[Bug 1841191] Re: "error: failed to acquire package cache lock" in sbuild

[Olivier Tilloy]

** Patch added: "debdiff for disco"
   https://bugs.launchpad.net/ubuntu/+source/cargo/+bug/1841191/+attachment/5309516/+files/cargo-disco.debdiff

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https://bugs.launchpad.net/bugs/1841191

Title:
  "error: failed to acquire package cache lock" in sbuild

Status in cargo package in Ubuntu:
  Fix Released
Status in cargo source package in Xenial:
  In Progress
Status in cargo source package in Bionic:
  Fix Committed
Status in cargo source package in Disco:
  In Progress

Bug description:
  [Impact]

  All packages using cargo (rust's package manager) to build in Launchpad will FTBFS because cargo tries to acquire a lock on $HOME/.cargo, but $HOME is set to /sbuild-nonexistent in sbuild.
  This includes the thunderbird 60.9.1+build1 SRU tracked by bug #1850651.

  
  [Test Case]

  In a xenial/disco virtual machine:

    sudo apt install cargo
    cd `mktemp -d`
    export HOME=/nonexistent
    cargo init --name foobar
    cargo build

  This should succeed. With the unpatched version currently in
  xenial/disco, it fails with "error: failed to acquire package cache
  lock".

  
  [Regression Potential]

  Low. This cherry-picks one single upstream commit that addresses only
  this bug.

  
  [Original Description]

  Upstream issue: https://github.com/rust-lang/cargo/issues/7147

  This breaks firefox and thunderbird builds in eoan:

      export CARGO_HOME=/<<BUILDDIR>>/thunderbird-68.0+build4/third_party/cbindgen/.cargo; \
      cargo install --path . --bin cbindgen --root ../../cbindgen
      error: failed to acquire package cache lock

      Caused by:
        failed to open: /sbuild-nonexistent/.cargo/.package-cache

      Caused by:
        Permission denied (os error 13)

  The following commit needs to be backported as a distro patch:
  https://github.com/rust-
  lang/cargo/commit/2b21fa68368f13b43f4c34886116df2e1b9d276e

  ProblemType: Bug
  DistroRelease: Ubuntu 19.10
  Package: cargo 0.37.0-3ubuntu1
  ProcVersionSignature: Ubuntu 5.0.0-25.26-generic 5.0.18
  Uname: Linux 5.0.0-25-generic x86_64
  ApportVersion: 2.20.11-0ubuntu7
  Architecture: amd64
  Date: Fri Aug 23 14:24:46 2019
  SourcePackage: cargo
  UpgradeStatus: No upgrade log present (probably fresh install)

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