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feat(scaffold): !include and other YAML functions in scaffold.yaml - #3230
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review. 📝 WalkthroughWalkthroughScaffold manifests now resolve supported YAML functions before validation. Include paths use the configured source directory, and consumed local files are omitted from generated output. Large text comparisons use approximate changed-line counts above 5,000 lines. Matrix expansion clones row maps. ChangesScaffold YAML function support
Large text comparison
Matrix row copying
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Generation as scaffold generation
participant ConfigLoader as LoadScaffoldConfigFromContent
participant ManifestLoader as manifest Load
participant TagWalker as WalkYAMLTags
participant Renderer as file renderer
Generation->>ConfigLoader: load scaffold with source directory
ConfigLoader->>ManifestLoader: configure include resolution
ManifestLoader->>TagWalker: resolve include tags and collect paths
TagWalker-->>ManifestLoader: resolved YAML and consumed paths
ManifestLoader-->>ConfigLoader: validated scaffold configuration
Generation->>Renderer: skip files matching consumed include paths
Suggested labels: Suggested reviewers: Merge Risk: ⚪ Minimal · up to No change is required for the documented large-file approximation. The PR is mergeable after normal checks. Architecture SummaryArchitecture risk: 🔵 Low · up to The change affects 5 systems. Changed systems: Architecture concerns Review detailsSystems and components
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🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @pkg/generator/templates/embeds.go:
- Around line 260-267: Update the scaffold-loading call in the template-loading
flow to omit the source directory when source is config.SourceEmbedded, so
embedded !include paths cannot resolve against the process working directory.
Preserve config.WithSourceDir(source) for fetched and local templates.
Review comments at @pkg/manifest/include.go:
- Around line 99-121: Update walkIncludeTags and processCustomTagsInner to
recurse using the included document’s file path as the base for nested includes,
rather than the original file. Normalize consumed paths against that same
include base so nested includes resolve and are recorded relative to the file
that contains them.
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📒 Files selected for processing (19)
cmd/scaffold/scaffold.goexamples/scaffolding-include/NOTICE.mdexamples/scaffolding-include/README.mdexamples/scaffolding-include/atmos.yamlexamples/scaffolding-include/lib/licenses.yamlexamples/scaffolding-include/scaffold.yamlpkg/generator/templates/embeds.gopkg/generator/ui/include_test.gopkg/generator/ui/rendered_base.gopkg/generator/ui/ui.gopkg/manifest/include.gopkg/manifest/include_test.gopkg/manifest/load.gopkg/project/config/include_test.gopkg/project/config/persistence.gowebsite/blog/2026-09-25-scaffold-include.mdxwebsite/docs/cli/commands/scaffold/generate.mdxwebsite/docs/cli/commands/scaffold/validate.mdxwebsite/src/data/roadmap.js
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Actionable comments posted: 1
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @pkg/generator/ui/ui.go:
- Around line 154-169: Update includedPathSet and its callers to normalize
absolute include arguments against the template source directory before
comparing them with tmpl.File.Path. Pass the appropriate source directory in
both project-output filtering and rendered-base generation; keep paths outside
that directory from being treated as local included files.
