[SOLVED] mc in -current fails to open some .iso files, probably due to unexpected isoinfo output

lecho · 06-17-2016, 08:44 AM

Midnight Commander in -current fails to open (and view) some .iso files, probably to unexpected (improper?) isoinfo output.
First, isoinfo from -current. Partial output of the command

Quote:

isoinfo -l -i slackware-current-install-dvd.iso # one of Eric's slaklive files

Code:

Directory listing of /
        29 dr-xr-xr-x   1    0    0       6144 Jun 13 2016 [     29 02] . 
        29 dr-xr-xr-x   1    0    0       6144 Jun 13 2016 [     29 02] .. 
       657 -r-xr-xr-x   1    0    0      10205 Nov  4 2013 [    657 00] ANNOUNCE.14_ 
       662 -r-xr-xr-x   1    0    0      20933 Oct  2 2006 [    662 00] BOOTING.TXT 

Directory listing of /EXTRA/
   1278504 -r-xr-xr-x   1    0    0      40960 Jun  8 2016 [1278504 00] FILE_LIS 
18446744073709551598 -r-xr-xr-x   1    0    0          0 Mar  9 1971 [    -18 00] FLASHPLA 
       379 dr-xr-xr-x   1    0    0       2048 Dec 15 2015 [    379 02] FLTK

Now, the same from isoinfo from Slackware 14.1

Code:

Directory listing of /
d---------   0    0    0       6144 Jun 13 2016 [     29 02] . 
d---------   0    0    0       6144 Jun 13 2016 [     29 02] .. 
----------   0    0    0      10205 Nov  4 2013 [    657 00] ANNOUNCE.14_ 
----------   0    0    0      20933 Oct  2 2006 [    662 00] BOOTING.TXT 

Directory listing of /EXTRA/
----------   0    0    0      40960 Jun  8 2016 [1278504 00] FILE_LIS 
----------   0    0    0          0 Mar  9 1971 [    -18 00] FLASHPLA 
d---------   0    0    0       2048 Dec 15 2015 [    379 02] FLTK

Seems the unexpected first column in the first output is a problem, not mentioning funny entry for symbolic link.

Alien Bob · 06-17-2016, 10:21 AM

The ISO "slackware-current-install-dvd.iso" is a DVD installer of Slackware-current, not a Slackware Live ISO.
But indeed, the "isoinfo" changed its output format between Slackware 14.1 and 14.2.
The issue was also reported on the ALT Linux bug tracker where a patch is available too:

Code:

--- iso-orig	2004-04-26 16:17:18 +0300
+++ iso-orig	2004-06-28 13:18:59 +0300
@@ -40,7 +40,7 @@ 
   # Pattern to match 8 first fields.
   rx = "[^ 	]+[ 	]+";
   rx = "^" rx rx rx rx rx rx rx rx;
-  irx = "^. *[0-9]+.  ";
+  irx = "^. *[0-9 ]+.  ";
 }
 /^$/ { next }
 /^d---------/ { next }

lecho · 06-17-2016, 11:16 AM

Eric, of course you are right, this was the DVD installer made using your mirror-slackware-current script.
I'm not sure if the patch to extfs helper for mc you mentioned is still relevant to the current version of mc.
I think the problem is still with isoinfo - according to the manpage 'isoinfo -l' should give something like 'ls -lR' and the first column seems simply unnecessary. I cannot check it now if the change of the isoinfo output appeared after applying cdrtools-3.01-fix-20151126-mkisofs-isoinfo.patch. I wonder if this change was intentional.

lecho · 06-23-2016, 04:35 AM

More details about the isoinfo output can be found here https://sourceforge.net/p/cdrtools/m...ewmonth=201606
If someone still wants to inspect iso files using mc there are at least two workarounds:

1. Make changes in the "iso9660" file which comes with mc. The file resides in the "/usr/libexec/mc/extfs.d" directory. I suggest not to alter system-wide settings but to put the modified file in the ~/.local/share/mc/extfs.d directory. Here is a quick and dirty patch (no guarantee it works in every case)

Code:

--- iso9660     2016-03-26 19:38:49.000000000 +0100
+++ iso9660.lp1 2016-06-21 21:33:34.573828488 +0200
@@ -135 +135 @@
-    $ISOINFO -l -i "$1" 2>/dev/null | gawk -v SEMICOLON=$SEMICOLON '
+    $ISOINFO -l -i "$1" 2>/dev/null | gawk '{if ($1*1 >0){ss=index($0,$2);sa=substr($0,ss);print sa} else {print $0}}' |  gawk -v SEMICOLON=$SEMICOLON '

2. Install xorriso package from Alien BOB's repository. Note that opening iso files (especially large ones) is much slower in this case.