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Commit 1e966fa9 authored by Alexander Potapenko's avatar Alexander Potapenko
Browse files

init: introduce ro.kernel.version property 



This property will hold the major.minor part of the kernel version (e.g. "5.4"), allowing init scripts to act depending on that version, enabling and disabling certain features.

Bug: 194156700
Change-Id: Icec640b8a7150b344d9aa3bc0bdbcdae050c7c45
Test: manual on a Pixel device
Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
parent bc631759

init/init.cpp

+15 −0
Original line number Diff line number Diff line
@@ -27,6 +27,7 @@ 
#include <sys/mount.h>

#include <sys/signalfd.h>

#include <sys/types.h>

#include <sys/utsname.h>

#include <unistd.h>



#define _REALLY_INCLUDE_SYS__SYSTEM_PROPERTIES_H_
@@ -554,6 +555,19 @@ static void SetUsbController() { 
    }

}



/// Set ro.kernel.version property to contain the major.minor pair as returned

/// by uname(2).

static void SetKernelVersion() {

    struct utsname uts;

    unsigned int major, minor;



    if ((uname(&uts) != 0) || (sscanf(uts.release, "%u.%u", &major, &minor) != 2)) {

        LOG(ERROR) << "Could not parse the kernel version from uname";

        return;

    }

    SetProperty("ro.kernel.version", android::base::StringPrintf("%u.%u", major, minor));

}



static void HandleSigtermSignal(const signalfd_siginfo& siginfo) {

    if (siginfo.ssi_pid != 0) {

        // Drop any userspace SIGTERM requests.
@@ -858,6 +872,7 @@ int SecondStageMain(int argc, char** argv) { 
    export_oem_lock_status();

    MountHandler mount_handler(&epoll);

    SetUsbController();

    SetKernelVersion();



    const BuiltinFunctionMap& function_map = GetBuiltinFunctionMap();

    Action::set_function_map(&function_map);