diff --git a/README.md b/README.md
index a533dc89..d8f0bcb5 100644
--- a/README.md
+++ b/README.md
@@ -51,19 +51,7 @@ jobs:
         signingKey: '${{ secrets.CACHIX_SIGNING_KEY }}'
         # Only needed for private caches
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-```
-
-Alternatively, you can use this action to only configure cachix for substitution:
-
-```yaml
-...
-    - uses: cachix/cachix-action@v5
-      with:
-        name: mycache
-        skipNixBuild: true
-        # Only needed for private caches
-        authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-...
+    - run: nix-build
 ```
 
 See [action.yml](action.yml) for all options.
diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
deleted file mode 100644
index 9a95d3e8..00000000
--- a/__tests__/main.test.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-import {prependEach, nonEmptySplit} from '../src/strings'
-
-test('prependEach', async() => {
-    expect(prependEach('-A', ["foo", "bar"])).toEqual(["-A", "foo", "-A", "bar"]);
-    expect(prependEach('-A', [])).toEqual([]);
-});
-
-test('nonEmptySplit', async() => {
-    expect(nonEmptySplit("", /\s+/)).toEqual([]);
-    expect(nonEmptySplit("foo bar", /\s+/)).toEqual(["foo", "bar"]);
-})
-
-// TODO: hopefully github actions will support integration tests
\ No newline at end of file
diff --git a/action.yml b/action.yml
index bb2d5efd..113f67e4 100644
--- a/action.yml
+++ b/action.yml
@@ -9,17 +9,12 @@ inputs:
     description: 'Authentication token for Cachix, needed only for private cache access'
   signingKey:
     description: 'Signing key secret retrieved after creating binary cache on https://cachix.org'
-  skipNixBuild:
-    description: 'Set to true to not invoke nix-build after setup.'
-  file:
-    description: 'Nix file to build. Defaults to default.nix'
-  attributes:
-    description: 'Nix attributes to nix-build. By default, all attributes are built.'
-  nixBuildArgs:
-    description: 'Additional arguments for nix-build.'
+  skipPush:
+    description: 'Set to true to disable pushing build results to the cache'
 branding:
   color: 'blue'
   icon: 'database'
 runs:
   using: 'node12'
   main: 'dist/main/index.js'
+  post: 'dist/main/index.js'
diff --git a/dist/main/index.js b/dist/main/index.js
index 6c991a67..c3390a7d 100644
--- a/dist/main/index.js
+++ b/dist/main/index.js
@@ -971,20 +971,18 @@ var __importStar = (this && this.__importStar) || function (mod) {
 };
 Object.defineProperty(exports, "__esModule", { value: true });
 const core = __importStar(__webpack_require__(470));
+const coreCommand = __importStar(__webpack_require__(431));
 const exec = __importStar(__webpack_require__(986));
-const strings_1 = __webpack_require__(443);
-function run() {
+exports.IsPost = !!process.env['STATE_isPost'];
+// inputs
+const name = core.getInput('name', { required: true });
+const signingKey = core.getInput('signingKey');
+const authToken = core.getInput('authToken');
+const skipPush = core.getInput('skipPush');
+const cachixExecutable = '/nix/var/nix/profiles/per-user/runner/profile/bin/cachix';
+function setup() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
-            // inputs
-            const name = core.getInput('name', { required: true });
-            const file = core.getInput('file');
-            const skipNixBuild = core.getInput('skipNixBuild');
-            const attributes = core.getInput('attributes');
-            const nixBuildArgs = core.getInput('nixBuildArgs');
-            const signingKey = core.getInput('signingKey');
-            const authToken = core.getInput('authToken');
-            const cachixExecutable = "/nix/var/nix/profiles/per-user/runner/profile/bin/cachix";
             core.startGroup('Cachix: installing');
             yield exec.exec('nix-env', ['--quiet', '-iA', 'cachix', '-f', 'https://cachix.org/api/v1/install']);
