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migrate to book theme and merge docs from wiki
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[submodule "themes/plain"] | ||
path = themes/plain | ||
url = git@github.com:ansemjo/hugo-theme-plain.git | ||
[submodule "themes/book"] | ||
path = themes/book | ||
url = https://github.com/alex-shpak/hugo-book |
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This is [ansemjo's](https://github.com/ansemjo) small wiki. It contains all sorts of | ||
more or less useful information. | ||
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Unless otherwise noted, the content on this site is licensed under the | ||
[Creative Commons Attribution-ShareAlike 4.0](https://semjonov.de/license), | ||
which also applies to my [website](https://semjonov.de). |
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#!/usr/bin/perl | ||
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use Getopt::Std; | ||
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# | ||
# geteltorito.pl: a bootimage extractor | ||
# Script that will extract the first El Torito bootimage from a | ||
# bootable CD image | ||
# R. Krienke 08/2001 | ||
# krienke@uni-koblenz.de | ||
# License: GPL | ||
# | ||
# Get latest version from: | ||
# http://userpages.uni-koblenz.de/~krienke/ftp/noarch/geteltorito | ||
# | ||
$utilVersion="0.6"; | ||
# | ||
# Version 0.6 | ||
# 2015/02/25 | ||
# I included a patch by Daniel Kekez, daniel.kekez@utoronto.ca to make geteltorito | ||
# better compatible with windows: | ||
# "To run this Perl script using using Strawberry Perl under Windows, I | ||
# found it was necessary to explicitly open the files in binary mode since | ||
# Windows will default to text mode when open() is called." | ||
# Version 0.5 | ||
# 2009/06/22 | ||
# A patch for harddisk emulation images from <colimit@gmail.com>. | ||
# For BootMediaType=4 (harddisk emulation) SectorCount is always 1, and geteltorito.pl | ||
# returns just MBR. This patch guesses the correct bootimage size | ||
# from MBR (offset+size of the first partitition). | ||
# Version 0.4 | ||
# 2007/02/01 | ||
# A patch from Santiago Garcia <manty@debian.org> to use a virtual sector | ||
# size (vSecSize) of 512 bytes, as defined on "El Torito" specs and change | ||
# unpack of the sector count from n to v to get the correct sector count. | ||
# Version 0.3 | ||
# 2006/02/21 | ||
# A patch from Ben Collins <bcollins@ubuntu.com> to make the | ||
# utility work on PPC machines (change from 'L'-encoding in pack to 'V') | ||
# Version 0.2 | ||
# Several patches included from Nathan Stratton Treadway(nathant@ontko.com) | ||
# to adjust the platform output as well as fixes for other minor bugs | ||
# Version 0.1 | ||
# Initial release | ||
# | ||
# For information on El Torito see | ||
# http://en.wikipedia.org/wiki/El_torito | ||
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$vSecSize=512; | ||
$secSize=2048; | ||
$ret=undef;$version=undef;$opt_h=undef;$loadSegment=undef;$systemType=undef; | ||
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# | ||
# Read a particular sector from a file | ||
# sector counting starts at 0, not 1 | ||
# | ||
sub getSector{ | ||
my ($secNum, $secCount, $file)=@_; | ||
my ($sec, $count); | ||
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open(FILE, "<:raw", $file) || die "Cannot open \"$file\" \n"; | ||
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seek(FILE, $secNum*$secSize, 0); | ||
$count=read(FILE, $sec, $vSecSize*$secCount, 0) ; | ||
if( $count != $vSecSize*$secCount ){ | ||
warn "Error reading from file \"$file\"\n"; | ||
} | ||
close(FILE); | ||
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return($sec); | ||
} | ||
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# | ||
# Write eltorito data into a file | ||
# | ||
sub writeOutputFile{ | ||
my($name)=shift; | ||
my($value)=shift; | ||
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open(OUT, ">:raw", $name)|| die "$0: Cannot open outputfile \"$name\" for writing. Stop."; | ||
print OUT $value; | ||
close(OUT); | ||
} | ||
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# | ||
