libmultipath: limit paths that can get wwid from environment · Pull Request !201 · src-openEuler/multipath-tools

find_multipaths配置为smart时,单路径iscsi盘的udev环境变量DM_MULTIPATH_DEVICE_PATH会被错误地置为1，如果该iscsi盘已存在lv，这会导致lv不会被激活。

具体分析已添加到以下issue的评论区：
#IAIQ7C

sync patch from community: https://github.com/opensvc/multipath-tools/commit/694a29d909268868eb2d855303a0420c2baeffda

Currently, whenever getting the uid_attribute from the udev database
fails, multipath will try to get it from the environment variables. This
normally isn't a problem, since either multipath -u is getting called
from a uevent and the environment will have the correct value in that
variable, or something else is being run and that variable won't be set.
However, when find_multipaths is configured to "smart", this causes
problems. For maybe devices, multipath needs to get the WWIDs of all the
other block devices, to see if they match the maybe device wwid.  If one
of those devices doesn't have uid_attribute set in its udev database,
multipath will fall back to checking the environment for it, and it will
find that variable set to the WWID of the maybe device that this uevent
is for.  This means that all devices with no WWID will end up appearing
to have the same WWID as the maybe device, causing multipath to
incorrectly claim it.

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