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According to RFC2616[1], HTTP header names are case-insensitive. So
it's totally valid to have a header starting with either `Date:` or
`date:`.
However, when systemd-importd pulls an image from an HTTP server, it
parses HTTP headers by comparing header names as-is, without any
conversion. That causes failures when some HTTP servers return headers
with different combinations of upper-/lower-cases.
An example:
https://alpha.release.flatcar-linux.net/amd64-usr/current/flatcar_developer_container.bin.bz2 returns `Etag: "pe89so9oir60"`,
while https://alpha.release.core-os.net/amd64-usr/current/coreos_developer_container.bin.bz2
returns `ETag: "f03372edea9a1e7232e282c346099857"`.
Since systemd-importd expects to see `ETag`, the etag for the Container Linux image
is correctly interpreted as a part of the hidden file name.
However, it cannot parse etag for Flatcar Linux, so the etag the Flatcar Linux image
is not appended to the hidden file name.
```
$ sudo ls -al /var/lib/machines/
-r--r--r-- 1 root root 3303014400 Aug 21 20:07 '.raw-https:\x2f\x2falpha\x2erelease\x2ecore-os\x2enet\x2famd64-usr\x2fcurrent\x2fcoreos_developer_container\x2ebin\x2ebz2.\x22f03372edea9a1e7232e282c346099857\x22.raw'
-r--r--r-- 1 root root 3303014400 Aug 17 06:15 '.raw-https:\x2f\x2falpha\x2erelease\x2eflatcar-linux\x2enet\x2famd64-usr\x2fcurrent\x2fflatcar_developer_container\x2ebin\x2ebz2.raw'
```
As a result, when the Flatcar image is removed and downloaded again,
systemd-importd is not able to determine if the file has been already
downloaded, so it always download it again. Then it fails to rename it
to an expected name, because there's already a hidden file.
To fix this issue, let's introduce a new helper function
`memory_startswith_no_case()`, which compares memory regions in a
case-insensitive way. Use this function in `curl_header_strdup()`.
See also https://github.com/kinvolk/kube-spawn/issues/304
[1]: https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
On Dell machines LoadOptions is filled with:
01 00 00 00 <name of BIOS Boot Loader Entry> ... <unknown bytes>
So, in case of meaningfull LoadOptions, better check if the first char
is a printable character.
Fix#9993. When this code was split out to user-runtime-dir, it forgot to
include the call to mac_selinux_init(). So mkdir_label() stopped working.
Fixes: a9f0f5e501 ("logind: split %t directory creation to a helper
unit")
The MountEntry's added for EMPTY_DIR work very similarly to the TMPFS ones.
In both cases, .has_prefix is false. In fact, .has_prefix is false in
*all* the MountEntry's we add except for the access mounts (READONLY etc).
But EMPTY_DIR stuck out by explicitly setting .has_prefix = false.
Let's remove that.
... when no mount options are passed.
Change the code, to avoid the following failure in the newly added tests:
exec-temporaryfilesystem-rw.service: Executing: /usr/bin/sh -x -c
'[ "$(stat -c %a /var)" == 755 ]'
++ stat -c %a /var
+ '[' 1777 == 755 ']'
Received SIGCHLD from PID 30364 (sh).
Child 30364 (sh) died (code=exited, status=1/FAILURE)
(And I spotted an opportunity to use TAKE_PTR() at the end).
We can't remount the underlying superblocks, if we are inside a user
namespace and running Linux <= 4.17. We can only change the per-mount
flags (MS_REMOUNT | MS_BIND).
This type of mount() call can only change the per-mount flags, so we
don't have to worry about passing the right string options now.
Fixes#9914 ("Since 1beab8b was merged, systemd has been failing to start
systemd-resolved inside unprivileged containers" ... "Failed to re-mount
'/run/systemd/unit-root/dev' read-only: Operation not permitted").
> It's basically my fault :-). I pointed out we could remount read-only
> without MS_BIND when reviewing the PR that added TemporaryFilesystem=,
> and poettering suggested to change PrivateDevices= at the same time.
> I think it's safe to change back, and I don't expect anyone will notice
> a difference in behaviour.
>
> It just surprised me to realize that
> `TemporaryFilesystem=/tmp:size=10M,ro,nosuid` would not apply `ro` to the
> superblock (underlying filesystem), like mount -osize=10M,ro,nosuid does.
> Maybe a comment could note the kernel version (v4.18), that lets you
> remount without MS_BIND inside a user namespace.
This makes the code longer and I guess this function is still ugly, sorry.
One obstacle to cleaning it up is the interaction between
`PrivateDevices=yes` and `ReadOnlyPaths=/dev`. I've added a test for the
existing behaviour, which I think is now the correct behaviour.
`systemd-resolved.service` runs as `User=systemd-resolved`, and uses certain
Capabilit{y,ies} magic. By my understanding, this means it is started with a
number of "privileges". Indeed, `capabilities(7)` explains
> Linux divides the privileges traditionally
> associated with superuser into distinct units, known as capabilities,
> which can be independently enabled and disabled."
This situation appears to contradict our current code comment which said
> If we are not running as root we assume all privileges are already dropped.
This appears to be a confusion in the comment only. The rest of the code
tells a much clearer story. (Don't ask me if the story is correct.
`capabilities(7)` scares me). Let's tweak the comment to make it consistent
and avoid worrying readers about this.
If logind is not supported, don't try to schedule a shutdown,
immediately poweroff. This is the behavior indicated by the current
message given to the user, but the command is returning an error. I
believe this was broken on this commit:
7f96539d45