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cmd/scaffold/scaffold.goexamples/scaffolding-include/NOTICE.mdexamples/scaffolding-include/README.mdexamples/scaffolding-include/atmos.yamlexamples/scaffolding-include/lib/licenses.yamlexamples/scaffolding-include/scaffold.yamlpkg/generator/source/resolver.gopkg/generator/source/resolver_test.gopkg/generator/templates/embeds.gopkg/generator/templates/embeds_test.gopkg/generator/ui/include_test.gopkg/generator/ui/rendered_base.gopkg/generator/ui/ui.gopkg/generator/ui/ui_test.gopkg/manifest/include.gopkg/manifest/include_test.gopkg/manifest/load.gopkg/project/config/include_test.gopkg/project/config/persistence.gowebsite/blog/2026-09-25-scaffold-include.mdxwebsite/docs/cli/commands/scaffold/generate.mdxwebsite/docs/cli/commands/scaffold/validate.mdxwebsite/src/data/roadmap.js
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CodeRabbit (@coderabbitai) I am concerned this is re-implementing how we do YAML "functions" (explicit tags), rather than reusing our module which supports a whole library of functions. Rather than implement only support for |
Erik Osterman (Cloud Posse) (osterman)
added
the
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -e
ast-grep outline pkg/manifest/include.go --items all
ast-grep outline pkg/project/config/persistence.go --items all
rg -n -C2 'ProcessYamlFunctions|ProcessYAMLFunctions|processYamlFunctions|processYAMLFunctions|ProcessInclude|!include\.raw|YamlFunctions|YAMLFunctions' --type go pkg | head -220Length of output: 18950 🏁 Script executed: #!/bin/bash
set -e
ast-grep outline pkg/function --type function --match 'Parse|Process|Execute|Resolve|New|Register|Walk' | head -170
rg -n -C3 'parser\.|!literal|!include\.raw|ProcessYAMLFunction|ProcessYamlFunction' --type go pkg/stack pkg/config pkg/function pkg/manifest | head -270
sed -n '1,170p' pkg/manifest/include.go
sed -n '1,110p' pkg/manifest/load.go
sed -n '1,115p' pkg/project/config/persistence.goLength of output: 34195 🏁 Script executed: #!/bin/bash
set -e
ast-grep outline pkg/utils/yaml_utils.go --items all --match 'processCustomTagsInner|ProcessIncludeTag|ProcessIncludeRawTag|ProcessCustomTags|ProcessYaml'
ast-grep outline pkg/function/registry.go --items all
ast-grep outline pkg/function/defaults.go --items all
ast-grep outline pkg/function/context.go --items all
ast-grep outline pkg/function/tag --items all --match 'Is|Get|All'
rg -n -C4 'func (processCustomTagsInner|ProcessIncludeTag|ProcessIncludeRawTag|ProcessCustomTags)|processCustomTagsInner\(|NewRegistry\(|RegisterDefaults\(|NewExecutionContext\(' --type go pkg/utils pkg/function pkg/stack pkg/config | head -210
sed -n '1,190p' pkg/function/defaults.go
sed -n '1,165p' pkg/function/context.go
sed -n '1,140p' pkg/function/registry.go
sed -n '15,68p' pkg/merge/merge_yaml_functions.goLength of output: 23423 🏁 Script executed: #!/bin/bash
set -e
sed -n '725,860p' pkg/utils/yaml_utils.go
sed -n '1,150p' pkg/function/tag/tag.go
sed -n '1,145p' pkg/function/function.go
sed -n '1,110p' pkg/function/include.go
rg -n -C2 'ProcessCustomTags|processCustomTags\(' --type go pkg/utils pkg/config pkg/stack | head -95Length of output: 18869
I would share the tag traversal and dispatch with
This would remove the duplicate dispatcher. Supporting the full catalog also requires a decision about what stack-dependent functions mean in ✏️ Learnings added
You are interacting with an AI system. |
Agreed, those should not be exported.
Let's do this.
Not necessary. |
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #3230 +/- ##
========================================
Coverage 84.66% 84.66%
========================================
Files 2103 2105 +2
Lines 206538 206758 +220
========================================
+ Hits 174867 175057 +190
- Misses 23402 23429 +27
- Partials 8269 8272 +3
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Tip For best results, initiate chat on the files or code changes.
This plan uses the preference you raised earlier to reuse the existing YAML function handling rather than add an include-only dispatcher. It does not require defining scaffold behavior for the full stack-dependent catalog. ✏️ Learnings added
🧠 Learnings used
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- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @website/docs/cli/commands/scaffold/generate.mdx:
- Around line 268-270: Update the `!include` documentation in the scaffold.yaml
section to state that included file content is not processed transitively, so
nested `!include` tags are not resolved. Keep the existing description of where
`!include` can be used.
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docs/prd/atmos-scaffold.mdpkg/function/tag/tag.gopkg/function/tag/tag_test.gopkg/generator/templates/embeds_test.gopkg/generator/ui/include_test.gopkg/manifest/include.gopkg/manifest/include_test.gopkg/manifest/manifest_test.gopkg/manifest/tag_policy_test.gopkg/utils/yaml_tag_walker.gopkg/utils/yaml_tag_walker_test.gopkg/utils/yaml_utils.gowebsite/docs/cli/commands/scaffold/generate.mdx
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Jorrit Elfferich (jorrite)
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Addressed the duplicate-tag-dispatch feedback: extracted a shared, policy-driven YAML tag walker ( Worth flagging explicitly: an earlier pass of this also included Also addressed a follow-up CodeRabbit finding: documented (in PR title/description and the example (renamed to |
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…erated files An absolute !include argument resolved fine via findLocalFile, but includedPathSet kept it unchanged while tmpl.File.Path is always relative, so the lookup missed and the included file leaked into project output. Rebase absolute arguments onto the template's IncludeSourceDir() first.
