High Altitude Oolong: 5月 2017

2017/5/25

reconfig timezone

dpkg-reconfigure tzdata

2017/5/24

2017/5/23

brctl bridge

brctl 就操作 bridge network 的command,
network bridge 可以視為軟體的網卡。

brctl addbr br0

就等於插了一張網卡 br0
這時候用 ifconfig 就可以操作 br0 了，像一般網卡一樣設定 ipaddres... etc

另外這個網卡有兩個端點，一個端點接到本機，就叫 br0.
另外一端可以隨你高興接到那裡..
這個就要用 brctl 命令才操作。
--- 略 (我也部會)

在 /etc/network/interfaces 裡也可以 config bridge 網卡..
和一般nic 的差異是，property 會有 ..bridge_ports 和一堆 bridge_XXX
其中 bridge_ports 就是指定另一端要接到哪裡..

auto mybr0
iface mybr0 inet dhcp
  bridge_ports eth0

就會把另一端接到 eth0 出口 ..
這樣就可以像 eth0 nic 一樣，從外面的dhcp server 拿到 ip ..

用在 lxc 時，另一端就接到 lxc vm 上，
所以就先給一個隨便的名子。
lxc vm 啟動的時候，他會依照 config 的內容把自己的 nic bound 到 mybr0 上..

log -- lxc static ip nat

sudo brctl addbr lxcbr0
sudo ifconfig -a lxcbr0
lxcbr0    Link encap:Ethernet  HWaddr b2:63:51:ae:XX:XX  
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
sudo ifconfig lxcbr0 10.10.20.1/24 up
sudo ifconfig -a lxcbr0
lxcbr0    Link encap:Ethernet  HWaddr b2:63:51:ae:XX:XX  
          inet addr:10.10.20.1  Bcast:10.10.20.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:8756 (8.5 KiB)

修改 /var/lib/lxc/mylxc/config:

＃lxc.network.type = empty
lxc.network.type = vnet
lxc.network.link = lxcbr0
lxc.network.flags = up

啟動 lxc-start -n mylxc
這時候，host 的 iface 會多出一個奇怪名子的 interface，跟 lxcbr0 bound 在一起..
host 上...

sudo ifconfig
lxcbr0    Link encap:Ethernet  HWaddr fe:0f:87:47:XX  
          inet addr:10.10.20.1  Bcast:10.10.20.255  Mask:255.255.255.0
          inet6 addr: fe80::fc83:faff:fe48:5849/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:16 errors:0 dropped:0 overruns:0 frame:0
          TX packets:161 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:1072 (1.0 KiB)  TX bytes:27958 (27.3 KiB)

veth3JU39Y Link encap:Ethernet  HWaddr fe:0f:87:47:XX  
          inet6 addr: fe80::fc0f:87ff:fe47:d33f/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:56 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:648 (648.0 B)  TX bytes:6440 (6.2 KiB)

用 brctl 來看...

sudo brctl show
bridge name bridge id  STP enabled interfaces
lxcbr0  8000.fe0f8747d33f no  veth3JU39Y

現在看 lxc ...
mylxc 的 /etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 10.10.20.10
netmask 255.255.255.0

如果不是，改好以後重開機..
ifconfig 看已經是 eth0 10.10.20.10 了，但是用 route -n 看..

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.10.20.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0

沒有 default gateway...
手動設..

route add default gw 10.10.20.1
route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.10.20.1      0.0.0.0         UG    0      0        0 eth0
10.10.20.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0

這時後 ping 10.10.20.1 已經OK

lxc . static ip,

就 lxc-create 完後直接 lxc-start。
rootfs 已經改好，不用進去 mknode tty..
stop 的時候就 lxc-stop --nokill
如果直接 lxc-stop ，就會hang住很久，然後有 input/output error

最後是 ref:https://l3net.wordpress.com/2013/08/25/debian-virtualization-lxc-network-isolation/
手動啟動 bridge 才讓 lxc 的網路連通。

host:

