[Caml-list] How do I get opam to show me why two packages conflict?

[Caml-list] How do I get opam to show me why two packages conflict?

[Martin DeMello]

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I tried to install drom via opam and got told that it conflicted with
core_kernel:

  ⊘ remove  core_kernel      v0.14.1        [conflicts with
opam-file-format]
  ↗ upgrade opam-file-format 2.1.0 to 2.1.1 [required by drom_lib]

but `opam show core_kernel` lists no dependency on opam-file-format`, and
`opam show opam-file-format.2.1.1` just says

  depends:      "ocaml" "dune" {>= "2.0"} "alcotest" {with-test}
  conflicts:    "core_kernel"

with no indication as to why the conflict.

martin

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Re: [Caml-list] How do I get opam to show me why two packages conflict?

[Fabrice Le Fessant]

Hi Martin,

  I have a 4.09.1 switch with both core_kernel.v0.14.1 and drom.0.2.0
installed with no conflict. Did you try to install with dev-deps ?

Best regards
--
Fabrice

On Sun, Dec 6, 2020 at 4:06 AM Martin DeMello <martindemello@gmail.com> wrote:
>
> I tried to install drom via opam and got told that it conflicted with core_kernel:
>
>   ⊘ remove  core_kernel      v0.14.1        [conflicts with opam-file-format]
>   ↗ upgrade opam-file-format 2.1.0 to 2.1.1 [required by drom_lib]
>
> but `opam show core_kernel` lists no dependency on opam-file-format`, and `opam show opam-file-format.2.1.1` just says
>
>   depends:      "ocaml" "dune" {>= "2.0"} "alcotest" {with-test}
>   conflicts:    "core_kernel"
>
> with no indication as to why the conflict.
>
> martin

Re: [Caml-list] How do I get opam to show me why two packages conflict?

[Fabrice Le Fessant]

Then, I don't understand the fix in the opam-repository:
opam-file-format does conflict with core_kernel when they are included
in the same executable, but not when they are just in the same switch.
Conflicts in the opam-repository are for installation conflicts, not
for linking conflicts, no ?

On Sun, Dec 6, 2020 at 1:19 PM David Allsopp <david@allsopps.net> wrote:
>
> opam-file-format 2.1.1 conflicts core-kernel because of https://github.com/ocaml/opam-file-format/pull/34. 2.1.2 (which should be being released soon along with opam 2.1 beta4) will include that fix.
>
> It's not perhaps the greatest UI for it, but the reasons for such changes can occasionally be clear from the git blame on opam-repository: https://github.com/ocaml/opam-repository/blame/master/packages/opam-file-format/opam-file-format.2.1.1/opam#L13
>
> The change in opam-repository was only merged yesterday.
>
> All best,
>
>
> David
>
> > -----Original Message-----
> > From: caml-list-request@inria.fr <caml-list-request@inria.fr> On Behalf Of
> > Fabrice Le Fessant
> > Sent: 06 December 2020 09:41
> > To: Martin DeMello <martindemello@gmail.com>
> > Cc: caml users <caml-list@inria.fr>
> > Subject: Re: [Caml-list] How do I get opam to show me why two packages
> > conflict?
> >
> > Hi Martin,
> >
> >   I have a 4.09.1 switch with both core_kernel.v0.14.1 and drom.0.2.0
> > installed with no conflict. Did you try to install with dev-deps ?
> >
> > Best regards
> > --
> > Fabrice
> >
> > On Sun, Dec 6, 2020 at 4:06 AM Martin DeMello <martindemello@gmail.com>
> > wrote:
> > >
> > > I tried to install drom via opam and got told that it conflicted with
> > core_kernel:
> > >
> > >   ⊘ remove  core_kernel      v0.14.1        [conflicts with opam-file-
> > format]
> > >   ↗ upgrade opam-file-format 2.1.0 to 2.1.1 [required by drom_lib]
> > >
> > > but `opam show core_kernel` lists no dependency on opam-file-format`,
> > > and `opam show opam-file-format.2.1.1` just says
> > >
> > >   depends:      "ocaml" "dune" {>= "2.0"} "alcotest" {with-test}
> > >   conflicts:    "core_kernel"
> > >
> > > with no indication as to why the conflict.
> > >
> > > martin

Re: [Caml-list] How do I get opam to show me why two packages conflict?

[Martin DeMello]

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I tried on both 4.09 and 4.11 and couldn't get it to work. Also I couldn't
find a `--dev-deps` flag, did you mean `--deps-only'? That didn't work
either. I'll wait for the fix David Allsopp mentioned and try again.

martin

On Sun, Dec 6, 2020 at 1:41 AM Fabrice Le Fessant <
fabrice.le_fessant@origin-labs.com> wrote:

> Hi Martin,
>
>   I have a 4.09.1 switch with both core_kernel.v0.14.1 and drom.0.2.0
> installed with no conflict. Did you try to install with dev-deps ?
>
> Best regards
> --
> Fabrice
>
> On Sun, Dec 6, 2020 at 4:06 AM Martin DeMello <martindemello@gmail.com>
> wrote:
> >
> > I tried to install drom via opam and got told that it conflicted with
> core_kernel:
> >
> >   ⊘ remove  core_kernel      v0.14.1        [conflicts with
> opam-file-format]
> >   ↗ upgrade opam-file-format 2.1.0 to 2.1.1 [required by drom_lib]
> >
> > but `opam show core_kernel` lists no dependency on opam-file-format`,
> and `opam show opam-file-format.2.1.1` just says
> >
> >   depends:      "ocaml" "dune" {>= "2.0"} "alcotest" {with-test}
> >   conflicts:    "core_kernel"
> >
> > with no indication as to why the conflict.
> >
> > martin
>

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Re: [Caml-list] How do I get opam to show me why two packages conflict?

[Fabrice Le Fessant]

I have submitted `ez_opam_file` to opam-repository, a compatibility
library for opam-file-format supporting all of its versions. Once it's
accepted, I will submit the corresponding versions of `drom` and
`opam-bin`, so they should be installable in any switch.
--
Fabrice

On Mon, Dec 7, 2020 at 4:28 AM Martin DeMello <martindemello@gmail.com> wrote:
>
> I tried on both 4.09 and 4.11 and couldn't get it to work. Also I couldn't find a `--dev-deps` flag, did you mean `--deps-only'? That didn't work either. I'll wait for the fix David Allsopp mentioned and try again.
>
> martin
>
> On Sun, Dec 6, 2020 at 1:41 AM Fabrice Le Fessant <fabrice.le_fessant@origin-labs.com> wrote:
>>
>> Hi Martin,
>>
>>   I have a 4.09.1 switch with both core_kernel.v0.14.1 and drom.0.2.0
>> installed with no conflict. Did you try to install with dev-deps ?
>>
>> Best regards
>> --
>> Fabrice
>>
>> On Sun, Dec 6, 2020 at 4:06 AM Martin DeMello <martindemello@gmail.com> wrote:
>> >
>> > I tried to install drom via opam and got told that it conflicted with core_kernel:
>> >
>> >   ⊘ remove  core_kernel      v0.14.1        [conflicts with opam-file-format]
>> >   ↗ upgrade opam-file-format 2.1.0 to 2.1.1 [required by drom_lib]
>> >
>> > but `opam show core_kernel` lists no dependency on opam-file-format`, and `opam show opam-file-format.2.1.1` just says
>> >
>> >   depends:      "ocaml" "dune" {>= "2.0"} "alcotest" {with-test}
>> >   conflicts:    "core_kernel"
>> >
>> > with no indication as to why the conflict.
>> >
>> > martin