update conditional variables
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@@ -1,45 +1,72 @@
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name: Conditional Variables
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description: |
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Evaluates a list of conditions and exposes variables as outputs.
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Conditions are evaluated in order. All matching conditions are applied.
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If multiple conditions set the same variable, the last matching value wins.
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Evaluates a set of rules and exposes variables as outputs.
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Rules are evaluated in the order they are defined.
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A rule matches when any of its conditions match the supplied context.
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If multiple matching rules set the same variable,
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the last matching value wins.
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inputs:
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context:
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description: |
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Context variables available during condition evaluation.
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conditions:
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description: |
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List of conditions to evaluate.
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Context variables available during rule evaluation.
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Example:
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- when:
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branch:
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- 9.0-alpine-24
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- 9.0-alpine-23
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branch=9.0-alpine-24
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event=push
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install_something=1
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required: true
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rules:
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description: |
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Rules to evaluate.
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Example:
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- conditions:
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- branch == 9.0-alpine-24
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- branch == 9.0-alpine-23
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set:
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DOTNET_VERSION: 9.0
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DOTNET_VERSION=9.0
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DOTNET_RUNTIME_VERSION=9.0.18
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- conditions:
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- install_something == 1
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set:
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INSTALL_DEPENDENCY=true
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Conditions within a rule are evaluated as OR.
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required: true
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fail-on-no-match:
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description: |
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Fail the action when no condition matches.
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Fail the action if no rule matches.
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required: false
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default: "false"
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outputs:
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matched:
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description: Indicates whether at least one rule matched.
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value: ${{ steps.evaluate.outputs.matched }}
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runs:
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using: composite
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steps:
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- name: Evaluate conditions
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- name: Evaluate rules
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id: evaluate
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shell: bash
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env:
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CONTEXT: ${{ inputs.context }}
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CONDITIONS: ${{ inputs.conditions }}
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RULES: ${{ inputs.rules }}
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FAIL_ON_NO_MATCH: ${{ inputs.fail-on-no-match }}
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run: |
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"${{ github.action_path }}/evaluate.sh"
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@@ -1,3 +1,8 @@
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declare -A context
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#
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# Remove leading/trailing whitespace
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#
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trim() {
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local var="$*"
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var="${var#"${var%%[![:space:]]*}"}"
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@@ -5,48 +10,51 @@ trim() {
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printf '%s' "$var"
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}
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declare -A context
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#
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# Load key=value pairs into context array
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#
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load_context() {
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while IFS='=' read -r key value; do
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key="$(trim "${key:-}")"
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value="$(trim "${value:-}")"
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[[ -z "$key" ]] && continue
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[[ "$key" =~ ^# ]] && continue
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context["$key"]="$value"
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done <<< "$CONTEXT"
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}
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#
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# Load context
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# Evaluate a single condition
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#
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while IFS='=' read -r key value; do
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key="$(trim "${key:-}")"
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value="$(trim "${value:-}")"
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[[ -z "$key" ]] && continue
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[[ "$key" =~ ^# ]] && continue
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context["$key"]="$value"
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done <<< "$CONTEXT"
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matched=false
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# Examples:
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# branch == 9.0
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# event != push
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# count > 10
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#
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# Evaluate conditions (OR)
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#
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while IFS= read -r condition; do
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evaluate_condition() {
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condition="$(trim "${condition:-}")"
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local condition="$1"
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[[ -z "$condition" ]] && continue
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[[ "$condition" =~ ^# ]] && continue
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local variable
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local operator
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local expected
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local actual
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read -r variable operator expected <<< "$condition"
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#
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# Validate condition format
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#
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if [[ -z "${variable:-}" || -z "${operator:-}" || -z "${expected:-}" ]]; then
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echo "Invalid condition: $condition"
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exit 1
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return 1
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fi
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if [[ ! -v context["$variable"] ]]; then
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echo "Unknown context variable '$variable'"
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exit 1
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return 1
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fi
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actual="${context[$variable]}"
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@@ -54,63 +62,78 @@ while IFS= read -r condition; do
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case "$operator" in
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"==")
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[[ "$actual" == "$expected" ]] && matched=true
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[[ "$actual" == "$expected" ]]
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;;
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"!=")
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[[ "$actual" != "$expected" ]] && matched=true
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[[ "$actual" != "$expected" ]]
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;;
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">"|">="|"<"|"<=")
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#
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# Numeric comparisons only
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#
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if [[ ! "$actual" =~ ^-?[0-9]+$ ]]; then
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echo "Numeric operator '$operator' requires integer value. Actual: '$actual'"
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exit 1
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return 1
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fi
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if [[ ! "$expected" =~ ^-?[0-9]+$ ]]; then
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echo "Numeric operator '$operator' requires integer comparison value. Expected: '$expected'"
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exit 1
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echo "Numeric operator '$operator' requires integer value. Expected: '$expected'"
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return 1
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fi
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case "$operator" in
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">")
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(( actual > expected )) && matched=true
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(( actual > expected ))
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;;
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">=")
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(( actual >= expected )) && matched=true
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(( actual >= expected ))
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;;
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"<")
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(( actual < expected )) && matched=true
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(( actual < expected ))
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;;
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"<=")
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(( actual <= expected )) && matched=true
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(( actual <= expected ))
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;;
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esac
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;;
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*)
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echo "Unsupported operator: $operator"
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exit 1
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return 1
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;;
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esac
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#
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# OR logic:
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# stop at first match
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#
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[[ "$matched" == true ]] && break
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done <<< "$CONDITIONS"
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}
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#
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# Set outputs
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# Evaluate list of conditions
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#
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if [[ "$matched" == true ]]; then
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# Conditions are OR'd together
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#
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evaluate_conditions() {
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local matched=false
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while IFS= read -r condition; do
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condition="$(trim "${condition:-}")"
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[[ -z "$condition" ]] && continue
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[[ "$condition" =~ ^# ]] && continue
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if evaluate_condition "$condition"; then
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matched=true
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break
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fi
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done <<< "$CONDITIONS"
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[[ "$matched" == true ]]
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}
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#
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# Write outputs
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#
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apply_variables() {
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while IFS= read -r output; do
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@@ -119,23 +142,36 @@ if [[ "$matched" == true ]]; then
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[[ -z "$output" ]] && continue
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[[ "$output" =~ ^# ]] && continue
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#
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# Validate output syntax
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#
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if [[ ! "$output" =~ ^[A-Za-z_][A-Za-z0-9_]*= ]]; then
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echo "Invalid variable definition: $output"
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exit 1
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return 1
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fi
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echo "$output" >> "$GITHUB_OUTPUT"
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done <<< "$VARIABLES"
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}
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fi
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#
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# Main
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#
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main() {
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if [[ "$matched" == false && "$FAIL_ON_NO_MATCH" == "true" ]]; then
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echo "No conditions matched"
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exit 1
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fi
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load_context
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echo "matched=$matched" >> "$GITHUB_OUTPUT"
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local matched=false
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if evaluate_conditions; then
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matched=true
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apply_variables
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fi
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if [[ "$matched" == false && "$FAIL_ON_NO_MATCH" == "true" ]]; then
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echo "No conditions matched"
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exit 1
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fi
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echo "matched=$matched" >> "$GITHUB_OUTPUT"
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}
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main
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