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platform_system_core
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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
Test: manual on a Pixel device
Signed-off-by: Alexander Potapenko <glider@google.com>
Merged-In: Icec640b8a7150b344d9aa3bc0bdbcdae050c7c45
Change-Id: I5af411e39da600e5e0f6703f3a2a4930d509e29d
This commit is contained in:
Alexander Potapenko 2021-09-29 12:14:35 +00:00
parent ab2257ee48
commit 1c496e94e0
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.
@ -824,6 +838,7 @@ 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);