Re: [arch-projects] [devtools] [PATCH] use nspawn to bind mount needed directories

On Sun, Mar 10, 2013 at 10:09:48AM +0100, Pierre Schmitz wrote:

Am 28.02.2013 23:09, schrieb Dave Reisner:

...

systemd-nspawn is capable of doing this as of systemd-198.

Signed-off-by: Dave Reisner --- mkarchroot.in | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/mkarchroot.in b/mkarchroot.in index 20de5e6..c7c7bcb 100644 --- a/mkarchroot.in +++ b/mkarchroot.in @@ -95,14 +95,21 @@ bind_mount() { mount --make-slave "$target" }

-chroot_mount() { - trap 'trap_chroot_umount' EXIT INT QUIT TERM HUP +build_mount_args() { + local p + declare -g mount_args=()

- [[ -n $host_mirror_path ]] && bind_mount "$host_mirror_path" ro + if [[ -n $host_mirror_path ]]; then + printf -v p '%q' "$host_mirror_path" + mount_args+=(--bind-ro="$p") + fi + + printf -v p '%q' "${cache_dirs[0]}" + mount_args+=(--bind="$p")

- bind_mount "${cache_dirs[0]}" for cache_dir in ${cache_dirs[@]:1}; do - bind_mount "$cache_dir" ro + printf -v p '%q' "$cache_dir" + mount_args+=(--bind-ro="$p") done }

@@ -148,7 +155,7 @@ chroot_lock () { chroot_run() { local dir=$1 shift - eval systemd-nspawn -D "${dir}" -- ${@} 2>/dev/null + eval systemd-nspawn -D "${dir}" "${mount_args[@]}" -- ${@} 2>/dev/null }

# }}} @@ -164,7 +171,7 @@ if [[ -n $RUN ]]; then fi

chroot_lock - chroot_mount + build_mount_args copy_hostconf

chroot_run "${working_dir}" ${RUN}

We would still need to use chroot_mount when installing the build env as we don't use nspawn here.

Could you clarify this? I'm not following this...

Also: doesn't nspawn umount the mounts it mounted on exit?

Yes, it does. Isn't that what we want? I've been using this patch since I wrote it, and haven't seen any strange behavior as of yet.