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[union-mount] Rescan dev if root partition disapear (#298)

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On some platforms after the initramfs init scripts have mounted the root device its
block device disapear from /dev. The union-mount script therefore can't mount the
root device over the aufs. If this case happen, issue a rescan of the devices to
repopulate the /dev filesystem.
This commit is contained in:
Samuel Angebault 2017-02-15 23:18:02 -08:00 committed by lguohan
parent 877291ae91
commit 89a695a5e7
1 changed files with 2 additions and 0 deletions
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files/initramfs-tools/union-mount.j2
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@ -8,6 +8,8 @@ esac
## Mount the aufs file system: rw layer over squashfs ## Mount the aufs file system: rw layer over squashfs
mkdir -p ${rootmnt}/host/rw mkdir -p ${rootmnt}/host/rw
mount -n -o dirs=${rootmnt}/host/rw:${rootmnt}=ro -t aufs root-aufs ${rootmnt} mount -n -o dirs=${rootmnt}/host/rw:${rootmnt}=ro -t aufs root-aufs ${rootmnt}
## Check if the root block device is still there
[ -b ${ROOT} ] || mdev -s
## Mount the raw partition again ## Mount the raw partition again
mount ${ROOT} ${rootmnt}/host mount ${ROOT} ${rootmnt}/host
## Mount the working directory of docker engine in the raw partition, bypass the aufs ## Mount the working directory of docker engine in the raw partition, bypass the aufs