the logic for `package_hash()` can't rely on `spec.concrete`,
as it is called *during* concretization. Instead of checking for concreteness, `package_hash()`
now checks `_patches_assigned()` to determine whether it should add them to the package
hash.

- [x] Add an assert to `package_hash()` so it can't be called on specs for which it
      would be wrong.
- [x] Add an `_assign_hash()` method to handle tricky semantics of `package_hash`
      and `dag_hash`.
- [x] Rework concretization to call `_assign_hash()` before and after marking specs
      concrete.
- [x] Rework content hash part of package hash to check for `_patches_assigned()`
      instead of `spec.concrete`.
- [x] regression test
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