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init: introduce ro.kernel.version property

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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: Alexander Potapenko <glider@google.com>
This commit is contained in:
Alexander Potapenko 2021-09-29 12:14:35 +00:00
parent bc6317592a
commit 1e966fa9f1
1 changed files with 15 additions and 0 deletions
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15
init/init.cpp
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@ -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);