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spack env activate: create & activate default environment without args (#40756)

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This PR implements the concept of "default environment", which doesn't have to be
created explicitly. The aim is to lower the barrier for adopting environments.

To (create and) activate the default environment, run

```
$ spack env activate
```

This mimics the behavior of

```
$ cd
```

which brings you to your home directory.

This is not a breaking change, since `spack env activate` without arguments
currently errors. It is similar to the already existing `spack env activate --temp`
command which always creates an env in a temporary directory, the difference
is that the default environment is a managed / named environment named `default`.

The name `default` is not a reserved name, it's just that `spack env activate`
creates it for you if you don't have it already.

With this change, you can get started with environments faster:

```
$ spack env activate [--prompt]
$ spack install --add x y z
```

instead of

```
$ spack env create default
==> Created environment 'default in /Users/harmenstoppels/spack/var/spack/environments/default
==> You can activate this environment with:
==>   spack env activate default
$ spack env activate [--prompt] default 
$ spack install --add x y z
```

Notice that Spack supports switching (but not stacking) environments, so the
parallel with `cd` is pretty clear:

```
$ spack env activate named_env
$ spack env status
==> In environment named_env
$ spack env activate
$ spack env status
==> In environment default
```
This commit is contained in:
Harmen Stoppels
2023-11-06 07:53:26 +01:00
committed by GitHub
parent 141c7de5d8
commit 3c641c8509
5 changed files with 51 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
share/spack/qa/setup-env-test.fish
View File

@@ -371,7 +371,6 @@ spt_contains " spack env list " spack env list --help
title 'Testing `spack env activate`'
spt_contains "No such environment:" spack env activate no_such_environment
spt_contains "env activate requires an environment " spack env activate
spt_contains "usage: spack env activate " spack env activate -h
spt_contains "usage: spack env activate " spack env activate --help
@@ -415,6 +414,11 @@ spt_contains 'spack_test_2_env' 'fish' '-c' 'echo $PATH'
spt_does_not_contain 'spack_test_env' 'fish' '-c' 'echo $PATH'
despacktivate
echo "Testing default environment"
spack env activate
contains "In environment default" spack env status
despacktivate
echo "Correct error exit codes for activate and deactivate"
spt_fails spack env activate nonexisiting_environment
spt_fails spack env deactivate

6
share/spack/qa/setup-env-test.sh
View File

@@ -140,7 +140,6 @@ contains " spack env list " spack env list --help
title 'Testing `spack env activate`'
contains "No such environment:" spack env activate no_such_environment
contains "env activate requires an environment " spack env activate
contains "usage: spack env activate " spack env activate -h
contains "usage: spack env activate " spack env activate --help
@@ -197,6 +196,11 @@ contains "spack_test_2_env" sh -c 'echo $PATH'
does_not_contain "spack_test_env" sh -c 'echo $PATH'
despacktivate
echo "Testing default environment"
spack env activate
contains "In environment default" spack env status
despacktivate
echo "Correct error exit codes for activate and deactivate"
fails spack env activate nonexisiting_environment
fails spack env deactivate