Debian MD5 Digests
After 4 failed attempts at installing Debian Linux from CDs
that were burned from downloaded .iso files, I've finally come to
the conclusion that my CD Burner is not working properly ....
Three of the .iso files I tried for a Sarge install were versions
of the Debian net-install and one built from .jigdo ....
o net-install
Beta-4
Current .... 2004-07-23
Current .... 2004-07-25
o .jigdo ....... 2004-07-25
The md5 digests of all downloaded .iso files has checked out OK
in each case PRIOR to burning them to CD and in each case
the burned CDs always boot and begin the Debian install proc
which ultimately fails due to md5 errors .....
I was just too dense to consider CD burning problems at the time
and so it took 4 install failures to finally get it through my thick skull
that something on THIS particular machine was fouled ....
The Debian installer doesn't present the user
with the opportunity to check CD-ROM integrity
until after the failures during the initial install proc
have occurred, which seems a bit late ....
It would probably be cool if the installer would
present the menu with the option to check the CD
before anything else starts ....
I wrote a small Python script to check md5s of the burned CD files
against those in the supplied md5sum.txt file on sarge-i386-1,
but since the burned CD I have is corrupted,
testing the script is somewhat tedious and fails
at different points in processing which I think/hope
will go away when I get a good CD burn ....
However, I would like to hear from someone
who has a Debian CD with the md5sum.txt file
on it that would test the script and see if it
actually runs all the way to completion ....
Although I tested the script against sarge-i386-1,
probably any of the md5sum.txt files that contain data
in the form of md5_value path should work ....
Are all the files that are listed in the md5sum.txt file
always included on the CD ????
I added a check for this after seeing file not found errors
while running the script ....
# ------------------------------------------------------------------------------------------
#
# deb_md5.py
import md5 , os , sys
if len( sys.argv ) < 2 :
print ' Usage .......... python deb_md5.py base_path_to_CD'
sys.exit( -1 )
base_path = sys.argv[ 1 ]
if not os.path.exists( base_path ) :
print ' **** Base Path NOT Found ****'
sys.exit( -2 )
os.chdir( base_path )
file_in = file( 'md5sum.txt' , 'r' )
def md5_digest( xPath ) :
xFile = file( xPath , 'rb' ).read()
m = md5.new()
m.update( xFile )
return m.hexdigest()
rec_num = 0
for this_line in file_in :
this_list = this_line.split()
this_md5 = this_list[ 0 ]
this_path = this_list[ 1 ]
rec_num += 1
if os.path.exists( this_path ) :
that_md5 = md5_digest( this_path )
if this_md5 != that_md5 :
print '%4d * MD5 Error * %s ' % ( rec_num , this_path )
else :
print '%4d %s' % ( rec_num , this_path )
else :
print '%4d * Not Found * %s' % ( rec_num , this_path )
file_in.close()
--
Cousin Stanley
Human Being
Phoenix, Arizona
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