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mount: use /dev/.run as an early boot alias for /var/run

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During early boot, mount a tmpfs to /dev/.run and then bind mount it to
/var/run as soon as /var is available.

This makes it possible for programs involved in early boot to put
runtime data in /dev/.run which later on will show up in /var/run like
any other.

This can be used to solve the early-boot D-Bus problem: D-Bus may start
up with its socket bound to /dev/.run/dbus/system_bus_socket and after
/var it will also be available under the traditional name
/var/run/dbus/system_bus_socket.

This also is intended to be used as a better place for systemd, mount,
mdadm, blkid, plymouth, bootchart and dracut runtime data, which is
currently stored in various places in /dev/.xxx.
This commit is contained in:
Lennart Poettering 2011-03-09 02:51:45 +01:00
parent 1de4d79bf5
commit cc5524ecc6
2 changed files with 4 additions and 3 deletions
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1
src/mount-setup.c
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@ -54,6 +54,7 @@ static const MountPoint mount_table[] = {
{ "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true }, { "devtmpfs", "/dev", "devtmpfs", "mode=755", MS_NOSUID, true },
{ "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV, true }, { "tmpfs", "/dev/shm", "tmpfs", "mode=1777", MS_NOSUID|MS_NODEV, true },
{ "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, false }, { "devpts", "/dev/pts", "devpts", "mode=620,gid=" STRINGIFY(TTY_GID), MS_NOSUID|MS_NOEXEC, false },
{ "tmpfs", "/dev/.run", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, { "tmpfs", "/sys/fs/cgroup", "tmpfs", "mode=755", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
{ "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true }, { "cgroup", "/sys/fs/cgroup/systemd", "cgroup", "none,name=systemd", MS_NOSUID|MS_NOEXEC|MS_NODEV, true },
}; };

6
units/var-run.mount
View File

@ -10,7 +10,7 @@ Description=Runtime Directory
Before=local-fs.target Before=local-fs.target
[Mount] [Mount]
What=tmpfs What=/dev/.run
Where=/var/run Where=/var/run
Type=tmpfs Type=bind
Options=mode=755,nosuid,nodev,noexec Options=bind