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rootfs-wip
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fix unmount issus when dir is not mount #1

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Izimic wants to merge 1 commits from Izimic/rootfs-wip:master into master
pull from: Izimic/rootfs-wip:master
merge into: Seltcana:master
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src/main.cr
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@ -234,7 +234,7 @@ class RootFS::RootFS
def unmount(directory = nil)
if directory
execute "umount '#{@directory}/#{directory}'"
execute "mountpoint -q '#{@directory}/#{directory}' || exit 0 && umount '#{@directory}/#{directory}'"
return
end