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Ben PotterandNick Vigilante
3bdd395faa
`merge_strategy` on `coder_env` only combines values across `coder_env` resources targeting the same name. It does not know about the value already set by the workspace's image or host, such as the base `PATH`. A user hit this in #27501: appending to `PATH` with three `coder_env` resources replaced the host's `PATH` entirely, since none of them referenced the existing value. Clarify this in the docs, and update the `PATH` example to show referencing `$PATH` in one of the resources so the host's original value is kept. Refs #27501 <details> <summary>Investigation notes</summary> - `coderd/provisionerdserver/provisionerdserver.go` builds the merged env starting from an empty map (`MergeExtraEnvs`), only combining `coder_env` resources with each other. - `agent/agent.go`'s `updateCommandEnv` applies the result with `os.ExpandEnv(v)`, which expands `$VARNAME` against the agent's real process environment. - Confirmed with a standalone repro that `value = "$PATH:/usr/local/cuda/bin"` preserves the host's real `PATH` and appends the extra directory, and that this composes correctly across multiple `coder_env` resources with `merge_strategy = "append"` as long as one of them references `$PATH`. - A companion PR updates the `terraform-provider-coder` schema description and example that feed the registry docs: https://github.com/coder/terraform-provider-coder (branch `bpmct/docs-env-merge-host`). </details> --- *Opened by Coder Agents on behalf of @bpmct.* --------- Co-authored-by: Nick Vigilante <nickvigilante@users.noreply.github.com>