jpickwell · September 1, 2018 00:28 · Sep 1, 2018
diff --git a/README.md b/README.md
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+This Capistrano task will loop through all of the repository files for the specified branch, and set the `atime` and `mtime` to the most recent (relative to each file) commit author date.
+
+I wrote this to get around a limitation in Webpacker 3.5.5 when deploying. Because of how Capistrano works, Webpacker would recompile every deploy even if no Webpack code had changed.
diff --git a/deploy.rb b/deploy.rb
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+# ...
+
+# Use the task during deployment.
+after 'deploy:set_current_revision', :set_mtimes
+
+# ...
diff --git a/set_mtimes.rake b/set_mtimes.rake
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+desc(
+  'Set the atime and mtime of all repo files based on the most recent' \
+  ' (relative to each file) commit author date.'
+)
+task :set_mtimes do
+  on release_roles :all do
+    within repo_path do
+      with fetch(:git_environmental_variables) do
+        # Everything is done in a single `execute` to avoid numerous SSH
+        # connections (one per file plus one to get the list of files).
+        #
+        # Because Capistrano uses `/usr/bin/env`, we need to "break out" of that
+        # by giving it a command name and redirecting output to the null device.
+        # `:echo` seems like the simplest and safest choice here.
+        #
+        # And because of SSHKit's `Symbol` quirk, the first argument must be a
+        # `Symbol` to ensure `within` and `with` apply to the loop.
+        execute(
+          :echo, '> /dev/null ;', <<~CMD
+            for path in $(git ls-tree --name-only -r "#{fetch(:branch)}"); do
+              touch -t $(git log -1 --format=%ad --date=format:%Y%m%d%H%M.%S "#{fetch(:branch)}" -- "${path}") "#{release_path}/${path}"
+            done
+          CMD
+        )
+      end
+    end
+  end
+end
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		This Capistrano task will loop through all of the repository files for the specified branch, and set the `atime` and `mtime` to the most recent (relative to each file) commit author date.

		I wrote this to get around a limitation in Webpacker 3.5.5 when deploying. Because of how Capistrano works, Webpacker would recompile every deploy even if no Webpack code had changed.
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