fix: accidentally jumps to FETCH_HEAD

lua/dep.lua

@@ -494,7 +494,28 @@ local function sync(package, cb)
         log_err(before)
         cb(err)
       else
-        local function continue(err, message)
+        if package.commit then
+          proc.git_checkout(package.dir, package.branch, package.commit, function(err, message)
+            if err then
+              log_err(message)
+              cb(err)
+            else
+              proc.git_rev_parse(package.dir, package.commit, function(err, after)
+                if err then
+                  log_err(after)
+                  cb(err)
+                elseif before == after then
+                  logger:log("skip", string.format("skipped %s", package.id))
+                  cb(err)
+                else
+                  mark_reconfigure(package)
+                  logger:log("update", string.format("updated %s; %s -> %s", package.id, before, after))
+                end
+              end)
+            end
+          end)
+        else
+          proc.git_fetch(package.dir, "origin", package.branch or "HEAD", function(err, message)
             if err then
               log_err(message)
               cb(err)
@@ -520,11 +541,7 @@ local function sync(package, cb)
                 end
               end)
             end
-        end
+          end)
-        if package.commit then
-          proc.git_checkout(package.dir, package.branch, package.commit, continue)
-        else
-          proc.git_fetch(package.dir, "origin", package.branch or "HEAD", continue)
         end
       end
     end)