[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Carl Dong]

From 2b3162dde22a5d44eb5910b0fcfa07318f935aaf Mon Sep 17 00:00:00 2001
From: Carl Dong <accounts@carldong.me>
Date: Mon, 21 Jan 2019 14:51:57 -0500
Subject: [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

* gnu/packages/finance.scm: Make bitcoin-qt deterministic.
---
 gnu/packages/finance.scm | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gnu/packages/finance.scm b/gnu/packages/finance.scm
index 468388797..96df919c4 100644
--- a/gnu/packages/finance.scm
+++ b/gnu/packages/finance.scm
@@ -115,6 +115,9 @@
                          "/bin/lupdate"))
        #:phases
         (modify-phases %standard-phases
+          (add-before 'configure 'qt-time
+           (lambda _
+            (setenv "QT_RCC_SOURCE_DATE_OVERRIDE" "1"))) ; Make QT deterministic
           (add-before 'check 'set-home
            (lambda _
             (setenv "HOME" (getenv "TMPDIR"))))))) ; Tests write to $HOME.
--
2.20.1

bug#34165: [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Danny Milosavljevic]

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Thanks!

Pushed this as commit 99629e5a110a9a91151bd0e63a1805446996a3c8 to guix master.

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[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Ludovic Courtès]

Hi!

Carl Dong <contact@carldong.me> skribis:

>>From 2b3162dde22a5d44eb5910b0fcfa07318f935aaf Mon Sep 17 00:00:00 2001
> From: Carl Dong <accounts@carldong.me>
> Date: Mon, 21 Jan 2019 14:51:57 -0500
> Subject: [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[...]

> +          (add-before 'configure 'qt-time
> +           (lambda _
> +            (setenv "QT_RCC_SOURCE_DATE_OVERRIDE" "1"))) ; Make QT deterministic

Looking at this and the upstream commit¹, I’m thinking maybe we should
do the same in other Qt applications.  Any idea how we can identify
applications where it’s needed?

Thanks,
Ludo’.

¹ https://github.com/qt/qtbase/commit/38271e9298dcf48652a6e2e08414a940a97867fa

[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Ricardo Wurmus]

Ludovic Courtès <ludo@gnu.org> writes:

> Hi!
>
> Carl Dong <contact@carldong.me> skribis:
>
>>>From 2b3162dde22a5d44eb5910b0fcfa07318f935aaf Mon Sep 17 00:00:00 2001
>> From: Carl Dong <accounts@carldong.me>
>> Date: Mon, 21 Jan 2019 14:51:57 -0500
>> Subject: [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.
>
> [...]
>
>> +          (add-before 'configure 'qt-time
>> +           (lambda _
>> +            (setenv "QT_RCC_SOURCE_DATE_OVERRIDE" "1"))) ; Make QT deterministic
>
> Looking at this and the upstream commit¹, I’m thinking maybe we should
> do the same in other Qt applications.  Any idea how we can identify
> applications where it’s needed?
>
> ¹
> https://github.com/qt/qtbase/commit/38271e9298dcf48652a6e2e08414a940a97867fa

This is a bit unfortunate.  It seems to me that the original intent of
the patch was to support SOURCE_DATE_EPOCH as the commit message
mentions that variable’s specification.  Pity that it is now a custom Qt
variable.

This probably should be used for all packages that generate resource
files, which I assume are most non-trivial applications.  I think it’s
fine to add it to all packages using qtbase.

--
Ricardo

[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Efraim Flashner]

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On Wed, Jan 23, 2019 at 03:41:43PM +0100, Ricardo Wurmus wrote:
> 
> 
> This is a bit unfortunate.  It seems to me that the original intent of
> the patch was to support SOURCE_DATE_EPOCH as the commit message
> mentions that variable’s specification.  Pity that it is now a custom Qt
> variable.
> 

We could just add it in to the gnu-build-system and set the variable in
all events. Or patch qt/qtbase to accept SOURCE_DATE_EPOCH in place of
their own variable.

