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This documents two possible values expected by the option
root-hash-signature for veritytab and veritysetup-generator.
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Fixes a bug introduced by 9612da361a825d70a9fd392f3ee5a53bf8896887.
Follow-up for f777e745a7966ea52ef29f9e4edfdd16874cfe86.
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Follow-up for 6467bda59d571696b645e8bbdf31926676890956.
Addresses https://github.com/systemd/systemd/pull/22871#discussion_r837705779.
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It should be merged soon.
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On arm, we'd fail with:
target@v:5.16.8-200.fc35.armv7hl+lpae.socket: not a valid unit name "target@v:5.16.8-200.fc35.armv7hl+lpae.socket": Invalid argument
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Some filesystems (e.g. zfs with compression!=off, which is the default
configuration) automatically hole-punch all-zero blocks ‒ write a block
full of ones instead
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keszybz/symlink-enablement-yet-again-punish-me-harder
Fixups to the unit enablement logic
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As suggested in
https://github.com/systemd/systemd/pull/22649/commits/8b3ad3983f5440eef812b34e5ed862ca59fdf7f7#r837345892
The define is generalized and moved to path-lookup.h, where it seems to fit
better. This allows a recursive include to be removed and in general makes
things simpler.
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Tests were failing on centos7 because systemd-id128 is not in path.
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Inspired by 7910ec3bcde2ee0086b3e49f8aaa2a9f13f58d97.
'! true' passes, because it's a conditional expression.
But '( ! true )' fails, because '( … )' creates a subshell, i.e. a separate
program, and '! true' becomes the return value of that program, and the whole
thing apparently is not a conditional expression for the outer shell.
This is shorter, so let's just do this.
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We would only accept "identical" links, but having e.g. a symlink
/usr/lib/systemd/system/foo-alias.service → /usr/lib/systemd/system/foo.service
when we're trying to create /usr/lib/systemd/system/foo-alias.service →
./foo.service is OK. This fixes an issue found in ubuntuautopkg package
installation, where we'd fail when enabling systemd-resolved.service, because
the existing alias was absolute, and (with the recent patches) we were trying
to create a relative one.
A test is added.
(For .wants/.requires symlinks we were already doing OK. A test is also
added, to verify.)
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Quoting is not necessary in many places, but I think it's nicer
to use it consistently.
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When we have a symlink that goes outside of our search path, we should just
ignore the target file name. But we were verifying it, and rejecting in
the case where a symlink was created manually.
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The two states are distinguished, but are treated everywhere identically,
so there is no difference in behaviour except for slighlty different log
output.
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Having the reverse condition first makes changes that I want to do
later awkward, so reverse it as a separate step first.
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All callers were just passing info + info->root, we can simplify this.
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symlink target
We'd say that file is enabled indirectly if we had a symlink like:
foo@.service ← bar.target.wants/foo@one.service
but not when we had
foo@one.service ← bar.target.wants/foo@one.service
The effect of both link types is the same. In fact we don't care
about the symlink target. (We'll warn if it is mismatched, but we honour
it anyway.)
So let's use the original match logic only for aliases.
For .wants/.requires we instead look for a matching source name,
or a source name that matches after stripping of instance.
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This is a fairly noticable change, but I think it needs to be done.
So far we'd create an absolute symlink to the target unit file:
.wants/foo.service → /usr/lib/systemd/system/foo.service
or
alias.service → /etc/systemd/system/aliased.service.
This works reasonably well, except in one case: where the unit file
is linked. When we look at a file link, the name of the physical file
isn't used, and we only take the account the symlink source name.
(In fact, the destination filename may not even be a well-formed unit name,
so we couldn't use it, even if we wanted to.) But this means that if
a file is linked, and specifies aliases, we'd create absolute links for
those aliases, and systemd would consider each "alias" to be a separate
unit. This isn't checked by the tests here, because we don't have a running
systemd instance, but it is easy enough to check manually.
The most reasonable way to fix this is to create relative links to the
unit file:
.wants/foo.service → ../foo.service
alias.service → aliased.service.
