Previously we relied on a constellation of coincidences for everything to
work out correctly with state serials. In particular, callers needed to
be very careful about mutating states (or not) because many different bits
of code shared pointers to the same objects.
Here we move to a model where all of the state managers always use
distinct instances of state, copied when WriteState is called. This means
that they are truly a snapshot of the state as it was at that call, even
if the caller goes on mutating the state that was passed.
We also adjust the handling of serials so that the state managers ignore
any serials in incoming states and instead just treat each Persist as
the next version after what was most recently Refreshed.
(An exception exists for when nothing has been refreshed, e.g. because
we are writing a state to a location for the first time. In that case
we _do_ trust the caller, since the given state is either a new state
or it's a copy of something we're migrating from elsewhere with its
state and lineage intact.)
The intent here is to allow the rest of Terraform to not worry about
serials and state identity, and instead just treat the state as a mutable
structure. We'll just snapshot it occasionally, when WriteState is called,
and deal with serials _only_ at persist time.
This is intended as a more robust version of #15423, which was a quick
hotfix to an issue that resulted from our previous slopping handling
of state serials but arguably makes the problem worse by depending on
an additional coincidental behavior of the local backend's apply
implementation.
Skips checksum validation if the `TF_SKIP_PROVIDER_VERIFY` environment variable is set. Undocumented variable, as the primary goal is to significantly improve the local provider development workflow.
We need to release the lock just before deleting the state, in case the backend
can't remove the resource while holding the lock. This is currently true for
Windows local files.
TODO: While there is little safety in locking while deleting the state, it
might be nice to be able to coordinate processes around state deletion, i.e. in
a CI environment. Adding Delete() as a required method of States would allow
the removal of the resource to be delegated from the Backend to the State
itself.
A common reason to want to use `terraform plan` is to have a chance to
review and confirm a plan before running it. If in fact that is the
only reason you are running plan, this new `terraform apply -auto-approve=false`
flag provides an easier alternative to
P=$(mktemp -t plan)
terraform refresh
terraform plan -refresh=false -out=$P
terraform apply $P
rm $P
The flag defaults to true for now, but in a future version of Terraform it will
default to false.
The import command wasn't loading the full plugin path for discovery.
Run a basic plugin init sequence, and verify we can find a plugin (even
though the plugin is invalid and will fail).
The import command wasn't loading the plugin path at all, relying on the
local directory for binaries.
Load the plugin dir into Meta, and pass in ForceLocal for consistency.
The Backend returned was going to be a Local anyway, so the added check
wasn't ensuring anything.
The "confirm" method was directly checking the meta struct's input field,
but that only represents the -input command line flag, and doesn't
respect the TF_INPUT environment variable.
By calling the Input method instead, we check both.
This fixes#15338.
When using a `state` command, if the `-state` flag is provided we do not
want to modify the Backend state. In this case we should always create a
local state instance.
The backup flag was also being ignored, and some tests were relying on
that, which have been fixed.
If we provide a -state flag to a state command, we do not want terraform
to modify the backend state. This test fails since the state specified
in the backend doesn't exist
Remove "checksum" from the error, and only indicate that the plugin has
changed.
Always show requested versions even if it's "any", and found versions of
plugins.
This change makes various minor adjustments to the rendering of plans
in the output of "terraform plan":
- Resources are identified using the standard resource address syntax,
rather than exposing the legacy internal representation used in the
module diff resource keys. This fixes#8713.
- Subjectively, having square brackets in the addresses made it look more
visually "off" when the same name but with different indices were
shown together with differing-length "symbols", so the symbols are now
all padded and right-aligned to three characters for consistent layout
across all operations.
- The -/+ action is now more visually distinct, using several different
colors to help communicate what it will do and including a more obvious
"(new resource required)" marker to help draw attention to this not
being just an update diff. This fixes#15350.
- The resources are now sorted in a manner that sorts index [10] after
index [9], rather than after index [1] as we did before. This makes it
easier to scan the list and avoids the common confusion where it seems
that there are only 10 items when in fact there are 11-20 items with
all the tens hiding further up in the list.
Previously init would crash if given these options:
-backend=false -get-plugins=true
This is because the state is used as a source of provider dependency
information, and we need to instantiate the backend to get the state.
To avoid the crash, we now use the following adjusted behavior:
- if -backend=true, we behave as before
- if -backend=false, we instead try to instantiate the backend the same
way any other command would, without modifying its configuration
- if we're able to instantiate the backend, we use it to fetch state
for dependency resolution purposes
- if the backend is not instantiable then we assume it's not yet
configured and proceed with a nil state, which may cause us to see an
incomplete picture of the dependencies but still allows the install
to succeed. Subsequently running "terraform plan" will not work until
the backend is (re-)initialized, so the incomplete picture of required
plugins is safe.
This takes care of a few dangling cases where we were still stringifying
empty version constraints, which creates confusing error messages due to
it stringing as the empty string.
For the "no suitable versions available" message, we fall back on the
"provider not found" message if no versions were found even though it's
unconstrained. This should only happen in an edge case where the
provider's index page exists on the releases server but no versions are
yet present.
For the message about plugin protocol versions, this again is an edge
case since with no constraints this should happen only if we release
an incompatible Terraform version but don't release a new version of the
plugin that's compatible. In this case we just show the constraint as
"(any version)" to make sure we always show _something_.
Previously we only did this when _upgrading_, but that's unnecessarily
specific and confusing since e.g. plugins can get upgraded implicitly by
constraint changes, which would not then trigger the purge process.
Instead, we'll assume that the user is able to easily re-download plugins
that were purged here, or if they need more specific guarantees they will
manage manually a plugin directory and disable the auto-install behavior
using `-plugin-dir`.
Now we are able to recognize and handle a few special error situations
from plugin installation with more verbose error messages that give the
user better feedback on how to proceed.
The -plugin-dir option lets the user specify custom search paths for
plugins. This overrides all other plugin search paths, and prevents the
auto-installation of plugins.
We also make sure that the availability of plugins is always checked
during init, even if -get-plugins=false or -plugin-dir is set.
init should always write intternal data to the current directory, even
when a path is provided. The inherited behavior no longer applies to the
new use of init.
Now that init can take a directory for configuration, the old behavior
of writing the .terraform data directory into the target path no longer
makes sense. Don't change the dataDir field during init, and write to
the default location.
Clean up all references to Meta.dataDir, and only use the getter method
in case we chose to dynamically override this at some point.
Now when -upgrade is provided to "terraform init" (and plugin installation
isn't disabled) it will:
- ignore the contents of the auto-install plugin directory when deciding
what is "available", thus causing anything there to be reinstalled,
possibly at a newer version.
- if installation completes successfully, purge from the auto-install
plugin directory any plugin-looking files that aren't in the set of
chosen plugins.
As before, plugins outside of the auto-install directory are able to
take precedence over the auto-install ones, and these will never be
upgraded nor purged.
The thinking here is that the auto-install directory is an implementation
detail directly managed by Terraform, and so it's Terraform's
responsibility to automatically keep it clean as plugins are upgraded.
We don't yet have the -plugin-dir option implemented, but once it is it
should circumvent all of this behavior and just expect providers to be
already available in the given directory, meaning that nothing will be
auto-installed, -upgraded or -purged.
Previously we had a "getProvider" function type used to implement plugin
fetching. Here we replace that with an interface type, initially with
just a "Get" function.
For now this just simplifies the interface by allowing the target
directory and protocol version to be members of the struct rather than
passed as arguments.
A later change will extend this interface to also include a method to
purge unused plugins, so that upgrading frequently doesn't leave behind
a trail of unused executable files.
As of this commit this just upgrades modules, but this option will also
later upgrade plugins and indeed anything else that's being downloaded and
installed as part of the init.
Since there is little left that isn't core, remove the distinction for
now to reduce confusion, since a "core" binary will mostly work except
for provisioners.
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.
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.
When init was modified in 0.9 to initialize a terraform working
directory, the legacy behavior was kept to copy or fetch module sources.
This left the init command without the ability that the plan and apply
commands have to target a specific directory for the operation.
This commit removes the legacy behavior altogether, and allows init to
target a directory for initialization, bringing it into parity with plan
and apply. If one want to copy a module to the target or current
directory, that will have to be done manually before calling init. We
can later reintroduce fetching modules with init without breaking this
new behavior, by adding the source as an optional second argument.
The unit tests testing the copying of sources with init have been
removed, as well as some out of date (and commented out) init tests
regarding remote states.
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.
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.
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.
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.
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.
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.
Previously we encouraged users to import a resource and _then_ write the
configuration block for it. This ordering creates lots of risk, since
for various reasons users can end up subsequently running Terraform
without any configuration in place, which then causes Terraform to want
to destroy the resource that was imported.
Now we invert this and require a minimal configuration block be written
first. This helps ensure that the user ends up with a correlated resource
config and state, protecting against any inconsistency caused by typos.
This addresses #11835.
Previously we deferred validation of the resource address on the import
command until we were in the core guts, which caused the error responses
to be rather unhelpful.
By validating these things early we can give better feedback to the user.
For some reason there was a block of commented-out tests for the refresh
command in the test file for the import command. Here we remove them to
reduce the noise in this file.
Add discovery.GetProviders to fetch plugins from the relases site.
This is an early version, with no tests, that only (probably) fetches
plugins from the default location. The URLs are still subject to change,
and since there are no plugin releases, it doesn't work at all yet.
