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agents: add /utm-test for building, running, and debugging changes
Gives agents a repeatable way to exercise a change in the real app before /utm-review: build UTM and dependencies, repackage a single dependency with scripts/fixup.sh, create and delete a throwaway test VM by scripting, find logs, debug, and test headless GUI and the iOS simulator. Assisted-by: Claude:claude-opus-5-5
This commit is contained in:
osy
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---
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name: utm-test
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description: Build, run, and debug a UTM change for real. Covers building UTM, building all dependencies or just one after changing it, creating a disposable test VM by scripting and deleting it afterwards, where logs go, debugging, headless GUI checks, and the iOS simulator. Use this when you need to run UTM, reproduce a bug, or check that a change works in the app and not just that it compiles. Run it before /utm-review.
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---
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# utm-test
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This is the canonical copy. The per-agent entries in `.claude/commands/` and
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`.opencode/command/` point here. Commands assume macOS on arm64 and the repo root
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as the working directory. `$SCRATCH` means your agent's scratch directory, or
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`mktemp -d` if you don't have one.
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## Ground rules
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- **Test only on VMs you created, and delete them when you're done.** Never start,
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change, or delete the user's VMs. Other agent sessions may be using UTM on the
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same machine. Ask before you kill a UTM process that you didn't launch.
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- **Run one UTM instance: your dev build.** `/Applications/UTM.app` has the same
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bundle id. Scripting then goes to whichever instance is running, and it can
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launch the release app instead of yours. A stale binary also silently ignores
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scripting parameters it doesn't know, so a new parameter can turn into a plain
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`start`. Check with `pgrep -fl "MacOS/UTM|QEMULauncher"` before you launch and
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after you finish.
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- **Report only what you saw.** If your test VM never runs the code path you
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changed, say so rather than implying the change was validated. Before you call
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a failure pre-existing, build `main` in a worktree and compare, and check the
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issue tracker.
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## Build UTM
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```sh
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xcodebuild -project UTM.xcodeproj -scheme macOS -configuration Debug \
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-destination 'platform=macOS,arch=arm64' build > "$SCRATCH/build.log" 2>&1
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grep -E "error:|^\*\* BUILD" "$SCRATCH/build.log" | sort -u
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APP=$(ls -dt ~/Library/Developer/Xcode/DerivedData/UTM-*/Build/Products/Debug/UTM.app | head -1)
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```
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- Match `^\*\* BUILD`. A bare `BUILD` can match a path. If a build fails, the app
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from the last good build is still on disk, so check the result before testing.
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- Swift code goes into `Contents/MacOS/UTM.debug.dylib`. To prove your change is in
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the binary you run, use `strings "$APP/Contents/MacOS/UTM.debug.dylib" | grep <marker>`.
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- The Debug build is signed through the local `CodeSigning.xcconfig`. Keep that
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signing when you intend to run the app. `CODE_SIGNING_ALLOWED=NO` drops the
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virtualization and networking entitlements. Even when signed, vmnet
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(Shared/Bridged) networking may fail locally, so test VMs should use emulated
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networking or none.
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- Compile-only checks for other platforms:
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- Add `CODE_SIGNING_ALLOWED=NO` and a separate `-derivedDataPath "$SCRATCH/dd-<scheme>"`.
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- Use `-destination 'generic/platform=iOS'` with scheme `iOS`, `iOS-SE`, or
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`iOS-Remote`, or `'generic/platform=visionOS'` with scheme `iOS`.
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- Add `ARCHS=arm64` to any `generic/` destination. Otherwise it tries to build
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universal and looks for `sysroot-*-arm64_x86_64`.
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- If SPM plugin validation fails after a package URL changes, pass
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`-skipPackagePluginValidation`.
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- **Baseline or per-commit builds:** don't check out over the user's tree.
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1. `git worktree add --detach "$SCRATCH/wt" <rev>`.
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2. Symlink every `sysroot-*` and `CodeSigning.xcconfig` into the worktree. A
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missing sysroot shows up as a misleading "missing resource" error.
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3. Build with its own `-derivedDataPath`.
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4. Remove the symlinks by name, then run `git worktree remove`.
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## Dependencies
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QEMU, SPICE, GLib, and the other native dependencies reach the app as frameworks
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in `sysroot-<Platform>-<arch>/Frameworks`. Xcode embeds them and re-signs them.
