Subnet information is only really needed when the specified `vpc_id` is
not the default VPC for the region where the builder is being executed.
This change uses the AWS API to determine if the VPC provided is a
non-default VPC and only validates the existence of a `subnet_id` if a
user has provided a non-default `vpc_id`.
Tests after change
```
> make test TEST=./builder/amazon/... TESTARGS='-count=1 -v -run=TestStepPreValidate_checkVpc'
...
=== RUN TestStepPreValidate_checkVpc
=== RUN TestStepPreValidate_checkVpc/DefaultVpc
=== RUN TestStepPreValidate_checkVpc/NonDefaultVpcNoSubnet
=== RUN TestStepPreValidate_checkVpc/NonDefaultVpcWithSubnet
=== RUN TestStepPreValidate_checkVpc/SubnetWithNoVpc
=== RUN TestStepPreValidate_checkVpc/NoVpcInformation
--- PASS: TestStepPreValidate_checkVpc (0.00s)
--- PASS: TestStepPreValidate_checkVpc/DefaultVpc (0.00s)
--- PASS: TestStepPreValidate_checkVpc/NonDefaultVpcNoSubnet (0.00s)
--- PASS: TestStepPreValidate_checkVpc/NonDefaultVpcWithSubnet (0.00s)
--- PASS: TestStepPreValidate_checkVpc/SubnetWithNoVpc (0.00s)
--- PASS: TestStepPreValidate_checkVpc/NoVpcInformation (0.00s)
PASS
...
```
to accept a list of strings (for Amazon builders).
Per this change, `temporary_security_group_source_cidr` in the configuration:
1. Will be renamed to `temporary_security_group_source_cidrs`.
2. Will accept a list of CIDRs.
3. Will have its documentation updated to reflect this change.
4. Will have a fixer attached for newer templates to avail of.
* removed packer.Cache and references since packer.Cache is never used except in the download step. The download step now uses the new func packer.CachePath(targetPath) for this, the behavior is the same.
* removed download code from packer that was reimplemented into the go-getter library: progress bar, http download restart, checksuming from file, skip already downloaded files, symlinking, make a download cancellable by context.
* on windows if packer is running without symlinking rights and we are getting a local file, the file will be copied instead to avoid errors.
* added unit tests for step_download that are now CI tested on windows, mac & linux.
* files are now downloaded under cache dir `sha1(filename + "?checksum=" + checksum) + file_extension`
* since the output dir is based on the source url and the checksum, when the checksum fails, the file is auto deleted.
* a download file is protected and locked by a file lock,
* updated docs
* updated go modules and vendors
to retain current encryption settings
this changes the fields :
* ami_config.encrypt_boot
* block_device.encrypted
This also removes StepCreateEncryptedAMICopy as this step is now done in StepAMIRegionCopy
This means it now has three states, `true`, `false`, & `nil`. The
default state is now `nil` which does nothing instead of `false` which
now will explicitly disable ENA support instead of just not enabling it.
Megan Marsh
nywilken
Bernard Baltrusaitis
Adrien Delorme
Akshat Mahajan
Matt Dainty
Matthew Hooker