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mkdumprd: refine regex on dropping mount options 

Currently we use "\b" (word boundary) as the delimiter for ro option,
which is not correct. For mount options like
"defaults,errors=remount-ro" the ro on the tail will also be replaced
and result in an invalid mount option.

So we use a more strict logic on detecting ro mount option. It should
either starts with "," or "^" (begin of line) and ends with "," or "$"
(end of line), and keep the delimiter untouched. This should ensure
only valid mount option got detected and replaced.

This passed following tests:

defaults,ro,noauto,errors=remount-ro,nobootwait,nofail => defaults,rw,errors=remount-ro,
defaults,errors=remount-ro => defaults,errors=remount-ro
defaults,ro,relatime => defaults,rw,relatime
defaults,ro => defaults,rw

Signed-off-by: Kairui Song <kasong@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
This commit is contained in:
Kairui Song 2019-01-28 13:21:33 +08:00
parent 7f9dd45688
commit 05cec1657f
1 changed files with 5 additions and 5 deletions
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mkdumprd
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@ -106,14 +106,14 @@ to_mount() {
_options=$(echo $_options | sed 's/,clientaddr=[^,]*//')
fi
fi
# mount fs target as rw in 2nd kernel
_options=$(echo $_options | sed 's/\(^\|,\)ro\($\|,\)/\1rw\2/g')
# with 'noauto' in fstab nfs and non-root disk mount will fail in 2nd
# kernel, filter it out here.
_options=$(echo $_options | sed 's/\bnoauto\b//')
#mount fs target as rw in 2nd kernel
_options=$(echo $_options | sed 's/\bro\b/rw/')
_options=$(echo $_options | sed 's/\(^\|,\)noauto\($\|,\)/\1/g')
# drop nofail or nobootwait
_options=$(echo $_options | sed 's/\bnofail\b//')
_options=$(echo $_options | sed 's/\bnobootwait\b//')
_options=$(echo $_options | sed 's/\(^\|,\)nofail\($\|,\)/\1/g')
_options=$(echo $_options | sed 's/\(^\|,\)nobootwait\($\|,\)/\1/g')
_mntopts="$_target $_fstype $_options"
#for non-nfs _dev converting to use udev persistent name