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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">File descriptors are just ways to keep track of open files. (Remember everything in Linux/UNIX is really a “file” just not necessarily a “regular file”.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">There’s a good discussion of ways to set and use FDs other than 0-2 at:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><a href="http://www.tldp.org/LDP/abs/html/io-redirection.html">http://www.tldp.org/LDP/abs/html/io-redirection.html</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Additionally I notice the man page for gpg has other options to SET file descriptors.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">You might look at the rest of the script (or whatever calls it) to see if it is setting a FD before it gets to the line below.<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> ale-bounces@ale.org [mailto:ale-bounces@ale.org]
<b>On Behalf Of </b>Neal Rhodes<br>
<b>Sent:</b> Sunday, November 17, 2013 11:57 PM<br>
<b>To:</b> Atlanta Linux Enthusiasts<br>
<b>Subject:</b> [ale] FD 3 on gpg?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Here is a boiled down script buried in the bowels of a system which uploads data from pharmacies:
<o:p></o:p></p>
<p class="MsoNormal">CMD="gpg --homedir $HOME_DIR/.gnupg --batch --passphrase-fd 3 --decrypt $HOLD 2> /tmp/gpg.err.$$ | /usr/local/bin/$PARSER 2>> $LOG_FILE"<br>
eval "$CMD"<o:p></o:p></p>
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Which actually works. I cannot fathom how. The FM says it will read the passphrase from file descriptor 3. Uh...Stdin, Stdout, Stderr, There goes 0, 1, 2. uh, that would be a file defined within gpg?
<br>
<br>
Well, it sorta works. If you wiggle it, or jiggle it, modify it various ways, it stops working and typically says "Bad passphrase".
<br>
<br>
This:<o:p></o:p></p>
<p class="MsoNormal">CMD="cat something-something-icanttellyou/k_file.asc | gpg --homedir $HOME_DIR/.gnupg --batch --passphrase-fd 0 --decrypt $HOLD 2> /tmp/gpg.err.$$ | /usr/local/bin/$PARSER 2>> $LOG_FILE"<br>
eval "$CMD"<o:p></o:p></p>
<p class="MsoNormal"><br>
Does work reliably under various combinations. <br>
<br>
Maybe there is some magic about FD 3 here, but I'm not finding it. Something about gpg-agent?
<br>
<br>
Neal Rhodes<br>
MNOP Ltd <o:p></o:p></p>
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