a3954457b0
ALLOW_ADBD_NO_AUTH is removed, so better not mention it. Test: Build Change-Id: Id9d730475165a38cf340e10febffe2e5a9da6725
159 lines
6.3 KiB
Markdown
159 lines
6.3 KiB
Markdown
The Recovery Image
|
|
==================
|
|
|
|
Quick turn-around testing
|
|
-------------------------
|
|
|
|
* Devices using recovery-as-boot (e.g. Pixels, which set BOARD\_USES\_RECOVERY\_AS\_BOOT)
|
|
|
|
# After setting up environment and lunch.
|
|
m -j bootimage
|
|
adb reboot bootloader
|
|
|
|
# Pixel devices don't support booting into recovery mode with `fastboot boot`.
|
|
fastboot flash boot
|
|
|
|
# Manually choose `Recovery mode` from bootloader menu.
|
|
|
|
* Devices with a separate recovery image (e.g. Nexus)
|
|
|
|
# After setting up environment and lunch.
|
|
mm -j && m ramdisk-nodeps && m recoveryimage-nodeps
|
|
adb reboot bootloader
|
|
|
|
# To boot into the new recovery image without flashing the recovery partition:
|
|
fastboot boot $ANDROID_PRODUCT_OUT/recovery.img
|
|
|
|
Running the tests
|
|
-----------------
|
|
|
|
# After setting up environment and lunch.
|
|
mmma -j bootable/recovery
|
|
|
|
# Running the tests on device (under normal boot).
|
|
adb root
|
|
adb sync data
|
|
|
|
# 32-bit device
|
|
adb shell /data/nativetest/recovery_unit_test/recovery_unit_test
|
|
|
|
# Or 64-bit device
|
|
adb shell /data/nativetest64/recovery_unit_test/recovery_unit_test
|
|
|
|
Running the manual tests
|
|
------------------------
|
|
|
|
`recovery-refresh` and `recovery-persist` executables exist only on systems without
|
|
/cache partition. And we need to follow special steps to run tests for them.
|
|
|
|
- Execute the test on an A/B device first. The test should fail but it will log
|
|
some contents to pmsg.
|
|
|
|
- Reboot the device immediately and run the test again. The test should save the
|
|
contents of pmsg buffer into /data/misc/recovery/inject.txt. Test will pass if
|
|
this file has expected contents.
|
|
|
|
Using `adb` under recovery
|
|
--------------------------
|
|
|
|
When running recovery image from debuggable builds (i.e. `-eng` or `-userdebug` build variants, or
|
|
`ro.debuggable=1` in `/prop.default`), `adbd` service is enabled and started by default, which
|
|
allows `adb` communication. A device should be listed under `adb devices`, either in `recovery` or
|
|
`sideload` state.
|
|
|
|
$ adb devices
|
|
List of devices attached
|
|
1234567890abcdef recovery
|
|
|
|
Although `/system/bin/adbd` is built from the same code base as the one in the normal boot, only a
|
|
subset of `adb` commands are meaningful under recovery, such as `adb root`, `adb shell`, `adb push`,
|
|
`adb pull` etc. Since Android Q, `adb shell` no longer requires manually mounting `/system` from
|
|
recovery menu.
|
|
|
|
## Troubleshooting
|
|
|
|
### `adb devices` doesn't show the device.
|
|
|
|
$ adb devices
|
|
List of devices attached
|
|
|
|
* Ensure `adbd` is built and running.
|
|
|
|
By default, `adbd` is always included into recovery image, as `/system/bin/adbd`. `init` starts
|
|
`adbd` service automatically only in debuggable builds. This behavior is controlled by the recovery
|
|
specific `/init.rc`, whose source code is at `bootable/recovery/etc/init.rc`.
|
|
|
|
The best way to confirm a running `adbd` is by checking the serial output, which shows a service
|
|
start log as below.