# brctl addbr br0
# ifconfig br0 10.10.20.1/24 up

然後 /var/lib/lxc/my1stcontainer/config:

# Template used to create this container: /usr/share/lxc/templates/lxc-debian
# Parameters passed to the template:
# For additional config options, please look at lxc.container.conf(5)
#lxc.network.type = empty
lxc.rootfs = /var/lib/lxc/my1stcontainer/rootfs

# Common configuration
lxc.include = /usr/share/lxc/config/debian.common.conf

# Container specific configuration
lxc.mount = /var/lib/lxc/my1stcontainer/fstab
lxc.utsname = my1stcontainer
lxc.arch = amd64
lxc.autodev = 1
lxc.kmsg = 0


lxc.network.type = veth
lxc.network.link = br0
lxc.network.flags = up
lxc.network.ipv4 = 10.10.20.10/24
lxc.network.ipv4.gateway = 10.10.20.1

lxc 的 /etc/network/interfaces:

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 10.10.20.10
netmask 255.255.255.0
gateway 10.10.20.1
nameserver 10.244.128.5

奇怪的是 lxc 裡的 network/interfaces gateway, nameserver 好像沒五有用。default gateway 要設在 /var/lib/lxc/xxx/config 裡才行。
nameserver 沒有辦法設在 config，所以目前無解。

這樣設定後， host 加上 nat，lxc 就出的去了...

了解了，要是在 /var/lib/lxc/my1stcontainer/config 裡面設 ipv4 address, netmask. gateway 等等。
在 my1stcontainer 裡的 /etc/network/interfaces 的 ipaddress, netmask, gateway, dns-nameserver 等設定都會被忽略。
所以 /etc/resolv.conf 就不會依照 interfaces 的內容 update, ..

所以.. /var/lib/lxc/my1stcontainer/config 只要設定基本的就好...

lxc.network.type = veth
lxc.network.link = lxcbr0
lxc.network.flags = up

然後在 my1stcontainer 裡的 /etc/network/interfaces 就可以設得完整一點...

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 10.10.20.10
netmask 255.255.255.0
gateway 10.10.20.1
network 10.10.20.0
broadcast 10.10.20.25
dns-nameservers 10.244.128.5 10.244.128.6

至於手動啟動 br0 部份，也可以改在 host 的 /etc/network/interfaces 裡...

auto lxcbr0
iface lxcbr0 inet static
   address 10.10.20.1
   netmask 255.255.255.0
   bridge_ports dummy0

nat, masquerade...

How IP Masquerade Works
說得非常清楚呀...
第一就說，要是個 gateway，這樣才會有轉發的功能，其他的機器才會藉由他轉發。

然後，masquerade 的工作就是把所有出去的封包，重新找一個 port 給他 (所以只有 tcp 能用)，同時換掉他的 source ip，把 private 的換成自己的(output 的，public 的)。
然後把這格 port 記起剌，紀錄他原來的 ip (private ip) 和 port。
之後，只要這個 port 收到的封包，就依照當初紀錄的內容，把 dest ip 和 port 換掉。換回 private ip 和 port，再送回去。

大概是因為，這格動作是雙向的，所以在 nat masquerade rule 上只需要列一條：是從那一個 interface (ip) 出去的，要做 masquerade，
這樣自然就包含把收到的換回原來的動作。不用幫收到的再寫一條。

iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

封包只有在出去的時候做就可以了，所以是 POSTROUTING.

...如果是本機的 output 經過 postrouting, 做 masquerade 的話，ip 就一樣，只有 port 會被改，大概就連 port 也沒改了。

這個 rule 大概就可以讓其他的 ip 出去，不需要加 filter table 的 FORWARD rule

測試一下...
先記一下 reset 的 command: flush

iptables -t nat --flush

list rule..

