Commit Graph

11 Commits

Author SHA1 Message Date
aqche bcaf7f7ba7 states/statemgr: Properly return error when Unlock detects invalid lock id 2019-11-11 15:24:53 -08:00
Sander van Harmelen 57f6e01830 backend/local: preserve serial and lineage on failure
When failing to write the state, the local backend writes the state to a local file called `errrored.tfstate`. Previously it would do so by creating a new state file which would use a new serial and lineage. By exorting the existing state file and directly assigning the new state, the serial and lineage are preserved.
2019-03-27 16:15:16 +01:00
Martin Atkins 6cb3b0f4cf states/statemgr: Local locks meta is near output path, not input path
This was a mistake while adapting this code from the old state.LocalState.
Since the lock is held on the output file (s.path) the metadata should
live adjacent to that rather than being built from the read path
(s.readPath) that is used only as the initial snapshot on first
instantiation.

This also includes more logging, continuing the trend of other recent
commits in these files. The local state behavior is sufficiently complex
that these trace logs are a great help in debugging issues such as this
one with the wrong files being used or actions being taken in the wrong
order.
2018-11-19 09:02:35 -08:00
Martin Atkins 48601d261d states/statemgr: In Filesystem, back up output file, not input file
The filesystem backend has the option of using a different file for its
initial read.

Previously we were incorrectly writing the contents of that file out into
the backup file, rather than the prior contents of the output file. Now
we will always read the output file in RefreshState in order to decide
what we will back up but then we will optionally additionally read the
input file and prefer its content as the "current" state snapshot.

This is verified by command.TestMetaBackend_planLocalStatePath and
TestMetaBackend_configureNew, which are both now passing.
2018-11-19 09:02:35 -08:00
Martin Atkins ec27526cc3 command: Fix TestMetaBackend_configuredChangeCopy_multiToMulti
This was failing because we now handle the settings for the local backend
a little differently as a result of decoding it with the HCL2 machinery.

Specifically, the backend.State* fields are now assumed to be what is
given in configuration, and any CLI overrides are maintained separately
in OverrideState* fields so that they can be imposed "just in time" in
StatePaths.

This is particularly important because OverrideStatePath (when set) is
used regardless of workspace name, while StatePath is a suitable value
only for the "default" workspace, with others needing to be constructed
from StateWorkspaceDir instead.
2018-11-19 09:02:35 -08:00
Martin Atkins 94510bc1b9 states/statemgr: Migrate, Import, and Export functions
In our recent refactoring of the state manager interfaces we made serial
and lineage management the responsibility of the state managers
themselves, not exposing them at all to most callers, and allowing for
simple state managers that don't implement them at all.

However, we do have some specific cases where we need to preserve these
properly when available, such as migration between backends, and the
"terraform state push" and "terraform state pull" commands.

These new functions and their associated optional interface allow the
logic here to be captured in one place and access via some simple
calls. Separating this from the main interface leaves things simple for
the normal uses of state managers.

Since these functions are mostly just thin wrappers around other
functionality, they are not yet well-tested directly, but will be
indirectly tested through the tests of their callers. A subsequent commit
will add more unit tests here.
2018-11-19 09:02:35 -08:00
James Bardin d707049f72 don't make a backup of a nil state
This makes sure we don't create a backup of an intermediate state if the
first read state was empty.
2018-10-17 09:42:08 -04:00
Martin Atkins b0016e9cf6 command: Allow tests to run to completion without panics or hangs
There are still 160 test failures as of this commit, but at least the test
program can run to completion and list out all the failures.
2018-10-16 19:14:11 -07:00
Martin Atkins 03e6771536 states/statemgr: don't panic if no state file is present on first write 2018-10-16 19:14:11 -07:00
Martin Atkins 05936df0e7 statemgr: Backup file support for statemgr.Filesystem
In the old state package we had this as a separate manager
state.BackupState, but that doesn't work with our new interfaces because
we handle lineage and serial within the state managers themselves and
don't expose them to callers anymore.

In practice it being built in to the filesystem manager is not a problem
because we only use the backup functionality for local state anyway.

This also slightly adjusts the behavior to be more intuitive. The old
BackupState relied on the implementation detail that Terraform re-persists
the original state early in an apply operation, which meant that by
coincidence it would back up the right snapshot. In this new approach,
we instead take an in-memory copy during State and then write _that_ to
disk in WriteState if the new state seems different, so we're guaranteed
that we'll always write out what we read before any changes were made.

In future we may improve this further, such as keeping multiple
generations of backups, etc. But for now this is intended to preserve the
goals of the original implementation while making its behavior
self-contained and not dependent on coincidences.
2018-10-16 18:50:57 -07:00
Martin Atkins 53cafc542b statemgr: New package for state managers
This idea of a "state manager" was previously modelled via the
confusingly-named state.State interface, which we've been calling a "state
manager" only in some local variable names in situations where there were
also *terraform.State variables.

As part of reworking our state models to make room for the new type
system, we also need to change what was previously the state.StateReader
interface. Since we've found the previous organization confusing anyway,
here we just copy all of those interfaces over into statemgr where we can
make the relationship to states.State hopefully a little clearer.

This is not yet a complete move of the functionality from "state", since
we're not yet ready to break existing callers. In a future commit we'll
turn the interfaces in the old "state" package into aliases of the
interfaces in this package, and update all the implementers of what will
by then be statemgr.Reader to use *states.State instead of
*terraform.State.

This also includes an adaptation of what was previously state.LocalState
into statemgr.FileSystem, using the new state serialization functionality
from package statefile instead of the old terraform.ReadState and
terraform.WriteState.
2018-10-16 18:49:20 -07:00