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Commit 2c4d5dc4 authored by Mike Lockwood's avatar Mike Lockwood
Browse files

init: Add support for writing system property value to a file in init.rc 

The write command will write a property value if the value starts with a "$'

For example:
    write /sys/class/android_usb/iSerial $ro.serialno

Use double leading '$' if you need to write a string that starts with '$':

    write /data/foo $$hello

to write "$hello" to /data/foo

Change-Id: I55431ac7715a5347bb95c3a15aee97c575444dde
parent b36f1367

init/builtins.c

+17 −1
Original line number Diff line number Diff line
@@ -527,7 +527,23 @@ int do_sysclktz(int nargs, char **args) 


int do_write(int nargs, char **args)

{

    return write_file(args[1], args[2]);

    char *path = args[1];

    char *value = args[2];

    if (value[0] == '$') {

        /* Write the value of a system property if value starts with '$' */

        value++;

        if (value[0] != '$') {

            value = property_get(value);

            if (!value) {

                ERROR("property %s has no value for writing to %s\n", value, path);

                return -EINVAL;

            }

        } /* else fall through to support double '$' prefix for writing

           * string literals that start with '$'

           */

    }



    return write_file(path, value);

}



int do_copy(int nargs, char **args)