Function queryDevice

CloverPackage/utils/partutil/partutil.c:207–330

}

static
bool queryDevice(char const* deviceName, queryType query, char *answer, size_t answer_maxsize)
{
    struct stat buf;
    DADiskRef disk;
    CFDictionaryRef descDict;
    CFBooleanRef b_ref;
    bool result = false;
    int isMediaWhole = 0;

    assert(deviceName);

    char devFilePath[ MAXPATHLEN ];
    char *deviceFilePath = &devFilePath[0];

    strlcpy( deviceFilePath, _PATH_DEV, sizeof( devFilePath ) );
    strlcat( deviceFilePath, deviceName, sizeof( devFilePath ) );

    if (stat(deviceFilePath, &buf) < 0) {
        fprintf(stderr, "Error: stat failed on %s: %s\n", deviceFilePath, strerror(errno));
        return false;
    }
    if (!(buf.st_mode & (S_IFCHR | S_IFBLK))) {
        fprintf(stderr, "Error: %s is not a block or character special device\n", deviceFilePath);
        return false;
    }

    if (getDASessionAndDisk(deviceName, NULL, &disk) < 0)
		return false;

    descDict = DADiskCopyDescription(disk);
    CFRelease(disk);

	if (!descDict) {
		return false;
	}

    if (CFDictionaryGetValueIfPresent(descDict, kDADiskDescriptionMediaWholeKey, (void const**) &b_ref) &&
        CFBooleanGetValue(b_ref))
        isMediaWhole = 1;

    // If query partition scheme, the device must be a whole disk
    if (query == query_partitionscheme && !isMediaWhole) {
        fprintf(stderr, "Error: device must be a whole disk to query about partition scheme !\n");
        CFRelease(descDict);
        return false;
    }

    CFStringRef key = NULL;
    switch (query) {
        case query_fstype:
            key = kDADiskDescriptionVolumeKindKey;
            break;
        case query_bsdname:
            key = kDADiskDescriptionMediaBSDNameKey;
            break;
        case query_mountpoint:
            key = kDADiskDescriptionVolumePathKey;