fix(health): do not run external processes in a shell

runtime/autoload/health/nvim.vim

@@ -148,14 +148,14 @@ endfunction
 
 function! s:get_tmux_option(option) abort
   let cmd = 'tmux show-option -qvg '.a:option  " try global scope
-  let out = system(cmd)
+  let out = system(split(cmd))
   let val = substitute(out, '\v(\s|\r|\n)', '', 'g')
   if v:shell_error
     call health#report_error('command failed: '.cmd."\n".out)
     return 'error'
   elseif empty(val)
     let cmd = 'tmux show-option -qvgs '.a:option  " try session scope
-    let out = system(cmd)
+    let out = system(split(cmd))
     let val = substitute(out, '\v(\s|\r|\n)', '', 'g')
     if v:shell_error
       call health#report_error('command failed: '.cmd."\n".out)
@@ -202,11 +202,11 @@ function! s:check_tmux() abort
   " check default-terminal and $TERM
   call health#report_info('$TERM: '.$TERM)
   let cmd = 'tmux show-option -qvg default-terminal'
-  let out = system(cmd)
+  let out = system(split(cmd))
   let tmux_default_term = substitute(out, '\v(\s|\r|\n)', '', 'g')
   if empty(tmux_default_term)
     let cmd = 'tmux show-option -qvgs default-terminal'
-    let out = system(cmd)
+    let out = system(split(cmd))
     let tmux_default_term = substitute(out, '\v(\s|\r|\n)', '', 'g')
   endif
 
@@ -225,7 +225,7 @@ function! s:check_tmux() abort
   endif
 
   " check for RGB capabilities
-  let info = system('tmux server-info')
+  let info = system(['tmux', 'server-info'])
   let has_tc = stridx(info, " Tc: (flag) true") != -1
   let has_rgb = stridx(info, " RGB: (flag) true") != -1
   if !has_tc && !has_rgb
@@ -242,7 +242,7 @@ function! s:check_terminal() abort
   endif
   call health#report_start('terminal')
   let cmd = 'infocmp -L'
-  let out = system(cmd)
+  let out = system(split(cmd))
   let kbs_entry   = matchstr(out, 'key_backspace=[^,[:space:]]*')
   let kdch1_entry = matchstr(out, 'key_dc=[^,[:space:]]*')
 

runtime/autoload/health/provider.vim

@@ -565,7 +565,7 @@ function! s:check_ruby() abort
           \ ['Install Ruby and verify that `ruby` and `gem` commands work.'])
     return
   endif
-  call health#report_info('Ruby: '. s:system('ruby -v'))
+  call health#report_info('Ruby: '. s:system(['ruby', '-v']))
 
   let [host, err] = provider#ruby#Detect()
   if empty(host)
@@ -588,11 +588,11 @@ function! s:check_ruby() abort
   endif
   let latest_gem = get(split(latest_gem, 'neovim (\|, \|)$' ), 0, 'not found')
 
-  let current_gem_cmd = host .' --version'
+  let current_gem_cmd = [host, '--version']
   let current_gem = s:system(current_gem_cmd)
   if s:shell_error
-    call health#report_error('Failed to run: '. current_gem_cmd,
+    call health#report_error('Failed to run: '. join(current_gem_cmd),
-          \ ['Report this issue with the output of: ', current_gem_cmd])
+          \ ['Report this issue with the output of: ', join(current_gem_cmd)])
     return
   endif
 
@@ -619,7 +619,7 @@ function! s:check_node() abort
           \ ['Install Node.js and verify that `node` and `npm` (or `yarn`) commands work.'])
     return
   endif
-  let node_v = get(split(s:system('node -v'), "\n"), 0, '')
+  let node_v = get(split(s:system(['node', '-v']), "\n"), 0, '')
   call health#report_info('Node.js: '. node_v)
   if s:shell_error || s:version_cmp(node_v[1:], '6.0.0') < 0
     call health#report_warn('Nvim node.js host does not support '.node_v)
@@ -660,8 +660,8 @@ function! s:check_node() abort
   let current_npm_cmd = ['node', host, '--version']
   let current_npm = s:system(current_npm_cmd)
   if s:shell_error
-    call health#report_error('Failed to run: '. string(current_npm_cmd),
+    call health#report_error('Failed to run: '. join(current_npm_cmd),
-          \ ['Report this issue with the output of: ', string(current_npm_cmd)])
+          \ ['Report this issue with the output of: ', join(current_npm_cmd)])
     return
   endif
 
@@ -734,8 +734,8 @@ function! s:check_perl() abort
   let current_cpan_cmd = [perl_exec, '-W', '-MNeovim::Ext', '-e', 'print $Neovim::Ext::VERSION']
   let current_cpan = s:system(current_cpan_cmd)
   if s:shell_error
-    call health#report_error('Failed to run: '. string(current_cpan_cmd),
+    call health#report_error('Failed to run: '. join(current_cpan_cmd),
-          \ ['Report this issue with the output of: ', string(current_cpan_cmd)])
+          \ ['Report this issue with the output of: ', join(current_cpan_cmd)])
     return
   endif
 

test/functional/plugin/health_spec.lua

@@ -230,3 +230,14 @@ describe('health.vim', function()
     end)
   end)
 end)
+
+describe(':checkhealth provider', function()
+  it("works correctly with a wrongly configured 'shell'", function()
+    clear()
+    command([[set shell=echo\ WRONG!!!]])
+    command('let g:loaded_perl_provider = 0')
+    command('let g:loaded_python3_provider = 0')
+    command('checkhealth provider')
+    eq(nil, string.match(curbuf_contents(), 'WRONG!!!'))
+  end)
+end)