…a shared YAML tag walker scaffold.yaml's !include support used a bespoke, !include-only tag walker that duplicated the stack-manifest loader's own tag dispatch (pkg/utils's processCustomTags/processCustomTagsInner). Extract that dispatch into a policy-driven WalkYAMLTags (pkg/utils), with the stack-manifest caller's policy behavior-preserving by construction (same four immediately-resolved tags, same defer-to-later-phase fallback for everything else -- verified via the full existing pkg/utils test suite passing unmodified). scaffold.yaml gets its own ScaffoldTagPolicy: !include/!include.raw plus every tag that needs no stack/component/ backend context (!env, !exec, !random, !cwd, the !git.*/!repo-root family, !literal) now resolve immediately instead of only !include; any other tag (!terraform.state, !store, !secret, etc.) is rejected outright with a clear error naming it, rather than silently deferred to a later phase scaffold.yaml has none of. Full stack-dependent tag support stays out of scope -- those tags get a clean rejection instead. The supported set is fntag.ScaffoldYAML() (pkg/function/tag), mirroring the existing AtmosConfigYAML() allow-list atmos.yaml's own loader already uses for the identical "no stack context available" problem -- swapping !unset (no equivalent in scaffold.yaml's field/answer merge) for !literal (a real, stack-context-free need: bypassing scaffold's own Go-template evaluation of a field value). Not done here, left as a documented follow-up: migrating atmos.yaml's own loader (pkg/config/process_yaml.go) onto the same shared walker. Its handlers write into a viper.Viper sink, and it uses a different YAML library (go.yaml.in/yaml/v3) than pkg/utils/pkg/manifest (gopkg.in/yaml.v3) -- found while investigating this, meaning even the smaller fix of pointing its own handleInclude at the shared utils.ProcessIncludeTag isn't a same-type drop-in.
…ions Field-testing found atmos scaffold list alone executes a configured template's !exec command -- scaffold.yaml is resolved for every configured template just to populate the list/picker, not only the one a user selects or generates, so allowing shell execution there lets any configured template (including a shared/vendored one) run arbitrary code merely by being listed, with no generate/validate/confirmation needed. Remove !exec from ScaffoldTagPolicy/ScaffoldYAML; every other context-free tag (!env, !random, !cwd, the !git.* family, !literal) is unaffected and still resolves normally. A template using !exec now fails to load with a clear "unsupported YAML tag" error instead of running the command, and atmos scaffold list already handles a single broken template gracefully (skips it with a warning) without affecting the rest of the listing.
…aths Patch coverage check against upstream/main flagged several zero-count branches: fntag.ScaffoldYAML/IsScaffoldYAML (no direct test, only exercised indirectly through Load), WalkYAMLTags's document-node unwrap, non-defer rejection path, and simpleTagHandler/handleAppendTag error branches (cross-package attribution gap between pkg/utils and its pkg/manifest caller), resolveIncludeTags's invalid-YAML and malformed-include-argument branches, Load's unregistered-kind skip, and Configuration.IncludeSourceDir's LocalDir/default-Source branches. Add targeted tests for each. One branch (resolveIncludeTags's yaml.Marshal re-serialization failure) is left uncovered with a stated reason: yaml.v3's Marshal has no reachable error path from any legitimate scaffold.yaml input after a successful tag walk, matching the same already-accepted defensive-code pattern as load.go's json.Marshal branch.
Pre-existing comment in TestExecuteWithSetup_AbsoluteIncludedLocalFileExcludedFromOutput had a sentence starting with a lowercase identifier (findLocalFile); golangci-lint's godot check requires comment sentences to start with a capital letter.
…ore YAML functions Rename examples/scaffolding-include to examples/scaffolding-yaml-functions and add two more computed fields (generated_from_branch via !git.branch, maintainer via !env), each with a fallback default so generation still works outside a git repository or without the environment variable set. NOTICE.md and the README are updated to show and explain both. Rewrite the accompanying blog post (website/blog/2026-10-01-scaffold-include.mdx, renamed from its 2026-09-25 filename to today's date) and its roadmap entry around the broader "!include and other YAML functions" scope, rather than !include alone, and fix the doc anchor link after generate.mdx's section heading changed.
