[libspi-java] 03/05: Add support for SOURCE_DATE_EPOCH for reproducible builds

[Tony Mancill]

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tmancill pushed a commit to branch master
in repository libspi-java.

commit 6bd852d1441cb50892c42711674a02bede30636e
Author: tony mancill <tmancill at debian.org>
Date:   Sun Aug 13 20:35:39 2017 -0700

    Add support for SOURCE_DATE_EPOCH for reproducible builds
---
 debian/patches/series                  |  1 +
 debian/patches/source-date-epoch.patch | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/debian/patches/series b/debian/patches/series
new file mode 100644
index 0000000..f84bed2
--- /dev/null
+++ b/debian/patches/series
@@ -0,0 +1 @@
+source-date-epoch.patch
diff --git a/debian/patches/source-date-epoch.patch b/debian/patches/source-date-epoch.patch
new file mode 100644
index 0000000..8aa931e
--- /dev/null
+++ b/debian/patches/source-date-epoch.patch
@@ -0,0 +1,34 @@
+Description: add support SOURCE_DATE_EPOCH
+ See: https://reproducible-builds.org/specs/source-date-epoch/
+Author: tony mancill <tmancill at debian.org>
+Last-Update: 2017-08-13
+
+--- a/src/org/mangosdk/spi/processor/Persistence.java
++++ b/src/org/mangosdk/spi/processor/Persistence.java
+@@ -132,7 +132,7 @@
+ 		Writer writer = output.openWriter();
+ 		try {
+ 			writer.write("# Generated by " + name + "\n");
+-			writer.write("# " + new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z", Locale.US).format(new Date()) + "\n");
++			writer.write("# " + new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss Z", Locale.US).format(getBuildDate()) + "\n");
+ 			writer.write(value);
+ 		}
+ 		finally {
+@@ -144,4 +144,17 @@
+ 			}
+ 		}
+ 	}
++
++	// return build timestamp, either the value of SOURCE_DATE_EPOCH 
++	// in milliseconds or the current system time in milliseconds
++	// see: https://reproducible-builds.org/specs/source-date-epoch/
++	private long getBuildDate() {
++		try {
++			return Long.valueOf(System.getenv("SOURCE_DATE_EPOCH")) * 1000L;
++		}
++		catch (Exception e) {
++			// ignore any problems retrieving or casting SOURCE_DATE_EPOCH
++		}
++		return System.currentTimeMillis();
++	}
+ }

-- 
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