Snapshots:Example: Difference between revisions

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Note that in this example, the directory ".snapshots" could also be ".zfs/snapshot" or "ifs/.snapshot/" depending on the filer serving your host. You can try to 'ls' one and if it doesn't exist try the other.
Note that in this example, the directory '''.snapshot''' could also be '''.zfs/snapshot''' depending on the filer serving your host. You can try to <code>ls -l</code> one and if it doesn't exist, try the other.


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Changing to my virtual environment directory.
For this example, the user is logged into '''host''' with the username '''username''', and a virtual environment directory named '''virtualenv''' exists in the home directory.
 
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ pwd
username@host:~/virtualenv$ pwd
/nfshomes/sattwood/virtualenv
/nfshomes/username/virtualenv
</pre>
</pre>
I see that I have a python file called  '''virtualenv.py'''.
 
A Python file named '''virtualenv.py''' exists in the directory.
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ ls
username@host:~/virtualenv$ ls
appveyor.yml  bin              docs        MANIFEST.in  scripts    setup.py tox.ini              virtualenv.py
appveyor.yml     docs        scripts    tox.ini
AUTHORS.txt  CONTRIBUTING.rst LICENSE.txt README.rst  setup.cfg  tests     virtualenv_embedded  virtualenv_support
AUTHORS.txt      LICENSE.txt setup.cfg  virtualenv_embedded
bin              MANIFEST.in  setup.py   virtualenv.py
CONTRIBUTING.rst  README.rst  tests     virtualenv_support
</pre>
</pre>
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ ls -lah virtualenv.py
username@host:~/virtualenv$ ls -lah virtualenv.py
-rwxrwxr-x. 1 sattwood sattwood 98K Jun 12 13:54 virtualenv.py
-rwxrwxr-x. 1 username username 98K Jun 12 13:54 virtualenv.py
</pre>
</pre>
I will remove it from the current file system.
 
Remove it from the current working directory.
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ rm virtualenv.py
username@host:~/virtualenv$ rm virtualenv.py
</pre>
</pre>
As you can see it no longer is there.
 
Verify that the file is removed.
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ ls
username@host:~/virtualenv$ ls
appveyor.yml  bin              docs        MANIFEST.in  scripts    setup.py tox.ini             virtualenv_support
appveyor.yml  CONTRIBUTING.rst  MANIFEST.in  setup.cfg tox.ini
AUTHORS.txt  CONTRIBUTING.rst  LICENSE.txt  README.rst  setup.cfg  tests     virtualenv_embedded
AUTHORS.txt  docs              README.rst  setup.py  virtualenv_embedded
bin          LICENSE.txt      scripts      tests     virtualenv_support
</pre>
</pre>
I am going to go into the most recent hourly snapshot, in this case: '''hourly_2018_06_15__12_00'''
 
Change directory into the most recent weekly snapshot.  In this case, it's '''Weekly_nfshomes_2024-06-23_00:00'''.
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ ls /nfshomes/sattwood/.snapshots
username@host:~/virtualenv$ ls /nfshomes/username/.snapshot
daily_2018_06_13__00_00 hourly_2018_06_14__04_00 hourly_2018_06_14__16_00 hourly_2018_06_15__08_00
nfshomes_2024-06-25_00:00 nfshomes_2024-06-27_04:00
daily_2018_06_14__00_00 hourly_2018_06_14__08_00 hourly_2018_06_14__20_00  hourly_2018_06_15__12_00
nfshomes_2024-06-26_00:00 nfshomes_2024-06-27_08:00
daily_2018_06_15__00_00  hourly_2018_06_14__12_00  hourly_2018_06_15__04_00  weekly_2018_06_09__00_00
nfshomes_2024-06-26_12:00 nfshomes_2024-06-27_12:00
nfshomes_2024-06-26_16:00 Weekly_nfshomes_2024-06-16_00:00
nfshomes_2024-06-26_20:00 Weekly_nfshomes_2024-06-23_00:00
nfshomes_2024-06-27_00:00
</pre>
</pre>
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ cd /nfshomes/sattwood/.snapshots/hourly_2018_06_15__12_00/virtualenv
username@host:~/virtualenv$ cd /nfshomes/username/.snapshot/Weekly_nfshomes_2024-06-23_00\:00/virtualenv
</pre>
</pre>
As you can see the file is still here.
 
The file still exists in the snapshot.
<pre>
<pre>
sattwood@zaphod:~/.snapshots/hourly_2018_06_15__12_00/virtualenv$ ls
username@host:~/.snapshot/Weekly_nfshomes_2024-06-23_00:00/virtualenv$ ls
appveyor.yml  bin              docs        MANIFEST.in  scripts    setup.py tox.ini              virtualenv.py
appveyor.yml     docs        scripts    tox.ini
AUTHORS.txt  CONTRIBUTING.rst LICENSE.txt README.rst  setup.cfg  tests     virtualenv_embedded  virtualenv_support
AUTHORS.txt      LICENSE.txt setup.cfg  virtualenv_embedded
bin              MANIFEST.in  setup.py   virtualenv.py
CONTRIBUTING.rst  README.rst  tests     virtualenv_support
</pre>
</pre>
I copy it back to the original directory.
 
