fix(lockfile): Update with fetch/pull based on commit

Depending if there is a commit found the update command will either
fetch or pull. It will fetch if there is a commit found else it will
pull.

Author: EdenEast

lua/packer/plugin_types/git.lua

@@ -225,26 +225,24 @@ end
 local get_depth = function(plugin)
   if config.is_lockfile then
     local info = lockfile.get(plugin.short_name)
-    return info.date and fmt('--shallow-since="%s"', info.date) or '--depth=999999'
+    return info.date and fmt(' --shallow-since="%s"', info.date) or ' --depth=999999'
   else
     local depth = plugin.commit and 999999 or config.depth
-    return fmt('--depth="%s"', depth)
+    return fmt(' --depth="%s"', depth)
   end
 end
 
 git.setup = function(plugin)
+  local depth_opt = get_depth(plugin)
   local plugin_name = util.get_plugin_full_name(plugin)
   local install_to = plugin.install_path
-  local install_cmd = vim.split(config.exec_cmd .. config.subcommands.install, '%s+')
-  install_cmd[#install_cmd + 1] = get_depth(plugin)
+  local install_cmd = vim.split(config.exec_cmd .. config.subcommands.install .. depth_opt, '%s+')
 
   local submodule_cmd = config.exec_cmd .. config.subcommands.submodules
   local rev_cmd = config.exec_cmd .. config.subcommands.get_rev
 
-  local use_fetch = config.is_lockfile or plugin.commit or plugin.tag
-  local update_subcmd = use_fetch and config.subcommands.fetch or config.subcommands.update
-  local update_cmd = vim.split(config.exec_cmd .. update_subcmd, '%s+')
-  update_cmd[#update_cmd + 1] = get_depth(plugin)
+  local fetch_cmd = vim.split(config.exec_cmd .. config.subcommands.fetch .. depth_opt, '%s+')
+  local pull_cmd = vim.split(config.exec_cmd .. config.subcommands.update .. depth_opt, '%s+')
 
   local branch_cmd = config.exec_cmd .. config.subcommands.current_branch
   local current_commit_cmd = vim.split(config.exec_cmd .. config.subcommands.get_header, '%s+')
@@ -441,6 +439,8 @@ git.setup = function(plugin)
 
       disp:task_update(plugin_name, 'pulling updates...')
 
+      local commit = plugin.commit or get_lockfile_info(plugin).commit
+      local update_cmd = commit and fetch_cmd or pull_cmd
       r
         :and_then(await, jobs.run(update_cmd, update_opts))
         :and_then(await, jobs.run(submodule_cmd, update_opts))