On Friday 13 June 2014 11:28, Jack Mitchell wrote: > I have recently upgraded to busybox v1.18.3 to v1.22.1 and seem to have > discovered a bug in zcat. > > I'm not entirely sure what the problem is, but files don't seem to be > extracted correctly. The following procedure creates a basic filesytem > image, gzips it on the host then scp's it to the target where zcat fails > to properly extract it, while gunzip -c succeeds. It's very similar to > my use-case and shows the issue. > > On the host: > > [jack@jackArch busybox-test]$ dd if=/dev/zero of=test.img bs=1MB count=100 > 100+0 records in > 100+0 records out > 100000000 bytes (100 MB) copied, 0.157787 s, 634 MB/s > > [jack@jackArch busybox-test]$ mkfs.ext3 test.img > mke2fs 1.42.9 (28-Dec-2013) > Allocating group tables: done > Writing inode tables: done > Creating journal (4096 blocks): done > Writing superblocks and filesystem accounting information: done > > [jack@jackArch busybox-test]$ sudo mount test.img /mnt/tmp > [sudo] password for jack: > > [jack@jackArch busybox-test]$ ls -la /mnt/tmp > total 17 > drwxr-xr-x 3 root root 1024 Jun 12 17:14 . > drwxr-xr-x 10 root root 4096 Jun 9 13:18 .. > drwx------ 2 root root 12288 Jun 12 17:14 lost+found > > [jack@jackArch busybox-test]$ sudo umount /mnt/tmp > > [jack@jackArch busybox-test]$ dd if=test.img bs=1k | gzip -v9 > test-zcat > 97656+1 records in > 97656+1 records out > 100000000 bytes (100 MB) copied, 0.574901 s, 174 MB/s > 99.9% > > [jack@jackArch busybox-test]$ scp test-zcat [email protected]:/mnt/persist > test-zcat > 100% 108KB 108.5KB/s 00:00 > > > On the target: > > target# pwd > /mnt/persist > > target# ls -lah test-zcat > -rw-r--r-- 1 root root 108.5K Jun 13 09:19 test-zcat > > target# time zcat test-zcat > test.img > real 0m 0.00s > user 0m 0.00s > sys 0m 0.00s > > target# ls -lah test.img > -rw-r--r-- 1 root root 108.5K Jun 13 09:20 test.img > > target# mount test.img /mnt/tmp/ > mount: wrong fs type, bad option, bad superblock on /dev/loop4, > missing codepage or helper program, or other error > > In some cases useful info is found in syslog - try > dmesg | tail or so. > > target# time gunzip -c test-zcat > test2.img > real 0m 1.90s > user 0m 1.31s > sys 0m 0.58s > > target# ls -lah test2.img > -rw-r--r-- 1 root root 95.4M Jun 13 09:21 test2.img > > target# mount test2.img /mnt/tmp/ > > target# ls -la /mnt/tmp/ > drwxr-xr-x 3 root root 1024 Jun 12 16:14 . > drwxr-xr-x 9 root root 4096 Jun 12 16:32 .. > drwx------ 2 root root 12288 Jun 12 16:14 lost+found > > If you have any questions please let me know and I'll do my best to help.
Please try current git. I remember there was a fix for this. _______________________________________________ busybox mailing list [email protected] http://lists.busybox.net/mailman/listinfo/busybox
