I'm driven crazy by a new problem.
It seems very complex to me and I see no way to come around.
In my script, I receive the path to a tgz file and I want to output the md5 sum of the file inside the tgz. I want a way to detect if tar fails.
I'm using the following command
Code:
tar -xzOf "$1" 2>/dev/null | md5sum | cut -b-32
If the tgz contains a regular file, this command returns its md5 sum.
If the tgz contains an empty file, it returns d41d8cd98f00b204e9800998ecf8427e.
If the tgz is corrupted, it will also return d41d8cd98f00b204e9800998ecf8427e.
Invoking the error code will not help because it will return the one of the last command which is cut.
How would you do that? I need to output the md5sum of the zipped file (empty or not) and I want something else (empty, error code, whatever) if the tgz is corrupted.
Thanks bartus11
Your script works indeed.
The thing is that I'm working with big files and I wanted to avoid using tar twice.
A simple tar -tzf can take up to 4 seconds. Files are processed one by one and your script would double the time necessary to complete all files.
If you find any other way to avoid that, it would be great.
Thanks anyway for your proposal.
Santiago
---------- Post updated at 18:52 ---------- Previous update was at 18:36 ----------
Actually, I need to invoke tar twice in my script and I wanted to avoid invoking it three times.
First time I get the md5sum, second time, I read the statistics from tar -t.
Then I insert those informations in a database.
So here is what I did:
Code:
file_md5=$(tar -xzOf "$1" 2>/dev/null | md5sum | cut -b-32)
(tar -tzvf "$1" 2>/dev/null || echo error) | while read -r file_mod file_owner dummy file_date file_time name; do
query="UPDATE uploaded
SET file_mod = '${file_mod:1}',
file_owner = '${file_owner%%/*}',
file_group = '${file_owner#*/}',
file_time = '$file_date $file_time',
file_md5 = '$file_md5',
name = \"$name\",
status = IF('$file_mod' == 'error', 3, status)
WHERE id = $id"
done
Alternatively, in ksh93 and bash you can use pipefail, so that the RC at the end of pipes is the value of the last non-zero command to fail or zero if no command has failed.
Code:
set -o pipefail
tar -xzOf "$1" 2>/dev/null | md5sum | cut -b-32 || echo "error - tar corrupted?" >&2
set +o pipefail
output:
Code:
d41d8cd98f00b204e9800998ecf8427e
error - tar corrupted?
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