Editing Back up your applications

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Let us suppose that you are using a very special application. It may be possible that after a long time of use, the repository from where you downloaded your application is not available any more. It may also be possible that, after a long use, something happened to your device, and you need to reinstall your favorite application.  
Let us suppose that you are using a very special application. It may be possible that after a long time of use, the repository from where you downloaded your application is not available any more. It may also be possible that, after a long use, something happened to your device, and you need to reinstall your favorite application.  
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We are going to explain you a way to keep a copy of the DEB package of your favorite application, so that you can install it again even if the package is not available any more from the repositories.
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I am going to explain you a way to keep a copy of the DEB package of your favorite application, so that you can install it again even if the package is not available any more from the repositories.
WARNING: Downloading deb files for all the installed packages may cause the root file-system to be exhausted thereby "bricking" the device. Proceed with caution.
WARNING: Downloading deb files for all the installed packages may cause the root file-system to be exhausted thereby "bricking" the device. Proceed with caution.
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== Needed Tools and Skills ==
== Needed Tools and Skills ==
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To follow this tutorial, you need root access on your device and the following tools:
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To follow this tutorial, you need some tools and skills. You need:
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*Terminal emulator (X Terminal or SSH)
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*Terminal emulator
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*VIM editor (Available in [[Extras]])
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*Root access
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*VI editor
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== Create the Archive folder ==
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== First Step ==
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* Open a terminal emulator and create the required folders using the following command:
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<pre>
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*Open a terminal emulator
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$ mkdir /home/user/MyDocs/apt-archive-cache
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*As a normal user type the following command:
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$ mkdir /home/user/MyDocs/apt-archive-cache/archives
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:<pre>$ dpkg --get-selections|grep install|grep -v deinstall>/home/user/package.list
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$ mkdir /home/user/MyDocs/apt-archive-cache/archives/partial
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</pre>
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or the equivalent
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<pre>
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$ mkdir -p /home/user/MyDocs/apt-archive-cache/archives/partial
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</pre>
</pre>
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If you wish to use a different folder, substitute /home/user/MyDocs with the desired path.
 
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== Create Package-List ==
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== Second Step ==
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*As a normal user type the following command to create a file (package.list) that contains a list of all the packages installed on the device:
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After the previous step, you will have a list with all packages installed on your device.
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<pre>$ dpkg --get-selections|grep install|grep -v deinstall>/home/user/package.list
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</pre>
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In case you just want to download a selection of packages from that list, you should edit it and remove the lines you do not need.
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In case you just want to download some packages of that list, you should edit it and remove the lines you do not need.  
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For example, if you just want to download a copy of the package ''abiword'', then you should:
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I am going to show you an easy way to do that. Let us suppose that you just want to download a copy of the package ''abiword'', then you should:
*As a normal user type the following command:
*As a normal user type the following command:
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<pre>$ cat /home/user/package.list|grep abiword>/home/user/package-abiword.list</pre>
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<pre>$ cat /home/user/package.list|grep abiword>package-abiword.list</pre>
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If you want to download all packages, except one of them: ''debconf'', for example. Then you should:
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Let us suppose that you want to download all packages, except one of them: ''debconf'', for example. Then you should:
*As a normal user type the following command:
*As a normal user type the following command:
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<pre>$ cat /home/user/package.list|grep -v debconf>/home/user/package-without-debconf.list</pre>
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<pre>$ cat /home/user/package.list|grep -v debconf>package-without-debconf.list</pre>
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== Edit Package-List ==
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== Third (and Last) Step ==
After previous steps, you have a list with all the desired packages you want to download to your device. In our previous examples this list could be any one of these:
After previous steps, you have a list with all the desired packages you want to download to your device. In our previous examples this list could be any one of these:
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Now you just need to edit this list in order to use it with ''apt-get'':
Now you just need to edit this list in order to use it with ''apt-get'':
*As a normal user type the following command:
*As a normal user type the following command:
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<pre>$ vim /home/user/package.list </pre>
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<pre>$ vi /home/user/package.list </pre>
*After ''vi'' editor is running, then type the following command:
*After ''vi'' editor is running, then type the following command:
<pre> :%s!install!! </pre>
<pre> :%s!install!! </pre>
*This last command will clean the lines, removing the word ''install'' and leaving just the name of the packages. Now we want to add an order for ''apt-get'' to download the desired packages, so type the following command:
*This last command will clean the lines, removing the word ''install'' and leaving just the name of the packages. Now we want to add an order for ''apt-get'' to download the desired packages, so type the following command:
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<pre> :%s!^!apt-get --force-yes -yy -d install --reinstall -o dir::cache=/home/user/MyDocs/apt-archive-cache ! </pre>
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<pre> :%s!^!apt-get --force-yes -yy -d install --reinstall ! </pre>
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*This last command will add to the beginning of each line the needed instructions for ''apt-get'' to only download the packages: ''-d install --reinstall''. In order to prevent the script from stopping at any question we have inserted the ''--force-yes -yy'' option. Now we just need to save the file typing the following command:
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*This last command will add to the beginning of each line the needed instructions for ''apt-get'' to only download the packages: ''-d install --reinstall''. To prevent the script from stopping at any question we have inserted the ''--force-yes -yy'' option. Now we just need to save the file typing the following command:
<pre> ZZ </pre>
<pre> ZZ </pre>
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== Download Packages ==
 
