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Subject: Re: Can I move Cygwin and Cygwin64 to a drive other than C: ?
To: cygwin AT cygwin DOT com
references: <mfga42$ee7$1 AT ger DOT gmane DOT org> <20150401084752 DOT GN13285 AT calimero DOT vinschen DOT de> <mfilln$eq0$1 AT ger DOT gmane DOT org> <20150402081749 DOT GF13285 AT calimero DOT vinschen DOT de> <CAB+hQJ7DxJ6Qye4r395Dpu+emBxnyQeZvXa56yv+iwr3UsDH=A AT mail DOT gmail DOT com> <9784082 DOT 20150404215218 AT yandex DOT ru>
From: LRN <lrn1986 AT gmail DOT com>
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Date: Sat, 4 Apr 2015 23:42:28 +0300
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On 04.04.2015 21:52, Andrey Repin wrote:
> Greetings, Eric Pement!
>=20
>> Follow-up question for Corinna or anyone who might know the answer:
>=20
>>>> On Apr  1 03:26, Robert Miles wrote:
>>>>>> Can I move the entire Cygwin and Cygwin64 directory trees to one
>>>>>> of the nearly empty drives, without losing the extra packages I've
>>>>>> already downloaded and the files I've created?
>>>>>
>>>>> Robocopy allows to copy an entire Cygwin tree while keeping all
>>>>> permissions intact.  I had good luck with something along the
>>>>> lines of
>>>>>
>>>>>   robocopy C:\cygwin64 D:\cygwin64 /e /purge /z /copyall /sl
>> . . .
>> With an added comment that
>>> I *did* move Cygwin installations using
>>> robocopy and the above works for me.  In an elevated shell.
>=20
>> I recently needed to move a Cygwin installation, about 6 GB, to
>> another drive accessible only on a network file system. Due to the
>> number of files, copying everything would have taken a week or more,
>> because everything slows down when the number of files increases.
>=20
>> The solution I ultimately took was not the best. I compressed
>> everything into a single *.7z (7-zip) archive, moved the single
>> archive across the network, and uncompressed the *.7z archive on the
>> target machine.
>=20
>> Although the total time was much, much faster (maybe 5 or 6 hours,
>> including 30 minutes to uncompress the archive), all my file
>> permissions were set to the same value, regardless of what they had
>> been previously, and any extended attributes were lost entirely.
>=20
>> I didn't like it, but I had no realistic alternative.
>=20
>> For future resource, what is the best way to archive a Cygwin
>> installation into a single file, which will preserve all file
>> properties and permissions, so that the archive can be transferred to
>> another location? (For the sake of clarity, presume that Cygwin does
>> NOT exist in the target location, so a non-Cygwin tool must be used to
>> expand the archive.)
>=20
> About any sane modern archiving tool can read TAR archives.
> And most of them understand gz/xz/bz2 compression.
> You could have used any of that to unpack Cygwin to get a bootstrap
> environment, then use that environment to unpack the tar with all permisi=
sons
> restored.

Agreed. I do this regularly (for a different reason), and all you need is a
small subset of Cygwin that can support tar and gz/bz2/xz/whatever you use =
to
compress the files. My subset is 21 megabytes when uncompressed; in your ca=
se
it can be much smaller, as i also have wget and its dependencies, and i'm
forming that subset automatically by unpacking packages (which means a lot =
of
unneeded files are installed). You may need to run some kind of chown/chmod
combo after unpacking that subset.

Another interesting scenario is to use icacls to save ACLs of files, then u=
se
it on target machine to restore them.

Also, you can just *install* a minimal set of Cygwin packages on the target
machine normally.



--=20
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