java - Copy Linux liveUSB causes errors with init.d scripts -

-

the overall problem

when install simple java application wrote run on boot in background through /etc/init.d/, works on liveusb explicitly install on. when make copy of stick, never boot successfully. when booting liveusb copy java application hang when liveusb boot process reaches script. script, supposed do, every 5 minutes , continue running forever until power down machine.

  1. my script blocking else
  2. nothing loads beyond script
  3. you cannot cancel script
  4. there no gui
  5. the text can see command line output script

setup & test - goes :)

i have linux liveusb 3 partitions. simple standard xubuntu image loaded.

  • sda1 > 2gb stoage
  • sda2 > 2gb system
  • sda3 > remaining gb casper

i have created simple java application runs in background on start up. far, followed these steps:

  1. compiled java application classes
  2. placed class files in /home/user/folder/
  3. copied startup.sh script /etc/init.d/
  4. while inside /etc/init.d/
    • typed "update-rc.d startup.sh start 20 2 5 . stop 20 0 1 6 ."
    • this updated run levels successfully
  5. now can restart / reboot / shutdown whatever operation , runs perfectly!

the copy - here's gets tricky!

when creating copy of stick, follow these steps:

  1. mount sda2
    • copy folder /home/user/desktop/tmp-system/
  2. mount sda3
    • copy folder /home/user/desktop/tmp-casper/
  3. go /home/user/desktop/tmp-system/
    • type "tar -cvf system.tar ."
  4. go /home/user/desktop/tmp-casper/
    • type "tar -cvf casper.tar ."
  5. umount
    • sda2
    • sda3
  6. plug in empty usb (sdb example)
    • set partitions (same stick copying from)
    • untar partitions
      • tar -xvf system.tar ... sdb2
      • tar -xvf casper.tar ... sdb3

testing - here's goes wrong!

  1. plug in newly created liveusb computer
  2. boot usb
  3. everything starts boot fine
  4. java application wrote gets triggered
    • boot process hangs forever
    • no cmd prompt available
    • no gui available
    • it if thread running (and is! output can viewed every 5 minutes - way should be)

solution attempts & gotchas

1

i can mount copied liveusb edit startup.sh not start java application , still not boot (just suspected?).

2

if use "dd if=sda of=sdb" copy of liveusb work fine. not acceptable solution. if copy 16gb stick dd 64gb stick, turn 64gb stick 16gb.

3

tested many variations of startup.sh , java application itself. of produce same error.

4

the method using copy works every other form of application, file or else.

5

i try , avoid using additional libraries or programs run java application.

what might better use method create liveusb linux stick, add java program settings , directories. here - bootable pendrive live cd

i point number 1 mention. copy liveusb without java program not work. have spent quite time debug program. have feeling interested in making many liveusb java program installed. since dd not option, guess it's more meaningful somehow use kickstart procedure quick liveusb installations , copy java things. thanks.


Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more