iptables -t nat --list

恩，真的，只要一個 nat, postrouting, masquerade rule 就可以了。

2017/5/17

4.4 build fail

Compiling SDK Stubs: out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes.jar
rm -rf out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes
mkdir -p out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes
find out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/src -name "*.java" > \
        out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/java-source-list
javac -J-Xmx512M -target 1.7 -Xmaxerrs 9999999 -encoding ascii -bootclasspath "" \
   -g -Xlint:unchecked \
   -extdirs "" -d out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes \
   \@out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/java-source-list \
  || ( rm -rf out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/classes ; exit 41 )
out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates/src/android/telephony/gsm/SmsMessage.java:3: error: modifier static not allowed here
public static class SmsMessage
              ^

手動....

packages/apps/Gallery2/src/com/android/gallery3d/util/LinkedNode.java:59: error: mNext has private access in LinkedNode
            return (T) (node.mNext == mHead ? null : node.mNext);
                            ^
packages/apps/Gallery2/src/com/android/gallery3d/util/LinkedNode.java:59: error: mNext has private access in LinkedNode
            return (T) (node.mNext == mHead ? null : node.mNext);
                                                         ^
packages/apps/Gallery2/src/com/android/gallery3d/util/LinkedNode.java:63: error: mPrev has private access in LinkedNode
            return (T) (node.mPrev == mHead ? null : node.mPrev);
                            ^
packages/apps/Gallery2/src/com/android/gallery3d/util/LinkedNode.java:63: error: mPrev has private access in LinkedNode
            return (T) (node.mPrev == mHead ? null : node.mPrev);
                                                         ^

依照說明，把 private comment 掉...

target Dex: telephony-common
out/host/linux-x86/bin/dx -JXms16M -JXmx2048M --dex --output=out/target/common/obj/JAVA_LIBRARIES/telephony-common_intermediates/classes-with-local.dex     out/target/common/obj/JAVA_LIBRARIES/telephony-common_intermediates/noproguard.classes.jar

UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dex.util.ExceptionWithContext
 at com.android.dex.util.ExceptionWithContext.withContext(ExceptionWithContext.java:45)
 at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:371)
 at com.android.dx.dex.cf.CfTranslator.translate0(CfTranslator.java:139)
 at com.android.dx.dex.cf.CfTranslator.translate(CfTranslator.java:94)
 at com.android.dx.command.dexer.Main.processClass(Main.java:682)
 at com.android.dx.command.dexer.Main.processFileBytes(Main.java:634)
 at com.android.dx.command.dexer.Main.access$600(Main.java:78)
 at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:572)
 at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
 at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
 at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
 at com.android.dx.command.dexer.Main.processOne(Main.java:596)
 at com.android.dx.command.dexer.Main.processAllFiles(Main.java:498)
 at com.android.dx.command.dexer.Main.runMonoDex(Main.java:264)
 at com.android.dx.command.dexer.Main.run(Main.java:230)
 at com.android.dx.command.dexer.Main.main(Main.java:199)
 at com.android.dx.command.Main.main(Main.java:103)
Caused by: java.lang.NullPointerException
 at com.android.dx.cf.code.ConcreteMethod.(ConcreteMethod.java:87)
 at com.android.dx.cf.code.ConcreteMethod.(ConcreteMethod.java:75)
 at com.android.dx.dex.cf.CfTranslator.processMethods(CfTranslator.java:273)
 ... 15 more
...while processing  (Lcom/android/internal/telephony/gsm/GSMPhone;)V
...while processing com/android/internal/telephony/gsm/GSMPhone$1.class

1 error; aborting
make: *** [out/target/common/obj/JAVA_LIBRARIES/telephony-common_intermediates/classes-with-local.dex] Error 1

2017/5/15

assign weaker access privileges

所以順便看一下 "assign weaker access privileges"..

