grim/convey

Merge successfully!
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2017-10-03, Eric Fritz
f099426f7d97
Parents 06eb1c85a2b546472d8da780
Children 6144f314f439
Merge successfully!
2 files changed, 64 insertions(+), 0 deletions(-)
  • +26 -0
    examples/extends-merge.yml
  • +38 -0
    loaders/convey/plans.go
    • --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/examples/extends-merge.yml Tue Oct 03 21:50:34 2017 -0500
    @@ -0,0 +1,26 @@
    +# This plan extends another plan by overwriting the pre and post
    +# stages of a plan defined in the parent config. This shows how
    +# to build "abstract" plans which can be extended in ways that
    +# allow blocks of plans to be replaced.
    +
    +extends: base.yml
    +
    +options:
    + default-plan: plan3
    +
    +tasks:
    + before:
    + image: gliderlabs/alpine:edge
    + command: echo "<= before"
    + after:
    + image: gliderlabs/alpine:edge
    + command: echo "=> after"
    +
    +plans:
    + plan3:
    + merge: true
    + stages:
    + - name: pre
    + tasks: [before]
    + - name: post
    + tasks: [after]
    --- /dev/null Thu Jan 01 00:00:00 1970 +0000
    +++ b/loaders/convey/plans.go Tue Oct 03 21:50:34 2017 -0500
    @@ -0,0 +1,38 @@
    +package convey
    +
    +import (
    + "fmt"
    +
    + "bitbucket.org/rw_grim/convey/environment"
    + "bitbucket.org/rw_grim/convey/plans"
    + "bitbucket.org/rw_grim/convey/stages"
    +)
    +
    +// mergePlan modifies parent in-place so that any stage declared in child
    +// will overwrite the stage of the same name in parent. Return an error if
    +// a stage exists in child but not parent. Environments are also merged.
    +func mergePlan(parent, child plans.Plan, name string) (plans.Plan, error) {
    + for _, stage := range child.Stages {
    + if !replaceStage(parent, stage) {
    + return plans.Plan{}, fmt.Errorf(
    + "cannot overwrite stage '%s' in plan '%s' (no such stage in parent)",
    + stage.Name,
    + name,
    + )
    + }
    + }
    +
    + parent.Environment = environment.Merge(parent.Environment, child.Environment)
    + return parent, nil
    +}
    +
    +func replaceStage(plan plans.Plan, stage stages.Stage) bool {
    + for i, match := range plan.Stages {
    + if match.Name == stage.Name {
    + plan.Stages[i] = stage
    + return true
    + }
    + }
    +
    + return false
    +}