Source: qt4-x11 Version: 4:4.8.7+dfsg-2 Severity: wishlist Tags: patch User: reproducible-builds@lists.alioth.debian.org Usertags: toolchain timestamps X-Debbugs-Cc: reproducible-builds@lists.alioth.debian.org
Hi, While working on the "reproducible builds" effort [1], we have noticed that the qhelpgenerator tool from qt4-x11 embeds timestamps on the creation of qch files. For the Reproducible Builds effort we are proposing an environment variable (SOURCE_DATE_EPOCH) [2] that will contain a deterministic epoch timestamp (based on the latest debian/changelog entry) that could be used, which should be automatically exported by debhelper in the future [3]. The attached patch proposes a way to use this variable to get reproducible timestamps in the qch files generated by qhelpgenerator, if the variable has been set (if not, it falls back to the old behavior). With the attached patch packages using qhelpgenerator would then automatically embed reproducible timestamps in qch files. [1]: https://wiki.debian.org/ReproducibleBuilds [2]: https://wiki.debian.org/ReproducibleBuilds/TimestampsProposal [3]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=791815 Regards, -- Dhole
diff -Nru qt4-x11-4.8.7+dfsg/debian/changelog
qt4-x11-4.8.7+dfsg/debian/changelog
--- qt4-x11-4.8.7+dfsg/debian/changelog 2015-08-02 22:01:18.000000000 +0200
+++ qt4-x11-4.8.7+dfsg/debian/changelog 2015-08-04 15:19:05.000000000 +0200
@@ -1,3 +1,11 @@
+qt4-x11 (4:4.8.7+dfsg-2.0~reproducible1) UNRELEASED; urgency=medium
+
+ * Non-maintainer upload.
+ * Add support for reproducible builds by using $SOURCE_DATE_EPOCH as the
+ embedded timestamps in qch files generated with qhelpgenerator.
+
+ -- Eduard Sanou <dh...@openmailbox.org> Tue, 04 Aug 2015 15:17:35 +0200
+
qt4-x11 (4:4.8.7+dfsg-2) experimental; urgency=medium
* Add Daniel Schepler's QtScript_x32_config.diff and x32.diff to let Qt4
diff -Nru
qt4-x11-4.8.7+dfsg/debian/patches/Replace_timestamp_with_SOURCE_DATE_EPOCH_in_qhelpgenerator.patch
qt4-x11-4.8.7+dfsg/debian/patches/Replace_timestamp_with_SOURCE_DATE_EPOCH_in_qhelpgenerator.patch
---
qt4-x11-4.8.7+dfsg/debian/patches/Replace_timestamp_with_SOURCE_DATE_EPOCH_in_qhelpgenerator.patch
1970-01-01 01:00:00.000000000 +0100
+++
qt4-x11-4.8.7+dfsg/debian/patches/Replace_timestamp_with_SOURCE_DATE_EPOCH_in_qhelpgenerator.patch
2015-08-04 15:41:15.000000000 +0200
@@ -0,0 +1,102 @@
+Description: Allow the timestamps from qhelpgenerator to be externally set
+ In order to make qhelpgenerator output reproducible, we need a way to
+ set the embedded timestamps to other values than the current time.
+ We define a new method for QDateTime (reproducibleDateTime) that returns
+ a deterministic datetime object when the SOURCE_DATE_EPOCH environment
+ variable is set with a unix epoch timestamp, containing the datetime
+ defined by SOURCE_DATE_EPOCH in UTC. We replace some instances of
+ QDateTime::currentDateTime() by QDateTime::reproducibleDateTime() in the
+ sources of qhelpgenerator to make the output reproducible.
+Author: Eduard Sanou <dh...@openmailbox.org>
+
+--- qt4-x11-4.8.7+dfsg.orig/src/corelib/tools/qdatetime.cpp
++++ qt4-x11-4.8.7+dfsg/src/corelib/tools/qdatetime.cpp
+@@ -2892,6 +2892,15 @@ bool QDateTime::operator<(const QDateTim
+ */
+
+ /*!
++ \fn QDateTime QDateTime::reproducibleDateTime()
++ If the environment variable SOURCE_DATE_EPOCH containing a unix epoch date
++ is set, returns the datetime in SOURCE_DATE_EPOCH, in UTC.
++ If SOURCE_DATE_EPOCH is not set, behaves as QDateTime::currentDateTime().
++
++ \sa currentDateTimeUtc(), QDate::currentDate(), QTime::currentTime(),
toTimeSpec()
++*/
++
++/*!
