Implement debugInfo and the DebugGraph
DebugInfo will be a global variable through which graph debug
information can we written to a compressed archive. The DebugInfo
methods are all safe for concurrent use, and noop with a nil receiver.
The API outside of the terraform package will be to call SetDebugInfo
to create the archive, and CloseDebugInfo() to properly close the file.
Each write to the archive will be flushed and sync'ed individually, so
in the event of a crash or a missing call to Close, the archive can
still be recovered.
The DebugGraph is a representation of a terraform Graph to be written to
the debug archive, currently in dot format. The DebugGraph also contains
an internal buffer with Printf and Write methods to add to this buffer.
The buffer will be written to an accompanying file in the debug archive
along with the graph.
This also adds a GraphNodeDebugger interface. Any node implementing
`NodeDebug() string` can output information to annotate the debug graph
node, and add the data to the log. This interface may change or be
removed to provide richer options for debugging graph nodes.
The new graph builders all delegate the build to the BasicGraphBuilder.
Having a Name field lets us differentiate the actual builder
implementation in the debug graphs.
Use this data source to get the ARN of a certificate in AWS Certificate
Manager (ACM). The process of requesting and verifying a certificate in ACM
requires some manual steps, which means that Terraform cannot automate the
creation of ACM certificates. But using this data source, you can reference
them by domain without having to hard code the ARNs as input.
The acceptance test included requires an ACM certificate be pre-created
in and information about it passed in via environment variables. It's a
bit sad but there's really no other way to do it.
When computing the set key for an EBS block device, we were using
the wrong function; we had hashEphemeralBlockDevice instead of
hashEbsBlockDevice. This caused a panic by trying to access the
virtual_name attribute that will never be set for EBS block
devices.
To fix this, I switched to the hashEbsBlockDevice function, which
is already being used to compute a Set key in the Schema. But in
the default case, where the snapshot_id attribute isn't specified,
this also caused a panic. I updated the way the string to hash is
generated to check for the existence of the device_name and
snapshot_id attributes before we use them, to avoid panics when
these optional attributes aren't set.
Spot fleet requests can have EBS volumes attached to them, and at
the moment we're getting reports that crashes can be experienced
with them. This adds an acceptance test that exercises creating
a Spot Fleet request that has a non-instance EBS volume attached.
This successfully reproduces the panic.