# Usage | ||
# | ||
sub usage{ | ||
warn "\n$0 [-hv] [-o outputfilename] cd-image \n", | ||
"Script will try to extract an El Torito image from a \n", | ||
"bootable CD (or cd-image) given by <cd-image> and write \n", | ||
"the data extracted to STDOUT or to a file.\n", | ||
" -h: This help. \n", | ||
" -v: Print version of script and exit.\n", | ||
" -o <file>: Write extracted data to file <file> instead of STDOUT.\n", | ||
"\n\n"; | ||
exit 0; | ||
} | ||
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# --------------------------------------------------------------------- | ||
$ret=getopts('hvo:'); | ||
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if( defined($opt_v) ){ | ||
warn "Version: $utilVersion \n"; | ||
exit 0; | ||
} | ||
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if( defined($opt_h) || $#ARGV <0 ){ | ||
usage(0); | ||
} | ||
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if( defined($opt_o) ){ | ||
$outputFilename="$opt_o"; | ||
} | ||
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$imageFile=$ARGV[0]; | ||
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if( ! -r $imageFile ){ | ||
die "Cannot read image/device \"$imageFile\". Aborting\n"; | ||
} | ||
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# | ||
# Read Sector 17 from CD which should contain a Boot Record Volume | ||
# descriptor. This descriptor contains at its start the text ($isoIdent) | ||
# CD001 and ($toritoSpec) | ||
# EL TORITO SPECIFICATION | ||
# see http://www.cdpage.com/Compact_Disc_Variations/eltoritoi.html | ||
# for details | ||
# | ||
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$sector=getSector(17, 1, $imageFile ); | ||
($boot, $isoIdent, $version, $toritoSpec, | ||
$unUsed, $bootP)= unpack( "Ca5CA32A32V", $sector ); | ||
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if( $isoIdent ne "CD001" || $toritoSpec ne "EL TORITO SPECIFICATION" ){ | ||
die "This data image does not seem to be a bootable CD-image\n"; | ||
} | ||
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# | ||
# Now fetch the sector of the booting catalog | ||
# | ||
$sector=getSector($bootP, 1, $imageFile ); | ||
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print STDERR "Booting catalog starts at sector: $bootP \n"; | ||
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# The first 32 bytes of this sector contains the validation entry for a | ||
# boot. The first byte has to be 01, the next byte determines the | ||
# architecture the image is designed for, where 00 is i86, 01 is PowerPC | ||
# and 02 is Mac. More data give info about manufacturer, etc. The | ||
# final two bytes must contain 0x55 and 0xAA respectively (as | ||
# defined by the El Torito standard). | ||
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$validateEntry=substr($sector, 0, 32); | ||
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($header, $platform, $unUsed, $manufact, $unUsed, $five, $aa)= | ||
unpack( "CCvA24vCC", $validateEntry); | ||
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if( $header != 1 || $five != 0x55 || $aa != 0xaa ){ | ||
die "Invalid Validation Entry on image \n"; | ||
} | ||
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print STDERR "Manufacturer of CD: $manufact\n"; | ||
print STDERR "Image architecture: "; | ||
print STDERR "x86" if( $platform == 0 ); | ||
print STDERR "PowerPC" if( $platform == 1 ); | ||
print STDERR "Mac" if( $platform == 2 ); | ||
print STDERR "unknown ($platform)" if( $platform > 2 ); | ||
print STDERR "\n"; | ||
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# | ||
# Now we examine the initial/defaultentry which follows the validate | ||
# entry and has a size of 32 bytes. | ||
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$initialEntry=substr($sector, 32, 32); | ||
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($boot, $media, $loadSegment, $systemType, $unUsed, | ||
$sCount, $imgStart, $unUsed)=unpack( "CCvCCvVC", $initialEntry); | ||
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if( $boot != 0x88 ){ | ||
die "Boot indicator in Initial/Default-Entry is not 0x88. CD is not bootable. \n"; | ||
} | ||