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### Full build
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Usually you don't need one. Download the `Sysroot-*` artifacts from a recent
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GitHub Actions run and extract them at the repo root. Build them yourself only
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when you're changing a dependency:
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```sh
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./scripts/build_dependencies.sh -p macos -a arm64 > "$SCRATCH/deps.log" 2>&1 # -p ios|ios-tci|ios_simulator|visionos|…
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grep -a "Building \|All done" "$SCRATCH/deps.log" | tail
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```
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- The build takes hours and deletes the sysroot before it starts.
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- It leaves source trees in `build-<Platform>-<arch>/`. Those trees are what the
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single-dependency path below needs, and CI artifacts don't include them.
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- A successful run ends with `All done` and writes `build-*/BUILD_SUCCESS`.
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- If a build dies from memory pressure (LLVM and Mesa are the heavy parts), set
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`NCPU=4`.
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- Source versions are pinned in `patches/sources`, and UTM's changes to them are
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in `patches/*.patch`. If you change a patch, check that it still applies to a
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fresh extract of the tarball: `patch -p1 --dry-run`.
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- If a staged sysroot crashes inside a framework on an older macOS, suspect the
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sysroot before your change. For example, a weak import of an SDK-new symbol is
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NULL on older systems. Check `nm -m <binary> | grep "weak external"`,
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`vtool -show-build <binary>`, and `git log -S<symbol> -- scripts/` against the
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sysroot's date.
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### Rebuild one dependency after a change
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1. **Rebuild the library in its tree.** The trees are gitignored, so there is no
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git safety net for your edits.
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- QEMU: build only the target you need:
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```sh
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ninja -C build-macOS-arm64/qemu-<ver>-utm/build libqemu-aarch64-softmmu.dylib
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```
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A small edit takes seconds. `ninja -t targets all | grep <file>` finds object
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targets.
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- Meson projects such as spice-gtk, spice, and virglrenderer:
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`meson install -C build-macOS-arm64/<tree>/utm_build`. This installs into the
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sysroot's `lib/`.
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- Autotools projects: `make -C build-macOS-arm64/<tree> install`.
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2. **Repackage it** into the framework the app embeds:
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```sh
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scripts/fixup.sh -p macos -s sysroot-macos-arm64 <path/to/libfoo.N.dylib>
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```
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- This writes `Frameworks/foo.N.framework` (the name drops `lib` and the last
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extension), sets the `@rpath` install name, and points imports of other
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sysroot libraries at their frameworks.
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- It is safe to re-run on a sysroot that has already been fixed up.
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- It matches sysroot libraries by file name, so it also works on a sysroot
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downloaded from CI, whose install names record the CI machine's paths.
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- `-i` rewrites only the imports of an executable, such as
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`libexec/virgl_render_server`, in place.
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- For iOS, pass `-p ios` and the iOS sysroot. That produces the flat framework
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layout.
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3. **Check the framework, then rebuild UTM** so Xcode copies it into the app:
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```sh
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otool -L sysroot-macos-arm64/Frameworks/<name>.framework/Versions/A/<name> | tail -n +2 | grep -v '@rpath\|/System/\|/usr/lib/' # prints nothing
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strings "$APP/Contents/Frameworks/<name>.framework/Versions/A/<name>" | grep -c <marker> # after xcodebuild
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```
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Testing a stale framework and concluding "no effect" is the most common way to
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waste time here.
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### Swift packages (CocoaSpice, QEMUKit, SwiftTerm)
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These are remote packages pinned in `Package.resolved`, not the sibling checkouts.
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There are two ways to test a change to one:
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- **Quick patch:** edit the checkout in
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`~/Library/Developer/Xcode/DerivedData/UTM-*/SourcePackages/checkouts/<Pkg>`.
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The files are read-only, so `chmod u+w` first. A normal `xcodebuild` picks the
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edit up. Revert afterwards with `git checkout -- <file>` inside the checkout.
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- **Local override:** add the local package folder to `project.pbxproj` as a
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folder reference (`lastKnownFileType = wrapper; path = ../<Pkg>`). Xcode then
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prefers it over the remote package. Remove the reference, and bump the pin once
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the package change is pushed.
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## Run a disposable test VM
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Launch the dev build yourself. Launching the binary directly is also how you
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capture its stdout and pass it environment variables. Wait with `is running`.
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Anything else sent before the app registers, even `tell application "$APP"`,
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launches a second instance.
