[qemu-web PATCH] Fix installation instructions for Debian/Ubuntu

[qemu-web PATCH] Fix installation instructions for Debian/Ubuntu

[Thomas Huth]

There is no package called "qemu" here - thus use the two meta-packages
"qemu-system" and "qemu-user" instead.

Resolves: https://gitlab.com/qemu-project/qemu-web/-/issues/8
Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 _download/linux.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/_download/linux.md b/_download/linux.md
index 11ed695..bb76425 100644
--- a/_download/linux.md
+++ b/_download/linux.md
@@ -2,7 +2,7 @@ QEMU is packaged by most Linux distributions:
 
 * <strong>Arch:</strong> `pacman -S qemu`
 
-* <strong>Debian/Ubuntu:</strong> `apt-get install qemu`
+* <strong>Debian/Ubuntu:</strong> `apt-get install qemu-system qemu-user`
 
 * <strong>Fedora:</strong> `dnf install @virtualization`
 
-- 
2.39.3

Re: [qemu-web PATCH] Fix installation instructions for Debian/Ubuntu

[Michael Tokarev]

29.06.2023 11:02, Thomas Huth wrote:
> There is no package called "qemu" here - thus use the two meta-packages
> "qemu-system" and "qemu-user" instead.

There are 2 questions here.

1. Do we really want to suggest users to install the whole thing?
qemu-user and qemu-system are two entirely different beasts, used
for entirely different purposes.  This is exactly the reason why
I dropped `qemu' package from debian/ubuntu, - because effectively
there are two independent, entirely different packages.

Also 1.a, - again, whole qemu-system usually isn't needed. There are
another 2 big different classes here, - native thing (probably with
kvm), and foreign thing.

> Resolves: https://gitlab.com/qemu-project/qemu-web/-/issues/8
..> -* <strong>Debian/Ubuntu:</strong> `apt-get install qemu`
> +* <strong>Debian/Ubuntu:</strong> `apt-get install qemu-system qemu-user`

2.  There are 2 qemu-user packages on debian/ubuntu: it is qemu-user
and qemu-user-static. My guess is that most users actually need the latter,
at least this one lets to run foreign chroots without copying anything from
host system to a chroot.  In rare cases when one wants to install and run
foreign binaries directly into the host system, qemu-user is okay. But it
is a really rare case, and usually combined with running foreign chroots
anyway.

So I'd say this whole thing needs a bit more explanation, like,

  when you want to run qemu-system emulation, install qemu-system (meta)package.
  when you want user-mode emulation, install qemu-user-static package.

Or something like this.

This is actually a question to QEMU upstream, - I think the same reasoning
applies there as well.

Thanks,

/mjt

Re: [qemu-web PATCH] Fix installation instructions for Debian/Ubuntu

[Philippe Mathieu-Daudé]

On 29/6/23 10:12, Michael Tokarev wrote:
> 29.06.2023 11:02, Thomas Huth wrote:
>> There is no package called "qemu" here - thus use the two meta-packages
>> "qemu-system" and "qemu-user" instead.
> 
> There are 2 questions here.
> 
> 1. Do we really want to suggest users to install the whole thing?
> qemu-user and qemu-system are two entirely different beasts, used
> for entirely different purposes.  This is exactly the reason why
> I dropped `qemu' package from debian/ubuntu, - because effectively
> there are two independent, entirely different packages.
> 
> Also 1.a, - again, whole qemu-system usually isn't needed. There are
> another 2 big different classes here, - native thing (probably with
> kvm), and foreign thing.
> 
>> Resolves: https://gitlab.com/qemu-project/qemu-web/-/issues/8
> ..> -* <strong>Debian/Ubuntu:</strong> `apt-get install qemu`
>> +* <strong>Debian/Ubuntu:</strong> `apt-get install qemu-system 
>> qemu-user`
> 
> 2.  There are 2 qemu-user packages on debian/ubuntu: it is qemu-user
> and qemu-user-static. My guess is that most users actually need the latter,
> at least this one lets to run foreign chroots without copying anything from
> host system to a chroot.  In rare cases when one wants to install and run
> foreign binaries directly into the host system, qemu-user is okay. But it
> is a really rare case, and usually combined with running foreign chroots
> anyway.
> 
> So I'd say this whole thing needs a bit more explanation, like,
> 
>   when you want to run qemu-system emulation, install qemu-system 
> (meta)package.
>   when you want user-mode emulation, install qemu-user-static package.
> 
> Or something like this.

Or link to the Debian wiki where the qemu packages are explained :)

> This is actually a question to QEMU upstream, - I think the same reasoning
> applies there as well.
> 
> Thanks,
> 
> /mjt
> 
> 

Re: [qemu-web PATCH] Fix installation instructions for Debian/Ubuntu

[Thomas Huth]

On 29/06/2023 10.12, Michael Tokarev wrote:
> 29.06.2023 11:02, Thomas Huth wrote:
>> There is no package called "qemu" here - thus use the two meta-packages
>> "qemu-system" and "qemu-user" instead.
> 
> There are 2 questions here.
> 
> 1. Do we really want to suggest users to install the whole thing?
> qemu-user and qemu-system are two entirely different beasts, used
> for entirely different purposes.  This is exactly the reason why
> I dropped `qemu' package from debian/ubuntu, - because effectively
> there are two independent, entirely different packages.
> 
> Also 1.a, - again, whole qemu-system usually isn't needed. There are
> another 2 big different classes here, - native thing (probably with
> kvm), and foreign thing.
> 
>> Resolves: https://gitlab.com/qemu-project/qemu-web/-/issues/8
> ..> -* <strong>Debian/Ubuntu:</strong> `apt-get install qemu`
>> +* <strong>Debian/Ubuntu:</strong> `apt-get install qemu-system qemu-user`
> 
> 2.  There are 2 qemu-user packages on debian/ubuntu: it is qemu-user
> and qemu-user-static. My guess is that most users actually need the latter,
> at least this one lets to run foreign chroots without copying anything from
> host system to a chroot.  In rare cases when one wants to install and run
> foreign binaries directly into the host system, qemu-user is okay. But it
> is a really rare case, and usually combined with running foreign chroots
> anyway.
> 
> So I'd say this whole thing needs a bit more explanation, like,
> 
>   when you want to run qemu-system emulation, install qemu-system 
> (meta)package.
>   when you want user-mode emulation, install qemu-user-static package.

Ok, thanks, makes sense, I sent a v2 where I've split it.

> This is actually a question to QEMU upstream, - I think the same reasoning
> applies there as well.

Looking at our docs, it seems like we're lacking an introduction to the the 
"configure" switches like --enable-system and --enable-user completely, 
indeed :-(

  Thomas

Re: [qemu-web PATCH] Fix installation instructions for Debian/Ubuntu

[Michael Tokarev]

29.06.2023 12:31, Thomas Huth wrote:
..
>> This is actually a question to QEMU upstream, - I think the same reasoning
>> applies there as well.
> 
> Looking at our docs, it seems like we're lacking an introduction to the the "configure" switches like --enable-system and --enable-user completely, 
> indeed :-(

When I come to qemu 10+ years ago, it was somehow very
difficult to understand what's qemu-user and what's
qemu-system.  Now it is obvious, like breathing, but
that's after 10+ years.. ;))

/mjt