bug#25286: cow-store destroys /tmp

bug#25286: cow-store destroys /tmp

[John Darrington]

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1. Boot from an installation-os image.
2. cp /etc/issue /tmp
3. ls -l /tmp    [observe that /tmp/issue exists]
4. mount -t ext4 /dev/sda1 /mnt
5. herd start cow-store /mnt
6. ls -l /tmp  [observe that /tmp/issue has dissappeared]

J'

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bug#25286: cow-store destroys /tmp

[Ludovic Courtès]

John Darrington <john@darrington.wattle.id.au> skribis:

> 1. Boot from an installation-os image.
> 2. cp /etc/issue /tmp
> 3. ls -l /tmp    [observe that /tmp/issue exists]
> 4. mount -t ext4 /dev/sda1 /mnt
> 5. herd start cow-store /mnt
> 6. ls -l /tmp  [observe that /tmp/issue has dissappeared]

Indeed, ‘cow-store’ bind-mounts /mnt/tmp (or whatever the target mount
point is) to /tmp to make sure we have enough disk space if we need to
build things.  This was done in commit
0adabad72d58492f08975af0b6b837ebde32a51b in response to a bug report.

Is it a problem for the installer?

Thanks,
Ludo’.

bug#25286: cow-store destroys /tmp

[John Darrington]

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On Mon, Jan 02, 2017 at 09:44:46PM +0100, Ludovic Court??s wrote:
     John Darrington <john@darrington.wattle.id.au> skribis:
     
     > 1. Boot from an installation-os image.
     > 2. cp /etc/issue /tmp
     > 3. ls -l /tmp    [observe that /tmp/issue exists]
     > 4. mount -t ext4 /dev/sda1 /mnt
     > 5. herd start cow-store /mnt
     > 6. ls -l /tmp  [observe that /tmp/issue has dissappeared]
     
     Indeed, ???cow-store??? bind-mounts /mnt/tmp (or whatever the target mount
     point is) to /tmp to make sure we have enough disk space if we need to
     build things.  This was done in commit
     0adabad72d58492f08975af0b6b837ebde32a51b in response to a bug report.
     
     Is it a problem for the installer?
     

It's not an insurmountable problem.  But it is a bit annoying.

J'

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