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```sh
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caffeinate -d -u -t 3600 & # a sleeping display blocks Apple VM start and hides dialogs
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nohup "$APP/Contents/MacOS/UTM" > "$SCRATCH/utm-stdout.log" 2>&1 &
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until [ "$(osascript -e "application \"$APP\" is running")" = true ]; do sleep 1; done
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utm() { osascript -e "tell application \"$APP\"" -e "$1" -e "end tell"; }
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```
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Create a QEMU VM that boots to the EDK2 UEFI shell. It has no disk and no NIC (a
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NIC would add a PXE delay). It reaches `Shell>` in about 12 s:
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```sh
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VM="utm-test-$$"
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utm "make new virtual machine with properties {backend:qemu, configuration:{name:\"$VM\", architecture:\"aarch64\", drives:{}, network interfaces:{}, displays:{{hardware:\"virtio-gpu-gl-pci\"}}}}"
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utm "start virtual machine named \"$VM\""
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utm "get status of virtual machine named \"$VM\"" # stopped|starting|started|paused|…
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```
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- **Shape the VM to the code path you're testing.** The configuration record
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accepts `memory`, `cpu cores`, `hypervisor` (default true; use false for TCG),
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`uefi`, `drives` (`{{guest size:<MiB>}}`, or `{{removable:true, source:POSIX file "…"}}`
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for an ISO), `network interfaces`, `serial ports`, `displays`
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(`{}` for headless, or `hardware:"virtio-ramfb"` to use the 2D path instead of
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GL), and `qemu additional arguments`.
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- **Apple backend:** `{backend:apple, configuration:{name:"…"}}` creates a Linux
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VM with no display. The full vocabulary is in `Scripting/UTM.sdef`.
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- **Change the configuration** of a stopped VM:
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1. `set c to configuration of vm`
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2. Edit fields of `c`.
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3. `update configuration of vm with c`.
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Lists such as `drives` are replaced whole, so any element you leave out is
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removed.
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- **Other verbs:**
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- `start … saving false`: disposable run.
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- `stop … by force|kill|request`.
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- `suspend … saving true`.
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- `duplicate virtual machine named "X" with properties {configuration:{name:"Y"}}`.
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`duplicate` returns before the bundle exists on disk.
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- `$APP/Contents/MacOS/utmctl` has the same verbs. It exits 0 even when it
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fails, so read its output. It hangs if UTM's main thread is blocked.
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- **When testing a new verb or parameter, try it on your throwaway VM first.**
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Confirm that the new parameter takes effect before you point it anywhere else.
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A `delete` on a child object that can't be resolved has been applied to the
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parent VM.
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- **Bundles** are at `~/Library/Containers/com.utmapp.UTM/Data/Documents/<name>.utm`
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(`config.plist`, `Data/`). If you edit `config.plist` by hand, quit UTM first.
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For plists that contain dates or data, use `plutil -p` or PlistBuddy; `plutil -convert json`
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fails on them.
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### Verify it really worked
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A `started` status proves only that the process launched.
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- **Screenshot the VM window by ID.** This works even when other windows cover it.
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Look at the image; don't assume.
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```sh
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WID=$(osascript -l JavaScript -e "ObjC.import('CoreGraphics'); ObjC.deepUnwrap(ObjC.castRefToObject(\$.CGWindowListCopyWindowInfo(\$.kCGWindowListOptionAll, 0))).filter(w => w.kCGWindowOwnerName == 'UTM' && w.kCGWindowName == '$VM' && w.kCGWindowIsOnscreen).map(w => w.kCGWindowNumber).join('\n')")
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screencapture -x -o -l "$WID" "$SCRATCH/vm.png" && sips -Z 1200 "$SCRATCH/vm.png"
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```
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- A healthy run shows the EDK2 banner, `Mapping table`, and `Shell>`.
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- A black, torn, or frozen frame is a real failure.
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- Use `kCGWindowName == 'UTM'` for the library window. Don't match on size: a
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500×500 offscreen helper window also exists.
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- A disposable run's window is titled "<VM> – Disposable Mode" in
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Accessibility, but "<VM>" here.
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- **Serial I/O without the GUI:** the default ptty serial port carries the
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firmware console both ways.
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```sh
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P=$(utm "get address of serial port 1 of virtual machine named \"$VM\"")
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cat "$P" > "$SCRATCH/serial.txt" &
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printf 'ver\r' > "$P"
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```
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The shell's reply lands in `serial.txt`, with ANSI escapes.
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- **Check the status again** after the checks above. A guest that crashed can
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still report `started` for a moment.
