1*e7c364b6SAndroid Build Coastguard Workerminadbd 2*e7c364b6SAndroid Build Coastguard Worker======= 3*e7c364b6SAndroid Build Coastguard Worker 4*e7c364b6SAndroid Build Coastguard Worker`minadbd` is analogous to the regular `adbd`, but providing the minimal services to support 5*e7c364b6SAndroid Build Coastguard Workerrecovery-specific use cases. Generally speaking, `adbd` = `libadbd` + `libadbd_services`, whereas 6*e7c364b6SAndroid Build Coastguard Worker`minadbd` = `libadbd` + `libminadbd_services`. 7*e7c364b6SAndroid Build Coastguard Worker 8*e7c364b6SAndroid Build Coastguard WorkerAlthough both modules may be installed into the recovery image, only one of them, or none, can be 9*e7c364b6SAndroid Build Coastguard Workeractive at any given time. 10*e7c364b6SAndroid Build Coastguard Worker 11*e7c364b6SAndroid Build Coastguard Worker- The start / stop of `adbd` is managed via system property `sys.usb.config`, when setting to `adb` 12*e7c364b6SAndroid Build Coastguard Worker or `none` respectively. Upon starting recovery mode, `adbd` is started in debuggable builds by 13*e7c364b6SAndroid Build Coastguard Worker default; otherwise `adbd` will stay off at all times in user builds. See the triggers in 14*e7c364b6SAndroid Build Coastguard Worker `bootable/recovery/etc/init.rc`. 15*e7c364b6SAndroid Build Coastguard Worker 16*e7c364b6SAndroid Build Coastguard Worker- `minadbd` is started by `recovery` as needed. 17*e7c364b6SAndroid Build Coastguard Worker - When requested to start `minadbd`, `recovery` stops `adbd` first, if it's running; it then forks 18*e7c364b6SAndroid Build Coastguard Worker and execs `minadbd` in a separate process. 19*e7c364b6SAndroid Build Coastguard Worker - `minadbd` talks to host-side `adb` server to get user requests. 20*e7c364b6SAndroid Build Coastguard Worker - `minadbd` handles some requests directly, e.g. querying device properties for rescue service. 21*e7c364b6SAndroid Build Coastguard Worker - `minadbd` communicates with `recovery` to fulfill requests regarding package installation. See 22*e7c364b6SAndroid Build Coastguard Worker the comments in `bootable/recovery/install/adb_install.cpp` for the IPC protocol between 23*e7c364b6SAndroid Build Coastguard Worker `recovery` and `minadbd`. 24*e7c364b6SAndroid Build Coastguard Worker - Upon exiting `minadbd`, `recovery` restarts `adbd` if it was previously running. 25