I opted to use no prefix for aliases, both normal and 'default.target',
and to add "../" for .wants/ and .requires/. Note that the link that is
created doesn't necessarily point to the file. E.g. if we're enabling
a file under /usr/lib/systemd/system, and create a symlink in /etc/systemd/system,
it'll still be "../foo.service", not "../../usr/lib/systemd/system/foo.service".
For our unit loading logic this doesn't matter, and figuring out a path
that actually leads somewhere would be more work. Since the user is allowed
to move the unit file, or add a new unit file in a different location, and
we don't actually follow the symlink, I think it's OK to create a dangling
symlink. The prefix of "../" is useful to give a hint that the link points
to files that are conceptually "one level up" in the directory hierarchy.
With the relative symlinks, systemd knows that those are aliases.
The tests are adjusted to use the new forms. There were a few tests that
weren't really testing something useful: 'test -e x' fails if 'x' is a
a dangling symlink. Absolute links in the chroot would be dangling, even
though the target existed in the expected path, but become non-dangling
when made relative and the test fails.
This should be described in NEWS, but I'm not adding that here, because
it'd likely result in conflicts.
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../foo@one.service
So far 'systemctl enable' would create absolute links to the target template
name. And we would remove such symlinks just fine. But the user may create
symlinks manually in a different form. In particular, symlinks for instanced
units *must* have the instance in the source name, and then it is natural to
also include it in the target name (.wants/foo@one.service → ../foo@one.service
rather than .wants/foo@one.service → ../foo@.service). We would choke on such
links, or not remove them at all. A test is added:
before:
+ build-rawhide/systemctl --root=/tmp/systemctl-test.001xda disable templ1@.service
Removed "/tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@seven.service".
Removed "/tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@six.service".
Removed "/tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@five.service".
Removed "/tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@four.service".
Removed "/tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@three.service".
Failed to disable unit, refusing to operate on linked unit file /tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@two.service.
Failed to disable unit, refusing to operate on linked unit file /tmp/systemctl-test.001xda/etc/systemd/system/services.target.wants/templ1@two.service.
after:
+ build-rawhide/systemctl --root=/tmp/systemctl-test.QVP0ev disable templ1@.service
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@seven.service".
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@six.service".
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@five.service".
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@four.service".
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@three.service".
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@two.service".
Removed "/tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@one.service".
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@one.service
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@two.service
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@three.service
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@four.service
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@five.service
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@six.service
+ test '!' -h /tmp/systemctl-test.QVP0ev/etc/systemd/system/services.target.wants/templ1@seven.service
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We use the symlink source name and destination names to decide whether to remove
the symlink. But if the source name is enough to decide to remove the symlink,
we'd still look up the destination for no good reason. This is a slow operation,
let's skip it.
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Current behaviour is wrong, but it cannot be shown in this test, because we
don't have a running systemd instance here.
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I linked a file as root, so I had a symlink /root/test.service ← /etc/systemd/system/test.service.
To my surpise, when running test-systemctl-enable, it failed with a cryptic EACCES.
The previous commit made the logs a bit better. Strace shows that we
were trying to follow the symlink without taking --root into account.
It seems that this bug was introduced in 66a19d85a533b15ed32f4066ec880b5a8c06babd:
before it, we'd do readlink_malloc(), which returned a path relative to root. But
we only used that path for checking if the path is in remove_symlinks_to set, which
contains relative paths. So if the path was relative, we'd get a false-negative
answer, but we didn't go outside of the root. (We need to canonicalize the symlink
to get a consistent answer.) But after 66a19 we use chase_symlinks(), without taking
root into account which is completely bogus.
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When chase_symlinks() fails, we'd get the generic error:
Failed to disable: Permission denied.
Let's at least add the failure to changes list, so the user gets
a slightly better message. Ideally, we'd say where exactly the permission
failure occured, but chase_symlinks() is a library level function and I don't
think we should add logging there. The output looks like this now:
Failed to resolve symlink "/tmp/systemctl-test.1r7Roj/etc/systemd/system/link5alias2.service": Permission denied
Failed to resolve symlink "/tmp/systemctl-test.1r7Roj/etc/systemd/system/link5alias.service": Permission denied
Failed to disable unit, file /tmp/systemctl-test.1r7Roj/etc/systemd/system/link5alias2.service: Permission denied.
Failed to disable unit, file /tmp/systemctl-test.1r7Roj/etc/systemd/system/link5alias.service: Permission denied.