Copy the file back to the original directory.
<pre>
<pre>
sattwood@zaphod:~/.snapshots/hourly_2018_06_15__12_00/virtualenv$ cp virtualenv.py /nfshomes/sattwood/virtualenv/
username@host:~/.snapshot/Weekly_nfshomes_2024-06-23_00:00/virtualenv$ cp virtualenv.py /nfshomes/username/virtualenv/
</pre>
</pre>
Change back to the original directory.
Change back to the original directory.
<pre>
<pre>
sattwood@zaphod:~/.snapshots/hourly_2018_06_15__12_00/virtualenv$ cd /nfshomes/sattwood/virtualenv/
username@host:~/.snapshot/Weekly_nfshomes_2024-06-23_00:00/virtualenv$ cd /nfshomes/username/virtualenv/
</pre>
</pre>
And it is back.
 
Confirm that the file is restored from the snapshot.
<pre>
<pre>
sattwood@zaphod:~/virtualenv$ ls
username@host:~/virtualenv$ ls
appveyor.yml  bin              docs        MANIFEST.in  scripts    setup.py tox.ini              virtualenv.py
appveyor.yml     docs        scripts    tox.ini
AUTHORS.txt  CONTRIBUTING.rst LICENSE.txt README.rst  setup.cfg  tests     virtualenv_embedded  virtualenv_support
AUTHORS.txt      LICENSE.txt setup.cfg  virtualenv_embedded
bin              MANIFEST.in  setup.py   virtualenv.py
CONTRIBUTING.rst  README.rst  tests     virtualenv_support
</pre>
</pre>


[[Category:Snapshots]]
[[Category:Snapshots]]
__NOTOC__
__NOTOC__

Latest revision as of 20:01, 16 September 2024

Note that in this example, the directory .snapshot could also be .zfs/snapshot depending on the filer serving your host. You can try to ls -l one and if it doesn't exist, try the other.

For this example, the user is logged into host with the username username, and a virtual environment directory named virtualenv exists in the home directory. 

username@host:~/virtualenv$ pwd
/nfshomes/username/virtualenv

A Python file named virtualenv.py exists in the directory. 

username@host:~/virtualenv$ ls
appveyor.yml      docs         scripts    tox.ini
AUTHORS.txt       LICENSE.txt  setup.cfg  virtualenv_embedded
bin               MANIFEST.in  setup.py   virtualenv.py
CONTRIBUTING.rst  README.rst   tests      virtualenv_support

username@host:~/virtualenv$ ls -lah virtualenv.py
-rwxrwxr-x. 1 username username 98K Jun 12 13:54 virtualenv.py

Remove it from the current working directory. 

username@host:~/virtualenv$ rm virtualenv.py

Verify that the file is removed. 

username@host:~/virtualenv$ ls
appveyor.yml  CONTRIBUTING.rst  MANIFEST.in  setup.cfg  tox.ini
AUTHORS.txt   docs              README.rst   setup.py   virtualenv_embedded
bin           LICENSE.txt       scripts      tests      virtualenv_support

Change directory into the most recent weekly snapshot. In this case, it's Weekly_nfshomes_2024-06-23_00:00. 

username@host:~/virtualenv$ ls /nfshomes/username/.snapshot
nfshomes_2024-06-25_00:00  nfshomes_2024-06-27_04:00
nfshomes_2024-06-26_00:00  nfshomes_2024-06-27_08:00
nfshomes_2024-06-26_12:00  nfshomes_2024-06-27_12:00
nfshomes_2024-06-26_16:00  Weekly_nfshomes_2024-06-16_00:00
nfshomes_2024-06-26_20:00  Weekly_nfshomes_2024-06-23_00:00
nfshomes_2024-06-27_00:00

username@host:~/virtualenv$ cd /nfshomes/username/.snapshot/Weekly_nfshomes_2024-06-23_00\:00/virtualenv

The file still exists in the snapshot. 

username@host:~/.snapshot/Weekly_nfshomes_2024-06-23_00:00/virtualenv$ ls
appveyor.yml      docs         scripts    tox.ini
AUTHORS.txt       LICENSE.txt  setup.cfg  virtualenv_embedded
bin               MANIFEST.in  setup.py   virtualenv.py
CONTRIBUTING.rst  README.rst   tests      virtualenv_support

Copy the file back to the original directory. 

username@host:~/.snapshot/Weekly_nfshomes_2024-06-23_00:00/virtualenv$ cp virtualenv.py /nfshomes/username/virtualenv/

Change back to the original directory. 

username@host:~/.snapshot/Weekly_nfshomes_2024-06-23_00:00/virtualenv$ cd /nfshomes/username/virtualenv/

Confirm that the file is restored from the snapshot. 

username@host:~/virtualenv$ ls
appveyor.yml      docs         scripts    tox.ini
AUTHORS.txt       LICENSE.txt  setup.cfg  virtualenv_embedded
bin               MANIFEST.in  setup.py   virtualenv.py
CONTRIBUTING.rst  README.rst   tests      virtualenv_support
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