|
|
|
|
[ 18.961986] c1 1 init: starting service 'adbd'...
|
|
|
|
* Ensure USB gadget has been enabled.
|
|
|
|
If `adbd` service has been started but device not shown under `adb devices`, use `lsusb(8)` (on
|
|
host) to check if the device is visible to the host.
|
|
|
|
`bootable/recovery/etc/init.rc` disables Android USB gadget (via sysfs) as part of the `fs` action
|
|
trigger, and will only re-enable it in debuggable builds (the `on property` rule will always run
|
|
_after_ `on fs`).
|
|
|
|
on fs
|
|
write /sys/class/android_usb/android0/enable 0
|
|
|
|
# Always start adbd on userdebug and eng builds
|
|
on property:ro.debuggable=1
|
|
write /sys/class/android_usb/android0/enable 1
|
|
start adbd
|
|
|
|
If device is using [configfs](https://www.kernel.org/doc/Documentation/usb/gadget_configfs.txt),
|
|
check if configfs has been properly set up in init rc scripts. See the [example
|
|
configuration](https://android.googlesource.com/device/google/wahoo/+/master/init.recovery.hardware.rc)
|
|
for Pixel 2 devices. Note that the flag set via sysfs (i.e. the one above) is no-op when using
|
|
configfs.
|
|
|
|
### `adb devices` shows the device, but in `unauthorized` state.
|
|
|
|
$ adb devices
|
|
List of devices attached
|
|
1234567890abcdef unauthorized
|
|
|
|
recovery image doesn't honor the USB debugging toggle and the authorizations added under normal boot
|
|
(because such authorization data stays in /data, which recovery doesn't mount), nor does it support
|
|
authorizing a host device under recovery. We can use one of the following options instead.
|
|
|
|
* **Option 1 (Recommended):** Authorize a host device with adb vendor keys.
|
|
|
|
For debuggable builds, an RSA keypair can be used to authorize a host device that has the private
|
|
key. The public key, defined via `PRODUCT_ADB_KEYS`, will be copied to `/adb_keys`. When starting
|
|
the host-side `adbd`, make sure the filename (or the directory) of the matching private key has been
|
|
added to `$ADB_VENDOR_KEYS`.
|
|
|
|
$ export ADB_VENDOR_KEYS=/path/to/adb/private/key
|
|
$ adb kill-server
|
|
$ adb devices
|
|
|
|
`-user` builds filter out `PRODUCT_ADB_KEYS`, so no `/adb_keys` will be included there.
|
|
|
|
Note that this mechanism applies to both of normal boot and recovery modes.
|
|
|
|
* **Option 2:** Allow `adbd` to connect without authentication.
|
|
* bootloader is unlocked (`ro.boot.verifiedbootstate` is `orange`) or debuggable build.
|
|
* `ro.adb.secure` has a value of `0`.
|
|
|
|
Both of the two conditions need to be satisfied. Although `ro.adb.secure` is a runtime property, its
|
|
value is set at build time (written into `/prop.default`). It defaults to `1` on `-user` builds, and
|
|
`0` for other build variants. The value is overridable via `PRODUCT_DEFAULT_PROPERTY_OVERRIDES`.
|
|
|
|
Localization of the background texts
|
|
------------------------------------
|
|
|
|
The recovery image supports localization of several background texts, e.g. installing, error,
|
|
factory reset warnings, etc. For devices using `xxhdpi` and `xxxhdpi`, the build system generates
|
|
these localization images dynamically since android-10 when building the recovery image. While
|
|
the static images under res-*dpi/images/ is used for other display resolutions and as a
|
|
backup.
|
|
|
|
Check the invocation of the image_generator tool in the [makefile]. And the detailed usage of the
|
|
image_generator is documented [here](./tools/image_generator/README.md).
|
|
|
|
[makefile]: https://android.googlesource.com/platform/build/+/refs/heads/master/core/Makefile#1800
|