Instead of providing the a path in BackendOpts, provide a loaded
*config.Config instead. This reduces the number of places where
configuration is loaded.
This new command prints out the tree of modules annotated with their
associated required providers.
The purpose of this command is to help users answer questions such as
"why is this provider required?", "why is Terraform using an older version
of this provider?", and "what combination of modules is creating an
impossible provider version situation?"
For configurations using many modules this sort of question is likely to
come up a lot once we support versioned providers.
As a bonus use-case, this command also shows explicitly when a provider
configuration is being inherited from a parent module, to help users to
understand where the configuration is coming from for each module when
some child modules provide their own provider configurations.
We're going to use config to determine provider dependencies, so we need
to always provide a config when instantiating a context or we'll end up
loading no providers at all.
We previously had a test for running "terraform import -config=''" to
disable the config entirely, but this test is now removed because it makes
no sense. The actual functionality its testing still remains for now,
but it will be removed in a subsequent commit when we start requiring that
a resource to be imported must already exist in configuration.
Rather than providing an already-resolved map of plugins to core, we now
provide a "provider resolver" which knows how to resolve a set of provider
dependencies, to be determined later, and produce that map.
This requires the context to be instantiated in a different way, so this
very noisy diff is a mostly-mechanical update of all of the existing
places where contexts get created for testing, using some adapted versions
of the pre-existing utilities for passing in mock providers.
Previously the set of providers was fixed early on in the command package
processing. In order to be version-aware we need to defer this work until
later, so this interface exists so we can hold on to the possibly-many
versions of plugins we have available and then later, once we've finished
determining the provider dependencies, select the appropriate version of
each provider to produce the final set of providers to use.
This commit establishes the use of this new mechanism, and thus populates
the provider factory map with only the providers that result from the
dependency resolution process.
This disables support for internal provider plugins, though the
mechanisms for building and launching these are still here vestigially,
to be cleaned up in a subsequent commit.
This also adds a new awkward quirk to the "terraform import" workflow
where one can't import a resource from a provider that isn't already
mentioned (implicitly or explicitly) in config. We will do some UX work
in subsequent commits to make this behavior better.
This breaks many tests due to the change in interface, but to keep this
particular diff reasonably easy to read the test fixes are split into
a separate commit.
Currently this doesn't matter much, but we're about to start checking the
availability of providers early on and so we need to use the correct name
for the mock set of providers we use in command tests, which includes
only a provider named "test".
Without this change, the "push" tests will begin failing once we start
verifying this, since there's no "aws" provider available in the test
context.
Having this as a method of PluginMeta felt most natural, but unfortunately
that means that discovery must depend on plugin and plugin in turn
depends on core Terraform, thus making the discovery package hard to use
without creating dependency cycles.
To resolve this, we invert the dependency and make the plugin package be
responsible for instantiating clients given a meta, using a top-level
function.
Previously we did plugin discovery in the main package, but as we move
towards versioned plugins we need more information available in order to
resolve plugins, so we move this responsibility into the command package
itself.
For the moment this is just preserving the existing behavior as long as
there are only internal and unversioned plugins present. This is the
final state for provisioners in 0.10, since we don't want to support
versioned provisioners yet. For providers this is just a checkpoint along
the way, since further work is required to apply version constraints from
configuration and support additional plugin search directories.
The automatic plugin discovery behavior is not desirable for tests because
we want to mock the plugins there, so we add a new backdoor for the tests
to use to skip the plugin discovery and just provide their own mock
implementations. Most of this diff is thus noisy rework of the tests to
use this new mechanism.
Before this, invoking this codepath would print
Terraform has successfully migrated from legacy remote state to your
configured remote state.%!(EXTRA string=s3)
* core/providersplit: Split OPC Provider to separate repo
As we march towards Terraform 0.10.0, we are going to start building the
terraform providers as separate binaries - this will allow us to
continually release them. Before we go to 0.10.0, we need to be able to
continue building providers in the same manner, therefore, we have
hardcoded the path of the provider in the generate-plugins.go file
The interim solution will require us to vendor the opc provider and any
child dependencies, but when we get to 0.10.0, we will no longer have to
do this - the core will auto download the plugin binary. The plugin
package will have it's own dependencies vendored as well.
* core/providersplit: Removing the builtin version of OPC provider
* core/providersplit: Vendoring the OPC plugin
* core/providersplit: update internal plugin list
* core/providersplit: remove unused govendor item
Looking through the operations in node_resource_apply and
node_resource_destroy, there are multiple nil checks for diffApply, so
one we need to continue to assume that the diff can be nil through there
until we ensure that it is non-nill in all cases.
So regardless of how we came to get a nil diff in the UiHook PreApply
method, we need to check it.
Martin Atkins