Mail Archives: cygwin/2003/11/06/18:51:58
I now have a procedure that works on my system for allowing more than
one cygwin to exist on the same Windows instance at the same time (but
not to execute at the same time). I thank several on this list and who
replied privately for help. For my needs, this solves the problem that
started the thread. Perhaps it can help others.
I have put the full discussion here at
http://www.tinyvital.com/techblog/archives/000330.html#more.
Also, part of it follows below (minus the nice HTML formatting):
--------------------------------------------------------------------------
NOTE: This will not allow both Cygwin environments to operate at the
same time, but it will allow one to switch back and forth without
rebooting the Windows OS. I am running this on Windows2000, but it
should work on any modern Windows OS.
If you follow this procedure and have problems, please DO NOT BOTHER the
Cygwin maintainers, as they will NOT answer your questions. Multiple
Cygwins are outside of their current charter.
The approach is based on the following known or suspected cygwin
characteristics:
...cygwin conflicts occur if cygwin discovers that there are more than
one cygwin1.dll's on your machine
...Cygwin keeps its file system mount point information in the registry.
...It appears to discover duplicate cygwins if the "wrong" dll is in the
Windows DLL path, if the "wrong" one is pointed to by a mount point, or
if there is a cygwin shared memory segment (always present when a cygwin
app is running). I am not sure this is exactly right, but it is
consistent with my observations. In any case, the following procedure
does work for me.
.................
First, perform the following steps [Standard warning. I am not
responsible if this screws up your system, and if you are going to mess
with the registry, you should know what you are doing. Read the whole
procedure before starting.]:
...Remove the current cygwin installation if there is one (you may want
to copy all or parts of the installation to another area).
...Make sure no keys exist in the registry named "cygwin" by deleting
them and the appropriate parent if necessary - ("Cygnus Solutions."). It
may not be necessary to mess with the registry, but I did. If it make
you nervious, try without it. One alternative that may be sufficient is
issuing the cygwin command "umount -A" - obviously before you delete
your cygwin!
...Install cygwin in the normal fashion. In my case, against Cygwin
recommendations, I install it in "C:/".
...Choose a directory for the switch scripts. Mine is c:/localbin -
which is used for the rest of the example.
...Start a cygwin shell and issue the following command:"
mount -m >c:/localbin/mount-std
This will save the mount information from the registry into a
script.
...Edit the script so that each mount command is an absolute windows
style path to the mount binary for the non-standard cygwin mount.exe
that will be installed in a later step. The absolute path is necessary
or some mount commands will fail once the root mount path is changed.
See the example scripts below.
...Exit ALL cygwin applications (and terminate the cygipc service or
other daemon if they are running). This will make the shared memory
segment go away.
...Issue the following command to hide the current cygwin installation
from the new one to be installed:
umount -A
...Install the new cygwin, but NOT with the same cygwin root directory
as the "standard" one. I installed mine on H:/cygwin. This may or may
not be an option on the distributed software.
...Start a shell from the new cygwin (to make the other script):
...mount -m >c:/localbin/mount-ven
...Edit the script so that each mount command is an absolute windows
style path to the mount binary for the standard cygwin mount.exe.
----------------------------------------------------------------------
Now, if you are running in the non-standard cygwin environment, to
switch to the standard environment:
...Stop all cygwin programs (including daemons) except one shell.
...In that shell, execute the mount-std script as follows (at least for
my system):
. c:/localbin/mount.std
...Exit from that shell
At this point you can run applications from the standard cygwn. BE
CAREFUL not to run any applications from the other cygwin or things will
get and stay screwed up until you end all running cygwin applications!
If you are running the the standard cygwin environment, and want to
switch to the non-standard environment, do everything like the previous
procedure, except invoke mount-ven. At that point, you can run anything
from the non-standard environment ONLY (see caution above).
--------------------------------------------------------------------------------
My mount-std script:
mount -f -s -b "M:" "/mnt/cdrom"
mount -f -s -t "c:" "/cygdrive/c"
mount -f -s -t "d:" "/cygdrive/d"
mount -f -s -t "e:" "/cygdrive/e"
mount -f -s -t "f:" "/cygdrive/f"
mount -f -s -t "g:" "/cygdrive/g"
mount -f -s -t "h:" "/cygdrive/h"
mount -f -s -t "i:" "/cygdrive/i"
mount -f -s -t "u:" "/cygdrive/u"
mount -f -s -t "v:" "/cygdrive/v"
mount -f -s -t "w:" "/cygdrive/w"
h:/cygwin/bin/mount -f -s -b "C://bin" "/usr/bin"
h:/cygwin/bin/mount -f -s -b "C:/usr/X11R6/lib/X11/fonts"
"/usr/X11R6/lib/X11/fonts"
h:/cygwin/bin/mount -f -s -b "C://lib" "/usr/lib"
h:/cygwin/bin/mount -f -s -b "C:" "/"
h:/cygwin/bin/mount -s -b --change-cygdrive-prefix "/cygdrive"
--------------------------------------------------------------------------------
My mount-ven script:
mount -f -s -b "M:" "/mnt/cdrom"
mount -f -s -t "c:" "/cygdrive/c"
mount -f -s -t "d:" "/cygdrive/d"
mount -f -s -t "e:" "/cygdrive/e"
mount -f -s -t "f:" "/cygdrive/f"
mount -f -s -t "g:" "/cygdrive/g"
mount -f -s -t "h:" "/cygdrive/h"
mount -f -s -t "i:" "/cygdrive/i"
mount -f -s -t "u:" "/cygdrive/u"
mount -f -s -t "v:" "/cygdrive/v"
mount -f -s -t "w:" "/cygdrive/w"
c:/bin/mount.exe -f -s -b "H:/cygwin/lib" "/usr/lib"
c:/bin/mount.exe -f -s -b "H:/cygwin" "/"
c:/bin/mount.exe -s -t --change-cygdrive-prefix "/cygdrive"
c:/bin/mount.exe -f -s -b "H:/cygwin/bin" "/usr/bin"
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