[Bug 2139436] Re: cargo fetch fails with "invalid version 0 on git_proxy_options" error

[Brent Kerby]

I created an autopkgtest to ensure this bug does not occur in future
releases or backports:
https://code.launchpad.net/~blkerby/ubuntu/+source/rustc/+git/rustc/+merge/499670.
The issue indeed appears to be an incompatibility between the system
libgit2 version and cargo. The solution will likely be to build the
toolchain using the vendored version of libgit2 rather than relying on
the system version.

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https://bugs.launchpad.net/bugs/2139436

Title:
  cargo fetch fails with "invalid version 0 on git_proxy_options" error

Status in rustc-1.85 package in Ubuntu:
  Confirmed
Status in rustc-1.89 package in Ubuntu:
  New
Status in rustc-1.85 source package in Jammy:
  New
Status in rustc-1.89 source package in Jammy:
  New
Status in rustc-1.85 source package in Noble:
  New
Status in rustc-1.89 source package in Noble:
  New

Bug description:
  Hello!

  I actually tried rustc-1.85, 1.89, 1.84, 1.83, and all of them fail.
  Looks like only 1.82 version (cargo-1.82) works and < 1.82 including
  default 1.75.

  Checked both Ubuntu 22.04 and 24.04. Both are the same.

  The problem happens when git-ssh dependencies are used. Looks like
  this may be related to incompatibility of cargo and libgit versions.

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