add blogentry about conkeror, mozilla and a temp directory
Signed-off-by: Nico Schottelius <nico@ikn.schottelius.org>
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blog/mozilla-conkeror-change-tempdir.mdwn
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blog/mozilla-conkeror-change-tempdir.mdwn
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[[!meta title="How to change the tempdir for Mozilla (general) and conkeror"]]
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Some weeks ago I got a good hint from
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[[Axel Stefan Beckert|dokumentationen/axel-stefan-beckert]], to try [conkeror](http://conkeror.org/)
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as an alternative for the
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[Firefox](http://www.mozilla.com/en-US/firefox/firefox.html) browser.
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Although I am not used to the [emacs](http://en.wikipedia.org/wiki/Emacs)
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shortcuts, it is very good usable with the keyboard only.
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In the last few days I have been missing one important feature,
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one of the most important features of a browser:
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to be able to edit a textbox with an external editor
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I often edit large wiki pages and rearange them, which is a pain
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without a real editor.
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Conkeror supports [external editing](http://conkeror.org/ExternalEditing),
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but defaults to
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* $VISUAL
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* $EDITOR
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* or emacs
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None of the is usable for me, because **$VISUAL** and **$EDITOR**
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are set to [vim](http://www.vim.org/) and vim requires a terminal.
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After I was told on [#conkeror](irc://irc.freenode.org/#conkeror)
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to modify ***~/.conkerorrc/init.js*** to include
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editor_shell_command = "urxvt -e vim";
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it worked like a charm (besides debugging it for some others days,
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until I found out that there was always one instance of conkeror
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running, so it never re-read the configuration file). I can now
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edit textboxes in conkeror with vim!
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But then I noticed, that conkeror creates a temporary file below
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***/tmp***, which I do not like, because all my data should be
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put on my [encrypted home directory](http://code.google.com/p/cryptsetup/),
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not on the unencrypted root partition.
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So I started to search for a configuration variable in the
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[configuration window](about:config), but did not find any hint.
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As I am running conkeror from the git source, I began to dig through it
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and started in **modules/external-editor.js**, where I found the
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function **open_with_external_editor()**:
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76 function open_with_external_editor (lspec) {
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77 keywords(arguments);
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78 let [file, temp] = yield download_as_temporary(lspec);
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79 yield open_file_with_external_editor(file, $line = arguments.$line, $temporary = temp);
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80 }
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Ok, what is **download_as_temporary()** doing? The file **modules/save.js** helped
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me:
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228 function download_as_temporary (lspec) {
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243 var file = get_temporary_file(suggest_file_name(lspec));
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Well, well, so what's about the **get_temporary_file()** function? The file
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**modules/utils.js** contains it:
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799 function get_temporary_file (name) {
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800 if (name == null)
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801 name = "temp.txt";
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802 var file = file_locator.get("TmpD", Ci.nsIFile);
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803 file.append(name);
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804 // Create the file now to ensure that no exploits are possible
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805 file.createUnique(Ci.nsIFile.NORMAL_FILE_TYPE, 0600);
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806 return file;
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807 }
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Searching for **Ci.nsIFile** in conkerors source did not reveal
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many information, so I got back to my **seoc** (search engine of choice) and
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found some hints on the [mozilla developer center](https://developer.mozilla.org)
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about [nsIFile](https://developer.mozilla.org/en/nsIFile) and
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[TmpD](https://developer.mozilla.org/en/Code_snippets/File_I%2F%2FO)
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and a reference to the IRC channel [#extdev](irc://irc.mozilla.org/extdev).
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After I described my problem in that IRC channel,
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[Michael Kaply](http://www.kaply.com/weblog/about/)
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told me the answer to the question
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"[What defines or where is the TmpD variable defined?](http://mxr.mozilla.org/mozilla1.9.2/source/xpcom/io/SpecialSystemDirectory.cpp#568)":
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The temporary directory is OS specific and in my case (unix) defined by the
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environment variables
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* $TMPDIR
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* $TMP
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* $TEMP (tried in that order)
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After I set
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TMP=~/.tmp
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and restarted conkeror, pressed C-i in a textbox, the file is eventually saved
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in the temporary directory **.tmp** in my home directory!
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[[!tag eth net]]
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