-- 
Efraim Flashner   <efraim@flashner.co.il>   אפרים פלשנר
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[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Ludovic Courtès]

Efraim Flashner <efraim@flashner.co.il> skribis:

> On Wed, Jan 23, 2019 at 03:41:43PM +0100, Ricardo Wurmus wrote:
>> 
>> 
>> This is a bit unfortunate.  It seems to me that the original intent of
>> the patch was to support SOURCE_DATE_EPOCH as the commit message
>> mentions that variable’s specification.  Pity that it is now a custom Qt
>> variable.
>> 
>
> We could just add it in to the gnu-build-system and set the variable in
> all events. Or patch qt/qtbase to accept SOURCE_DATE_EPOCH in place of
> their own variable.

Either way is fine with me.  Adding it to the ‘set-SOURCE-DATE-EPOCH’
phase in ‘core-updates’ would be reasonable IMO.

Ludo’.

[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Danny Milosavljevic]

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Hi,

> > https://github.com/qt/qtbase/commit/38271e9298dcf48652a6e2e08414a940a97867fa  
> 
> This is a bit unfortunate.  It seems to me that the original intent of
> the patch was to support SOURCE_DATE_EPOCH as the commit message
> mentions that variable’s specification.  Pity that it is now a custom Qt
> variable.

I asked them and they said [1]:

>There was a policy to prefix variables with QT_ and I did not want to discuss more with the reviewer.
>But later, this was merged:
>https://codereview.qt-project.org/#/c/243636/4/src/tools/rcc/rcc.cpp,unified

[1] https://github.com/qt/qtbase/commit/38271e9298dcf48652a6e2e08414a940a97867fa#commitcomment-32085478

https://codereview.qt-project.org/#/c/243636/4/src/tools/rcc/rcc.cpp,unified contains the following patch:

...
228	228	         const QDateTime lastModified = m_fileInfo.lastModified();
	229	229	         quint64 lastmod = quint64(lastModified.isValid() ? lastModified.toMSecsSinceEpoch() : 0);
	230	230	         static const quint64 sourceDate = 1000 * qgetenv("QT_RCC_SOURCE_DATE_OVERRIDE").toULongLong(
);
	231	231	         if (sourceDate != 0)
	232	232	             lastmod = sourceDate;
		233	+        static const quint64 sourceDate2 = 1000 * qgetenv("SOURCE_DATE_EPOCH").toULongLong();
		234	+        if (sourceDate2 != 0)
		235	+            lastmod = sourceDate2;

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[bug#34165] [PATCH] gnu: bitcoin-core: Make bitcoin-qt deterministic.

[Ludovic Courtès]

Hi Danny,

Danny Milosavljevic <dannym@scratchpost.org> skribis:

> [1] https://github.com/qt/qtbase/commit/38271e9298dcf48652a6e2e08414a940a97867fa#commitcomment-32085478
>
> https://codereview.qt-project.org/#/c/243636/4/src/tools/rcc/rcc.cpp,unified contains the following patch:
>
> ...
> 228	228	         const QDateTime lastModified = m_fileInfo.lastModified();
> 	229	229	         quint64 lastmod = quint64(lastModified.isValid() ? lastModified.toMSecsSinceEpoch() : 0);
> 	230	230	         static const quint64 sourceDate = 1000 * qgetenv("QT_RCC_SOURCE_DATE_OVERRIDE").toULongLong(
> );
> 	231	231	         if (sourceDate != 0)
> 	232	232	             lastmod = sourceDate;
> 		233	+        static const quint64 sourceDate2 = 1000 * qgetenv("SOURCE_DATE_EPOCH").toULongLong();
> 		234	+        if (sourceDate2 != 0)
> 		235	+            lastmod = sourceDate2;

Nice, so maybe we don’t need to change anything and just wait for the
next Qt version?

Ludo’.