On 11/18/2009 09:13 PM, Peter Jones wrote:
On 11/18/2009 01:47 PM, Karel Zak wrote:
I think dracut guys should be in CC. Any objection against this change?
On Wed, Nov 18, 2009 at 03:33:12PM +0000, Daniel Drake wrote:
This reverts commit a692a8745941a192528c5e2a05de97155ba586f9.
Booting into a system this way just leads to problems because
you cannot remount the root read-only at shutdown (leading to unclean
shutdowns).
Miklos Szeredi pointed out a trick to turn any directory into a
mount point which avoids this problem. Therefore we can simplify
switch_root again and simply document that its users should set
up the root as a mount point beforehand.
---
sys-utils/switch_root.8 | 13 +++++++
sys-utils/switch_root.c | 81 +++--------------------------------------------
2 files changed, 18 insertions(+), 76 deletions(-)
diff --git a/sys-utils/switch_root.8 b/sys-utils/switch_root.8
index 4fdc8e9..b6712ec 100644
--- a/sys-utils/switch_root.8
+++ b/sys-utils/switch_root.8
@@ -32,6 +32,19 @@ show version number and exit
.B switch_root
returns 0 on success and 1 on failure.
+.SH NOTES
+switch_root will fail to function if
+.B newroot
+is not the root of a mount. If you want to switch root into a directory that
+does not meet this requirement then you can first use a bind-mounting trick to
+turn any directory into a mount point:
+.sp
+.nf
+.RS
+mount --bind $DIR $DIR
Cannot we add this functionality directly to the switch_root command?
I mean call:
mount --bind /newroot/subroot /newroot/subroot
mount --move /newroot/subroot /
Now we have:
mount --move newroot /
chroot /newroot/subroot
That certainly seems preferable to reverting the patch, especially if, as
the original commit log says, some distro (OLPC in this case) is actually
using this functionality.
no objections
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