[Buildroot] [PATCH 1/1] docs/manual/prerequisite.txt: add diffutils

[José Luis Salvador Rufo]

Hello Thomas,

El mié, 27 abr 2022 a las 0:02, Thomas Petazzoni (<
thomas.petazzoni at bootlin.com>) escribió:

> Hello,
>
> On Tue, 26 Apr 2022 20:16:12 +0300
> Baruch Siach via buildroot <buildroot at buildroot.org> wrote:
>
> > Hi José,
> >
> > On Tue, Apr 26 2022, José Luis Salvador Rufo wrote:
> > > Patch title: docs/manual/prerequisite.txt: add diffutils
> >
> > No need for this line in the commit log body. The email subject line
> > appears as head line of the git commit once applied.
>
> Yep.
>
> > > The command `cmp` is used by `package/pkg-generic.mk` at commit
> > > 8623cc5deb5. This command is provided by `diffutils`.
> >
> > Actually, we have host-diffutils, so we can build cmp if the host does
> > not have it installed. All we need is support added under
> > support/dependencies/ like a few other utilities.
>
> Yes, but we're not going to build host-diffutils if cmp is missing.
> It's not done in our current implementation, and I don't think we want
> to do that. So it seems like diffutils is indeed a hard requirement.
>
> > We also don't list findutils as prerequisite, even though we rely
> > heavily on the 'find' utility.
>
> So perhaps we should list findutils as well in our hard requirements?
>

Seems fair, IMHO.


>
> José Luis: practically speaking, with which distribution have you been
> able to get a system without diffutils/findutils installed by default?


Docker official Archlinux image. On other hand `findutils` is installed by
default in this image.

```shell
❯ docker pull archlinux:latest
latest: Pulling from library/archlinux
b65db44913f6: Pull complete
beb98d5a80d3: Pull complete
Digest:
sha256:a9a59155d8cfd44d01432a1ef011dc015ff96e970adf787b632229fd637ea98c
Status: Downloaded newer image for archlinux:latest
docker.io/library/archlinux:latest

❯ docker run -it --rm archlinux:latest
[root at 354a655ce3f9 /]# pacman -Qi diffutils
warning: database file for 'core' does not exist (use '-Sy' to download)
warning: database file for 'extra' does not exist (use '-Sy' to download)
warning: database file for 'community' does not exist (use '-Sy' to
download)
error: package 'diffutils' was not found
[root at 354a655ce3f9 /]# pacman -Qi findutils
warning: database file for 'core' does not exist (use '-Sy' to download)
warning: database file for 'extra' does not exist (use '-Sy' to download)
warning: database file for 'community' does not exist (use '-Sy' to
download)
Name            : findutils
Version         : 4.9.0-1
Description     : GNU utilities to locate files
Architecture    : x86_64
URL             : https://www.gnu.org/software/findutils/
Licenses        : GPL3
Groups          : base-devel
Provides        : None
Depends On      : glibc  sh
Optional Deps   : None
Required By     : base  ca-certificates-utils
Optional For    : None
Conflicts With  : None
Replaces        : None
Installed Size  : 1416.31 KiB
Packager        : Tobias Powalowski <tpowa at archlinux.org>
Build Date      : Wed 02 Feb 2022 05:55:26 AM UTC
Install Date    : Sun 24 Apr 2022 12:04:13 AM UTC
Install Reason  : Installed as a dependency for another package
Install Script  : No
Validated By    : Signature
```

>
> Thanks,
>
> Thomas
> --
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com
>
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