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#1 2013-05-12 14:44:27

kabads
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Registered: 2012-09-22
Posts: 139
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[Solved] Checking which packages will update pacman -Syu --dry-run?

Is it possible to run pacman -Syu (with different flags) and see which packages will update without having to go through it? I've looked at man pacman and didn't see anything obvious.

TIA.

Last edited by kabads (2013-05-13 03:22:25)

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#2 2013-05-12 14:48:50

lucke
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From: Poland
Registered: 2004-11-30
Posts: 4,018

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

When you use -S or -R, pacman tells you what it would do and asks whether you want to proceed. You can use VerbosePkgLists and TotalDownload in pacman.conf for more info.

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#3 2013-05-12 14:57:35

karol
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Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Use 'checkupdates'.

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#4 2013-05-12 17:20:50

x33a
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Registered: 2009-08-15
Posts: 3,346
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Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

@ karol, what is checkupdates?

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#5 2013-05-12 17:23:39

karol
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Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

'checkupdates -h'.

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#6 2013-05-12 17:40:36

x33a
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Registered: 2009-08-15
Posts: 3,346
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Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Woah, when did it make into pacman? 4.1.1, I suppose.

I thought it was an option in pacman.conf, but since I had already merged the pacnew, I was not so sure.

Edit: Err.. I meant pacman 4.1.0

Last edited by x33a (2013-05-12 17:49:30)

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#7 2013-05-12 17:43:45

karol
Archivist
Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

It was introduces in pacman 4.1.0:  https://projects.archlinux.org/pacman.git/tree/NEWS#n84 based on keenerd's checkupdates https://bbs.archlinux.org/viewtopic.php … 5#p1072495

$ pkgfile -v checkupdates
core/pacman 4.1.0-2	/usr/bin/checkupdates
$ less /usr/bin/checkupdates

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#8 2013-05-12 17:45:24

David Batson
Member
Registered: 2011-10-13
Posts: 640

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

I just run "pacman -Syu" and choose no to accept the updates.  Perhaps a little more risky than other methods (if you hit the wrong key).

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#9 2013-05-12 17:51:15

x33a
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Registered: 2009-08-15
Posts: 3,346
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Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Thanks for the info karol, just tried it and it looks good. A verbose switch to show the db download progress would be great, but that should be reported to keenerd wink

Last edited by x33a (2013-05-12 17:51:49)

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#10 2013-05-12 18:00:44

jasonwryan
Forum & Wiki Admin
From: .nz
Registered: 2009-05-09
Posts: 18,787
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Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

David Batson wrote:

I just run "pacman -Syu" and choose no to accept the updates.  Perhaps a little more risky than other methods (if you hit the wrong key).

This is the same as running pacman -Sy $package and can cause issues. Use checkupdates, that is what it is there for...


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#11 2013-05-12 18:06:47

ewaller
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From: Pasadena, CA
Registered: 2009-07-13
Posts: 12,936

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Hey Jason,
I don't think he meant to ignore the messages where you replace one package with another.  I think he meant when it finally gives you the long list of what is going to be updated, decline everything and abort.
Eric


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Like you, I have no idea what you are doing, but I am pretty sure it is wrong...Jasonwryan
----
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#12 2013-05-12 18:09:19

falconindy
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From: New York, USA
Registered: 2009-10-22
Posts: 4,094
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Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

ewaller wrote:

Hey Jason,
I don't think he meant to ignore the messages where you replace one package with another.  I think he meant when it finally gives you the long list of what is going to be updated, decline everything and abort.
Eric

Which is the same as running 'pacman -Sy' + 'pacman -Qu' and is Considered Harmful™.

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#13 2013-05-12 18:15:35

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 12,936

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Wow, I am missing something.  I clearly have some research to do. 

What I would expect is that first, the cache is updated.  Then dependencies resolved, and then a list of files is presented that will be changed if you press 'y' or return.  I would think that pressing 'N' would cause Pacman to terminate without updating anything except the cache.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Like you, I have no idea what you are doing, but I am pretty sure it is wrong...Jasonwryan
----
How to Ask Questions the Smart Way

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#14 2013-05-12 18:34:36

karol
Archivist
Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

ewaller wrote:

Wow, I am missing something.  I clearly have some research to do. 

