GNU logs - #37035, boring messages

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Subject: bug#37035: --with-graft tries to download source files and build them
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When running `guix build --dry-run --with-graft=3Dmesa=3Dmesa love`, Guix s=
hows that it will try to download a bunch of source files for quite a few p=
ackages:

```
$ guix build --dry-run --with-graft=3Dmesa=3Dmesa love
The following derivations would be built:
   /gnu/store/0lfws1b85h6lkv09pp7q0439pd41qirj-love-11.1.drv
   /gnu/store/2spqmdn4s13r0z9d9hym25h4nfcl1r5g-sdl2-2.0.9.drv
   /gnu/store/aknpb0pgslx9jaidgvh8wrzl7j6nl3nn-fcitx-4.2.9.6.drv
   /gnu/store/8pk7gncsr1cfph8km8dhwk67q9d58c0k-libepoxy-1.5.3.drv
   /gnu/store/w0wxk5f2a44hksrbvwqxn1d6sx96hdyw-gtk+-3.24.9.drv
   /gnu/store/ydx7mg4bni0lfckw0r3x65icmfhr194k-xorg-server-1.20.5.drv
   /gnu/store/xnc6a1fjwlwfjpg0lwai3aq51rw5qwrc-extra-cmake-modules-5.55.0.d=
rv
   /gnu/store/jp29lhdwhs3znbsbznxq9nd9zp5l8ds0-qtbase-5.11.3.drv
   /gnu/store/sblg1v3yxf41b89aaj4r47zcyhxs3az4-ibus-1.5.20.drv
   /gnu/store/a4ynsy7ras28jlgmrhfilkc0lnin21mw-libnotify-0.7.7.drv
   /gnu/store/d8gvjnrl584wc5pavppa3m3yvm3jaxpk-dconf-0.32.0.drv
76.4 MB would be downloaded:
   /gnu/store/4vl3vkvqv0hhr0rlzciq55l4j8c5lgdz-ibus-1.5.20.tar.gz
   /gnu/store/jpxqw86l1gxkfrp66h5mc747xf881hjm-gettext-0.19.8.1
   /gnu/store/9dgbqa3m412prwadpwg0ah7a3kv6fh9p-libnotify-0.7.7.tar.xz
   /gnu/store/aaha1wfv58b83fwp0fqg8b5nlpkw1bva-libmng-2.0.3
   /gnu/store/6qy0ni5msmg93a55wi5qmj96729c1fcf-vulkan-headers-1.1.112
   /gnu/store/3a3j7rnd49fr6papzd2r2i8f96ayxi1v-qtbase-everywhere-src-5.11.3=
.tar.xz
   /gnu/store/3n7yhbfl1gik3n64rmy1574djpc1w6m5-gperf-3.1
   /gnu/store/wkfsm7mv8rjawdkzi8chf7qy8l5dppkm-xorg-server-1.20.5.tar.xz
   /gnu/store/7w7fq1iy0jkap5np4q00cw4cllr0lkj5-libdmx-1.1.4
   /gnu/store/cc39n3mx1nswgwx7p8mbx7apy4j1w8yy-xtrans-1.3.5
   /gnu/store/l1nxv1asf958h9ww4iijypyk31mj3d3x-gtk+-3.24.9.tar.xz
   /gnu/store/9rzjddyd621n26av5hb6zn55r372fhnv-libepoxy-1.5.3.tar.xz
```=

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: <pkill9@HIDDEN>
Subject: bug#37035: Acknowledgement (--with-graft tries to download source
 files and build them)
Message-ID: <handler.37035.B.156586909713674.ack <at> debbugs.gnu.org>
References: <E1hyE53-0000Fu-Hv@HIDDEN>
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Date: Thu, 15 Aug 2019 11:39:02 +0000

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37035: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D37035
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Subject: bug#37035: --with-graft tries to download source files and build them
Resent-From: Mark H Weaver <mhw@HIDDEN>
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Date: Thu, 15 Aug 2019 15:20:58 -0400
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 of "Thu, 15 Aug 2019 12:38:09 +0100 (BST)")
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Hi,

<pkill9@HIDDEN> writes:

