#!/bin/bash
# Author: Athmane Madjoudj <athmanem@gmail.com>
# Author: Christoph Galuschka <christoph.galuschka@chello.at>
# Author: Iain Douglas <centos@1n6.org.uk>
# Author: Rene Diepstraten <rene@renediepstraten.nl>

function ExitFail {
    t_Log "FAIL"
    exit $FAIL
}

function cleanup {
rm $FILE* &>/dev/null
rm /var/tmp/gziptest/* &>/dev/null
rmdir /var/tmp/gziptest &>/dev/null
}

t_Log "Running $0 - run a file through gzip,zcat and gunzip test."

# create file
FILE=/var/tmp/gzip-test.txt

# Just in case earlier runs failed
cleanup
# Use the provided file as it has known contents and known name/timestamp
# information.

cp ./tests/p_gzip/gzip-test.txt.gz  /var/tmp

#run file through gunzip
t_Log "Test basic gunzip"
gunzip $FILE.gz
#checking file contents
grep -q 'gzip-test of single file' $FILE || ExitFail

# run file through gzip
t_Log "Test basic gzip"
gzip $FILE || ExitFail

#just to make sure
/bin/rm -rf $FILE

#run file through zcat
t_Log "Test basic zcat"
zcat $FILE.gz | grep -q 'gzip-test of single file' || ExitFail

# Basic tests complete - go a little deeper.

# Check that we cannot overwrite an existing file
t_Log "Check files will not be overwritten"
touch $FILE
echo | gunzip $FILE  &>/dev/null
[ $? -ne 2 ]  && ExitFail

echo | gzip $FILE  &>/dev/null
[ $? -ne 2 ]  && ExitFail

# Check that we can force files to be overwritten
t_Log "Check force overwrite"
gunzip -f $FILE.gz  || ExitFail
touch $FILE.gz
gzip -f $FILE || ExitFail

# Check that -a is ignored 
t_Log "Check -a is ignored as we're on CentOS"
if [ $centos_ver == '5' ]
  then
  gunzip -a $FILE.gz 2>&1 | head -n 1 | grep  -q 'gunzip: option --ascii ignored on this system' || ExitFail
elif [[ $centos_ver =~ ^(6|7|8)$ ]]
  then
  gunzip -a $FILE.gz 2>&1 | head -n 1 | grep  -q 'gzip: option --ascii ignored on this system' || ExitFail
fi

# Check -c writes to stdout
t_Log "check -c writes to stdout"

gzip -c $FILE | gunzip | grep -q 'gzip-test of single file' || ExitFail

# Check the correct info is listed for -l the output is
#         compressed        uncompressed  ratio uncompressed_name
#                 59                  25  24.0% /var/tmp/gzip-test.txt
#
# The md5sum is 4cbaba004a815915904bd524ede5edec
#
# The 32-bit gzip behaves differently:
# 
#         compressed        uncompressed  ratio uncompressed_name
#                 59                  25  -8.0% /var/tmp/gzip-test.txt
#
# The md5sum is caf6dee7a56022a840316520134967a4

t_Log "Check the output of -l"
gzip $FILE
mdhash=$(gzip -l $FILE.gz | md5sum | cut -f1 -d' ')
[ "$mdhash" == "4cbaba004a815915904bd524ede5edec" -o "$mdhash" == "caf6dee7a56022a840316520134967a4" ] || ExitFail

# Check that -q works which removes the header information from -l
t_Log "Check -q reduced the output verbosity"
gzip -ql $FILE | grep -qv "ratio" || ExitFail

# Check -v gives us more information - we shouls see the files
# CRC which is d14bbb86
t_Log "Check -v increases verbosity"
gzip -lv $FILE | grep -q "d14bbb86" || ExitFail

# Check -n and -N work correctly. The original datestamp on the
# test file is '2010-11-22 13:11' gzip-test.txt
# At this point we shouldn't see the original timestamp if the default 
# -n to gunzip and -N to gzip are working.

t_Log "check -n and -N work correctly"
TZ_SAVE=$TZ
export TZ=UTC
gunzip $FILE.gz
ls -l --time-style=+"%F %R" $FILE | grep -q '2010-11-22 13:11' &&  ExitFail

# Reset the test file with a different name
# the file should gunzup as gzip-test.1
cp ./tests/p_gzip/gzip-test.txt.gz /var/tmp/gzip-test.txt.1.gz
gunzip $FILE.1.gz
[ -e "$FILE.1" ] || ExitFail

# Reset the test file with a different name
cp ./tests/p_gzip/gzip-test.txt.gz /var/tmp/gzip-test.txt.1.gz

# The file should gunzip with it's original name and timestamp.
gunzip -f -N $FILE.1.gz
ls -l $FILE --time-style=+"%F %R" | grep  -q '2010-11-22 13:11' || ExitFail
export TZ=$TZ_SAVE
# Check that -t works and detects a damaged file
t_Log "Check -t can detect a corrupt file"
gzip $FILE
echo -ne \\x34 | dd conv=notrunc bs=1 count=1 seek=27  of=$FILE.gz &>/dev/null
gzip -t $FILE.gz 2>&1 | grep -qv "data--crc error" || ExitFail

# Check we can use a custon suffix .iain will do ;)
t_Log "Check that a custom suffix can be used -S"
cp ./tests/p_gzip/gzip-test.txt.gz /var/tmp/gzip-test.txt.gz
gunzip $FILE.gz
gzip -S .iain $FILE
[ -e $FILE.iain ] || ExitFail
gunzip -S .iain $FILE || ExitFail

# Check that -r works - create a directory, populate it then just pass
# the dirname to gzip - it should zip all the files.

t_Log "Check that -r works "
mkdir /var/tmp/gziptest
touch /var/tmp/gziptest/a
touch /var/tmp/gziptest/b
gzip -r /var/tmp/gziptest
[ "$(ls /var/tmp/gziptest/*.gz | wc -l)" -eq "2" ] || ExitFail

# Text the different compression levels
t_Log "Check different compression levels"
gzip -1 $FILE.1   # 61 bytes
gzip -9 $FILE     # 59 bytes
[ "$(stat -c %s $FILE.gz)" -ne "$(stat -c %s $FILE.1.gz)" ] || ExitFail

# Multiple input files 
t_Log "Multiple input files on the command line"
# Multiple files on one command line
gunzip $FILE.1.gz $FILE || ExitFail

# Don't specify the .gz extension
t_Log "No file extension supplied for gunzip"
gzip $FILE $FILE.1  || ExitFail

# Compress the file then get gunzip to uncompress it, the file needs
# to be larger for compress to work
t_Log "Check gunzip can handle .Z files"
gunzip $FILE 
ls -l /var/tmp >>$FILE
compress $FILE || ExitFail
gunzip $FILE.Z || ExitFail

# Zip the file then get gunzip to uncompress it.
t_Log "Check gunzip can handle .zip files"
zip $FILE.zip $FILE  &>/dev/null || ExitFail
gunzip -f  -S .zip $FILE.zip  || ExitFail

# Handle .tgz correctly
t_Log "Check gunzip creates a .tar file from .tgz"
tar -czf $FILE.tgz $FILE &>/dev/null
gunzip $FILE.tgz
[ -e $FILE.tar ] 
t_CheckExitStatus $?

#tar the file rename it to .tgz 
#reversing changes
cleanup