debugging FUSE application

See also questions close to this topic

• Linux on Lightsail instance is asking for a password and it's not working

  I'm trying to restart mariaDB on Ubuntu but it's not letting me.

  I enter:

  systemctl restart mariadb
  

  and get:

  ==== AUTHENTICATING FOR org.freedesktop.systemd1.manage-units ===
  
  Authentication is required to restart 'mariadb.service'.
  
  Authenticating as: Ubuntu (ubuntu)
  
  Password: 
  
  polkit-agent-helper-1: pam_authenticate failed: Authentication failure
  
  ==== AUTHENTICATION FAILED ===
  

  I have the same password for all functions so I do not understand why it is not working. What can I do?
• How to tag and store files, by metadata, in Python?

  I want to build a manual file tagging system like this. Given that a folder contains these files:

  data/
      budget.xls
      world_building_budget.txt
  a.txt
  b.exe
  hello_world.dat
  world_builder.spec
  

  I want to write a tagging system where executing

  py -3 tag_tool.py -filter=world -tag="World-Building Tool"

  will output

  These files were tagged with "World-Building Tool":
      data/world_building_budget.txt
      hello_world.dat
      world_builder.spec
  

  Another example. If I execute:

  py -3 tag_tool.py -filter="\.txt" -add_tag="Human Readable"

  It will output

  These files were tagged with "Human Readable":
      data/world_building_budget.txt
      a.txt
  

  I am not asking "Do my homework for me". I want to know what approach I can take to build something this? What data structure should I use? How should I tag contents in a directory?
• Installing pillow fails on Linux environment or Chrome OS. How do I fix this?

  When I try to install pillow with pip3, it gives me the following error message.

  failed building wheel for pillow

  [omitted text]

  Command "/usr/bin/python3 -u -c "import setuptools, tokenize;file='/tmp/pip-install-092vzzoo/pillow/setup.py';f=getattr(tokenize, 'open', open)(file);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, file, 'exec'))" install --record /tmp/pip-record-v4rw5g1c/install-record.txt --single-version-externally-managed --compile --user --prefix=" failed with error code 1 in /tmp/pip-install-092vzzoo/pillow/
• How to manually postprocess CMake target during installation?

  I am working on a library that provides gdb pretty-printers. They could be automatically located by including the .debug_gdb_scripts section in the generated binary. For binaries inside build, I would like this section to point to the pretty-printer inside the source tree. For installed binaries, I would like to either strip this specific section only, or install the pretty-printer as well and change the reference to its installed location.

  Is there builtin functionality in CMake or a simple solution to postprocess the installed binary?
• When intel pin instrument one elf file, I can't find the pin's process. Why?

  Today, I want to debug the pintool with the gdb(instead of the program to instrument). With the gdb, we can debug the running process using the "attach" command in the gdb. I found out when I start the pin, but I can't find the process of the pin. I only can find the process of the elf program to the instrument. This is what I found when I run the pin tool.

  USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
  root      6550  110  0.6 131472 13216 pts/0    R+   15:45   0:06 obj- 
  intel64/mini_test.exe cur_input
  root      6557 32.6  0.0      0     0 ?        I    15:45   0:01 [kworker/u6:4]
  

  The mini_test.exe is the program for the instrument. I searched some materials, it tells me that the intel pin would be attached to the process to instrument. If in this case, How to debug the pintools?
• Put a breakpoint in shared library with GEF GDB

  I want to put a breakpoint in a Linux share library in specific offset ( in libTest.so in function 0x1234 ) while I debugging with GEF GDB. But I want to put it with gdb script.

  If I run vmmap libTest.so I got

  [ Legend:  Code | Heap | Stack ]
  Start  End    Offset Perm Path
  0x00000012a1XXX 0x00000012a3XXX 0x00000000000000 r-x /lib/libTest.so
  0x00000012a3XXX 0x00000012a5XXX 0x000000000XXXX --- /lib/libTest.so
  0x00000012aXXXX 0x00000012aXXXX 0x000000000XXXX r-- /lib/libTest.so
  0x00000012aXXXX 0x00000012aXXXX 0x000000000XXXX rw- /lib/libTest.so
  

  So the first line is where the code located. So I want to put a breakpoint in 0x00000012a1XXX+0x1234 For now I put that code in GDB script

  python 
  str = gdb.execute('vmmap  libTest.so', False, True)
  addr_base= (str.split('\n')[2].split(' ')[0])
  gdb.execute('b '+addr_base+0x1234)
  end
  

  But that is bad code. Is there any simple way?
• Read-only file system in link2sd

  I'm trying to move obb to sdcard in my android 11 using link2sd but when I open link2sd it shows me this:[https://i.stack.imgur.com/KenTA.jpg][1] That my android is using sdcardfs and the solution is replacing system/bin/sdcard by sdcard from SDK android image And when I press OK it shows me this:[https://i.stack.imgur.com/bVQhT.jpg][1] That the app can't create or reblace system/bin/sdcard system file read-only I've tried power mount and other apps to do this but none worked because of this problem what can I do?
• modprobe: FATAL: Module fuse not found in directory

  I am trying to mount a remote dir onto my local machine using sshfs. My local is running Ubuntu 20.04. When I try:

  sudo modprobe fuse
  

  I get:

  modprobe: FATAL: Module fuse not found in directory /lib/modules/5.4.162-1-pve
  

  Fuse (2.9.9-3) is installed on my local machine. The /lib path does not hold a modules/ directory.

  How can I make modprobe to work ?

  EDIT: The remote machine is a LXC (linux container). That explains why modprobe does not work. Closing question here.