Ask for Version of Script on Server w/o download


 
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# 8  
Old 11-12-2010
Corona688s solution works flawless, th eonly problem I got now, is to check in my script where I use wget, what wgets check sayed.
Here's a part of my script:
Code:
wget -N -a $logfile -t 0 http://www.google.com/
if [ $? -eq 0 ]
then
     [what to do if new file was downloaded from server]
else
     [what to do if local file isn't updated]
fi

Anyone got an answer to my problem? Smilie
Thanks in advance!
# 9  
Old 11-12-2010
Hm, it returns success in either case. Have to check its error output instead.

Code:
TMP=`mktemp`
if wget -N http://server/file 2> "$TMP"
then
        if grep -q "Not retrieving" "$TMP"
        then
                echo "Already up to date"
        else
                echo "New file retrieved"
        fi
else
        echo "Couldn't download file"
fi
rm -f "$TMP"

[edit] A smarter way might be by what wget itself does, check timestamps.

Code:
TMP=`mktemp`
# Set temp file to the same timestamp as current file
touch --reference=outputfile "$TMP"

if wget -N http://path/to/file
then
        # Compare timestamps.  If outputfile is newer, it got updated
        if [ outputfile -nt "$TMP" ]
        then
                echo "New file downloaded"
        else
                echo "No new version"
        fi
else
        echo "Error retrieving file"
fi
# Don't clutter up /tmp
rm -f "$TMP"

This User Gave Thanks to Corona688 For This Post:
# 10  
Old 11-12-2010
Thanks a LOT Smilie
I got so much problems with wget, I hope that was the last thing >_>
# 11  
Old 11-16-2010
I'm sorry t say this, but my code is still causing trouble T_T
The first solution doesn't work because I need to write every output in a logfile, if I'm trying to do it like this:
Code:
wget -N -t 0 http://somesite/somefile 2> "$TMP"
$TMP >> logfile

I'm getting an error "Permission denied"...
It works well and recognizes that there's no new update but I still need to write everything in a logfile >_>

[edit]: I forgot to mention: I got several update procedures in one logfile, so it's not possible to grep "Not retrieving" out of it :/

[edit2]; Silly me... solved it ^^
Code:
TMP=/some/where/tempfile.txt
wget -N -t 0 http://somesite/somefile 2> "$TMP"
$TMP >> logfile
if cat $TMP | grep -q "Not retrieving"
then
     echo "Theres no newer version..."
else
     echo "New File downloaded!"
fi

Works perfect Smilie

Last edited by al0x; 11-16-2010 at 08:52 AM..
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