結果是overwrite parent class 時，使用了比較 weak 的 scope 宣告。

然後 strong.... weak 的順序是...
public -- protected -- default -- private

也就是說...繼承的class 可以開放 parent class 的內容，但是不能限縮 parent 囉...

ref: https://javadevelopersguide.blogspot.tw/2013/07/attempting-to-assign-weaker-access.html

舊版 android (2.3) 使用openjdk..

build 的時候，出現 Error:

cts/apps/CtsVerifier/src/com/android/cts/verifier/PassFailButtons.java:191: 
onCreateDialog(int,android.os.Bundle) in android.app.Activity cannot implement onCreateDialog(int,android.os.Bundle) 
in com.android.cts.verifier.PassFailButtons.PassFailActivity; 
attempting to assign weaker access privileges; was public
    private static <T extends android.app.Activity & PassFailActivity>
                    ^
1 error
m

所以..參考4.4 的...

diff --git a/apps/CtsVerifier/src/com/android/cts/verifier/PassFailButtons.java b/apps/CtsVerifier/src/com/android/cts/verifier/PassFailButtons.java
index 9991b9d..9bd0665 100644
--- a/apps/CtsVerifier/src/com/android/cts/verifier/PassFailButtons.java
+++ b/apps/CtsVerifier/src/com/android/cts/verifier/PassFailButtons.java
@@ -76,8 +76,6 @@ public class PassFailButtons {
 
         Button getPassButton();
 
-        /* Added to the interface just to make sure it isn't forgotten in the implementations. */
-        Dialog onCreateDialog(int id, Bundle args);
 
         /**
          * Returns a unique identifier for the test.  Usually, this is just the class name.

2017/5/10

repo 超慢

到 android 6 之後，repo 的操作超慢，還是 local mirror ..

所以測試一下..

另外 mirro 一次，但是只有sync 需要的 branch.. depth 也只有 10

repo init ....... --depth=10
sync -c

這個 .repo 約 35G.完整的是 45G
好像差異不大，但是 repo status.

2017/5/9

Flutter ..

Fushia 竟然有 UI 了，果然是 javascript...
所以來試一下 google 的 Flutter

2017/5/3

關閉 selinux

系統啟動後要關閉 selinux, 可以在 kernel bootcmd 中加上...
但是有時候bootcmd 無法更動。只能改在system. root 上。
就是在 init.rc 中加上 setenforce 0

但是要注意，這個command 本身也受到 selinux 的限制，
所以要把 init 的 setenforce 的 permission 打開。

打開 init 的 setenforce，要修改 android/device/--/sepolicy 下的 common/init_shell.te

加上 
allow init_shell selinuxfs:file rw_file_perms;
allow init_shell kernel:security setenforce;

Android device as a receiver for A2DP profile

http://stackoverflow.com/questions/27763756/android-device-as-a-receiver-for-a2dp-profile

Since Android L the BlueDriod stack does support A2DP sink, but it is disabled by default.

To enable it do the following:

/* Enable bluetooth av sink. */
#define BTA_AV_SINK_INCLUDED TRUE
in /external/bluetooth/bluedroid/include/bt_target.h. This enables sink support in the bluetooth stack.

Also you have to do this change:


true
in /packages/apps/Bluetooth/res/values/config.xml. This enables the particular UI.

Now you can pair your devices and start streaming. 
Unfortunately you will hear no sound although you'll receive the packets. 
The reason is that there is no audio route for A2DP sink. 
In the commit message of this patch https://android-review.googlesource.com/#/c/98161/ you can find a sample implementation on how to fix this.

Here is a list of these changes:

https://android-review.googlesource.com/#/c/97832/
https://android-review.googlesource.com/#/c/97853/
https://android-review.googlesource.com/#/c/97833/
https://android-review.googlesource.com/#/c/98130/
https://android-review.googlesource.com/#/c/98131/

2017/5/2

    public void onActionClicked(Action action) {
        switch (action.getId()) {
            case ACTION_RESET_DEVICE:
                if (!ActivityManager.isUserAMonkey()) {
                    Intent resetIntent = new Intent("android.intent.action.MASTER_CLEAR");
                    if (getIntent().getBooleanExtra(SHUTDOWN_INTENT_EXTRA, false)) {
                        resetIntent.putExtra(SHUTDOWN_INTENT_EXTRA, true);
                    }
                    sendBroadcast(resetIntent);
                }
                break;

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