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device-helper: update docs

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illiliti 2021-05-10 14:34:51 +03:00
parent 61e9112142
commit 654a787074
1 changed files with 4 additions and 1 deletions
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device-helper
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@ -14,6 +14,7 @@ create_symlink()
ln -s "../../${dev_name}" "$sym" ln -s "../../${dev_name}" "$sym"
} }
# DEVPATH is part of uevent which is exported to environment by device manager.
[ -b "/dev/${dev_name=${DEVPATH##*/}}" ] || exit 1 [ -b "/dev/${dev_name=${DEVPATH##*/}}" ] || exit 1
exec > /dev/null 2>&1 exec > /dev/null 2>&1
@ -25,7 +26,9 @@ read -r dm_name < "/sys/block/${dev_name}/dm/name" && {
command -v blkid || exit 0 command -v blkid || exit 0
# prevent race condition # Race condition may occur if uevent arrives faster(isn't that a kernel bug!?)
# than the kernel initializes device. This prevents blkid to fetch data from
# device. To fix this, we simply waiting until blkid is succeeded.
while ! blkid "/dev/${dev_name}"; do while ! blkid "/dev/${dev_name}"; do
if [ "$((count += 1))" = 30 ]; then if [ "$((count += 1))" = 30 ]; then
exit 1 exit 1