> When running `guix build --dry-run --with-graft=mesa=mesa love`, Guix shows that it will try to download a bunch of source files for quite a few packages:
>
> ```
> $ guix build --dry-run --with-graft=mesa=mesa love
> The following derivations would be built:
>    /gnu/store/0lfws1b85h6lkv09pp7q0439pd41qirj-love-11.1.drv
>    /gnu/store/2spqmdn4s13r0z9d9hym25h4nfcl1r5g-sdl2-2.0.9.drv
>    /gnu/store/aknpb0pgslx9jaidgvh8wrzl7j6nl3nn-fcitx-4.2.9.6.drv
>    /gnu/store/8pk7gncsr1cfph8km8dhwk67q9d58c0k-libepoxy-1.5.3.drv
>    /gnu/store/w0wxk5f2a44hksrbvwqxn1d6sx96hdyw-gtk+-3.24.9.drv
>    /gnu/store/ydx7mg4bni0lfckw0r3x65icmfhr194k-xorg-server-1.20.5.drv
>    /gnu/store/xnc6a1fjwlwfjpg0lwai3aq51rw5qwrc-extra-cmake-modules-5.55.0.drv
>    /gnu/store/jp29lhdwhs3znbsbznxq9nd9zp5l8ds0-qtbase-5.11.3.drv
>    /gnu/store/sblg1v3yxf41b89aaj4r47zcyhxs3az4-ibus-1.5.20.drv
>    /gnu/store/a4ynsy7ras28jlgmrhfilkc0lnin21mw-libnotify-0.7.7.drv
>    /gnu/store/d8gvjnrl584wc5pavppa3m3yvm3jaxpk-dconf-0.32.0.drv
> 76.4 MB would be downloaded:
>    /gnu/store/4vl3vkvqv0hhr0rlzciq55l4j8c5lgdz-ibus-1.5.20.tar.gz
>    /gnu/store/jpxqw86l1gxkfrp66h5mc747xf881hjm-gettext-0.19.8.1
>    /gnu/store/9dgbqa3m412prwadpwg0ah7a3kv6fh9p-libnotify-0.7.7.tar.xz
>    /gnu/store/aaha1wfv58b83fwp0fqg8b5nlpkw1bva-libmng-2.0.3
>    /gnu/store/6qy0ni5msmg93a55wi5qmj96729c1fcf-vulkan-headers-1.1.112
>    /gnu/store/3a3j7rnd49fr6papzd2r2i8f96ayxi1v-qtbase-everywhere-src-5.11.3.tar.xz
>    /gnu/store/3n7yhbfl1gik3n64rmy1574djpc1w6m5-gperf-3.1
>    /gnu/store/wkfsm7mv8rjawdkzi8chf7qy8l5dppkm-xorg-server-1.20.5.tar.xz
>    /gnu/store/7w7fq1iy0jkap5np4q00cw4cllr0lkj5-libdmx-1.1.4
>    /gnu/store/cc39n3mx1nswgwx7p8mbx7apy4j1w8yy-xtrans-1.3.5
>    /gnu/store/l1nxv1asf958h9ww4iijypyk31mj3d3x-gtk+-3.24.9.tar.xz
>    /gnu/store/9rzjddyd621n26av5hb6zn55r372fhnv-libepoxy-1.5.3.tar.xz
> ```

You asked Guix to build something, so it's not surprising to me that it
might need to download some source code to do that.

Can you spell out more clearly what you expected to happen differently,
and why you think Guix is acting improperly here?

     Thanks,
       Mark

Message sent to bug-guix@HIDDEN:

Subject: bug#37035: --with-graft tries to download source files and build them
References: <E1hyE53-0000Fu-Hv@HIDDEN>
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Hi,

> You asked Guix to build something, so it's not surprising to me that it
> might need to download some source code to do that.
>=20
> Can you spell out more clearly what you expected to happen differently,
> and why you think Guix is acting improperly here?
>=20
>      Thanks,
>        Mark

Originally I expected it to attempt to graft mesa onto the love package, ev=
en though it's the exact same input, however after running `guix build --dr=
y-run --with-graft=3Dsubversion=3Dsubversion git` I see that it shouldn't o=
utput anything (same as running `guix build` with a package you already hav=
e all substitutes for).

If I run `guix build --dry-run love` it shows that it will just download th=
e substitute for "love", not build anything else from source, so grafting m=
esa onto it (even though it's the same input) shouldn't try to build anythi=
ng from source.

Also just to note, in this example grafting "mesa" onto itself is just as a=
n example, not for a useful reason. An example that doesn't try to build an=
ything is running `guix build --dry-run --with-graft=3Dsubversion=3Dsubvers=
ion git`.

As an example of a graft that works, if you put this in a file and build it=
 with `guix build -f <file>`, it will successfully graft the "hello" packag=
e (with the name and version changed) onto the "git" package:

```
(use-modules (guix packages) (gnu packages base) (gnu packages version-cont=
rol))

(define new-subversion
  (package (inherit hello)
           (name "subversion")
           (version (package-version subversion))))

(define new-subversion-graft
  (package (inherit subversion)
           (replacement new-subversion)))

(define with-new-subversion
  (package-input-rewriting
    `((,subversion . ,new-subversion-graft))))

(with-new-subversion git)
```

You can see that it worked by running `/gnu/store/...-git-2.22.0-svn/libexe=
c/git-core/git-svn`, and it will fail with a bunch of errors, unlike the un=
grafted package.=

Last modified: Mon, 25 Nov 2019 12:00:02 UTC

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