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Fix using git deps with rev= in pyproject.toml #358

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bjornfor
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Currently poetry2nix calls builtins.fetchGit with ref=<rev>, which Nix
translates to ref=refs/heads/<rev> and breaks (git):

$ nix-build
+ /usr/bin/git -C /home/bf/.cache/nix/gitv3/1aba8psc37ekc9ph2m5ziidm644mj84yrrj7g6x8amy3g13kyjm4 cat-file -e 4d41bada407267a008473547085f8242bb8663e5
+ /usr/bin/git -C
/home/bf/.cache/nix/gitv3/1aba8psc37ekc9ph2m5ziidm644mj84yrrj7g6x8amy3g13kyjm4 fetch --quiet --force -- ssh://[email protected]/repo.git refs/heads/4d41bada407267a008473547085f8242bb8663e5:refs/heads/4d41bada407267a008473547085f8242bb8663e5
fatal: Couldn't find remote ref refs/heads/4d41bada407267a008473547085f8242bb8663e5
error: program 'git' failed with exit code 128
(use '--show-trace' to show detailed location information)
fatal: the remote end hung up unexpectedly

(I wrote a git wrapper that traces the calls to the real git.)

Unfortunately, poetry does not support specifying both branch= and rev=
in pyproject.toml (it ignores branch= if rev= is set), so we have to fix
this in poetry2nix. (At least for now.)

Fix it by using the new builtins.fetchGit 'allRefs' parameter when rev=
is set. This parameter is only available in nixUnstable, but as the
current code is broken anyway, I think that's ok.

Currently poetry2nix calls builtins.fetchGit with ref=<rev>, which Nix
translates to ref=refs/heads/<rev> and breaks (git):

$ nix-build
+ /usr/bin/git -C /home/bf/.cache/nix/gitv3/1aba8psc37ekc9ph2m5ziidm644mj84yrrj7g6x8amy3g13kyjm4 cat-file -e 4d41bada407267a008473547085f8242bb8663e5
+ /usr/bin/git -C
/home/bf/.cache/nix/gitv3/1aba8psc37ekc9ph2m5ziidm644mj84yrrj7g6x8amy3g13kyjm4 fetch --quiet --force -- ssh://[email protected]/repo.git refs/heads/4d41bada407267a008473547085f8242bb8663e5:refs/heads/4d41bada407267a008473547085f8242bb8663e5
fatal: Couldn't find remote ref refs/heads/4d41bada407267a008473547085f8242bb8663e5
error: program 'git' failed with exit code 128
(use '--show-trace' to show detailed location information)
fatal: the remote end hung up unexpectedly

(I wrote a git wrapper that traces the calls to the real git.)

Unfortunately, poetry does not support specifying both branch= and rev=
in pyproject.toml (it ignores branch= if rev= is set), so we have to fix
this in poetry2nix. (At least for now.)

Fix it by using the new builtins.fetchGit 'allRefs' parameter when rev=
is set. This parameter is only available in nixUnstable, but as the
current code is broken anyway, I think that's ok.
@bjornfor
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Ping?

@bjornfor
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bjornfor commented Sep 7, 2021

@adisbladis: Can you please have a look?

@bjornfor
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Looks like nix 2.3 and 2.4 handles this differently: NixOS/nix#5128

@adisbladis
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Since it seems that this PR relies on a bug in the unreleased Nix 2.4 I'm inclined to close it.

@adisbladis adisbladis closed this Sep 23, 2021
vlaci pushed a commit to vlaci/poetry2nix that referenced this pull request Oct 20, 2021
Another approach to make `poetry2nix` work with dependencies specified
by arbitrary `rev=<hash>` values on newer Nix revisions.

Relates-to: nix-community#358
Relates-to: NixOS/nix#5128
vlaci pushed a commit to vlaci/poetry2nix that referenced this pull request Oct 20, 2021
Another approach to make `poetry2nix` work with dependencies specified
by arbitrary `rev=<hash>` values on newer Nix revisions.

Relates-to: nix-community#358
Relates-to: NixOS/nix#5128
vlaci pushed a commit to vlaci/poetry2nix that referenced this pull request Oct 20, 2021
Another approach to make `poetry2nix` work with dependencies specified
by arbitrary `rev=<hash>` values on newer Nix revisions.

Relates-to: nix-community#358
Relates-to: NixOS/nix#5128
vlaci pushed a commit to vlaci/poetry2nix that referenced this pull request Oct 22, 2021
Another approach to make `poetry2nix` work with dependencies specified
by arbitrary `rev=<hash>` values on newer Nix revisions.

Relates-to: nix-community#358
Relates-to: NixOS/nix#5128
adisbladis pushed a commit that referenced this pull request Jan 17, 2022
Another approach to make `poetry2nix` work with dependencies specified
by arbitrary `rev=<hash>` values on newer Nix revisions.

Relates-to: #358
Relates-to: NixOS/nix#5128
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2 participants