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setup fails: mount: operation completed successfully


I started a vanilla install on a Dell C400 laptop, running XP.
I chose to install to the C drive.
I started installing from a 4-month old local stable snapshot, 
and cancelled Setup when I realised I'd chosen the old mirror.
I started installing again, from our local latest snapshot.
Note: both Stable and Latest mirror md5 checksums show all is correct.

At the 99% complete stage of "Downloading...", I got a panel titled "mount"
with text:

    The operation completed successfully.

After clicking OK, setup exited instantly, with errorlevel 0.
Looking into the registry, "HKCU/Software/Cygnus Solutions" contains just
the "mounts v2" key with no value.
HKLM/SOFTWARE contains no "Cygnus*" registry key.

Next run of setup showed that it had not recorded the choices for "Install for",
"Default Text File Type", "Local Package Directory", connection type, nor
mirror site.
Is it normal while setup.exe checks all the MD5 signatures on the local
drive, that between the text "Checking MD5 for <package name>" and the
progress bar for the MD5 check for that package, that there are two lines
of text that read:

	setup.bz2
	14% (2k/86k) 1228.8kb/s

Wasn't setup.bz2 downloaded and read before the MD5 checks could commence?
Is this an indication that something weird is going on?

Another odd thing is that the MD5 check is slower than the initial download
from our internal mirror.

Another odd thing is that there is no *overall* progress indicator for the
MD5 check stage: the only progress bar that is used is the top one labelled
"Progress:" - the one labelled "Total:" stays empty throughout the entire,
lengthy MD5 check.  (The one labelled "Disk:" stays empty since nothing is
being installed to the disc, obviously.)

Anyway, the attempt to run setup a second time then failed with a different
alert panel labelled "mount".  This one appeared while setup was displaying
"Checking MD5 for _update-info-dir-00230-1", Progress bar was full, Total
bar was empty, and Disk bar was about 20% across.  This alert panel displayed
the message:

    Cannot create a file when that file already exists.

Clicking on OK made setup.exe exit immediately, again, also with an
errorlevel of 0.

However, when setup.exe was run again (the 3rd time), it had remembered the
"Local Package Directory" and the "Download Site" settings (but no
others).

This 3rd run of setup proceeded as the 2nd did, except the text above the
progress bars said:

	setup.bz2
	0% (0k/86k) 0.0kb/s

and ran very fast - perhaps 20 times faster than the previous MD5 check.
But setup also failed in exactly the same way as the previous one.

Deleting all mentions of Cygnus from the registry, and all the partial
files from the disc (including the download area), and re-running setup
a 4th time failed at the 99% complete stage of "Downloading...", while
downloading _update-info-dir-00230-1.  The alert panel this time was
titled "Cygwin Setup" and said "Download incomplete.  Try again?" with
a Yes and a No button.  Clicking on Yes quickly lead to the same error
as the 1st attempt, except it was at the 0% stage not the 99% stage of
the cygwin setup (according to setup's title bar):

I got a panel titled mount with text:

    The operation completed successfully.

Any suggestions?  This time I was doing nothing odd that might have
provoked Cygwin, AFAIK.

Are all the files on a Cygwin release checksummed?  Or is it just the
package files?  Could this be caused by a download or mirror error on
some non-package file (update-info-dir, foir example?)

luke



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