How to check if a Unix .tar.gz file is a valid file without uncompressing?

Question

I have found the question How to determine if data is valid tar file without a file?, but I was wondering: is there a ready made command line solution?

Answer 1

What about just getting a listing of the tarball and throw away the output, rather than decompressing the file?

tar -tzf my_tar.tar.gz >/dev/null

Edited as per comment. Thanks zrajm!

Edit as per comment. Thanks Frozen Flame! This test in no way implies integrity of the data. Because it was designed as a tape archival utility most implementations of tar will allow multiple copies of the same file!

Answer 2

you could probably use the gzip -t option to test the files integrity

http://linux.about.com/od/commands/l/blcmdl1_gzip.htm

from: http://unix.ittoolbox.com/groups/technical-functional/shellscript-l/how-to-test-file-integrity-of-targz-1138880

To test the gzip file is not corrupt:

gunzip -t file.tar.gz

To test the tar file inside is not corrupt:

gunzip -c file.tar.gz | tar -t > /dev/null

As part of the backup you could probably just run the latter command and check the value of $? afterwards for a 0 (success) value. If either the tar or the gzip has an issue, $? will have a non zero value.

Answer 3

If you want to do a real test extract of a tar file without extracting to disk, use the -O option. This spews the extract to standard output instead of the filesystem. If the tar file is corrupt, the process will abort with an error.

Example of failed tar ball test...

$ echo "this will not pass the test" > hello.tgz
$ tar -xvzf hello.tgz -O > /dev/null
gzip: stdin: not in gzip format
tar: Child returned status 1
tar: Error exit delayed from previous errors
$ rm hello.*

Working Example...

$ ls hello*
ls: hello*: No such file or directory
$ echo "hello1" > hello1.txt
$ echo "hello2" > hello2.txt
$ tar -cvzf hello.tgz hello[12].txt
hello1.txt
hello2.txt
$ rm hello[12].txt
$ ls hello*
hello.tgz
$ tar -xvzf hello.tgz -O
hello1.txt
hello1
hello2.txt
hello2
$ ls hello*
hello.tgz
$ tar -xvzf hello.tgz
hello1.txt
hello2.txt
$ ls hello*
hello1.txt  hello2.txt  hello.tgz
$ rm hello*

Answer 4

You can also check contents of *.tag.gz file using pigz (parallel gzip) to speedup the archive check:

pigz -cvdp number_of_threads /[...]path[...]/archive_name.tar.gz | tar -tv > /dev/null

Answer 5

I have tried the following command and they work well.

bzip2 -t file.bz2
gunzip -t file.gz

However, we can found these two command are time-consuming. Maybe we need some more quick way to determine the intact of the compress files.

Answer 6

A nice option is to use tar -tvvf <filePath> which adds a line that reports the kind of file.

Example in a valid .tar file:

> tar -tvvf filename.tar 
drwxr-xr-x  0 diegoreymendez staff       0 Jul 31 12:46 ./testfolder2/
-rw-r--r--  0 diegoreymendez staff      82 Jul 31 12:46 ./testfolder2/._.DS_Store
-rw-r--r--  0 diegoreymendez staff    6148 Jul 31 12:46 ./testfolder2/.DS_Store
drwxr-xr-x  0 diegoreymendez staff       0 Jul 31 12:42 ./testfolder2/testfolder/
-rw-r--r--  0 diegoreymendez staff      82 Jul 31 12:42 ./testfolder2/testfolder/._.DS_Store
-rw-r--r--  0 diegoreymendez staff    6148 Jul 31 12:42 ./testfolder2/testfolder/.DS_Store
-rw-r--r--  0 diegoreymendez staff  325377 Jul  5 09:50 ./testfolder2/testfolder/Scala.pages
Archive Format: POSIX ustar format,  Compression: none

Corrupted .tar file:

> tar -tvvf corrupted.tar 
tar: Unrecognized archive format
Archive Format: (null),  Compression: none
tar: Error exit delayed from previous errors.

Answer 7

These are all very sub-optimal solutions. From the GZIP spec

ID2 (IDentification 2)
These have the fixed values ID1 = 31 (0x1f, \037), ID2 = 139 (0x8b, \213), to identify the file as being in gzip format.

Has to be coded into whatever language you're using.

Answer 8

> use the -O option. [...] If the tar file is corrupt, the process will abort with an error.

Sometimes yes, but sometimes not. Let's see an example of a corrupted file:

echo Pete > my_name
tar -cf my_data.tar my_name 

# // Simulate a corruption
sed < my_data.tar 's/Pete/Fool/' > my_data_now.tar
# // "my_data_now.tar" is the corrupted file

tar -xvf my_data_now.tar -O

It shows:

my_name
Fool  

Even if you execute

echo $?

tar said that there was no error:

0

but the file was corrupted, it has now "Fool" instead of "Pete".