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PROBLEM
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$NVIM_LISTEN_ADDRESS has conflicting purposes as both a parameter ("the
current process should listen on this address") and a descriptor ("the
current process is a child of this address").
This contradiction means the presence of NVIM_LISTEN_ADDRESS is
ambiguous, so child Nvim always tries to listen on its _parent's_
socket. This is the cause of lots of "Failed to start server" spam in
our test/CI logs:
WARN 2022-04-30… server_start:154: Failed to start server: address already in use: \\.\pipe\nvim-4480-0
WARN 2022-04-30… server_start:154: Failed to start server: address already in use: \\.\pipe\nvim-2168-0
SOLUTION
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1. Set $NVIM to the parent v:servername, *only* in child processes.
- Now the correct way to detect a "parent" Nvim is to check for $NVIM.
2. Do NOT set $NVIM_LISTEN_ADDRESS in child processes.
3. On startup if $NVIM_LISTEN_ADDRESS exists, unset it immediately after
server init.
4. Open a channel to parent automatically, expose it as v:parent.
Fixes #3118
Fixes #6764
Fixes #9336
Ref https://github.com/neovim/neovim/pull/8247#issuecomment-380275696
Ref #8696
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| .. | ||
| api_functions_spec.lua | ||
| buf_functions_spec.lua | ||
| changedtick_spec.lua | ||
| container_functions_spec.lua | ||
| ctx_functions_spec.lua | ||
| environ_spec.lua | ||
| errorlist_spec.lua | ||
| eval_spec.lua | ||
| executable_spec.lua | ||
| execute_spec.lua | ||
| exepath_spec.lua | ||
| fnamemodify_spec.lua | ||
| functions_spec.lua | ||
| getline_spec.lua | ||
| glob_spec.lua | ||
| has_spec.lua | ||
| hostname_spec.lua | ||
| input_spec.lua | ||
| json_functions_spec.lua | ||
| lang_spec.lua | ||
| let_spec.lua | ||
| map_functions_spec.lua | ||
| match_functions_spec.lua | ||
| minmax_functions_spec.lua | ||
| modeline_spec.lua | ||
| msgpack_functions_spec.lua | ||
| null_spec.lua | ||
| operators_spec.lua | ||
| printf_spec.lua | ||
| reltime_spec.lua | ||
| screenpos_spec.lua | ||
| server_spec.lua | ||
| setpos_spec.lua | ||
| sort_spec.lua | ||
| special_vars_spec.lua | ||
| string_spec.lua | ||
| system_spec.lua | ||
| timer_spec.lua | ||
| uniq_spec.lua | ||
| vvar_event_spec.lua | ||
| wait_spec.lua | ||
| writefile_spec.lua | ||