add (restore) <file> command to 'backup'

[endofzero]

add (restore) command to 'backup'

add ability into the backup command to automate restoration of a backup file.

maybe start including a small hash to the filenames for easy picking, or just use full filenames.

A hard replace should really do the job in either incremental or full backups...

Incremental restores might be tricky though, could find a way to automate the iteration of in-between incremental if done that way. Pretty sure you would be required to restore incremental backups in order from newest to the time you are going for.

[demonspork]

actually, an incremental is only the differences from the last full backup, previous incrementals aren't even considered, so you just need to restore the full backup and the latest incremental.

[demonspork]

mv $MC_PATH/world $MC_PATH/world-replacedbybackup
cd $MC_PATH
tar -xvf $BACKUP_FULL_LINK
tar -xvf $BACKUP_INCR_LINK

and voila, you have a functional world from the latest backup. Needs some other stuff of course for handling as "minecraft.sh restore" but you get the idea. Also generating a list of possible incremental and full backup restore dates would be nice, so you can do "minecraft.sh restore list" and get a list of dates and times available for restoring and then use "minecraft.sh restore 2010-12-26-16h20" or even when you list out the possible backups you number them like this:
1. 2010-12-26-16h20
2. 2010-12-26-17h20
3. 2010-12-26-18h20
4. 2010-12-26-19h20
5. 2010-12-26-20h20
and choose the backup with
minecraft restore #3
or
minecraft restore 2010-12-26-18h20

My bash skills are a little bit limited, but I will give this my best shot and see if I can get some or all of this done and you can use that, but if you are going to do it, please tell me so I don't waste time doing it like I did on the sync and lockfiles.

[endofzero]

:( sorry about the sync and lockfiles... when i get a programming idea in my head... I just kinda run with it...

You can take this on, if you want. I'd be glad to merge any pulls you come up with.

[demonspork]

I know what you mean, I sometimes forget to sleep when I am stupid enough to think all the way through to the end of a project. I am more familiar with Perl, C# and C++ though, I sometimes get stuck in Bash because of knowledge limitations.

Now to figure out how pull requests work.

[demonspork]

I don't know enough about manipulating strings in bash yet to make myself a list of backups so I am going to have to say that I can't do this yet. But I thought of a change to my original proposal that could be important:

cd $MC_PATH/backuprestore
tar -xvf $BACKUP_FULL_LINK
tar -xvf $BACKUP_INCR_LINK
mv $MC_PATH/$WORLD_NAME $MC_PATH/${WORLD_NAME}-replaced_by_backup
mv $MC_PATH/backuprestore/$WORLD_NAME $MC_PATH/$WORLD_NAME

this makes sure that no "sync" commands attempt to make a copy of a partially extracted world. It may even be better to add a lockfile to the sync command and use the lockfile for the sync command while running the restore command.

[endofzero]

I think we should keep it simple and keep with the lockfile check for that...

[dopeghoti]

I'm going to tackle proper locking for backups right now, followed by work on the restore functionality.

[endofzero]

yeah... not sure what my initial thoughts were... but it may be worth considering making it it's own function as opposed to it being tacked onto backup... so
./minecraft.sh restore 2010-01-05-02h32

or something...
seems better to do it that way then something like:
./minecraft.sh backup restore 2010-01-05-02h32

, but either should do just fine.
just figured i would throw that idea out there as separating it like that should allow for greater ease for improvement or adjustment without affecting the already-known-to-be-working backup function.

[dopeghoti]

Indeed, I was planning on making restore its own command.