[parted-devel] commit_to_os() and need for wait_for_dev_to_appear

[Jim Meyering]

Curtis Gedak wrote:
> Recently I have noticed a new need arise on the parted mailing lists.
> This is the need for a "wait_for_dev_to_appear" feature.
>
> Would it be prudent to add this functionality to libparted?
> If not, then the users (scripts and programs) of parted and libparted
> will need to duplicate this functionality.
>
> With parted-1.8.8 and earlier, there did not seem to be a need for
> this feature.  After commit_to_os() was called, both the kernel and
> the device entries would reflect the changes to the partition table.
> It is possible that this was a side effect of the commit_to_os()
> function.  Perhaps this would be a good candidate location to include
> the "wait_for_dev_to_appear" check?

Thanks for bringing this up.

I suppose this could be due to changes in udev, the kernel, or parted,
but if someone can investigate/fix it in parted (cleanly and without too
much cost), I would welcome the contribution.
I won't have much time for parted in the next two months.

> Following are the posts that identify the need for "wait_for_dev_to_appear":
>
> How best to wait for partition table kernel reload?
> http://lists.gnu.org/archive/html/bug-parted/2010-06/msg00006.html
>
> [PATCH 3/3] tests: update resize-fs to use wait_for_dev_to_appear_
> http://lists.alioth.debian.org/pipermail/parted-devel/2010-June/003702.html