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print STDERR "Boot media type is: "; | ||
if( $media == 0 ){ | ||
print STDERR "no emulation"; | ||
$count=0; | ||
} | ||
if( $media == 1 ){ | ||
print STDERR "1.2meg floppy"; | ||
$count=1200*1024/$vSecSize; | ||
} | ||
if( $media == 2 ){ | ||
print STDERR "1.44meg floppy"; | ||
$count=1440*1024/$vSecSize; | ||
} | ||
if( $media == 3 ){ | ||
print STDERR "2.88meg floppy"; | ||
$count=2880*1024/$vSecSize; | ||
} | ||
if( $media == 4 ){ | ||
print STDERR "harddisk"; | ||
$MBR=getSector($imgStart, 1, $imageFile ); | ||
$partition1=substr($MBR, 446, 16); | ||
($unUsed, $firstSector, $partitionSize) = unpack( "A8VV", $partition1); | ||
$count=$firstSector + $partitionSize; | ||
} | ||
print STDERR "\n"; | ||
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# Only use the internal sector counter if the real size is unknown | ||
# ($count==0) | ||
$cnt=$count==0?$sCount:$count; | ||
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print STDERR "El Torito image starts at sector $imgStart and has $cnt sector(s) of $vSecSize Bytes\n"; | ||
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# We are there: | ||
# Now read the bootimage to stdout | ||
$image=getSector($imgStart, $cnt, $imageFile); | ||
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if( length($outputFilename) ){ | ||
writeOutputFile($outputFilename, $image); | ||
print STDERR "\nImage has been written to file \"$outputFilename\".\n"; | ||
}else{ | ||
print "$image"; | ||
print STDERR "Image has been written to stdout ....\n"; | ||
} |
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--- | ||
bookFlatSection: true | ||
--- | ||
|
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# DSGVO Löschungsantrag | ||
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Den folgenden Text habe ich am 2018-08-10 an change.org geschickt, um mein Konto zu Schließen und | ||
eine vollständige Löschung meiner Daten zu beantragen. Ich glaube, dass er sich gut als Vorlage für | ||
zukünftige Löschungsersuchen eignet: | ||
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> Sehr geehrte Damen und Herren, | ||
> | ||
> ich möchte Sie hiermit auffordern alle personenbezogenen Daten zu meiner Person, die Sie | ||
> gespeichert haben vollständig zu löschen (§17 DSGVO) und mein Konto zu schließen. | ||
> | ||
> Sollte eine vollständige Löschung aufgrund von Mindestaufbewahrungsfristen nicht möglich sein, so | ||
> widerspreche ich hiermit mindestens aber einer weiteren Verwendung meiner Daten zu Werbe- und | ||
> Marktforschungszwecken und der Übermittlung an Dritte. In diesem Fall bitte ich um Auskunft über | ||
> die verbleibenden gespeicherten Daten. | ||
> | ||
> Bitte bestätigen Sie mir die Löschung schriftlich per E-Mail. | ||
> | ||
> Mit freundlichen Grüßen,<br> Anton Semjonov |
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## Notizen zur privaten Haftpflichtversicherung | ||
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Günstige Tarife gibt es bspw. bei der [HUK-Coburg](https://www.huk.de/tarifrechner/ph/unser-angebot) | ||
oder deren Direktversicherungs-Tochter [HUK24](https://www.huk24.de/tarif_hus_ph.do). Je nach | ||
Selbstbeteiligung und Zusatzleistungen landet man dort bei 40 bis 55 €. Ein anderer, sehr gut | ||
bewerteter Versicherer ist die [VHV Gruppe](https://www.vhv.de/). |
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+++ | ||
title = "Rechenzentrum" | ||
weight = 70 | ||
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bookFlatSection = true | ||
bookCollapseSection = true | ||
+++ | ||
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# Rechenzentrum | ||
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... is the name I gave my little deskside homelab. It also means *datacentre* in German. | ||
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This section contains information on: | ||
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* booting systems over the network | ||
* performing automated installations | ||
* managing a small number of machines | ||
* various general sysadmin tasks |
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