From: Michael Olbrich <m.olbrich@pengutronix.de>
To: ptxdist@pengutronix.de
Subject: Re: [ptxdist] fake-overlayfs
Date: Fri, 9 Oct 2020 15:06:52 +0200 [thread overview]
Message-ID: <20201009130652.GA3084@pengutronix.de> (raw)
In-Reply-To: <20201007223840.GA876287@lenoch>
Hi,
On Thu, Oct 08, 2020 at 12:38:40AM +0200, Ladislav Michl wrote:
> fake-overlayfs help text reads:
> 'fake an overlay filesystem like unionfs by copying the original
> content to a tmpfs.'
>
> However it does not seem to do so. Bellow is attempt to fix that.
> 1) /usr/sbin/fake-overlayfs does not seem to mount tmpfs
> 2) with MountFlags=private is tmpfs mount invisible for the rest of system
> 3) perhaps use /run only with systemd?
So I haven't tested this in a while but what is supposed to happen is this:
You add the tmpfs to the fstab for any directory that should be writable.
Then fake-overlayfs will fill that tmpfs with the content that is hidden
by the tmpfs.
Michael
> Comments welcome,
> ladis
>
> diff --git a/projectroot/usr/lib/systemd/system/fake-overlayfs.service b/projectroot/usr/lib/systemd/system/fake-overlayfs.service
> index daa6fd03f..818d624b9 100644
> --- a/projectroot/usr/lib/systemd/system/fake-overlayfs.service
> +++ b/projectroot/usr/lib/systemd/system/fake-overlayfs.service
> @@ -1,11 +1,10 @@
> [Unit]
> Description=Fake Overlay Filesystem
> DefaultDependencies=no
> -After=local-fs.target
> +Before=local-fs.target
> Requires=local-fs.target
>
> [Service]
> Type=oneshot
> -RemainAfterExit=no
> +RemainAfterExit=yes
> ExecStart=/usr/sbin/fake-overlayfs
> -MountFlags=private
> diff --git a/projectroot/usr/sbin/fake-overlayfs b/projectroot/usr/sbin/fake-overlayfs
> index b6692c578..de852b520 100644
> --- a/projectroot/usr/sbin/fake-overlayfs
> +++ b/projectroot/usr/sbin/fake-overlayfs
> @@ -2,7 +2,7 @@
>
> OVERLAY_DIRS="@OVERLAY_DIRLIST@"
>
> -bdir=/tmp/.fake-overlay-root
> +bdir=/run/.fake-overlay-root
>
> mkdir $bdir
> mount -o bind,private / $bdir
> @@ -14,10 +14,9 @@ while [ $# -gt 0 ]; do
> shift
> continue
> fi
> - echo $1
> src="$bdir$1"
> - dst="$1/"
> - test -e "$dst" || mkdir $dst
> + dst=$1
> + mount -t tmpfs tmpfs $dst
> cp -a "$src/"* "$src/".[^.]* "$src/"..?* $dst 2> /dev/null
> shift
> done
>
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prev parent reply other threads:[~2020-10-09 13:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 22:38 Ladislav Michl
2020-10-09 13:06 ` Michael Olbrich [this message]
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