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An alternative to booting to external media, etc, would be a bind |
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mount of / and /usr on separate temporary mount points, then dumping |
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the data between them, leaving the existing system chugging along. A |
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re-mount of the current /usr in -o ro mode might not be a terrible |
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idea in that case. I had a good bit of luck going that route. A simple |
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"cp -a" did the trick on the one system I've bothered with it on so |
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far. I have a couple laptops that're rushing headlong into unsupported |
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land right now though, so I'll be revisiting this soon enough. |
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As for specifics: |
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# Make the temporary working areas |
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mkdir /tmp/a; mkdir /tmp/b |
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# Make sure nothing changes in /usr while the copy is done |
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mount -o remount,ro /usr |
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# Mount a mirror of the source and destination filesystems |
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mount --bind /usr/ /tmp/a |
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mount --bind / /tmp/b |
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# And now, copy. |
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cd /tmp/a |
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cp -a ./ /tmp/b/usr/ |
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|
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The one big point of what not to do would be "mount --rbind". Very |
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important (recursive bind would have the current /usr still visible in |
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/tmp/b/usr/). |
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|
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After all that, comment out /usr in fstab and reboot. You *could* even |
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just drop to a minimal runlevel that doesn't require /usr, unmount the |
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old one and then jump back to your standard runlevel, but due to the |
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reasons this is required now, I'm not entirely sure that option exists |
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anymore (i.e. too much is dependent on /usr). |
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That said, if you are booting to a LiveDVD -- |
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On Mon, Dec 2, 2013 at 1:58 PM, Tanstaafl <tanstaafl@×××××××××××.org> wrote: |
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> On 2013-12-02 1:47 PM, Thanasis <thanasis@××××××××××.org> wrote: |
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>> |
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>> on 12/02/2013 04:02 PM Tanstaafl wrote the following: |
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>>> |
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>>> |
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>>> So, here's the plan, please check me... |
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>>> |
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>>> 1. Boot off of the latest gentoo LiveDVD |
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>> |
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>> |
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>> If you boot a different system to do the rsync, or, if you do it over |
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>> ssh, add the option --numeric-ids |
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> |
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> |
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> Thanks, but no, like I said, I'll just boot that system to a LiveDVD and do |
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> it from there... |
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|
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That actually does fall under "boot a different system" since the |
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users won't line up between a LiveDVD and your actual system. |
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|
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-- |
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Poison [BLX] |
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Joshua M. Murphy |
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