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- **Performance:** measure before and after in the same session, and re-run
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outliers. Say whether Debug Log was on (see below).
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### Clean up
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```sh
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utm "stop virtual machine named \"$VM\" by force"
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until [ "$(utm "get status of virtual machine named \"$VM\"")" = stopped ]; do sleep 1; done
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utm "delete virtual machine named \"$VM\"" # no confirmation; refused while running
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utm quit; pkill caffeinate
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pgrep -fl "MacOS/UTM|QEMULauncher" # expect nothing of yours
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```
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- `quit` fails with -128 while any VM is running or paused, because a
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confirmation dialog blocks it.
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- `pkill` on UTM can orphan `QEMULauncher`, which keeps `efi_vars.fd` locked
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("Is another process using the image"). Kill any leftover launcher of yours.
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- Remove every temporary hook, log line, and dependency-tree edit. `/utm-review`
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flags stray diagnostics, and `git status` doesn't see the gitignored `build-*`
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trees. Tag temporary code with a marker you can grep for.
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## Observe and debug
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- **App stdout is the main log.** Everything `QEMULogging` receives is `NSLog`ed
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there: the QEMU command line and environment, `[CocoaSpice]`, `GSpice-*`, QMP,
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and app logging.
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- **`Data/debug.log` in the bundle** only gets the launch header, even with Debug
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Log on.
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- **The unified log:**
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`log show --last 5m --info --debug --style compact --predicate 'process IN {"UTM","QEMUHelper","QEMULauncher"}'`.
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Use `/usr/bin/log` in zsh, where `log` is a builtin.
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- **Swift `logger.debug` is hidden** at the default level. Temporarily set
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`logLevel` to `.debug` in `Services/UTMLoggingSwift.swift`, and don't commit it.
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- **To get output from CocoaSpice**, use `g_message()`, which always passes the
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handler in `CSMain.m`. `g_debug()` output only appears with SPICE debugging on.
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- **QEMU's own stderr reaches no log.** QEMU runs in `QEMULauncher` under
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`QEMUHelper` (XPC), sandboxed, with an environment built explicitly by
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`Services/UTMQemuSystem.m`. It does not inherit the app's environment.
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- To trace inside QEMU, write to a file in
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`~/Library/Group Containers/WDNLXAD4W8.com.utmapp.UTM/`.
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- To pass an environment variable to QEMU, add it in `UTMQemuSystem.m`
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temporarily.
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- `ps eww -p <launcher pid>` shows what QEMU actually got.
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- **The VM's Debug Log setting** injects `MTL_DEBUG_LAYER`, `MVK_DEBUG`,
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`VK_LOADER_DEBUG`, `MESA_DEBUG`, and `VIRGL_LOG_LEVEL` into QEMU, which costs
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performance.
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- **Hangs:** run `sample <pid> 2 -file "$SCRATCH/utm.sample"` and read the main
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thread's stack.
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- **Crashes:** reports are at `~/Library/Logs/DiagnosticReports/UTM*.ips`. The file
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is JSON after the first line; use `threads[<triggered>].frames` together with
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`usedImages`.
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- **lldb:** the Debug build has `get-task-allow`, so you can attach and script it:
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`lldb -p $(pgrep -f "Debug/UTM.app/Contents/MacOS/UTM$") --batch -o '…' -o detach`.
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- Give breakpoints `-G true` (auto-continue). A breakpoint that stops freezes
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UTM, and every scripted step then hangs.
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- A slow app may simply have a debugger attached.
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- **Hard-to-reach UI states:** add a temporary environment-variable hook, such as
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selecting a VM or switching a tab in `ContentView.onAppear`. Launch with
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`env UTM_TMP_X=… "$APP/Contents/MacOS/UTM"`, then remove the hook.
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- **Stale state:** AppKit and user defaults can mask a change. The VM registry is
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in `defaults read com.utmapp.UTM Registry`. Toolbars are autosaved under
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`NSToolbar Configuration <id>`.
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## Headless GUI input (macOS)
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- **System Events clicks** don't register on SwiftUI lists, menu extras, and some
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toolbar items. Build a small `swiftc` tool instead: post `.mouseMoved`, wait
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about 100 ms, then post `.leftMouseDown` and `.leftMouseUp` through
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`CGEvent(mouseEventSource:…).post(tap: .cghidEventTap)`.
