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Nomad v2.17.0+tweaks #620

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Nomad v2.17.0+tweaks #620

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angrycub
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This branch applies all of the Nomad tweaks to the v2.17.0 release. This will enable Nomad and Nomad-pack to leverage to the Extra field on Diagnostics.

Expose a callback to handle unknown variables found in hcl syntax. This is
useful in situations where the variables aren't known statically upfront.

A merge of the following commits:
ccf34c5
eb14f83
@angrycub angrycub added the v2 Relates to the v2 line of releases label Jul 25, 2023
@angrycub angrycub self-assigned this Jul 25, 2023
Comment on lines +104 to +106
if fn, ok := d.bodyConvertors[val.Type()]; ok {
return fn(body, ctx, val.Addr().Interface())
}
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Nomad allows for constraint blocks where certain operators can be expressed as LHS constants. For example, the canonical distinct_hosts constraint is written as follows:

constraint {
  operator  = "distinct_hosts"
  value     = "true"
}

However, Nomad supports an alternative representation of this same constraint.

constraint {
    distinct_hosts = true
}

Before re-adding this code, the shortened form would produce the following error.

Unsupported argument; An argument named "distinct_hosts" is not expected here.

Fixes hashicorp/nomad#18122 (comment)

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