Add http_content func to serve variables from HTTP @ preseed

[azr]

This imports hashicorp/packer-plugin-sdk#43

• code generate things
• update docs
• update guides
• update examples

This helps with #9485

[codecov]

Codecov Report

Merging #10801 (098ca11) into master (8c61ca1) will increase coverage by 0.02%.
The diff coverage is 14.28%.

❗ Current head 098ca11 differs from pull request most recent head f37fab0. Consider uploading reports for the commit f37fab0 to get more accurate results

Impacted Files	Coverage Δ
builder/cloudstack/builder.go	7.31% <0.00%> (+0.42%)	⬆️
builder/hyperv/iso/builder.go	27.31% <0.00%> (+0.65%)	⬆️
builder/hyperv/vmcx/builder.go	19.57% <0.00%> (+0.34%)	⬆️
builder/parallels/iso/builder.go	39.67% <0.00%> (+1.04%)	⬆️
builder/proxmox/common/builder.go	0.00% <0.00%> (ø)
builder/qemu/builder.go	0.00% <0.00%> (ø)
builder/virtualbox/iso/builder.go	37.20% <0.00%> (+0.60%)	⬆️
builder/virtualbox/ovf/builder.go	0.00% <0.00%> (ø)
builder/vmware/iso/builder.go	3.33% <0.00%> (+0.09%)	⬆️
builder/vmware/vmx/builder.go	3.52% <0.00%> (+0.10%)	⬆️
... and 4 more

[azr]

Not sure if this one was necessary but since HTTPDir is there, I'm putting it

[sylviamoss]

Better be safe!

[sylviamoss]

LGTM 👍🏼
Tested with virtualbox-iso building an alpine image and it worked!

[ekristen]

Is this in a released version yet? Documentation doesn't seem to be live? Trying this with 1.7.2 locally doesn't seem to work?

[ekristen]

For anyone that gets here -- you have to add a front slash to your files, or things will not work.

http_content = {
  "a/b" = "content
}

^^^ this will not work!

http_content = {
  "/a/b" = "content
}

This will.

[azr]

Hello there, thanks for adding this, a blog post is coming up ! I got tricked by the first slash a few times myself.

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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