modify_plist.go

package main

/*
#cgo darwin CFLAGS: -DDARWIN -x objective-c
#cgo darwin LDFLAGS: -framework Cocoa
#import <Cocoa/Cocoa.h>
const char * ReadPlistAndRemoveKey(char *path, char *key)
{
	NSData *plistData = [NSData dataWithContentsOfFile:[NSString stringWithFormat:@"%s", path]];
	NSError *error;
	NSPropertyListFormat format;
	NSMutableDictionary *plist = [NSPropertyListSerialization propertyListWithData:plistData options:NSPropertyListMutableContainers format:&format error:&error];
	[plist removeObjectForKey:[NSString stringWithFormat:@"%s", key]];

	NSData *data = [NSPropertyListSerialization dataWithPropertyList: plist format:format options: 0 error: &error];
	if (data == nil) {
		const char * cerr = [[NSString stringWithFormat:@"ERROR: %@", error.localizedDescription] UTF8String];
		return cerr;
	}

	const char * cString = [data bytes];
	return cString;
}
*/
import "C"
import (
	"fmt"
	"strings"
	"unsafe"
)

func main() {
	path := "/Applications/Chess.app/Contents/Info.plist"
	// read plist at path and delete a key. get serialized byte array back.
	data := C.ReadPlistAndRemoveKey(C.CString(path), C.CString("BuildMachineOSBuild"))
	defer C.free(unsafe.Pointer(data))

	strData := C.GoString(data)
	fmt.Println(strings.TrimSpace(strData))
}