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diff --git a/java/src/main/java/org/softwareheritage/graph/utils/FindEarliestRevision.java b/java/src/main/java/org/softwareheritage/graph/utils/FindEarliestRevision.java
--- a/java/src/main/java/org/softwareheritage/graph/utils/FindEarliestRevision.java
+++ b/java/src/main/java/org/softwareheritage/graph/utils/FindEarliestRevision.java
@@ -1,3 +1,8 @@
+// SPDX-FileCopyrightText: (C) 2021 Antoine Pietri
+// SPDX-FileCopyrightText: (C) 2021 Stefano Zacchiroli
+
+// SPDX-License-Identifier: GPL-3.0-or-later
+
package org.softwareheritage.graph.utils;
import it.unimi.dsi.big.webgraph.LazyLongIterator;
@@ -51,10 +56,13 @@
String rawSWHID = null;
SWHID srcSWHID = null;
long lineCount = 0;
+ long srcNodeId = -1;
if (timing) {
System.err.println("starting SWHID processing...");
elapsed = Duration.ZERO;
}
+ // print TSV header line
+ System.out.println("obj_swhid\tearliest_swhid\tearliest_ts\trev_occurrences");
while (stdin.hasNextLine()) {
if (timing)
ts = System.nanoTime();
@@ -66,7 +74,12 @@
System.err.println(String.format("skipping invalid SWHID %s on line %d", rawSWHID, lineCount));
continue;
}
- long srcNodeId = graph.getNodeId(srcSWHID);
+ try {
+ srcNodeId = graph.getNodeId(srcSWHID);
+ } catch (IllegalArgumentException e) {
+ System.err.println(String.format("skipping unknown SWHID %s on line %d", rawSWHID, lineCount));
+ continue;
+ }
if (timing)
System.err.println("starting traversal for: " + srcSWHID.toString());
@@ -77,11 +90,15 @@
long minRevId = -1;
long minTimestamp = Long.MAX_VALUE;
+ long visitedRevisions = 0;
while (!stack.isEmpty()) {
long currentNodeId = stack.pop();
if (graph.getNodeType(currentNodeId) == Node.Type.REV) {
+ visitedRevisions++;
long committerTs = BigArrays.get(committerTimestamps, currentNodeId);
- if (committerTs < minTimestamp) {
+ if (committerTs < minTimestamp && committerTs != Long.MIN_VALUE && committerTs != 0) {
+ // exclude missing and zero (= epoch) as plausible earliest timestamps
+ // as they are almost certainly bogus values
minRevId = currentNodeId;
minTimestamp = committerTs;
}
@@ -99,7 +116,8 @@
if (minRevId == -1) {
System.err.println("no revision found containing: " + srcSWHID.toString());
} else {
- System.out.println(srcSWHID.toString() + "\t" + graph.getSWHID(minRevId).toString());
+ System.out.println(srcSWHID.toString() + "\t" + graph.getSWHID(minRevId).toString() + "\t"
+ + Long.toString(minTimestamp) + "\t" + Long.toString(visitedRevisions));
}
if (timing) {
elapsedNanos = System.nanoTime() - ts; // processing time for current SWHID

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