What I would expect is that first, the cache is updated.  Then dependencies resolved, and then a list of files is presented that will be changed if you press 'y' or return.  I would think that pressing 'N' would cause Pacman to terminate without updating anything except the cache.

Updating sync dbs and installing some packages 'pacman -Sy foo' may result in a broken system. 'pacman -Sy'  or 'pacman -Syu' + answering 'n' to the question is not a problem but may lead to problems, so it's best to avoid it.

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#15 2013-05-12 18:42:33

ewaller
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From: Pasadena, CA
Registered: 2009-07-13
Posts: 12,936

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

karol wrote:

Updating sync dbs and installing some packages 'pacman -Sy foo' may result in a broken system.

That is an absolute truth and cannot be overemphasised

'pacman -Sy'  or 'pacman -Syu' + answering 'n' to the question is not a problem but may lead to problems, so it's best to avoid it.

But this seems to contradict what Jason and Falconindy are saying.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Like you, I have no idea what you are doing, but I am pretty sure it is wrong...Jasonwryan
----
How to Ask Questions the Smart Way

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#16 2013-05-12 18:49:17

karol
Archivist
Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Just as '-f' was removed to discourage people from using 'pacman -Syuf', it's easier to say that 'pacman -Sy' is bad, even thought the problem is 'pacman -Sy foo' i.e. 'pacman -Sy' + 'pacman -S foo'.

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#17 2013-05-12 18:54:15

David Batson
Member
Registered: 2011-10-13
Posts: 640

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

I was having difficulty understanding why using pacman -Syu and then aborting would be a problem.  After searching a little, I found the following thread from a couple of years ago that explains it well.

https://bbs.archlinux.org/viewtopic.php?id=89328

AFAICT, the problem only surfaces if you run pacman -Syu, abort, then later try to install individual packages without updating your system first.

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#18 2013-05-12 18:57:29

karol
Archivist
Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

David Batson wrote:

I was having difficulty understanding why using pacman -Syu and then aborting would be a problem.  After searching a little, I found the following thread from a couple of years ago that explains it well.

https://bbs.archlinux.org/viewtopic.php?id=89328

AFAICT, the problem only surfaces if you run pacman -Syu, abort, then later try to install individual packages without updating your system first.

Not exactly, as I posted above, running 'pacman -Sy' is bad too.

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#19 2013-05-12 19:00:37

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 12,936

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Okay that makes sense.  Any time one updates the cache, but leaves older version of programs installed, the next time someone goes to install a new package there exists the possibility of generating a 'partial update' situation.  But should that not be caught during the resolution of dependencies?


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Like you, I have no idea what you are doing, but I am pretty sure it is wrong...Jasonwryan
----
How to Ask Questions the Smart Way

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#20 2013-05-12 19:16:35

karol
Archivist
Registered: 2009-05-06
Posts: 25,428

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

If the applications you have installed don't have e.g. libpng as a versioned dependency, doing 'pacman -Sy foo' might pull the new version of the library, which will bread everything but 'foo'.

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#21 2013-05-12 21:12:45

kabads
Member
Registered: 2012-09-22
Posts: 139
Website

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Thanks guys - checkupdates is exactly what I wanted.

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#22 2013-05-12 22:37:13

Allan
Developer
From: Brisbane, AU
Registered: 2007-06-09
Posts: 10,408
Website

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

ewaller wrote:

But should that not be caught during the resolution of dependencies?

It could, but Arch does not support doing that. We do not use exact versions in our dependencies.

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#23 2013-05-12 23:16:24

ewaller
Administrator
From: Pasadena, CA
Registered: 2009-07-13
Posts: 12,936

Re: [Solved] Checking which packages will update pacman -Syu --dry-run?

Allan wrote:

It could, but Arch does not support doing that. We do not use exact versions in our dependencies.

<paradigm shift> How long have I been here, and how is it that has not ever occurred to me before? <That was meant to be a rhetorical question>
Thanks Allan.


Nothing is too wonderful to be true, if it be consistent with the laws of nature -- Michael Faraday
Like you, I have no idea what you are doing, but I am pretty sure it is wrong...Jasonwryan
----
How to Ask Questions the Smart Way

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