udev now requires devtmpfs, so update the SysV init script and various
other places to use devtmpfs instead of tmpfs.  Closes: #722604

Since UDEV_ROOT support has been removed upstream, simplify
enable_udev() which is run on initial installation. We now just run
"invoke-rc.d udev start" and restart daemons whose sockets might have
been hidden by the devtmpfs.

Add preinst check to abort udev upgrade if the currently running kernel
lacks devtmpfs support. Since udev 176, devtmpfs is mandatory as udev no
longer creates any device nodes itself. This only affects self-compiled
kernels which now need CONFIG_DEVTMPFS=y.  Closes: #722580

udev 196 introduced a new "hwdb" builtin which is not understood by the
old udev daemon.

Nesting the upgrade version checks safes us a few
"dpkg --compare-versions" calls, but makes the code unnecessarily hard
to read. Since "dpkg --compare-versions" is rather cheap, re-order the
version checks to improve readability.

UDEV_ROOT is no longer configurable, so simply use /dev everywhere.
See also dbad4c2a

This dependency was copied over from the old udev-gtk-udeb package and
no longer makes any sense since libudev1-udeb only contains a library
nowadays. It also leads to a circular dependency.

This ensures that udev-udeb gets a proper dependency on
libudev1-udeb and not libudev1.  Closes: #722939

We don't ship the kernel-install binary so we shouldn't ship its man
page either.  Closes: #722180

Since Debian hasn't done the usr-merge (yet), various binaries are still
installed in / and not /usr.
Update the defaults in configure.ac so we don't have to build-depend on
quota, libcap2-bin, procps, kmod and kexec-tools just to get the correct
paths.  Closes: #721347

It was added in udev 171-2 where the changelogs and documentation files
in udev were converted to symlinks pointing to libudev0.

Use a shlibs.local file to generate strict inter-package dependencies
and add an explicit versioned dependency on libsystemd-login0 to systemd.
This ensures that e.g. libsystemd-login is always talking to the correct
version of systemd-logind.  Closes: #719444

Signed-off-by: Ondrej Balaz <blami@blami.net>

I.e. make systemctl enable rsyslog work (previously, only systemctl
enable rsyslog.service)

otherwise the property is set for all devices.

The /bin/sh symlink typically points to dash, which is a very basic and
not very comfortable shell. Since bash is an essential package and thus
always available, use that as debug-shell instead.

…by adding an [Install] section to tmp.mount and removing the
local-fs.target.wants symlink.

Users can use “systemctl enable tmp.mount” to enable mounting /tmp after
the next reboot and “systemctl start tmp.mount” to get /tmp mounted as
tmpfs right now (beware, files currently in /tmp will not be visible
anymore afterwards).

This gives the output of systemd-delta, systemctl dump
and the contents of /var/lib/systemd/deb-systemd-helper-enabled.

Print the udev database for udev.

Closes: #711245

This makes ctrl-alt-del reboots more robust, just like "systemctl
reboot".

The /lib/init/rw directory is gone since wheezy, so talking about that
in README.Debian is likely to be more confusing then helpful.

Since 11ec7ced, journald isn't setting the ACLs properly anymore if
the files had no ACLs to begin with: acl_set_fd fails with EINVAL.

An ACL with ACL_USER or ACL_GROUP entries but no ACL_MASK entry is
invalid, so make sure a mask exists before trying to set the ACL.

Debian doesn't have /sbin/sushell, so use /bin/sh in
debug-shell.service.

Spotted by uau in #systemd.