fix: ssh adapter supports any system with /bin/sh (#161)

This allows support of other *nix operating systems where bash is not
universally present.

README.md

@@ -267,7 +267,7 @@ nvim oil-ssh://[username@]hostname[:port]/[path]
 
 This may look familiar. In fact, this is the same url format that netrw uses.
 
-Note that at the moment the ssh adapter does not support Windows machines, and it requires the server to have a `/bin/bash` binary as well as standard unix commands (`rm`, `mv`, `mkdir`, `chmod`, `cp`, `touch`, `ln`, `echo`).
+Note that at the moment the ssh adapter does not support Windows machines, and it requires the server to have a `/bin/sh` binary as well as standard unix commands (`rm`, `mv`, `mkdir`, `chmod`, `cp`, `touch`, `ln`, `echo`).
 
 ## API
 

lua/oil/adapters/ssh/connection.lua

@@ -83,12 +83,11 @@ end
 function SSHConnection.new(url)
   local command = SSHConnection.create_ssh_command(url)
   vim.list_extend(command, {
-    "/bin/bash",
-    "--norc",
+    "/bin/sh",
     "-c",
     -- HACK: For some reason in my testing if I just have "echo READY" it doesn't appear, but if I echo
     -- anything prior to that, it *will* appear. The first line gets swallowed.
-    "echo '_make_newline_'; echo '===READY==='; exec /bin/bash --norc",
+    "echo '_make_newline_'; echo '===READY==='; exec /bin/sh",
   })
   local term_bufnr = vim.api.nvim_create_buf(false, true)
   local self = setmetatable({

tests/url_spec.lua

@@ -4,7 +4,7 @@ describe("url", function()
   it("get_url_for_path", function()
     local cases = {
       { "", "oil://" .. util.addslash(vim.fn.getcwd()) },
-      { "term://~/oil.nvim//52953:/bin/bash", "oil://" .. vim.loop.os_homedir() .. "/oil.nvim/" },
+      { "term://~/oil.nvim//52953:/bin/sh", "oil://" .. vim.loop.os_homedir() .. "/oil.nvim/" },
       { "/foo/bar.txt", "oil:///foo/", "bar.txt" },
       { "oil:///foo/bar.txt", "oil:///foo/", "bar.txt" },
       { "oil:///", "oil:///" },