mjaron-fakeuname

Fake version of Linux uname() function. Allows replacing the result of Linux uname -a and Python os.uname commands. Impacts the yum package manager to select packages architecture.

Note

Use linux setarch command instead of such custom tools, e.g: setarch i686.

Integration

All steps in one:

curl -L -o mjaron-fakeuname-all.c https://github.com/mjfryc/mjaron-fakeuname/releases/download/v0.0.5/mjaron-fakeuname-all.c &&
  gcc -c -Wall -Werror -fpic mjaron-fakeuname-all.c && gcc -shared -o libmjaron-fakeuname.so mjaron-fakeuname-all.o  &&
  export LD_PRELOAD=$(pwd)/libmjaron-fakeuname.so

Detailed steps:

• Download the release source code file:

  curl -L -o mjaron-fakeuname-all.c https://github.com/mjfryc/mjaron-fakeuname/releases/download/v0.0.5/mjaron-fakeuname-all.c

• Compile the code - make shared library:

  gcc -c -Wall -Werror -fpic mjaron-fakeuname-all.c && gcc -shared -o libmjaron-fakeuname.so mjaron-fakeuname-all.o

• Configure and override the system library:

  export LD_PRELOAD=$(pwd)/libmjaron-fakeuname.so

Usage examples

env MJARON_FAKEUNAME_PRESET=i686 uname -a

or:

env MJARON_FAKEUNAME_MACHINE=i686 uname -a

or:

export MJARON_FAKEUNAME_CONF=/etc/mjaron-fakenode.conf
/etc/mjaron-fakenode.conf # ...Edit the conf...
uname -a

Alternative confuguration ways

The library does the following:

1. Check if MJARON_FAKEUNAME_PRESET is set to use predefined values.
   • Currently only i686 value is defined which simulates 32-bit operating system.
2. Look for the contiguration file at:
   • MJARON_FAKEUNAME_CONF environment variable if set.
   • /etc/mjaron-fakeuname.conf by default, if exists.
3. Look for indifivual values and override above configuration:
   • MJARON_FAKEUNAME_MACHINE - changes the machine value.

The configuration file

The default location of configration file is /etc/mjaron-fakeuname.conf and may be changed with export MJARON_FAKEUNAME_CONF=....

Current computer configuration may be generated with mjaron-fakeuname-conf.sh, e.g:

./mjaron-fakeuname-conf.sh 

sysname: GNU/Linux
nodename: hostname
release: 6.8.0-48-generic
version: #48-Ubuntu SMP PREEMPT_DYNAMIC Fri Sep 27 14:04:52 UTC 2024
machine: x86_64