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- **Coordinates are points.** Retina screenshots are 2× that, so downscale with
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`sips -Z <screen width in points>` to make image pixels match points.
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- **Bring UTM to the front** before each click, and take a screenshot after each
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click to check what happened:
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`tell application "System Events" to set frontmost of process "UTM" to true`.
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- **Typing into guests:** send text slowly. The Virtualization.framework view
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drops shifted characters and some punctuation from `keystroke`, so use
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`key code` or choose commands that don't need them.
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- **Locked screen:** check with `ioreg -n Root -d1 -a | grep -A1 CGSSessionScreenIsLocked`.
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- While the screen is locked, input and Accessibility do nothing, and window
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capture may fail too.
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- Fall back to serial or logs, or ask the user to unlock.
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- System consent dialogs belong to `UserNotificationCenter` and don't appear
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while the display sleeps.
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- **Launch method:** `open -a "$APP"` makes UTM the responsible process for
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privacy prompts. Launching the binary from a shell makes the terminal
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responsible instead, but `open` loses the stdout log.
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## iOS simulator
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```sh
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xcodebuild -project UTM.xcodeproj -scheme iOS -configuration Debug -destination "platform=iOS Simulator,id=$UDID" \
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ARCHS=arm64 ONLY_ACTIVE_ARCH=YES CODE_SIGNING_ALLOWED=NO build # needs sysroot-iOS_Simulator-arm64
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IOSAPP=$(ls -dt ~/Library/Developer/Xcode/DerivedData/UTM-*/Build/Products/Debug-iphonesimulator/UTM.app | head -1)
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xcrun simctl boot $UDID; xcrun simctl bootstatus $UDID -b; xcrun simctl install $UDID "$IOSAPP"
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xcrun simctl spawn $UDID defaults write com.utmapp.UTM ReleaseNotesLastVersion \
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"$(defaults read "$IOSAPP/Info.plist" CFBundleShortVersionString)" # skip What's New
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```
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- **Use a device you created** with `simctl create`, and run one simulator at a
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time. Parallel simulators hang `simctl`.
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- **Boot errors:** if boot fails with "Invalid argument" or the device wedges,
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run `simctl shutdown`, boot again, and wait for `bootstatus`.
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- **Seed a VM:** create one on macOS as above, then copy it with `cp -c -R` into
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`$(xcrun simctl get_app_container $UDID com.utmapp.UTM data)/Documents/`.
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Resolve that path each time, because it changes on reinstall.
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- **There is no scripting on iOS.** Drive the app with a temporary
|
||||
environment-variable hook, passed as `SIMCTL_CHILD_<VAR>=… xcrun simctl launch …`.
|
||||
For taps, use a throwaway XCUITest target (`bundle.ui-testing`, no host app)
|
||||
run with `test-without-building`.
|
||||
- **Observe:** `xcrun simctl io $UDID screenshot out.png`, and
|
||||
`xcrun simctl spawn $UDID log show --last 2m --style compact --predicate 'process == "UTM"'`.
|
||||
lldb can't attach, because UTM ptraces itself for JIT.
|
||||
- **iOS runs QEMU in-process, once per process.** Stopping a VM quits the app.
|
||||
- **Clean up:** `xcrun simctl shutdown $UDID`, and delete any device you created.
|
||||
@@ -0,0 +1,11 @@
|
||||
---
|
||||
description: Build, run, and debug a UTM change against a throwaway test VM (also dependency rebuilds via scripts/fixup.sh). Run before /utm-review.
|
||||
argument-hint: [what to verify]
|
||||
allowed-tools: Bash, Read, Grep, Glob, Edit, Write, Skill, Task
|
||||
---
|
||||
|
||||
Read and follow `.agents/skills/utm-test/SKILL.md`. Use your scratchpad
|
||||
directory as `$SCRATCH`, and Read every screenshot you capture: actually look at
|
||||
the image. Run long builds in the background.
|
||||
|
||||
What to verify in this run (if any): $ARGUMENTS
|
||||
@@ -0,0 +1,8 @@
|
||||
---
|
||||
description: Build, run, and debug a UTM change against a throwaway test VM (also dependency rebuilds via scripts/fixup.sh). Run before /utm-review.
|
||||
---
|
||||
|
||||
Follow this workflow. View every screenshot you capture: actually look at the
|
||||
image. What to verify in this run (if any): $ARGUMENTS
|
||||
|
||||
@.agents/skills/utm-test/SKILL.md
|
||||
Reference in New Issue
Block a user