Re: [9fans] full fossil follies

["Iruatã Souza" <iru.muzgo@gmail.com>]

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Le ven. 25 juin 2021 à 17:19, <tlaronde@polynum.com> a écrit :

> On Fri, Jun 25, 2021 at 02:12:07PM +0000, adr via 9fans wrote:
> > On Fri, Jun 25, 2021 at 01:41:30PM +0100, Richard Miller wrote:
> > > > it just becomes difficult
> > > > to do anything when no fossil blocks can be allocated
> > >
> > > Thinking a bit further about this: intuitively one might expect to be
> > > able to reboot using a local file system which is completely full, and
> > > use du and ls to find big files and rm to delete them, without the need
> > > to allocate new blocks. Something in the way fossil works, makes this
> > > impossible at present. I wonder how much work it would be to
> investigate
> > > and fix?
> >
> > I haven't studied how fossil works, so excuse this light chat.
> > Couldn't fossil have reserved blocks so when it starts and it's
> > full it can add those block and present the user to a recovery
> > session? Just a console session printing the last file modified?
>
> I don't think I will tell anybody a scoop, but it is what is present in
> traditional Unix filesystems where there is a percent of the storage
> preserved... but for root, user under which you are not supposed to
> log to the system in normal operation. This is probably the problem:
> since there is no privileged user, for "whom" to preserve/reserve these
> blocks?
>
> I imagine the alternative would be, if fossil reports full, that memory
> filesystems should be mounted on top of the system mandatory writable
> dirs so that the system will not block but normal booting will not
> be done but the program launched will be one requiring user to make
> room, crucial infos written in memory filesystems being copied back
> to fossil when done. But it is easier to implement when booting/rebooting,
> but more problematic if the system is running. Except perhaps that
> there will always be a memory filesystem mounted with rescue
> programs/scripts that the user can precisely use when the system
> is out of disk space, utilities that write nothing to disk (but just in
> their memory realm), in order to not paint oneself in a corner.
>

FWIW in 9front you can jump into rc while booting and fix this sort of
issue.


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