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chore: improve "default" handling & caching

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add new env variables to configure which CI source gets mapped to default
add logic to check if pipeline exists in flake, else build "default"
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technofab 2025-02-22 21:57:25 +01:00
parent 55f90b4261
commit 85431f78aa
1 changed files with 17 additions and 7 deletions
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24
templates/nix-gitlab-ci.yml
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@ -28,6 +28,10 @@ variables:
_NIX_CI_CACHE_STRATEGY: $[[ inputs.cache_strategy ]]
# for multiple pipelines
_NIX_CI_PIPELINE_NAME: ${CI_PIPELINE_SOURCE}
# set NIX_CI_DEFAULT_SOURCES to something like "/^web/" or "/^web|push/",
# then this will default to the "default" pipeline for these sources.
# By default we map everything to "default" (man that's quite a bunch of defaults)
_NIX_CI_DEFAULT_SOURCES: "/.*/"
.env_overrides: &env_overrides
rules:
- if: $NIX_CI_IMAGE != null
@ -36,6 +40,12 @@ variables:
- if: $NIX_CI_CACHE_STRATEGY != null
variables:
_NIX_CI_CACHE_STRATEGY: $NIX_CI_CACHE_STRATEGY
- if: $NIX_CI_DEFAULT_SOURCES != null
variables:
_NIX_CI_DEFAULT_SOURCES: $NIX_CI_DEFAULT_SOURCES
- if: '$CI_PIPELINE_SOURCE =~ $_NIX_CI_DEFAULT_SOURCES'
variables:
_NIX_CI_PIPELINE_NAME: default
- if: $NIX_CI_PIPELINE_NAME != null
variables:
_NIX_CI_PIPELINE_NAME: $NIX_CI_PIPELINE_NAME
@ -47,30 +57,30 @@ nix-ci:build:
cache:
- key:
files: $[[ inputs.cache_files ]]
prefix: $_NIX_CI_PIPELINE_NAME
paths:
- generated-gitlab-ci.yml
- key: nix
paths:
- .nix-cache/
before_script:
# generated-gitlab-ci-<pipeline>.yml exists in the cache
- '[ -f "generated-gitlab-ci-${_NIX_CI_PIPELINE_NAME}.yml" ] && export CACHED=true && echo "A cached pipeline file exists (skip cache with NIX_CI_FORCE_BUILD)" || true'
# generated-gitlab-ci.yml exists in the cache
- '[ -f "generated-gitlab-ci.yml" ] && export CACHED=true && echo "A cached pipeline file exists (skip cache with NIX_CI_FORCE_BUILD)" || true'
# allow the user to manually skip the cache (when the key files are not correctly configured etc.)
- '[ -n "$_NIX_CI_FORCE_BUILD" ] && unset CACHED && echo "Caching skipped for this job (through NIX_CI_FORCE_BUILD)" || true'
# only setup when we need to generate the pipeline yaml
- 'if [ -z "$CACHED" ]; then source setup_nix_ci; fi'
script:
# build the generated-gitlab-ci.yml if it does not exist in the cache
- 'if [ -z "$CACHED" ]; then nix build .#gitlab-ci:pipeline:${_NIX_CI_PIPELINE_NAME} && install result generated-gitlab-ci-${_NIX_CI_PIPELINE_NAME}.yml; fi'
- 'if [ -z "$CACHED" ]; then nix eval --json ".#gitlab-ci:pipeline:${_NIX_CI_PIPELINE_NAME}" &>/dev/null && _NAME=$_NIX_CI_PIPELINE_NAME || _NAME="default"; fi'
- 'if [ -z "$CACHED" ]; then nix build .#gitlab-ci:pipeline:${_NAME} && install result generated-gitlab-ci.yml; fi'
after_script:
# NOTE: environment variables of before_script and script don't exist here anymore
#
# save to binary cache or Gitlab CI cache only if we actually built something
# check if /tmp/nix-store-before exists as $CACHED never exists here and the file only exists if "setup_nix_ci" is called
- 'if [ -f "/tmp/nix-store-before" ]; then finalize_nix_ci; fi'
artifacts:
paths:
- generated-gitlab-ci-${_NIX_CI_PIPELINE_NAME}.yml
- generated-gitlab-ci.yml
nix-ci:trigger:
<<: *env_overrides
stage: trigger
@ -78,7 +88,7 @@ nix-ci:trigger:
- nix-ci:build
trigger:
include:
- artifact: generated-gitlab-ci-${_NIX_CI_PIPELINE_NAME}.yml
- artifact: generated-gitlab-ci.yml
job: nix-ci:build
strategy: depend
forward: