9ee7d03e1c
package to read, consume, and analyze license metadata and dependency graph. Bug: 68860345 Bug: 151177513 Bug: 151953481 Change-Id: Ic08406fa2250a08ad26f2167d934f841c95d9148
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright 2021 Google LLC
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package compliance
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// ShippedNodes returns the set of nodes in a license graph where the target or
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// a derivative work gets distributed. (caches result)
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func ShippedNodes(lg *LicenseGraph) *TargetNodeSet {
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lg.mu.Lock()
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shipped := lg.shippedNodes
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lg.mu.Unlock()
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if shipped != nil {
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return shipped
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}
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tset := make(map[*TargetNode]bool)
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WalkTopDown(lg, func(lg *LicenseGraph, tn *TargetNode, path TargetEdgePath) bool {
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if _, alreadyWalked := tset[tn]; alreadyWalked {
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return false
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}
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if len(path) > 0 {
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if !edgeIsDerivation(path[len(path)-1]) {
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return false
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}
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}
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tset[tn] = true
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return true
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})
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shipped = &TargetNodeSet{tset}
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lg.mu.Lock()
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if lg.shippedNodes == nil {
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lg.shippedNodes = shipped
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} else {
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// if we end up with 2, release the later for garbage collection.
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shipped = lg.shippedNodes
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}
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lg.mu.Unlock()
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return shipped
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}
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