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Executing the package-list script will download the packages.
 
*To execute the script we need first to get ROOT access.
*To execute the script we need first to get ROOT access.
*Then as ROOT type the following command:
*Then as ROOT type the following command:
<pre> # sh</home/user/package.list </pre>
<pre> # sh</home/user/package.list </pre>
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You should now see the downloads in progress.  
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It is done. All desired packages have been downloaded and can be listed with the following command:
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<pre>
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<pre>$ ls /var/cache/apt/archives|grep deb </pre>
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Reading package lists... Done
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Building dependency tree     
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Reading state information... Done
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0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
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Need to get 213kB of archives.
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After this operation, 0B of additional disk space will be used.
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Get:1 http://repository.maemo.org fremantle/free 100boxes 0.5.0-4 [213kB]
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Fetched 213kB in 0s (538kB/s)
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Download complete and in download only mode
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</pre>
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Depending on the size of the list, this could take a long time. After it is completed, the downloaded packages can be listed with the following command:
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<pre>$ ls /home/user/MyDocs/apt-archive-cache/archives|grep deb
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Nokia-N900-42-11:/home/user# ls /home/user/MyDocs/apt-archive-cache/archives|grep deb
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100boxes_0.5.0-4_armel.deb
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accdisplay_1.0_armel.deb
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adblock-plus-1.0_1maemo0-8_all.deb
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ati85_1.4.1-1_armel.deb
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battlegweled_0.9-4_armel.deb
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bluetooth-dun_1.0-2_armel.deb
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</pre>
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== Install Package-List ==
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With previous steps you have downloaded all your favourite applications, for backup purposes. Now just imagine that you need to install them again from scratch, then you will need to proceed as follows:
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To install all the packages from the list:
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* open the package.list file in VIM
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* remove the -d option from each of the lines (:%s!-d!!)
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* save and execute the file again as root (# sh</home/user/package.list)
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If you wish to install an individual package, execute the apt-get command separately for that package by using the specific line from the packages.list file.
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<pre>
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Nokia-N900-42-11:/home/user# apt-get --force-yes -yy  install --reinstall -o dir::cache=/home/user/MyDocs/apt-archive-cache 100boxes 
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Reading package lists... Done
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Building dependency tree     
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Reading state information... Done
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0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
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Need to get 0B/213kB of archives.
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After this operation, 0B of additional disk space will be used.
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(Reading database ... 36360 files and directories currently installed.)
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Preparing to replace 100boxes 0.5.0-4 (using .../100boxes_0.5.0-4_armel.deb) ...
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Unpacking replacement 100boxes ...
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Setting up 100boxes (0.5.0-4) ...
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</pre>
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== Dependencies ==
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* executing package.list will only download the package, not the dependencies. This may create problems during restore when the package dependencies are not available in the archive. Of course, this would only be a problem if the package list was a selection of the entire system package list. When downloading the entire system package list, all packages would be available and dependecies would not be an issue.
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* safe way would be to remove the application via 'apt-get remove' and 'apt-get autoremove' and then use the apt-get with the -d and -o option to download the package with the dependencies.
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== Further Questions ==
== Further Questions ==
If you have further questions, do not hesitate to place the question here in this section, and it will be answered in short.
If you have further questions, do not hesitate to place the question here in this section, and it will be answered in short.
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You may also ask for help sending me an [mailto:n900@academia-online.org e-mail]
 
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[[Category:Power users]]
 
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[[Category:HowTo]]
 

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