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https://github.com/kevinveenbirkenbach/computer-playbook.git
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56 lines
2.5 KiB
Bash
Executable File
56 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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# Splits a JSON array of app IDs proportionally between GitHub-hosted and
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# self-hosted CI runners.
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#
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# When CI_SELF_HOSTED_RUNNER_COUNT is 0 or unset, all apps are assigned to
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# the GitHub-hosted batch and the self-hosted batch is empty — CI behaves
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# exactly as before with no self-hosted runners registered.
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#
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# The split ratio mirrors the relative throughput of each runner pool:
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# github_count = floor(total × GITHUB_QUOTA / (GITHUB_QUOTA + SELF_HOSTED_COUNT))
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#
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# Apps listed in PINNED_GITHUB are always kept on GitHub-hosted runners
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# regardless of the split ratio (e.g. svc-runner installs host-level systemd
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# services that conflict with production self-hosted runners).
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#
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# Inputs (environment variables):
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# APPS_JSON JSON array of app IDs from the discover step
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# CI_SELF_HOSTED_RUNNER_COUNT self-hosted runner instance count (default: 0)
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#
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# Outputs (appended to $GITHUB_OUTPUT):
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# apps_github JSON array routed to GitHub-hosted runners
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# apps_self_hosted JSON array routed to self-hosted runners ([] when disabled)
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set -euo pipefail
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APPS_JSON="${APPS_JSON:-[]}"
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SELF_HOSTED_COUNT="${CI_SELF_HOSTED_RUNNER_COUNT:-0}"
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GITHUB_QUOTA=20
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# Apps that must always run on GitHub-hosted runners.
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PINNED_GITHUB='["svc-runner"]'
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if [[ "${SELF_HOSTED_COUNT}" -le 0 ]]; then
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echo "apps_github=${APPS_JSON}" >>"${GITHUB_OUTPUT}"
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echo "apps_self_hosted=[]" >>"${GITHUB_OUTPUT}"
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total="$(echo "${APPS_JSON}" | jq 'length')"
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echo "=== Runner split: all ${total} apps → GitHub-hosted (self-hosted disabled) ==="
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exit 0
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fi
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# Separate pinned apps from the pool before splitting.
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pinned="$(echo "${APPS_JSON}" | jq -c --argjson pins "${PINNED_GITHUB}" '[.[] | select(. as $a | $pins | index($a) != null)]')"
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pool="$(echo "${APPS_JSON}" | jq -c --argjson pins "${PINNED_GITHUB}" '[.[] | select(. as $a | $pins | index($a) == null)]')"
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total="$(echo "${pool}" | jq 'length')"
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github_count=$((total * GITHUB_QUOTA / (GITHUB_QUOTA + SELF_HOSTED_COUNT)))
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self_count=$((total - github_count))
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apps_github="$(echo "${pool}" | jq -c --argjson pinned "${pinned}" "\$pinned + .[0:${github_count}]")"
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apps_self="$(echo "${pool}" | jq -c ".[${github_count}:]")"
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echo "apps_github=${apps_github}" >>"${GITHUB_OUTPUT}"
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echo "apps_self_hosted=${apps_self}" >>"${GITHUB_OUTPUT}"
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pinned_count="$(echo "${pinned}" | jq 'length')"
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echo "=== Runner split: ${pinned_count} pinned + ${github_count} apps → GitHub-hosted, ${self_count} apps → self-hosted (${SELF_HOSTED_COUNT} runners) ==="
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