add tags and boot script

[brycahta]

Issue #, if available:

• N/A-- adding more functionality

Description of changes:

• users can now provide their own user data/boot script and tags:
  • --boot-script or -b
  • --tags
• added validations + unit tests
• don't worry-- simple-ec2 tags are still added to instances/volumes
• If users designate an auto-termination-time AND boot-script, the shutdown command will be prepended to the user's script

Testing:

• make unit-test
• ./build/simple-ec2 launch -i

Add filepath to instance boot script? 
format: absolute file path
[Press enter to choose default: no]
Your Choice >> /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot

Add tags to instances and persisted volumes? 
format: tag1:val1,tag2:val2
[Press enter to choose default: no]
Your Choice >> testedBy:Mee,reviewedBy:pdk

Please confirm if you would like to launch instance with following options: 

+--------------------------------------+----------------------------------------------------------------------------------------+
| Region                               | us-east-1                                                                              |
+--------------------------------------+----------------------------------------------------------------------------------------+
| VPC                                  | vpc-d295a6a8                                                                           |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Subnet                               | subnet-0f0fd0423d9a6183e                                                               |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Instance Type                        | t1.micro                                                                               |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Image                                | ami-047a51fa27710816e                                                                  |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Security Group                       | sg-819314ab                                                                            |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Keep EBS Volume(s) After Termination | false                                                                                  |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Auto Termination Timer in Minutes    | None                                                                                   |
+--------------------------------------+----------------------------------------------------------------------------------------+
| EBS Volumes                          | /dev/xvda(gp2): 8 GiB                                                                  |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Boot Script Filepath                 | /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Tag Specification                    | testedBy:Mee                                                                           |
|                                      | reviewedBy:pdk                                                                         |
+--------------------------------------+----------------------------------------------------------------------------------------+

• >cat test-boot:

#!/bin/bash 
    echo "sudo poweroff" | at now + 5 minutes

• ✅ user script took effect & instance shutdown as expected

• ./build/simple-ec2 launch -b /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot-2 --tags createdBy:Bryan,reviewedBy:PdK --region us-east-1 -a 3

Please confirm if you would like to launch instance with following options: 

+--------------------------------------+------------------------------------------------------------------------------------------+
| Region                               | us-east-1                                                                                |
+--------------------------------------+------------------------------------------------------------------------------------------+
| VPC                                  | vpc-d295a6a8                                                                             |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Subnet                               | subnet-0f0fd0423d9a6183e                                                                 |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Instance Type                        | t1.micro                                                                                 |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Image                                | ami-047a51fa27710816e                                                                    |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Security Group                       | sg-819314ab                                                                              |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Keep EBS Volume(s) After Termination | false                                                                                    |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Auto Termination Timer in Minutes    | 3                                                                                        |
+--------------------------------------+------------------------------------------------------------------------------------------+
| EBS Volumes                          | /dev/xvda(gp2): 8 GiB                                                                    |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Boot Script Filepath                 | /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot-2 |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Tag Specification                    | createdBy:Bryan                                                                          |
|                                      | reviewedBy:PdK                                                                           |
+--------------------------------------+------------------------------------------------------------------------------------------+

• >cat test-boot-2:

echo "yada yada"
echo "still testing ish"

• ✅ user script took effect & auto-termination-timer was applied & instance shutdown as expected

• ./build/simple-ec2 launch -h

Launch an Amazon EC2 instance with the default configurations. All configurations can be overridden by configurations provided by configuration files or user input.

Usage:
  simple-ec2 launch [flags]

Flags:
  -a, --auto-termination-timer int       The auto-termination timer for the instance in minutes
  -b, --boot-script string               The absolute filepath to a bash script passed to the instance and executed after the instance starts (user data)
  -h, --help                             help for launch
  -p, --iam-instance-profile string      The profile containing an IAM role to attach to the instance
  -m, --image-id string                  The image id of the AMI used to launch the instance
  -t, --instance-type string             The instance type of the instance
  -i, --interactive                      Interactive mode
  -k, --keep-ebs                         Keep EBS volumes after instance termination
  -l, --launch-template-id string        The launch template id with which the instance will be launched
  -v, --launch-template-version string   The launch template version with which the instance will be launched
  -r, --region string                    The region where the instance will be launched
  -c, --save-config                      Save config as a JSON config file
  -g, --security-group-ids strings       The security groups with which the instance will be launched
  -s, --subnet-id string                 The subnet id in which the instance will be launched
      --tags strings                     The tags applied to instances and volumes at launch

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[brycahta]

• Using | as the delimiter for defining tags in interactive mode since it is not a legal tag char
• Created a constructor for SimpleInfo now that there's a map attr

Testing

Interactive mode CX

Add tags to instances and persisted volumes? 
format: tag1|val1,tag2|val2
[Press enter to choose default: no]
Your Choice >> revdBy|PdK,createdBy:|BRYAN

Please confirm if you would like to launch instance with following options: 

+--------------------------------------+----------------------------------------------------------------------------------------+
| Region                               | us-east-1                                                                              |
+--------------------------------------+----------------------------------------------------------------------------------------+
| VPC                                  | vpc-d295a6a8                                                                           |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Subnet                               | subnet-0f0fd0423d9a6183e                                                               |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Instance Type                        | t1.micro                                                                               |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Image                                | ami-047a51fa27710816e                                                                  |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Security Group                       | sg-819314ab                                                                            |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Keep EBS Volume(s) After Termination | false                                                                                  |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Auto Termination Timer in Minutes    | None                                                                                   |
+--------------------------------------+----------------------------------------------------------------------------------------+
| EBS Volumes                          | /dev/xvda(gp2): 8 GiB                                                                  |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Boot Script Filepath                 | /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot |
+--------------------------------------+----------------------------------------------------------------------------------------+
| Tag Specification                    | revdBy | PdK                                                                           |
|                                      | createdBy: | BRYAN                                                                     |
+--------------------------------------+----------------------------------------------------------------------------------------+

• non-Interactive mode

./build/simple-ec2 launch -b /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot-2 --tags createdBy=Bryan,reviewedBy=PdK --region us-east-1 -a 3

Please confirm if you would like to launch instance with following options: 

+--------------------------------------+------------------------------------------------------------------------------------------+
| Region                               | us-east-1                                                                                |
+--------------------------------------+------------------------------------------------------------------------------------------+
| VPC                                  | vpc-d295a6a8                                                                             |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Subnet                               | subnet-0f0fd0423d9a6183e                                                                 |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Instance Type                        | t1.micro                                                                                 |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Image                                | ami-047a51fa27710816e                                                                    |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Security Group                       | sg-819314ab                                                                              |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Keep EBS Volume(s) After Termination | false                                                                                    |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Auto Termination Timer in Minutes    | 3                                                                                        |
+--------------------------------------+------------------------------------------------------------------------------------------+
| EBS Volumes                          | /dev/xvda(gp2): 8 GiB                                                                    |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Boot Script Filepath                 | /Users/crtbry/workplace/go/src/simpleEc2_brycahta_fork_ws/aws-simple-ec2-cli/test-boot-2 |
+--------------------------------------+------------------------------------------------------------------------------------------+
| Tag Specification                    | createdBy | Bryan                                                                        |
|                                      | reviewedBy | PdK                                                                         |
+--------------------------------------+------------------------------------------------------------------------------------------+

[pdk27]

LGTM. Thanks for the changes.

Left a few minor comments.

[pdk27]

format below tag1|val1 without spaces. May be get rid of extra spaces for clarity?

Or how about adding a header to the tags slice here like tags

var tags = []string{"KEY | VALUE"}

[brycahta]

• Removing the spaces from tag1|val1
• Your suggestion is definitely clearer, but the way table is implemented and formatted now it'd be difficult to get such a view today
• In the mean time, I'll format it in the final confirmation to be cleaner and revisit when/if we refactor the table logic:

+--------------------------------------+--------------------------+
| Tag Specification(key|value)         | taggd|Bryan              |
|                                      | revd:|pdk                |
+--------------------------------------+--------------------------+