[gentoo-dev] dosym function in binary package ebuilds

[gentoo-dev] dosym function in binary package ebuilds

[Fabulous Zhang Zheng]

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Good evening, dear list

Most binary package ebuilds have such a *dosym* statement in src_install(),
take net-im/signal-desktop-bin as an example:

dosym ../../opt/Signal/${MY_PN} /usr/bin/${MY_PN}     (where the variable
is signal-desktop)

*dosym* creates a symlink of the binary under opt at /usr/bin/ according to
devmanaul.

I'm confused about the "../../", since S="${workdir}",  the correct way
seems to be "dosym  ./opt/Signal/xxx    /usr/bin/xxx"

It's much appreciated if anyone could help   ; )


└── signal-desktop-bin-5.50.0
    ├── distdir
    │   └── signal-desktop_5.50.0_amd64.deb ->
/var/cache/distfiles/signal-desktop_5.50.0_amd64.deb
    ├── files -> /var/db/repos/gentoo/net-im/signal-desktop-bin/files
    ├── homedir
    ├── temp
    │   ├── build.log
    │   ├── eclass-debug.log
    │   ├── environment
    │   └── logging
    └── work
        ├── opt
        └── usr

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Re: [gentoo-dev] dosym function in binary package ebuilds

[Arsen Arsenović]

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Hi,

> I'm confused about the "../../", since S="${workdir}",  the correct
> way seems to be "dosym  ./opt/Signal/xxx    /usr/bin/xxx"

This is just how name resolution works on UNIX (see also: namei). If you 
start at /usr/bin/xxx, take it's parent (/usr/bin/), and then follow 
components of the link (../../opt/Signal/${MY_PN}) you get
/usr/bin/../../opt/Signal/${MY_PN}, collapsing those two parents 
(assuming they're also not links), you're left with /opt/Signal/${PN}. 
This is done so that these links act correct in roots (if one just did, 
e.g. /opt/Signal/${MY_PN}, and you were in a root, it'd refer to the 
hosts Signal install).

Hope that helps,
-- 
Arsen Arsenović

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Re: [gentoo-dev] dosym function in binary package ebuilds

[Alexey Zapparov]

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`dosym target link_name` creates a symlink. Under the hood it calls `ln`.
First argument may be either absolute path or relative to link_name.
Conventionally relative targets are used.

On Fri, 22 Jul 2022, 16:56 Fabulous Zhang Zheng, <zheng1181822466@gmail.com>
wrote:

> Good evening, dear list
>
> Most binary package ebuilds have such a *dosym* statement in
> src_install(), take net-im/signal-desktop-bin as an example:
>
> dosym ../../opt/Signal/${MY_PN} /usr/bin/${MY_PN}     (where the variable
> is signal-desktop)
>
> *dosym* creates a symlink of the binary under opt at /usr/bin/ according
> to devmanaul.
>
> I'm confused about the "../../", since S="${workdir}",  the correct way
> seems to be "dosym  ./opt/Signal/xxx    /usr/bin/xxx"
>
> It's much appreciated if anyone could help   ; )
>
>
> └── signal-desktop-bin-5.50.0
>     ├── distdir
>     │   └── signal-desktop_5.50.0_amd64.deb ->
> /var/cache/distfiles/signal-desktop_5.50.0_amd64.deb
>     ├── files -> /var/db/repos/gentoo/net-im/signal-desktop-bin/files
>     ├── homedir
>     ├── temp
>     │   ├── build.log
>     │   ├── eclass-debug.log
>     │   ├── environment
>     │   └── logging
>     └── work
>         ├── opt
>         └── usr
>
>

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Re: [gentoo-dev] dosym function in binary package ebuilds

[Fabulous Zhang Zheng]

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Dear Alexey,

thanks a lot for your reply, now I get it.

The path in 1st argument is relative to 2nd argument, and what I thought
before was that it's relative to S="${workdir}".

Best wishes



Alexey Zapparov <alexey@zapparov.com> 于2022年7月23日周六 04:50写道：

> `dosym target link_name` creates a symlink. Under the hood it calls `ln`.
> First argument may be either absolute path or relative to link_name.
> Conventionally relative targets are used.
>
> On Fri, 22 Jul 2022, 16:56 Fabulous Zhang Zheng, <
> zheng1181822466@gmail.com> wrote:
>
>> Good evening, dear list
>>
>> Most binary package ebuilds have such a *dosym* statement in
>> src_install(), take net-im/signal-desktop-bin as an example:
>>
>> dosym ../../opt/Signal/${MY_PN} /usr/bin/${MY_PN}     (where the variable
>> is signal-desktop)
>>
>> *dosym* creates a symlink of the binary under opt at /usr/bin/ according
>> to devmanaul.
>>
>> I'm confused about the "../../", since S="${workdir}",  the correct way
>> seems to be "dosym  ./opt/Signal/xxx    /usr/bin/xxx"
>>
>> It's much appreciated if anyone could help   ; )
>>
>>
>> └── signal-desktop-bin-5.50.0
>>     ├── distdir
>>     │   └── signal-desktop_5.50.0_amd64.deb ->
>> /var/cache/distfiles/signal-desktop_5.50.0_amd64.deb
>>     ├── files -> /var/db/repos/gentoo/net-im/signal-desktop-bin/files
>>     ├── homedir
>>     ├── temp
>>     │   ├── build.log
>>     │   ├── eclass-debug.log
>>     │   ├── environment
>>     │   └── logging
>>     └── work
>>         ├── opt
>>         └── usr
>>
>>

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