trafficpixels Blog

Tue 2021-12-14

• Start system using kvm

  
  qemu-system-x86_64 -m 2048 -boot d -enable-kvm -smp 3 -net nic -net user -cdrom Bliss-v11.13--OFFICIAL-20201113-1525_x86_64_k-k4.19.122-ax86-ga-rmi_m-20.1.0-llvm90_dgc-t3_g.iso
  
  you might need to enable virtualization first
  
  1. sudo apt install qemu-system-x86
  2. sudo apt install qemu-system-gui
  3. sudo apt install cpu-checker
  4. cpu-ok
  5. sudo modprobe kvm
  6. sudo modprobe kvm_intel
  7. maybe you need to enable virtualization in the BIOS or UEFI

Sun 2021-12-12

• Rename package name of an APK (Android application) (not yet double-checked)

  rename from mobi.omegacentaur.SendReduced to my.renamed.app
  1. java -jar apktool_2.6.0.jar d mobi.omegacentaur.SendReduced.apk
  2. rename in AndroidManifest.xml (all?) occurences of mobi.omegacentaur.SendReduced to my.renamed.app
  3. rename folder structure inside smali from mobi/omegacentaur/SendReduced to my/renamed/app
     • thanks to iBotPeaches@Github
  4. rename inside folder in all .smali files all occurences of Lmobi/omegacentaur/SendReduced to Lmy/new/app
     • thanks to iBotPeaches@Github
     find . -name '*.smali' -exec sed -i 's/Lmobi\/omegacentauri\/SendReduced/Lmy\/renamed\/app/g' {} \;
     • thanks to baeldung for showing how to rename contents across different files and programmerah.com for explaining how to use parentheses or backslashes while using find.
  5. java -jar apktool_2.6.0.jar b mobi.omegacentauri.SendReduced_2600 -o my.renamed.app.akp
  6. jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore a.apk alias_name -storepass android

• Modify an APK (Android application)

  1. Download Apktool from Bitbucket
  2. Put apk file and apktool into the same directory
  3. generate a signing key (if you do not have one)
     • keytool -genkey -v -keystore my-release-key.keystore -alias alias_name -keyalg RSA -keysize 2048 -validity 10000
  4. decompile the app
     • java -jar apktool_2.6.0.jar d mobi.omegacentauri.SendReduced-2600.apk
  5. make your modifications in the newly created folder mobi.omegacentauri.SendReduced-2600
  6. compile the app
     • java -jar apktool_2.6.0.jar b mobi.omegacentauri.SendReduced-2600 -o a.apk
  7. sign the app
  8. jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore my-release-key.keystore a.apk alias_name -storepass android

Fri 2021-12-10

• Resize a logical volume when using LVM

  1. sudo vgdisplay
  2. sudo lvdisplay
  3. df -h
  4. sudo lvextend -L+10G /dev/debian-vg/root
  5. sudo resize2fs /dev/debian-vg/root
  6. df -h
  7. sudo vgdisplay
  8. sudo lvdisplay
  thanks to Bobbin Zachariah