The cloud package intends to implement a new integration for
Terraform Cloud/Enterprise. The purpose of this integration is to better
support TFC users; it will shed some overly generic UX and architecture,
behavior changes that are otherwise backwards incompatible in the remote
backend, and technical debt - all of which are vestiges from before
Terraform Cloud existed.
This initial commit is largely a porting of the existing 'remote'
backend, which will serve as an underlying implementation detail and not
be a typical user-level backend. This is because to re-implement the
literal backend interface is orthogonal to the purpose of this
integration, and can always be migrated away from later.
As this backend is considered an implementation detail, it will not be
registered as a declarable backend. Within these changes it is, for easy
of initial development and a clean diff.
When running `terraform init` against a backend with multiple
workspaces, none of which are the currently indicated local workspace,
Terraform prompts the user to choose a workspace from the list. In
automation, using the `-input=false` argument should disable asking for
input, but previously would hang instead.
When an explicit backend is configured with a configuration which has
not yet been initialized, running `terraform init` performs a state
migration to fetch the remotely stored state in order to operate on it.
Like the previous bug introduced by the recent provider diagnostics
change, this code path was not correctly configured to enable init mode
for the backend, which resulted in a fatal error during init when the
cache dir is deleted.
Setting the `Init` backend option allows this code path to continue
without error when first initializing the backend for state migration.
The new e2e test fails without this change.
When migrating state to an existing Terraform Cloud workspace using the
remote backend, we check the remote version is compatible with the local
one by default.
This commit fixes two bugs in this code:
- If using the "name" strategy for the remote backend, the list of
destination workspaces is empty. This resulted in no version checking
of the remote workspace, and we fell back to the string equality
check.
- The user-specified CLI flag `-ignore-remote-version` was not being
applied for the state migration version checking.
The init command needs to initialize a backend, in order to access
state, in turn to derive provider requirements from state. The backend
initialization step requires building provider factories, which
previously would fail if a lockfile was present without a corresponding
local provider cache.
This commit ensures that in this situation only, errors with the
provider factories are temporarily ignored. This allows us to continue
to initialize the backend, fetch providers, and then report any errors
as necessary.
We test that a deleted provider cache results in an error when running
terraform plan, but previously did not test that running init (as
instructed) would resolve the issue. This (failing) e2e test adds that
step.
We introduced this experiment to gather feedback, and the feedback we saw
led to us deciding to do another round of design work before we move
forward with something to meet this use-case.
In addition to being experimental, this has only been included in alpha
releases so far, and so on both counts it is not protected by the
Terraform v1.0 Compatibility Promises.
The -lock and -lock-timeout flags were removed prior to the release of
1.0 as they were thought to have no effect. This is not true in the case
of state migrations when changing backends. This commit restores these
flags, and adds test coverage for locking during backend state
migration.
Also update the help output describing other boolean flags, showing the
argument as the user would type it rather than the default behavior.
There is a race between the MockSource and ShutdownCh which sometimes
causes this test to fail. Add a HangingSource implementation of Source
which hangs until the context is cancelled, so that there is always time
for a user-initiated shutdown to trigger the cancellation code path
under test.
We don't use this library anywhere else in Terraform, and this backend was
using it only for trivial helpers that are easy to express inline anyway.
The new direct code is also type-checkable, whereas these helper functions
seem to be written using reflection.
This gives us one fewer dependency to worry about and makes the test code
for this backend follow a similar assertions style as the rest of this
codebase.
This also transitively upgrades golang.org/x/sys and golang.org/x/net,
but there do not seem to be any significant changes compared to the
commits we were previously using.
Ensure that we still check for a stale plan even when it was created
with no previous state.
Create separate errors for incorrect lineage vs incorrect serial.
To prevent confusion when applying a first plan multiple times, only
report it as a stale plan rather than different lineage.
Previously we would reject attempts to delete a workspace if its state
contained any resources at all, even if none of the resources had any
resource instance objects associated with it.
Nowadays there isn't any situation where the normal Terraform workflow
will leave behind resource husks, and so this isn't as problematic as it
might've been in the v0.12 era, but nonetheless what we actually care
about for this check is whether there might be any remote objects that
this state is tracking, and for that it's more precise to look for
non-nil resource instance objects, rather than whole resources.
This also includes some adjustments to our error messaging to give more
information about the problem and to use terminology more consistent with
how we currently talk about this situation in our documentation and
elsewhere in the UI.
We were also using the old State.HasResources method as part of some of
our tests. I considered preserving it to avoid changing the behavior of
those tests, but the new check seemed close enough to the intent of those
tests that it wasn't worth maintaining this method that wouldn't be used
in any main code anymore. I've therefore updated those tests to use
the new HasResourceInstanceObjects method instead.
When a test uses multiple instances of the same provider, we may need to
have separate objects to prevent overwriting of the MockProvider state.
Create a completely new MockProvider in each factory function call
rather than re-using the original provider value.
Running the tool this way ensures that we'll always run the version
selected by our go.mod file, rather than whatever happened to be available
in $GOPATH/bin on the system where we're running this.
This change caused some contexts to now be using a newer version of
staticcheck with additional checks, and so this commit also includes some
changes to quiet the new warnings without any change in overall behavior.
A snapshotDir tracks its current position as part of its state, so we need
to use it via pointer rather than value so that Readdirnames can actually
update that position, or else we'll just get stuck at position zero.
In practice this wasn't hurting anything because we only call Readdir once
on our snapshots, to read the whole directory at once. Still nice to fix
to avoid a gotcha for future maintenence, though.
Make the state match the fixture config. The old test was not
technically invalid, but because it caused multiple instances of the
provider to be created, they were backed by the same MockProvider value
resulting in the `*Called` fields interfering.
CVE-2020-26160 is a high-severity advisory reported against this module.
The dgrijalva package is no longer maintained but our legacy etcv2 backend
depends on it indirectly, via go.etcd.io/etcd/client. The golang-jwt
package is the blessed successor of the original, and has a v3 line which
is compatible with the v3 line of dgrijalva, and so through this replace
we can get a fix for the advisory without other significant behavior
change.
We've preserved the etcdv2 backend as-is on a best-effort basis in order
to support anyone who is already using it, but recommend that users switch
to etcdv3 or to some other backend for ongoing use.
We also have future plans to make state storage be a matter for provider
plugins rather than built in to Terraform CLI, at which point this backend
will either become obsolete or be factored out into its own plugin, at
which point we can remove this "replace" directive and the associated
dependency altogether.
