Simple universal package installer (SUPI !) script

rng · 12-11-2015, 08:12 AM

Following script extracts files from packages (rpm, txz, tgz, deb or arch) and creates 2 scripts: copier.sh and remover.sh, which can then be run as root to copy all the files into the system, or remove them from the system. One can keep a set of packages (may be of different types) in a folder, cd to that folder, give command 'supi *' to create copier.sh and remover.sh. They only copy and remove the files and do not run any pre or post-install commands.

Code:

#! /bin/bash
# USAGE MESSAGE IF NO PACKAGE NAME: 
if [ -z $1 ]
then
  echo "USAGE: supi <packagename>"
  exit
fi
mkdir supitemp 

# EXTRACT EACH FILE: 
for FILE1 in "$@"
do
echo $FILE1 | awk ' /.rpm$/{ system("cp " $FILE1 " supitemp; cd supitemp; rpm2cpio " $FILE1 " | cpio -idvm; rm " $FILE1 "; cd ..")}'
echo $FILE1 | awk ' /.txz$/{ system("tar -Jxvf " $FILE1 " -C supitemp")}' 
echo $FILE1 | awk ' /.tgz$/{ system("tar -xvzf " $FILE1 " -C supitemp")}' 
echo $FILE1 | awk ' /.pkg.tar.xz$/{ system("tar -Jxvf " $FILE1 " -C supitemp")}'
echo $FILE1 | awk ' /.deb$/{ system("ar x " $FILE1 "; tar -Jxvf data.tar.xz -C supitemp; tar -zxvf data.tar.gz -C supitemp; rm data.tar.xz data.tar.gz control.tar.gz debian-binary")}'
done

# FIND FILES, LINKS AND NEW DIRECTORIES TO BE CREATED: 
find ./supitemp -type f > /tmp/filelist
find ./supitemp -type l >> /tmp/filelist
find ./supitemp -type d | awk ' { if ( system(" [ -d " substr($1,11) " ] ")  ) print $1 } ' > /tmp/newdirlist

# CREATE COPIER.SH
echo "#! /bin/bash" > copier.sh
cat /tmp/newdirlist | awk ' {print "mkdir -v ",substr($1,11)} ' >> copier.sh 
cat /tmp/filelist | awk ' {print "cp -vip ",$1," ",substr($1,11)} ' >> copier.sh

# CREATE REMOVER.SH
echo "#! /bin/bash" > remover.sh
cat /tmp/filelist | awk ' {print "rm -v ",substr($1,11)} ' >> remover.sh
tac /tmp/newdirlist | awk ' {print "rmdir -v ",substr($1, 11)} ' >> remover.sh 

# MAKE THEM EXECUTABLE: 
chmod +x copier.sh
chmod +x remover.sh

This is obviously not a desirable way to install packages (which is to install from one's own repository, using native package manager) but it can be used to test foreign packages that are not available for one's own distribution. Are there any code errors in this script?

berndbausch · 12-12-2015, 01:40 AM

A nice little project of more than trivial complexity. Well done!

I am sure there are errors, since there is no software without errors. I suggest to test it, and if it doesn't behave as expected, ask specific questions.

For now, let me point out a few areas that can be improved:

The four awk statements under EXTRACT FILES are inefficient and awkward (pun intended). This is handled much better with a shell case statement.
Or at least call awk once instead of four times. Awk has been designed to handle more than one case.

cat somefile | awk '...' is known as cat abuse (check it out on wikipedia). Just run awk '...' somefile.

Rather than using awk to remove the string "./supitemp" from file and directory names, don't generate that string in the first place. I.e., instead of find ./supitemp, run cd supitemp; find .; cd -.

Also check out the links in my signature. I am sure others will chime in with more suggestions.

rng · 12-12-2015, 05:52 AM

I will try to implement your suggestions.