[Sangho Lee (sangho2)]

This PR lets the kernel broker forward host AF_VSOCK connections to guest Unix sockets. Guests listen on abstract Unix socket names (unix://@litebox-vsock:*) corresponding to vsock ports. This avoids adding end-to-end vsock support to both the shim and broker.

[github-actions]

ℹ️ Note: This semver check was run against the sanghle/ulitebox/vsock_1_driver branch, not main or ulitebox.

🤖 SemverChecks 🤖 ⚠️ Potential breaking API changes detected ⚠️

Click for details

--- failure trait_method_added: pub trait method added ---

Description:
A non-sealed public trait added a new method without a default implementation, which breaks downstream implementations of the trait
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#trait-new-item-no-default
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/trait_method_added.ron

Failed in:
  trait method litebox_broker_core::fs::backend::Backend::rename_at in file /home/runner/work/litebox/litebox/litebox_broker_core/src/fs/backend.rs:226

--- failure enum_variant_added: enum variant added on exhaustive enum ---

Description:
A publicly-visible enum without #[non_exhaustive] has a new variant.
        ref: https://doc.rust-lang.org/cargo/reference/semver.html#enum-variant-new
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/enum_variant_added.ron

Failed in:
  variant FileRequest:Rename in /home/runner/work/litebox/litebox/litebox_broker_protocol/src/message.rs:834
  variant FileResponse:Rename in /home/runner/work/litebox/litebox/litebox_broker_protocol/src/message.rs:879

--- failure constructible_struct_adds_field: struct exhaustively constructible through public API adds field ---

Description:
A pub struct that could be exhaustively constructed with a literal using only public API has a new pub field, breaking existing exhaustive literals.
        ref: https://doc.rust-lang.org/reference/expressions/struct-expr.html
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/constructible_struct_adds_field.ron

Failed in:
  field Config.vsock in /home/runner/work/litebox/litebox/litebox_broker_vm_kernel/src/lib.rs:140

--- failure enum_no_repr_variant_discriminant_changed: enum variant had its discriminant change value ---

Description:
The enum's variant had its discriminant value change. This breaks downstream code that used its value via a numeric cast like `as isize`.
        ref: https://doc.rust-lang.org/reference/items/enumerations.html#assigning-discriminant-values
       impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.51.0/src/lints/enum_no_repr_variant_discriminant_changed.ron

Failed in:
  variant SyscallRequest::Newfstatat 75 -> 76 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3039
  variant SyscallRequest::Eventfd2 76 -> 77 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3045
  variant SyscallRequest::Pipe2 77 -> 78 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3049
  variant SyscallRequest::Clone 78 -> 79 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3053
  variant SyscallRequest::Clone3 79 -> 80 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3056
  variant SyscallRequest::SetThreadArea 80 -> 81 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3061
  variant SyscallRequest::ClockGettime 81 -> 82 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3064
  variant SyscallRequest::ClockGetres 82 -> 83 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3068
  variant SyscallRequest::ClockNanosleep 83 -> 84 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3072
  variant SyscallRequest::Gettimeofday 84 -> 85 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3078
  variant SyscallRequest::Time 85 -> 86 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3082
  variant SyscallRequest::Getrlimit 86 -> 87 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3085
  variant SyscallRequest::Setrlimit 87 -> 88 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3089
  variant SyscallRequest::Prlimit 88 -> 89 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3093
  variant SyscallRequest::SetTidAddress 89 -> 90 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3104
  variant SyscallRequest::Gettid 90 -> 91 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3107
  variant SyscallRequest::SetRobustList 91 -> 92 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3108
  variant SyscallRequest::GetRobustList 92 -> 93 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3111
  variant SyscallRequest::GetRandom 93 -> 94 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3116
  variant SyscallRequest::Getpid 94 -> 95 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3121
  variant SyscallRequest::Getppid 95 -> 96 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3122
  variant SyscallRequest::Setpgid 96 -> 97 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3123
  variant SyscallRequest::Getpgid 97 -> 98 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3127
  variant SyscallRequest::Getpgrp 98 -> 99 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3130
  variant SyscallRequest::Setsid 99 -> 100 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3131
  variant SyscallRequest::Getsid 100 -> 101 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3132
  variant SyscallRequest::Getuid 101 -> 102 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3135
  variant SyscallRequest::Geteuid 102 -> 103 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3136
  variant SyscallRequest::Getgid 103 -> 104 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3137
  variant SyscallRequest::Getegid 104 -> 105 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3138
  variant SyscallRequest::Sysinfo 105 -> 106 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3139
  variant SyscallRequest::CapGet 106 -> 107 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3142
  variant SyscallRequest::GetDirent64 107 -> 108 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3146
  variant SyscallRequest::SchedGetAffinity 108 -> 109 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3151
  variant SyscallRequest::SchedGetParam 109 -> 110 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3156
  variant SyscallRequest::SchedGetScheduler 110 -> 111 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3160
  variant SyscallRequest::SchedYield 111 -> 112 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3163
  variant SyscallRequest::Futex 112 -> 113 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3164
  variant SyscallRequest::Execve 113 -> 114 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3167
  variant SyscallRequest::Umask 114 -> 115 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3172
  variant SyscallRequest::Prctl 115 -> 116 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3175
  variant SyscallRequest::Alarm 116 -> 117 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3178
  variant SyscallRequest::Pause 117 -> 118 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3181
  variant SyscallRequest::RestartSyscall 118 -> 119 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3182
  variant SyscallRequest::SetITimer 119 -> 120 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3183
  variant SyscallRequest::GetITimer 120 -> 121 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3188
  variant SyscallRequest::Statx 121 -> 122 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3192
  variant SyscallRequest::TimerfdCreate 122 -> 123 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3199
  variant SyscallRequest::TimerfdSettime 123 -> 124 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3203
  variant SyscallRequest::TimerfdGettime 124 -> 125 in /home/runner/work/litebox/litebox/litebox_common_linux/src/lib.rs:3209