             core.endGroup();
@@ -997,31 +995,23 @@ function run() {
             core.endGroup();
             if (signingKey !== "") {
                 core.exportVariable('CACHIX_SIGNING_KEY', signingKey);
+                // Remember existing store paths
+                yield exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' > /tmp/store-path-pre-build`]);
             }
-            if (skipNixBuild !== 'true') {
-                const args = strings_1.prependEach('-A', strings_1.nonEmptySplit(attributes, /\s+/)).concat([file || "default.nix"]);
-                const additionalArgs = strings_1.nonEmptySplit(nixBuildArgs, /\s+/);
-                const allArgs = additionalArgs.concat(args);
-                core.startGroup(`nix-build ${allArgs.join(' ')}`);
-                if (signingKey !== "") {
-                    // Remember existing store paths
-                    yield exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' > store-path-pre-build`]);
-                }
-                let paths = '';
-                const options = {
-                    listeners: {
-                        stdout: (data) => {
-                            paths += data.toString();
-                        },
-                    }
-                };
-                yield exec.exec('nix-build', allArgs, options);
+        }
+        catch (error) {
+            core.setFailed(`Action failed with error: ${error}`);
+            throw (error);
+        }
+    });
+}
+function upload() {
+    return __awaiter(this, void 0, void 0, function* () {
+        try {
+            if (signingKey !== "" && skipPush !== 'true') {
+                core.startGroup('Cachix: pushing paths');
+                yield exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' | cat - /tmp/store-path-pre-build | sort | uniq -u  | ${cachixExecutable} push ${name}`]);
                 core.endGroup();
-                if (signingKey !== "") {
-                    core.startGroup('Cachix: pushing paths');
-                    yield exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' | cat - store-path-pre-build | sort | uniq -u  | ${cachixExecutable} push ${name}`]);
-                    core.endGroup();
-                }
             }
         }
         catch (error) {
@@ -1030,7 +1020,17 @@ function run() {
         }
     });
 }
-run();
+// Main
+if (!exports.IsPost) {
+    // Publish a variable so that when the POST action runs, it can determine it should run the cleanup logic.
+    // This is necessary since we don't have a separate entry point.
+    coreCommand.issueCommand('save-state', { name: 'isPost' }, 'true');
+    setup();
+}
+else {
+    // Post
+    upload();
+}
 
 
 /***/ }),
@@ -1125,26 +1125,6 @@ function escapeProperty(s) {
 }
 //# sourceMappingURL=command.js.map
 
-/***/ }),
-
-/***/ 443:
-/***/ (function(__unusedmodule, exports) {
-
-"use strict";
-
-Object.defineProperty(exports, "__esModule", { value: true });
-function prependEach(elem, array) {
-    const init = [];
-    return array.reduce((r, a) => r.concat(elem, a), init);
-}
-exports.prependEach = prependEach;
-;
-function nonEmptySplit(str, separator) {
-    return str.split(separator).filter(word => word != "");
-}
-exports.nonEmptySplit = nonEmptySplit;
-
-
 /***/ }),
 
 /***/ 470:
diff --git a/package.json b/package.json
index 4b2d3cf7..1e978369 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "main": "dist/main/index.js",
   "scripts": {
     "build": "tsc && ncc build -o dist/main src/main.ts",
-    "test": "jest"
+    "test": "echo NO TEST"
   },
   "repository": {
     "type": "git",
diff --git a/src/main.ts b/src/main.ts
index 3f9587dc..57fd5fe7 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -1,21 +1,18 @@
 import * as core from '@actions/core';
+import * as coreCommand from '@actions/core/lib/command'
