Monthly Archives: September 2012

Remote SVN backup with svnsync

07.09.2012 – 01:50

Create local svn repository with name “my_local_repo”

$ svnadmin create my_local_repo

1	$ svnadmin create my_local_repo

prepare local repo

$ echo "#!/bin/sh" > hooks/pre-revprop-change
$ chmod 755 hooks/pre-revprop-change

1 2	$ echo "#!/bin/sh" > hooks/pre-revprop-change $ chmod 755 hooks/pre-revprop-change

initialize local copy

$ svnsync init file:///path/to/my_local_repo http://from.server/from_repo

1	$ svnsync init file:///path/to/my_local_repo http://from.server/from_repo

first run must be interactive to input and save your login and password

svnsync sync file:///path/to/my_local_repo

1	svnsync sync file:///path/to/my_local_repo

write script to run it in cron
backup_svn_script.sh:

#!/bin/bash
svnsync --non-interactive sync file:///path/to/my_local_repo
tar -C /path/to/ -czf /path/to/backup/$(date +"svn_%Y_%m_%d_%H_%M_%S").tar.gz my_local_repo

#!/bin/bash

svnsync --non-interactive sync file:///path/to/my_local_repo

tar -C /path/to/ -czf /path/to/backup/$(date +"svn_%Y_%m_%d_%H_%M_%S").tar.gz my_local_repo

it produce files like “svn_2012_09_07_01_34_01.tar.gz” in your backup directory

Now you can add task to cron. Execute:

$ crontab -e

1	$ crontab -e

and add following line to run backup at 4:00 (4 a.m.) every day

0 4 * * * /path/to/backup_svn_script.sh

1	0 4 * * * /path/to/backup_svn_script.sh

This method is not disk space efficient, but very simple.

Sources:
using svnsync
installing subversion server in ubuntu

Yuriy Nazarov | Permalink | Comment (0)

bash linux

Web server on bash

04.09.2012 – 00:17

web server on bash, nc, awk and sed

#!/bin/sh
rm /tmp/f
mkfifo /tmp/f
#runloop
while true
do
	nc -l 8080 < /tmp/f | (
	#read request
	read line

	#parse request
	args=$(echo -n "$line" | awk '{print $2}' | sed s~'?'~' '~ | awk '{print $2}')
	page=$(echo -n "$line" | awk '{print $2}' | sed s~'?'~' '~ | awk '{print $1}' | sed s~'/'~''~)
	user=$(echo -n "$args" | sed s~','~"\n"~ | sed s~'='~' '~ | awk '{if($1 == "user") print $2}')

	#some logic
	if [ "$page" != 'index.sh' ]
	then
		conttype="application/octet-stream"
		len=$(stat -c%s $page)
		echo "HTTP/1.0 200 OK"
		echo "Server: MadnessBASH"
		echo "Content-Length: $len"
		echo "Content-Type: $conttype"
		echo ""
		cat $page

	else
		conttype="text/html"

		if [ -z "$user" ]
		then
			data=`cat login.htm`
		else
			data=`cat index.htm`
			data=$(echo -n "$data" | sed s~_user_~"$user"~)
		fi
		len=`echo $data | wc -c`

		echo "HTTP/1.0 200 OK"
		echo "Server: MadnessBASH"
		echo "Content-Length: $len"
		echo "Content-Type: $conttype"
		echo ""
		echo $data
	fi

) > /tmp/f
done

#!/bin/sh

rm /tmp/f

mkfifo /tmp/f

#runloop

while true

nc -l 8080 < /tmp/f | (

#read request

read line

#parse request

args=$(echo -n "$line" | awk '{print $2}' | sed s~'?'~' '~ | awk '{print $2}')

page=$(echo -n "$line" | awk '{print $2}' | sed s~'?'~' '~ | awk '{print $1}' | sed s~'/'~''~)

user=$(echo -n "$args" | sed s~','~"\n"~ | sed s~'='~' '~ | awk '{if($1 == "user") print $2}')

#some logic

if [ "$page" != 'index.sh' ]

then

conttype="application/octet-stream"

len=$(stat -c%s $page)

echo "HTTP/1.0 200 OK"

echo "Server: MadnessBASH"

echo "Content-Length: $len"

echo "Content-Type: $conttype"

echo ""

cat $page

else

conttype="text/html"

if [ -z "$user" ]

then

data=`cat login.htm`

else

data=`cat index.htm`

data=$(echo -n "$data" | sed s~_user_~"$user"~)

len=`echo $data | wc -c`

echo "HTTP/1.0 200 OK"

echo "Server: MadnessBASH"

echo "Content-Length: $len"

echo "Content-Type: $conttype"

echo ""

echo $data

) > /tmp/f

done

Yuriy Nazarov | Permalink | Comment (0)

linux

Remote access without “white” ip

03.09.2012 – 00:19

How to get access to shell on the remote computer that don’t have “white”(“real” or “public”) IP without any additional software in linux?
Quick and dirty solution:
on server side:

mkfifo /tmp/p0.0
mkfifo /tmp/p0.1
screen sh -c 'cat < /tmp/p0.1 & cat > /tmp/p0.0'
#now you can detach this from current console and attach it back when you want it

mkfifo /tmp/p0.0

mkfifo /tmp/p0.1

screen sh -c 'cat < /tmp/p0.1 & cat > /tmp/p0.0'

#now you can detach this from current console and attach it back when you want it

on client side:

mkfifo /tmp/localpipe
ssh -p 22 my.host.name 'cat < /tmp/p0.0 & cat > /tmp/p0.1' < /tmp/localpipe | bash > /tmp/localpipe

1 2	mkfifo /tmp/localpipe ssh -p 22 my.host.name 'cat < /tmp/p0.0 & cat > /tmp/p0.1' < /tmp/localpipe \| bash > /tmp/localpipe

pipe ‘/tmp/localpipe’ used to redirect bash output back to ssh
note: use exit command to stop redirection

Yuriy Nazarov | Permalink | Comments (2)

From idea to profit

Monthly Archives: September 2012

Remote SVN backup with svnsync

Web server on bash

Remote access without “white” ip

Recent Posts

Meta

Categories

Archives