G2-1865 Preserve bulldozer temp files during release process

bd-build/src/main/java/com/g2forge/bulldozer/build/Release.java

@@ -257,6 +257,7 @@ public IExit invoke() throws Throwable {
 					switchToBranch(git);
 					// Commit any changes from a past prepare
 					commitUpstreamReversion(git);
+					project.preserveTemp();
 
 					// Prepare the project (stream stdio to the console)
 					getContext().getMaven().releasePrepare(project.getDirectory(), releaseProperties.getTag(), releaseProperties.getRelease(), releaseProperties.getDevelopment(), IMaven.PROFILES_RELEASE);
@@ -282,7 +283,7 @@ public IExit invoke() throws Throwable {
 						try {
 							// Skip ourselves & projects that don't depend on us
 							if ((downstream == project) || !downstream.getDependencies().getTransitive().keySet().contains(name)) continue;
-							log.info("\tFound downstream{}", downstream.getName());
+							log.info("\tFound downstream {}", downstream.getName());
 							// Record that we're updating this project so it needs to be re-installed at the end
 							unreleasedProjectsToReinstall.add(downstream.getName());
 							// Update all the downstreams to new release versions
@@ -352,6 +353,7 @@ public IExit invoke() throws Throwable {
 				// Commit anything dirty, since those are the things with version updates
 				switchToBranch(project.getGit());
 				commitUpstreamReversion(project.getGit());
+				project.preserveTemp();
 			}
 
 			// Re-install all the downstream projects that have had updated upstreams

bd-build/src/main/java/com/g2forge/bulldozer/build/model/BulldozerProject.java

@@ -103,6 +103,14 @@ public void close() {
 		HIO.closeAll(getCloseables());
 	}
 
+	protected String computeCommit() {
+		try {
+			return getGit().getRepository().findRef(Constants.HEAD).getObjectId().getName();
+		} catch (IOException exception) {
+			throw new RuntimeIOException(String.format("Failed to determine commit for %1$s!", getName()), exception);
+		}
+	}
+
 	protected BulldozerDependencies computeDependencies() {
 		final Map<String, ? extends BulldozerProject> nameToProject = getContext().getNameToProject();
 		final Map<String, ? extends BulldozerProject> groupToProject = getContext().getGroupToProject();
@@ -190,28 +198,20 @@ public String getName() {
 	}
 
 	public <T> T loadTemp(IFunction1<BulldozerTemp, T> getter, IConsumer2<BulldozerTemp, T> setter, ISupplier<T> generator) {
-		final String commit;
-		try {
-			commit = getGit().getRepository().findRef(Constants.HEAD).getObjectId().getName();
-		} catch (IOException exception) {
-			throw new RuntimeIOException(String.format("Failed to determine commit for %1$s!", getName()), exception);
-		}
+		final String commit = computeCommit();
 
 		final Path path = getDirectory().resolve(BulldozerTemp.BULLDOZER_TEMP);
 		BulldozerTemp temp = null;
 		if (Files.exists(path)) {
 			try {
 				final BulldozerTemp read = getContext().getObjectMapper().readValue(path.toFile(), BulldozerTemp.class);
-				if (read.getKey().equals(commit)) temp = read;
+				if (read.isValidForCommit(commit)) temp = read;
 				else Files.delete(path);
 			} catch (IOException exception) {
 				log.warn(String.format("Failed to read bulldozer temp data for %1$s, will regenerate...", getName()));
 			}
 		}
-		if (temp == null) {
-			temp = new BulldozerTemp();
-			temp.setKey(commit);
-		}
+		if (temp == null) temp = BulldozerTemp.builder().commit(commit).build();
 		final T retVal0 = getter.apply(temp);
 		if (retVal0 != null) return retVal0;
 
@@ -229,4 +229,21 @@ public <T> T loadTemp(IFunction1<BulldozerTemp, T> getter, IConsumer2<BulldozerT
 		}
 		return retVal1;
 	}
+
+	public void preserveTemp() {
+		final String commit = computeCommit();
+
+		final Path path = getDirectory().resolve(BulldozerTemp.BULLDOZER_TEMP);
+		if (Files.exists(path)) {
+			try {
+				final BulldozerTemp read = getContext().getObjectMapper().readValue(path.toFile(), BulldozerTemp.class);
+				if (!read.isValidForCommit(commit)) {
+					final BulldozerTemp write = read.toBuilder().otherCommit(commit).build();
+					getContext().getObjectMapper().writeValue(path.toFile(), write);
+				}
+			} catch (IOException exception) {
+				log.warn(String.format("Failed to preserve bulldozer temp data for %1$s, will regenerate later...", getName()));
+			}
+		}
+	}
 }

bd-build/src/main/java/com/g2forge/bulldozer/build/model/BulldozerTemp.java

@@ -1,18 +1,24 @@
 package com.g2forge.bulldozer.build.model;
 
+import java.util.List;
+
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
 import lombok.RequiredArgsConstructor;
+import lombok.Singular;
 
 @Data
-@Builder
+@Builder(toBuilder = true)
 @AllArgsConstructor
 @RequiredArgsConstructor
 public class BulldozerTemp {
 	public static final String BULLDOZER_TEMP = "bulldozer-temp.json";
 
-	protected String key;
+	protected String commit;
+
+	@Singular
+	protected List<String> otherCommits;
 
 	protected String group;
 
@@ -21,4 +27,8 @@ public class BulldozerTemp {
 	protected BulldozerDependencies dependencies;
 
 	protected String parentGroup;
+
+	public boolean isValidForCommit(String commit) {
+		return getCommit().equals(commit) || ((getOtherCommits() != null) && getOtherCommits().contains(commit));
+	}
 }