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Description: Makes the timestamp in the properties files header reproducible when SOURCE_DATE_EPOCH is specified
Author: Emmanuel Bourg <ebourg@apache.org>
Forwarded: no
--- a/src/java.base/share/classes/java/util/Properties.java
+++ b/src/java.base/share/classes/java/util/Properties.java
@@ -53,6 +53,9 @@
import sun.nio.cs.UTF_8;
import sun.nio.cs.ISO_8859_1;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
+
/**
* The {@code Properties} class represents a persistent set of
* properties. The {@code Properties} can be saved to a stream
@@ -929,7 +932,7 @@
if (comments != null) {
writeComments(bw, comments);
}
- bw.write("#" + new Date().toString());
+ bw.write("#" + getFormattedTimestamp());
bw.newLine();
synchronized (this) {
for (Map.Entry<Object, Object> e : entrySet()) {
@@ -1579,4 +1582,27 @@
}
this.map = map;
}
+
+ /**
+ * Returns a formatted timestamp to be used in the properties file header.
+ * The date used is the current date, unless the SOURCE_DATE_EPOCH
+ * environment variable is specified. In this case the format used is
+ * locale and timezone insensitive to ensure the output is reproducible.
+ */
+ @SuppressWarnings("removal")
+ private String getFormattedTimestamp() {
+ String epoch = AccessController.doPrivileged(new PrivilegedAction<String>(){
+ public String run() { return System.getenv("SOURCE_DATE_EPOCH"); }
+ });
+
+ if (epoch == null) {
+ return new Date().toString();
+ } else {
+ // Use the SOURCE_DATE_EPOCH timestamp and make the format locale/timezone insensitive
+ java.text.SimpleDateFormat fmt = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss z", java.util.Locale.ENGLISH);
+ fmt.setTimeZone(java.util.TimeZone.getTimeZone("UTC"));
+ Date date = new Date(1000 * Long.parseLong(epoch));
+ return fmt.format(date);
+ }
+ }
}
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