Re: Terminal – ls-like command for http directories?

[Johnny Rosenberg]

2013/5/25 Johnny Rosenberg <gurus.knugum at gmail.com>:
> Is this possible?
>
> Okay, an example:
> I have a script that downloads and installs unetbootin to my system. I
> run the script like this:
>
> ./Install.sh 583
>
> This downloads and ”installs” Unetbootin 5.83, which means it uses
> wget to download the file, then moves the file to a proper place and
> finally adds a link to it in ~/bin so I can run it by only typing:
> unetbootin
>
> Now, for this to work, I first need to find out what is the latest
> version, for instance by looking it up in my web browser. Then I can
> run my install script.
>
> Of course it would be more convenient if the script could find the
> latest version for me.
>
> The latest version (today, 2013-05-25) is:
> http://tenet.dl.sourceforge.net/project/unetbootin/UNetbootin/583/unetbootin-linux-583
>
> So what I need is a command like:
> some_ls-like_command
> "http://tenet.dl.sourceforge.net/project/unetbootin/UNetbootin/"
> Then I guess I would have a loop that determines the highest value
> somehow, but I guess I will figure that part out.
>
> That directory currently looks like this:
> 180/    -       21-Jul-2009 00:18
> 189/    -       17-Jul-2009 23:46
> 191/    -       17-Jul-2009 23:46
> 201/    -       17-Jul-2009 23:46
> 214/    -       29-Aug-2012 00:37
> 215/    -       06-Sep-2012 00:38
> 216/    -       27-Aug-2012 00:37
> 225/    -       17-Jul-2009 23:46
> 229/    -       17-Jul-2009 23:46
> 235/    -       17-Jul-2009 23:46
> 241/    -       17-Jul-2009 23:46
> 243/    -       17-Jul-2009 23:46
> 248/    -       27-Nov-2012 01:18
> 262/    -       10-Jul-2012 05:27
> 265/    -       17-Jul-2009 23:46
> 272/    -       11-Jul-2012 03:42
> 274/    -       17-Jul-2009 23:46
> 275/    -       12-Jul-2012 00:43
> 281/    -       17-Jul-2009 23:46
> 282/    -       13-Nov-2012 07:35
> 299/    -       03-Oct-2012 00:35
> 304/    -       22-Nov-2012 00:43
> 306/    -       08-Nov-2012 00:39
> 307/    -       12-Aug-2012 00:37
> 310/    -       17-Jul-2009 23:46
> 312/    -       15-Aug-2012 00:41
> 319/    -       18-Aug-2012 01:04
> 323/    -       01-Nov-2012 00:21
> 344/    -       01-Sep-2012 00:37
> 356/    -       17-Jul-2009 23:46
> 372/    -       20-Sep-2009 21:22
> 377/    -       28-Oct-2009 23:21
> 391/    -       01-Feb-2010 06:07
> 393/    -       15-Oct-2012 02:13
> 408/    -       13-Feb-2010 22:20
> 419/    -       11-Oct-2012 00:40
> 424/    -       27-Mar-2010 21:10
> 429/    -       27-Jan-2013 03:04
> 433/    -       19-Oct-2012 00:35
> 436/    -       22-Oct-2012 00:30
> 442/    -       23-Oct-2012 00:29
> 466/    -       03-Jun-2010 07:11
> 471/    -       31-Oct-2012 00:22
> 485/    -       03-Nov-2012 00:25
> 490/    -       01-Dec-2012 00:25
> 491/    -       02-Dec-2012 00:56
> 494/    -       11-Oct-2010 01:04
> 502/    -       22-Dec-2012 06:28
> 506/    -       14-Jan-2013 02:11
> 527/    -       27-Mar-2011 03:29
> 549/    -       15-Jan-2013 00:23
> 555/    -       17-Mar-2013 00:48
> 563/    -       27-Apr-2013 00:18
> 568/    -       21-May-2013 00:26
> 575/    -       28-Apr-2012 08:02
> 577/    -       13-Jul-2012 04:06
> 578/    -       15-Jul-2012 02:25
> 581/    -       27-Aug-2012 07:07
> 583/    -       24-Dec-2012 08:45
> Custom/
>
>
> Johnny Rosenberg

Okay, I solved it, I think, see 3.1 in my script:
#!/bin/sh

# To do:
# Some error handling, perhaps?

# 1. Variables
UnetbootinPath="${HOME}/Eget/Nerladdat/Verktyg/Boot/Unetbootin"
OldVersionsPath="${UnetbootinPath}/Gamla versioner"
NewVersionPath="${UnetbootinPath}/Senaste"
RunPath="${HOME}/bin"

DownloadPath="http://tenet.dl.sourceforge.net/project/unetbootin/UNetbootin"

# 1.1. These folders are created by the next wget next command below.
SourceForgePath="${UnetbootinPath}/tenet.dl.sourceforge.net"
ContentsPath="${SourceForgePath}/project/unetbootin"

# 2. Just doing an unnecessary parameter check…
if [ $# -ne 1 ]; then
	echo "Alla parametrar ignoreras."
	echo
fi

# 3. Determine the latest version.
# No error handling at the moment…
wget -r "${DownloadPath}"

# 3.1. The HTML file UNetbootin in ${ContentsPath} has been created. It contains
#      the sub-diectories of ${DownloadPath}. The second to last line represents
#      the sub-directory for the latest version.
Version=$(html2text "${ContentsPath}/UNetbootin" | \
	tail -2 | head -1 | sed -r 's/([0-9]*).*/\1/')
FileName="unetbootin-linux-${Version}"
rm -fr "${SourceForgePath}"

# 3.2. Maybe the latest version is already installed?
if [ -f "${NewVersionPath}/${FileName}" ]; then
	echo "Senaste versionen är redan installerad."
	exit 1
fi

# 4. Download the latest version.
wget "${DownloadPath}/${Version}/${FileName}"

# 5. Add the run flag to the downloaded file.
chmod +x "${UnetbootinPath}/${FileName}"

# 6. Move files to where they belong.
# 6.1. First, the file in ${NewVersionPath} isn't the newest anymore.
#      Now, move that file to the path for older versions.

cd "${NewVersionPath}/"
mv $(ls | grep "unetbootin-linux") "${OldVersionsPath}/"

# 6.2. Now, move the downloaded file to ${NewVersionPath}.
cd "${UnetbootinPath}"
mv $(ls | grep "unetbootin-linux") "${NewVersionPath}/"

# 6.3. Create a link to the new file in ${RunPath}.
cd "${NewVersionPath}/"
ln -fs $(find "${NewVersionPath}/" | \
	grep "unetbootin-linux") "${RunPath}/unetbootin"

cd "${UnetbootinPath}"


Now, after running this script, the latest version is located in the
latest version directory and a link to it, called ”unetbootin”, is
avaliable in ~/bin.
So I tried to open it by typing ”unetbootin” in a terminal, but it
failed to open. A password is needed to run unetbootin, and that
dialogue came up as expected. I entered my password, clicked OK, the
dialogue disappeared, but then nothing more happened.
If I type ~/bin/unetbootin, the program runs as expected.
~/bin is included in $PATH as the first path, so I shouldn't really
need to type anything more than just unetbootin.

I am obviously missing something, right?


Johnny Rosenberg