The `substr` function allows the `length` parameter to be longer than the remaining characters in the input after the offset. This is useful for when you want to truncate a string to a maximum number of characters. However, the documentation isn't clear on this so I had to do a test deployment to confirm the behaviour after finding the behaviour in an old issue https://github.com/hashicorp/terraform/issues/15751
Previously the "terraform state ..." subcommands were the only way to
perform various manipulations of the state, but in recent Terraform
versions we have replaced these with better options.
Since these pages seem to already have pretty good search engine
optimization for the use-cases they are describing, we'll prioritize
mentioning the new approaches and only mention the now-deprecated or
de-emphasized features as a secondary approach.
Specifically:
- Describe the -replace=... planning option in preference to
"terraform taint", and present taint as primarily a mechanism for
Terraform to use itself, as opposed to something end-users should
typically use directly.
- Introduce the config-based refactoring features before describing
"terraform state mv".
The older features here are still applicable in some situations and are
required for those still using older versions of Terraform, so we will
retain the information about them for now while aiming to be clearer in
each case about which is our preferred, modern approach.
We recently made a change to how provisioners upload files in order to
address an unintended remote code execution vector when using SSH, which
revealed that we had not previously documented well enough the expected
contract for how provisioners upload files to remote systems, and so some
users were depending on unintended consequences of the the bug now fixed.
We are retaining the fix on security-related grounds, but this is a good
prompt to be clearer in the docs about what exactly Terraform is doing
when asked to upload files over SSH and WinRM, so users can understand
what is supported and write their configurations accordingly.
This also includes an additional section to the v1.1 upgrade guide, since
we apparently neglected to document this intentional breaking change in
the first draft of that page.
Of course, provisioners as a whole remain a last resort, and so we're
documenting this as hopefully a helpful aid to those who have no other
option, and not meaning in any way to recommend their use for any new
use-cases.
There was an unintended regression in go-getter v1.5.9's GitGetter which
caused us to temporarily fork that particular getter into Terraform to
expedite a fix. However, upstream v1.5.10 now includes a
functionally-equivalent fix and so we can heal that fork by upgrading.
We'd also neglected to update the Module Sources docs when upgrading to
go-getter v1.5.9 originally and so we were missing documentation about the
new "depth" argument to enable shadow cloning, which I've added
retroactively here along with documenting its restriction of only
supporting named refs.
This new go-getter release also introduces a new credentials-passing
method for the Google Cloud Storage getter, and so we must incorporate
that into the Terraform-level documentation about module sources.
This paragraph is trying to say that try only works for dynamic errors and
not for errors that are _not_ based on dynamic decision-making in
expressions.
I'm not sure if this typo was always here or if it was mistakenly "corrected"
at some point, but either way the word "probably" changes the meaning
of this sentence entirely, making it seem like Terraform is hedging
the likelihood of a problem rather than checking exactly for one.
