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- report correct macOS version with older SDKs

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When built against 10.15 SDK or earlier, macOS 11.0+ returns 10.16 for compatibility, and external process is needed to output the actual version for us
This commit is contained in:
alexey.lysiuk 2021-06-15 10:35:33 +03:00
parent cf4c72d4a7
commit 256451115b
1 changed files with 66 additions and 3 deletions
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65
src/common/platform/posix/cocoa/i_main.mm
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@ -35,6 +35,7 @@
#include "s_soundinternal.h"
#include <sys/sysctl.h>
#include <sys/stat.h>
#include "c_console.h"
#include "c_cvars.h"
@ -89,15 +90,77 @@ struct NSOperatingSystemVersion
#endif // before 10.10
static bool ReadSystemVersionFromPlist(NSOperatingSystemVersion& version)
{
#if MAC_OS_X_VERSION_MAX_ALLOWED < 110000
// The version returned by macOS depends on the SDK which the software has been built against.
// When built against the 10.15 SDK or earlier, Big Sur returns 10.16 for compatibility with previous numbering.
// When built against the 11.0 SDK, it returns 11.0 for forward compatibility.
// https://eclecticlight.co/2020/08/13/macos-version-numbering-isnt-so-simple/
// It's impossible to load real SystemVersion.plist when linking with old SDK, i.e. when building for Intel CPU
// Any attempt to read this file is redirected to SystemVersionCompat.plist silently
// Workaround with the external process is needed in order to report correct macOS version
const char *const plistPath = "/System/Library/CoreServices/SystemVersion.plist";
struct stat dummy;
if (stat(plistPath, &dummy) != 0)
return false;
char commandLine[1024] = {};
snprintf(commandLine, sizeof commandLine, "defaults read %s ProductVersion", plistPath);
FILE *const versionFile = popen(commandLine, "r");
if (versionFile == nullptr)
return false;
NSOperatingSystemVersion plistVersion = {};
char versionString[256] = {};
if (fgets(versionString, sizeof versionString, versionFile))
{
plistVersion.majorVersion = atoi(versionString);
if (const char *minorVersionString = strstr(versionString, "."))
{
minorVersionString++;
plistVersion.minorVersion = atoi(minorVersionString);
if (const char *patchVersionString = strstr(minorVersionString, "."))
{
patchVersionString++;
plistVersion.patchVersion = atoi(minorVersionString);
}
}
}
fclose(versionFile);
if (plistVersion.majorVersion != 0)
{
version = plistVersion;
return true;
}
#endif // MAC_OS_X_VERSION_MAX_ALLOWED < 110000
return false;
}
void I_DetectOS()
{
NSOperatingSystemVersion version = {};
NSProcessInfo* const processInfo = [NSProcessInfo processInfo];
if (!ReadSystemVersionFromPlist(version))
{
NSProcessInfo *const processInfo = [NSProcessInfo processInfo];
if ([processInfo respondsToSelector:@selector(operatingSystemVersion)])
{
version = [processInfo operatingSystemVersion];
}
}
const char* name = "Unknown version";