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Message-ID: <147b7b20-05fd-4708-8f98-4628bf6ea958@gmail.com>
Date: Sat, 7 Sep 2024 11:15:57 +0300
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To: cygwin AT cygwin DOT com
Subject: remount a subfolder on /cygdrive/c with notexec
From: ilya Basin via Cygwin <cygwin AT cygwin DOT com>
Reply-To: ilya Basin <basinilya AT gmail DOT com>
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Sender: "Cygwin" <cygwin-bounces~archive-cygwin=delorie DOT com AT cygwin DOT com>

Hi. I want to speed-up access to Google Drive from Cygwin and I want to disable ReadFile when files are statted.

I did the following:

mkdir /cygnotexec
mount -obind,notexec "/cygdrive/c/ClusterStorage/gdrive/blahblah AT gmail DOT com" "/cygnotexec/basinilya AT gmail DOT com"
mount -obind,notexec "/cygdrive/c/ClusterStorage/gdrive/blahblah AT gmail DOT com" "/cygdrive/c/ClusterStorage/gdrive/basinilya AT gmail DOT com"

Never mind "C:\ClusterStorage\": it's a global antivirus exception maintained by my company. This is why I have configured Google Drive to not use g:\

So when I bind mount to a new location and do 'stat *' there, the SysInternals procmon shows no "ReadFile" calls, but if I repeat that in the original location it shows "ReadFile" for every file.

`mount` prints that "notexec" is enabled at both, but it's only effective in the new location.

Also, `df` sees that the mount is different and prints the available space for Google Drive correctly, but Cygwin doesn't treat it as NFS and doesn't imply "notexec". Should it?

$ mount
C:/ClusterStorage/gdrive/blahblah AT gmail DOT com on /cygdrive/c/ClusterStorage/gdrive/blahblah AT gmail DOT com type vfat (binary,notexec,user,bind)
C:/ClusterStorage/gdrive/blahblah AT gmail DOT com on /cygnotexec/blahblah AT gmail DOT com type vfat (binary,notexec,user,bind)


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