fix: remind to build before install

e2e/tests-dfx/build_granular.bash

@@ -47,7 +47,7 @@ teardown() {
   dfx build e2e_project_backend
   # validate assets canister wasn't built and can't be installed
   assert_command_fail dfx canister install e2e_project_frontend
-  assert_match "No such file or directory"
+  assert_match "The canister must be built before install. Please run \`dfx build\`."
 }
 
 

e2e/tests-dfx/install.bash

@@ -211,3 +211,10 @@ teardown() {
   assert_command_fail dfx canister install --all --argument '()'
   assert_contains "error: the argument '--all' cannot be used with '--argument <ARGUMENT>'"
 }
+
+@test "remind to build before install" {
+  dfx_start
+  dfx canister create --all
+  assert_command_fail dfx canister install e2e_project_backend
+  assert_contains "The canister must be built before install. Please run \`dfx build\`."
+}

src/dfx/src/lib/operations/canister/install_canister.rs

@@ -107,9 +107,13 @@ pub async fn install_canister(
     let wasm_path: PathBuf = if let Some(wasm_override) = wasm_path_override {
         wasm_override.into()
     } else {
-        canister_info
+        let build_wasm_path = canister_info
             .map(|info| info.get_build_wasm_path())
-            .context("Failed to find wasm")?
+            .context("Failed to find wasm")?;
+        if !build_wasm_path.exists() {
+            bail!("The canister must be built before install. Please run `dfx build`.");
+        }
+        build_wasm_path
     };
     let wasm_module = std::fs::read(&wasm_path)
         .with_context(|| format!("Failed to read {}.", &wasm_path.display()))?;