CodeRabbit review flagged that the scaffold.yaml section of generate.mdx never documented this for users, even though pkg/manifest/include.go's own doc comment has explained the underlying reason since 63c6ffb: the fetch decodes included content generically, and a custom YAML tag like !include does not survive that decode, so a nested !include inside an included file's own content always resolves to inert, unprocessed text. Stack manifests share the same implementation and the same limitation.
…ns blog post !exec doesn't need stack/component/backend context like !terraform.state, !store, and !secret do -- it's excluded because scaffold.yaml is resolved for every configured template just to populate atmos scaffold list and the picker, so allowing shell execution there would let a template run arbitrary code merely by being listed. Lumping it into the same "needs context" bucket as the others misstated why it's rejected.
…ing alloc, capped it
…agged The clamped-rowLen guard and the maxLCSLines early-return both still left an addition feeding make()'s size argument, and CodeQL re-flagged both on the next scan regardless of the guard. Both allocations no longer compute their size via addition at all: matrix.go's row copy uses maps.Clone (which sizes its own allocation internally), and text_merger.go's LCS table is now sized m x n instead of the padded (m+1) x (n+1), with the empty-prefix base case handled by explicit i==0/j==0 branches instead of a padding row/column.
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These changes were released in v1.231.0-rc.4. |
4 participants
what
scaffold.yamlnow resolves a shared set of Atmos YAML functions, not just!include:!include/!include.raw,!env,!random,!cwd, the!git.*/!repo-rootfamily, and!literal— anywhere a scaffold manifest currently accepts a literal value:options:, atype: computedfield'svalue:, or amatrix:axis.pkg/utils.WalkYAMLTags/TagWalkPolicy) that both the stack-manifest loader and scaffold's ownScaffoldTagPolicygo through — not a bespoke, scaffold-only walker.!terraform.state,!store,!secret, etc.) is rejected outright with a clear error naming it, instead of silently deferred to a later phasescaffold.yamlhas none of.scaffold.yamlitself is.atmos scaffold validateresolves all of this too, not justgenerate, so a missing file, bad filter, or malformed function call is caught before anyone runsgenerate.generate.mdx), blog post, roadmap entry, and example (examples/scaffolding-yaml-functions, renamed fromscaffolding-include) updated to demonstrate!includeplus!git.branchand!env.why
scaffold.yamlitself, copied into every field that needed it.!includealready solves this for stack manifests; extending it to scaffold manifests reuses a mechanism users already know.!include-only tag walker, duplicating the stack-manifest loader's own dispatch logic. Refactored into one shared walker instead, so supporting more of Atmos's YAML function catalog didn't mean reinventing dispatch a third time.A note on
!execAn earlier version of this PR included
!execin the expanded tag set. A field-test pass against the real binary found that was a real RCE risk, not a theoretical one:scaffold.yamlis resolved for every configured template just to show its name/description inatmos scaffold listand the interactive template picker — not only the one a user actually selects or generates. With!execsupported, simply runningatmos scaffold listwould silently execute a shell command from any configured template, including a shared or vendored one, with nogenerate,--force, or confirmation involved (confirmed live with a workingtouch-based proof-of-execution).!execis removed entirely as a result; every other context-free tag is unaffected.Fixes found during review
!includetarget could resolve relative to the process's CWD instead of failing cleanly, since the internal"embedded"marker was passed around as if it were a real directory.oci://,git::,https://,s3://) local!includealways failed generation: the real fetch directory gets overwritten with the original remote reference string right after fetching (for display/provenance), and a later re-parse of the samescaffold.yamlwas using that overwritten value instead of the real, still-alive directory.!includetag was confirmed unreachable:!include's fetch decodes the included file's content generically, and a custom YAML tag doesn't survive that decode. Documented the actual (pre-existing, shared with stack manifests) limitation rather than "fixing" something that was never reachable -- and, per a later review pass, added that same explanation to the user-facing docs (generate.mdx), not just the internal doc comment.references
type: computedfields), which this PR builds on and which merged ase42695003.generate.mdx#loading-external-data-with-include-and-other-yaml-functionswebsite/blog/2026-10-01-scaffold-include.mdxexamples/scaffolding-yaml-functionsSummary by CodeRabbit
!exec, are unsupported.