extra bytes in zip archive when used with logrotate

[Oleg Goldshmidt]

Martha Greenberg <marthag at MIT.EDU> writes:

> Run zip with the -q option.  Otherwise, the output of zip ends up in
> the created zip file.  You can see this by running strings on the
> zip file, which (without -q) shows:
>
>  (deflated 3%)
>
> Adding -q to zip fixes this.

Well, answering both to shimi and to Martha: you are both spot on,
especially Martha - thanks!

Adding -q fixes the problem. I am inserting below the beginning and
the end of "od -c" of the zip archive for illustation.

Now, while the problem is fixed I am not satisfied yet:

1) I have never had to add -q before: zip/unzip have always worked
   fine. Why now? The man page does not say anything really

2) It is my script that calls zip - it is not called by logrotate or
   anything: why piping from cat or gunzip (used by logrtate) works
   fine but piping from logrotate somehow causes the problem? Note
   also that the script does not zip stdin directly - it zips a file.

The output of "od -c" follows (sorstdout.log is the actual name of the
log file rotated by logrotate).

----------------- od_begin.txt -------------------------

0000000   P   K 003 004 024  \0  \0  \0  \b  \0   ! 240 006   A 346 344
0000020   ] 246 256  \n  \0  \0 031 357 001  \0  \r  \0 034  \0   s   o
0000040   r   s   t   d   o   u   t   .   l   o   g   U   T  \t  \0 003
0000060   M 370 037   P   M 370 037   P   u   x  \v  \0 001 004  \0  \0
0000100  \0  \0 004  \0  \0  \0  \0   M 370 037   P   M 370 037   P   u
0000120   x  \v  \0 001 004  \0  \0  \0  \0 004  \0  \0  \0  \0 355 234
0000140 335 212   \ 327 025 204   } 235 247 350 027 310 244 373 354 275
0000160 316 351   # 204 301   8 276   0   D   6   ( 006 023 206 271 030
0000200 344 216   =   $ 232  \t   3   c 210 336   >   ] 265 344 374   <
0000220 300   G   n 352 303 027   B   3 242 274   , 363 225 004 325 373
0000240 213   /   B  \b   ! 204 020   B  \b   ! 204 020   B  \b   ! 204
0000260 020   B  \b   ! 204 020   B  \b   ! 204 020   B  \b   ! 204 020
0000300   B  \b   ! 204 020   B  \b   ! 204 020   B  \b   ! 204 020   B
0000320  \b   ! 204 020   B  \b   ! 204 020   B  \b   ! 204 020   B  \b

----------------- od_end.txt ------------------------------

0005100 200   / 026   T 357 275 341 004 335  \0 366   C 357 275 341 004
0005120 335  \0 366   C 357 275 301   7 021 252 367 336 340 213 005 325
0005140   {   o   8   A   7 200 375 320   {   o 360   = 201 352 275   7
0005160 233       / 201 357  \t   T 357 275 331 004   {  \t 354 207 336
0005200   { 263  \t 366 022 330 017 336   {   o 340   g 361 313   { 357
0005220  \r 374 244   |   y 357 275 201 237   c   / 357 275   7 360   s
0005240 354 345 275   7 234 260 350 006 320   | 336   { 303  \t   C   7
0005260 200 346 363 336 033   N 230 272 001   4 237 367 336   p   B 351
0005300 006 320   |   {   { 211   2 237 376 260   d   /   a 237 305 357
0005320 204 353  \r 330   g   - 235       /   a 237 204 354 204 242 023
0005340 344   % 354 223 220 235   P   t 202 274 204   } 022 262 023   t
0005360 003 325   q   N 220       (   d   e   f   l   a   t   e   d    
0005400   9   8   %   )  \n   P   K 001 002 036 003 024  \0  \0  \0  \b
0005420  \0   ! 240 006   A 346 344   ] 246 256  \n  \0  \0 031 357 001
0005440  \0  \r  \0 030  \0  \0  \0  \0  \0  \0  \0  \0  \0 244 201  \0
0005460  \0  \0  \0   s   o   r   s   t   d   o   u   t   .   l   o   g
0005500   U   T 005  \0 003   M 370 037   P   u   x  \v  \0 001 004  \0
0005520  \0  \0  \0 004  \0  \0  \0  \0   P   K 005 006  \0  \0  \0  \0
0005540 001  \0 001  \0   S  \0  \0  \0 365  \n  \0  \0  \0  \0

-- 
Oleg Goldshmidt | pub at goldshmidt.org