cargo fails to download git repo on powerpc

[hpckurt]

Trying to build rattler-build on powerpc: https://github.com/prefix-dev/rattler-build

If it was working correctly, cargo update would automatically download and update the local git dependencies. However, instead it results in the following error:

$ RUST_BACKTRACE=1 cargo update
    Updating git repository `https://github.com/wolfv/zip2`
error: failed to load source for dependency `zip`

Caused by:
  Unable to update https://github.com/wolfv/zip2?branch=patched

Caused by:
  object not found - no match for id (8fcb25229346479487823cbe0f9326d74c666d13); class=Odb (9); code=NotFound (-3)

You can git clone the repository with that specific commit ID perfectly fine outside of cargo.

Meta

rustc --version --verbose:

rustc 1.83.0 (90b35a623 2024-11-26)
binary: rustc
commit-hash: 90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf
commit-date: 2024-11-26
host: powerpc-unknown-linux-gnu
release: 1.83.0
LLVM version: 19.1.1

Backtrace from cargo build:

RUST_BACKTRACE=1 cargo build
    Updating git repository `https://github.com/wolfv/zip2`
remote: Enumerating objects: 55146, done.
remote: Counting objects: 100% (3043/3043), done.
remote: Compressing objects: 100% (169/169), done.
remote: Total 55146 (delta 2971), reused 2874 (delta 2874), pack-reused 52103 (from 2)
Receiving objects: 100% (55146/55146), 50.42 MiB | 6.99 MiB/s, done.
Resolving deltas: 100% (8637/8637), done.
From https://github.com/wolfv/zip2
 * [new ref]           8fcb25229346479487823cbe0f9326d74c666d13 -> refs/commit/8fcb25229346479487823cbe0f9326d74c666d13
error: failed to load source for dependency `zip`

Caused by:
  Unable to update https://github.com/wolfv/zip2?branch=patched#8fcb2522

Caused by:
  revspec '8fcb25229346479487823cbe0f9326d74c666d13' not found; class=Reference (4); code=NotFound (-3)

[epage]

I wasn't able to reproduce it on My x64 Linux system.

Can you try running CARGO_NET_GIT_FETCH_WITH_CLI=true cargo update? Unsure at what step the failure is happening if that will affect it but my hope is this can give us insight into what might be happening.

[hpckurt]

Same exact error:

CARGO_NET_GIT_FETCH_WITH_CLI=true cargo update
    Updating git repository `https://github.com/wolfv/zip2`
error: failed to load source for dependency `zip`

Caused by:
  Unable to update https://github.com/wolfv/zip2?branch=patched

Caused by:
  object not found - no match for id (8fcb25229346479487823cbe0f9326d74c666d13); class=Odb (9); code=NotFound (-3)

I can also verify that the issue doesn't occur on x64 or arm64 (linux). Could it be a 32bit platform issue?

[ehuss]

Can you say how I can set up an emulated environment for powerpc-unknown-linux-gnu? Is there an image I can somehow run?

[hpckurt]

@ehuss You can always create a powerpc chroot using qemu-user-static and debootstrap

[ehuss]

Sorry, I don't know what those words mean. Can you give me the exact commands to run in a typical Ubuntu environment to give me a shell inside a powerpc environment?

[hpckurt]

Sorry, I don't know what those words mean. Can you give me the exact commands to run in a typical Ubuntu environment to give me a shell inside a powerpc environment?

Here are instructions to get a qemu rootfs chroot working (Assuming you're already root)

1. apt update
2. apt install qemu-user-static binfmt-support debootstrap debian-ports-archive-keyring 
3. gpg --keyserver keyring.debian.org --recv-keys 8D69674688B6CB36
4. mkdir debianpowerpc
5. debootstrap --arch=powerpc --keyring=/etc/apt/trusted.gpg.d/debian-ports-archive-2024.gpg  --foreign sid debianpowerpc/ http://ftp.ports.debian.org/debian-ports
6. cd debianpowerpc/
7. mount -o bind /dev dev/
8. mount -t devpts pts dev/pts/
9. mount -t sysfs sys sys/
10. mount -t proc proc proc/
11. cd ..
12. chroot debianpowerpc/
13. Install rust using rustup in chroot