 import * as exec from '@actions/exec';
-import { prependEach, nonEmptySplit } from './strings';
-import { exit } from 'process';
 
+export const IsPost = !!process.env['STATE_isPost']
 
-async function run() {
-  try {
-    // inputs
-    const name = core.getInput('name', { required: true });
-    const file = core.getInput('file');
-    const skipNixBuild = core.getInput('skipNixBuild');
-    const attributes = core.getInput('attributes');
-    const nixBuildArgs = core.getInput('nixBuildArgs');
-    const signingKey = core.getInput('signingKey');
-    const authToken = core.getInput('authToken')
-    const cachixExecutable = "/nix/var/nix/profiles/per-user/runner/profile/bin/cachix";
+// inputs
+const name = core.getInput('name', { required: true });
+const signingKey = core.getInput('signingKey');
+const authToken = core.getInput('authToken')
+const skipPush = core.getInput('skipPush');
+const cachixExecutable = '/nix/var/nix/profiles/per-user/runner/profile/bin/cachix';
 
+async function setup() {
+  try {
     core.startGroup('Cachix: installing')
     await exec.exec('nix-env', ['--quiet', '-iA', 'cachix', '-f', 'https://cachix.org/api/v1/install']);
     core.endGroup()
@@ -31,36 +28,21 @@ async function run() {
 
     if (signingKey !== "") {
       core.exportVariable('CACHIX_SIGNING_KEY', signingKey);
+      // Remember existing store paths
+      await exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' > /tmp/store-path-pre-build`]);
     }
+  } catch (error) {
+    core.setFailed(`Action failed with error: ${error}`);
+    throw (error);
+  }
+}
 
-    if (skipNixBuild !== 'true') {
-      const args = prependEach('-A', nonEmptySplit(attributes, /\s+/)).concat([file || "default.nix"]);
-      const additionalArgs = nonEmptySplit(nixBuildArgs, /\s+/);
-      const allArgs = additionalArgs.concat(args);
-
-      core.startGroup(`nix-build ${allArgs.join(' ')}`);
- 
-      if (signingKey !== "") {
-        // Remember existing store paths
-        await exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' > store-path-pre-build`]);
-      }
-
-      let paths = '';
-      const options = {
-        listeners: {
-          stdout: (data: Buffer) => {
-            paths += data.toString();
-          },
-        }
-      };
-      await exec.exec('nix-build', allArgs, options);
-      core.endGroup()
-
-      if (signingKey !== "") {
-        core.startGroup('Cachix: pushing paths');
-        await exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' | cat - store-path-pre-build | sort | uniq -u  | ${cachixExecutable} push ${name}`]);
-        core.endGroup();
-      }
+async function upload() {
+  try {
+    if (signingKey !== "" && skipPush !== 'true') {
+      core.startGroup('Cachix: pushing paths');
+      await exec.exec("sh", ["-c", `nix path-info --all | grep -v '\.drv$' | cat - /tmp/store-path-pre-build | sort | uniq -u  | ${cachixExecutable} push ${name}`]);
+      core.endGroup();
     }
   } catch (error) {
     core.setFailed(`Action failed with error: ${error}`);
@@ -68,4 +50,13 @@ async function run() {
   }
 }
 
-run();
+// Main
+if (!IsPost) {
+  // Publish a variable so that when the POST action runs, it can determine it should run the cleanup logic.
+  // This is necessary since we don't have a separate entry point.
+  coreCommand.issueCommand('save-state', {name: 'isPost'}, 'true')
+  setup()
+} else {
+  // Post
+  upload()
+}
diff --git a/src/strings.ts b/src/strings.ts
deleted file mode 100644
index fc6eb0c3..00000000
--- a/src/strings.ts
+++ /dev/null
@@ -1,8 +0,0 @@
-export function prependEach (elem: string, array: string[]): string[] {
-  const init: string[] = [];
-  return array.reduce((r, a) => r.concat(elem, a), init)
-};
-  
-export function nonEmptySplit (str: string, separator): string[] {
-  return str.split(separator).filter(word => word != "")
-}
\ No newline at end of file