Some initial notes on the core/provider split for those following along with commits.
More elaborate documentation will follow as the 0.10 release gets closer.
We are replacing this terminology. The old command continues to work for
compatibility, but is deprecated. The docs should reflect the
currently-recommended form.
We're shifting terminology from "environment" to "workspace". This takes
care of some of the main internal API surface that was using the old
terminology, though is not intended to be entirely comprehensive and is
mainly just to minimize the amount of confusion for maintainers as we
continue moving towards eliminating the old terminology.
We are moving away from using the term "environment" to describe separate
named states for a single config, using "workspace" instead. The old
attribute name remains supported for backward compatibility, but is
marked as deprecated.
As part of our terminology shift, the interpolation variable for the name
of the current workspace changes to terraform.workspace. The old name
continues to be supported for compatibility.
We can't generate a deprecation warning from here so for now we'll just
silently accept terraform.env as an alias, but not mention it at all in
the error message in the hope that its use phases out over time before we
actually remove it.
Previously we just silently ignored warnings from validating the backend
config, but now that we have a deprecated argument it's important to print
these out so users can respond to the deprecation warning.
Feedback after 0.9 was that the term "environment" was confusing due to
it colliding with several other concepts, such as OS environment
variables, a non-aligned Terraform Enterprise concept, and differing ideas
of "environment" within various organizations.
This new term "workspace" is intended to ease some of that confusion. This
term is not used anywhere else in Terraform today, and we expect it to not
be used in a manner that would be confusing within user organizations.
This begins a deprecation cycle for the "terraform env" family of commands,
instead moving to an equivalent set of "terraform workspace" commands.
There are some remaining references to the old "environment" concept in
the code, which will be cleaned up in a separate change. This change is
instead focused on text visible in the UI and wording within code comments
for the benefit of human maintainers of the code.
This allows you to run multiple concurrent terraform operations against
different environments from the same source directory.
Fixes#14447.
Also removes some dead code which appears to do the same thing as the function I
modified.
ConstrainVersions was documented as returning nil, but it was instead
returning an empty set. Use the Count() method to check for nil or
empty. Add test to verify failed constraints will show up as missing.
"environment" is a very overloaded term, so here we prefer to use the
term "working directory" to talk about a local directory where operations
are executed on a given Terraform configuration.
This form of "terraform init" is vestigial at this point and being phased
out in 0.10. Something similar may return in a later version for
installing modules from a more formal module library, but for now we are
advising to use git manually to simplify the UX for "terraform init".
Each provider plugin will take at least a few seconds to download, so
providing feedback about each one should make users feel less like
Terraform has hung.
Ideally we'd show ongoing progress during the download, but that's not
possible without re-working go-getter, so we'll accept this as an interim
solution for now.
The information stored in a plan is tightly coupled to the Terraform core
and provider plugins that were used to create it, since we have no
mechanism to "upgrade" a plan to reflect schema changes and so mismatching
versions are likely to lead to the "diffs didn't match during apply"
error.
To allow us to catch this early and return an error message that _doesn't_
say it's a bug in Terraform, we'll remember the Terraform version and
plugin binaries that created a particular plan and then require that
those match when loading the plan in order to apply it.
The planFormatVersion is increased here so that plan files produced by
earlier Terraform versions _without_ this information won't be accepted
by this new version, and also that older versions won't try to process
plans created by newer versions.
This was added with the idea of using it to override the SHA256 hashes
to match those hypothetically stored in a plan, but we already have a
mechanism elsewhere for populating context fields from plan fields, so
this is not actually necessary.
When running "terraform init" with providers that are unconstrained, we
will now produce information to help the user update configuration to
constrain for the particular providers that were chosen, to prevent
inadvertently drifting onto a newer major release that might contain
breaking changes.
A ~> constraint is used here because pinning to a single specific version
is expected to create dependency hell when using child modules. By using
this constraint mode, which allows minor version upgrades, we avoid the
need for users to constantly adjust version constraints across many
modules, but make major version upgrades still be opt-in.
Any constraint at all in the configuration will prevent the display of
these suggestions, so users are free to use stronger or weaker constraints
if desired, ignoring the recommendation.
Previously we were using the "semver" library to parse version
constraints, but we switched over to go-version and encapsulated it
inside our own plugin/discovery package to reduce dependency sprawl in
the code.
This particular situation was missed when updating references to the new
path, which meant that our validation code disagreed with the rest of
the code about what is considered a valid version constraint string.
By using the correct function, we ensure that we catch early any invalid
versions.
We can filter the allowed versions and sort them before checking the
protocol version, that way we can just return the first one found
reducing network requests.
Extend the test reslease server to return the protocol version header
and a dummy zip file for the provider.
Test filtering the plugins by plugin protocol version and add a full
GetProvder test.
Get provider needs to be provided with the plugin protocol version,
because it can't be imported here directly.
The plugin url types and methods were confusing; replace them with a few
functions to format the urls.
Once we've installed the necessary plugins, we'll do one more walk of
the available plugins and record the SHA256 hashes of all of the plugins
we select in the provider lock file.
The file we write here gets read when we're building ContextOpts to
initialize the main terraform context, so any command that works with
the context will then fail if any of the provider binaries change.
This is used to mark the plugin protocol version. Currently we actually
just ignore this entirely, since only one protocol version exists anyway.
Later we will need to add checks here to ensure that we only pay attention
to plugins of the right version.
By reading our lock file and passing this into the context, we ensure that
only the plugins referenced in the lock file can be used. As of this
commit there is no way to create that lock file, but that will follow soon
as part of "terraform init".
We also provide a way to force a particular set of SHA256s. The main use
for this is to allow us to persist a set of plugins in the plan and
check the same plugins are used during apply, but it may also be useful
for automated tests.
When set, this information gets passed on to the provider resolver as
part of the requirements information, causing us to reject any plugins
that do not match during initialization.
As well as constraining plugins by version number, we also want to be
able to pin plugins to use specific executables so that we can detect
drift in available plugins between commands.
This commit allows such requirements to be specified, but doesn't yet
specify any such requirements, nor validate them.
Paul Stack