+ \fn QDateTime QDateTime::currentDateTimeUtc()
+ \since 4.7
+ Returns the current datetime, as reported by the system clock, in
+@@ -3120,6 +3129,29 @@ QDateTime QDateTime::currentDateTime()
+ return dt;
+ }
+
++QDateTime QDateTime::reproducibleDateTime()
++{
++ QByteArray env_date;
++ QDateTime date;
++ bool env_date_ok;
++ long timestamp;
++
++ env_date = qgetenv("SOURCE_DATE_EPOCH");
++ if (env_date.length() != 0) {
++ timestamp = env_date.toLong(&env_date_ok, 10);
++ if (!env_date_ok) {
++ // "SOURCE_DATE_EPOCH is not a number!
++ timestamp = 0;
++ }
++ date = QDateTime::fromTime_t(timestamp).toUTC();
++ } else {
++ date = QDateTime::currentDateTime();
++ }
++
++ return date;
++}
++
++
+ QDateTime QDateTime::currentDateTimeUtc()
+ {
+ // posix compliant system
+--- qt4-x11-4.8.7+dfsg.orig/src/corelib/tools/qdatetime.h
++++ qt4-x11-4.8.7+dfsg/src/corelib/tools/qdatetime.h
+@@ -264,6 +264,7 @@ public:
+ int utcOffset() const;
+
+ static QDateTime currentDateTime();
++ static QDateTime reproducibleDateTime();
+ static QDateTime currentDateTimeUtc();
+ #ifndef QT_NO_DATESTRING
+ static QDateTime fromString(const QString &s, Qt::DateFormat f =
Qt::TextDate);
+--- qt4-x11-4.8.7+dfsg.orig/tools/assistant/lib/qhelpgenerator.cpp
++++ qt4-x11-4.8.7+dfsg/tools/assistant/lib/qhelpgenerator.cpp
+@@ -381,7 +381,7 @@ bool QHelpGenerator::createTables()
+ d->query->exec(QLatin1String("INSERT INTO MetaDataTable
VALUES('qchVersion', '1.0')"));
+
+ d->query->prepare(QLatin1String("INSERT INTO MetaDataTable
VALUES('CreationDate', ?)"));
+- d->query->bindValue(0,
QDateTime::currentDateTime().toString(Qt::ISODate));
++ d->query->bindValue(0,
QDateTime::reproducibleDateTime().toString(Qt::ISODate));
+ d->query->exec();
+
+ return true;
+--- qt4-x11-4.8.7+dfsg.orig/tools/assistant/tools/qcollectiongenerator/main.cpp
++++ qt4-x11-4.8.7+dfsg/tools/assistant/tools/qcollectiongenerator/main.cpp
+@@ -521,7 +521,7 @@ int main(int argc, char *argv[])
+ CollectionConfiguration::setAddressBarVisible(helpEngine,
+ !config.hideAddressBar());
+ CollectionConfiguration::setCreationTime(helpEngine,
+- QDateTime::currentDateTime().toTime_t());
++ QDateTime::reproducibleDateTime().toTime_t());
+ CollectionConfiguration::setFullTextSearchFallbackEnabled(helpEngine,
+ config.fullTextSearchFallbackEnabled());
+
+---
qt4-x11-4.8.7+dfsg.orig/tools/assistant/tools/shared/collectionconfiguration.cpp
++++ qt4-x11-4.8.7+dfsg/tools/assistant/tools/shared/collectionconfiguration.cpp
+@@ -282,7 +282,7 @@ const QDateTime CollectionConfiguration:
+
+ void CollectionConfiguration::updateLastRegisterTime(QHelpEngineCore
&helpEngine)
+ {
+- helpEngine.setCustomValue(LastRegisterTime, QDateTime::currentDateTime());
++ helpEngine.setCustomValue(LastRegisterTime,
QDateTime::reproducibleDateTime());
+ }
+
+ bool CollectionConfiguration::isNewer(const QHelpEngineCore &newer,
diff -Nru qt4-x11-4.8.7+dfsg/debian/patches/series
qt4-x11-4.8.7+dfsg/debian/patches/series
--- qt4-x11-4.8.7+dfsg/debian/patches/series 2015-08-02 20:14:37.000000000
+0200
+++ qt4-x11-4.8.7+dfsg/debian/patches/series 2015-08-04 15:34:59.000000000
+0200
@@ -55,3 +55,4 @@
parisc-atomic.patch
QtScript_x32_config.diff
x32.diff
+Replace_timestamp_with_SOURCE_DATE_EPOCH_in_qhelpgenerator.patch
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