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I was considering deduplicating the list of target units in
WantedBy/RequiredBy. But to do this meaningfully, we'd need to do alias
expansion first, i.e. after the initial parsing is done. This seems to be
more trouble than it would be worth.
Instead, I added tests that we're doing the right thing and creating symlinks
as expected. For duplicate links, we create the link, and on the second time we
see that the link is already there, so the output is correct.
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setup twice
It was pretty ugly that we were creating LookupPaths twice.
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We'd create aliases and other symlinks first, and only then try to create
the main link. Since that can fail, let's do things in opposite order, and
abort immediately if we can't link the file itself.
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We don't need to talk about Alias=. The approach of using Alias= to enable
units is still supported, but hasn't been advertised as the way to do thing
for many years. Using it as an explanation is just confusing.
Also, the description of templated units did not take DefaultInstance=
into account. It is updated and extended.
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We had a check that was done in unit_file_resolve_symlink(). Let's move
the check to unit_validate_alias_symlink_or_warn(), which makes it available
to the code in install.c.
With this, unit_file_resolve_symlink() behaves almost the same. The warning
about "suspicious symlink" is done a bit later. I think this should be OK.
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Some calls to lookup_path_init() were not followed by any log emission.
E.g.:
$ SYSTEMD_LOG_LEVEL=debug systemctl --root=/missing enable unit; echo $?
1
Let's add a helper function and use it in various places.
$ SYSTEMD_LOG_LEVEL=debug build/systemctl --root=/missing enable unit; echo $?
Failed to initialize unit search paths for root directory /missing: No such file or directory
1
$ SYSTEMCTL_SKIP_SYSV=1 build/systemctl --root=/missing enable unit; echo $?
Failed to initialize unit search paths for root directory /missing: No such file or directory
Failed to enable: No such file or directory.
1
The repeated error in the second case is not very nice, but this is a niche
case and I don't think it's worth the trouble to trying to avoid it.
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possible
So far we'd issue a warning (before this series, just in the logs on the server
side, and before this commit, on stderr on the caller's side), but return
success. It seems that successfull return was introduced by mistake in
aa0f357fd833feecbea6c3e9be80b643e433bced (my fault :( ), which was supposed to
be a refactoring without a functional change. I think it's better to fail,
because if enablement fails, the user will most likely want to diagnose the
issue.
Note that we still do partial enablement, as far as that is possible. So if
e.g. we have [Install] Alias=foo.service foobar, we'll create the symlink
'foo.service', but not 'foobar', since that's not a valid unit name. We'll
print info about the action taken, and about 'foobar' being invalid, and return
failure.
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If an invalid arg appears in [Install] Alias=, WantedBy=, RequiredBy=,
we'd warn in the logs, but not propagate this information to the caller,
and in particular not over dbus. But if we call "systemctl enable" on a
unit, and the config if invalid, this information is quite important.
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No functional change.
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We would resolve those specifiers to the calling user/group. This is mostly OK
when done in the manager, because the manager generally operates as root
in system mode, and a non-root in user mode. It would still be wrong if
called with --test though. But in systemctl, this would be generally wrong,
since we can call 'systemctl --system' as a normal user, either for testing
or even for actual operation with '--root=…'.
When operating in --global mode, %u/%U/%g/%G should return an error.
The information whether we're operating in system mode, user mode, or global
mode is passed as the data pointer to specifier_group_name(), specifier_user_name(),
specifier_group_id(), specifier_user_id(). We can't use userdata, because
it's already used for other things.
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This makes it easier to pass it around in preparation for future changes.
While at it, let's rename InstallContext c → ctx, and InstallInfo i → info.
'c' and 'i' are bad names for variables that are passed through multiple layers
of functions calls. It's easier to follow what is happening with a meaningful
variable names.
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$ build/systemctl --root=/tmp/systemctl-test.KXY8fu enable some-some-link6@.socket
Failed to enable unit, invalid specifier in "target@C:%C.socket".
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files
ENOENT is easily confused with the file that we're working on not being
present, e.g. when the file contains %o or something else that requires
os-release to be present. Let's use -EUNATCH instead to reduce that chances of
confusion if the context of the error is lost.
And once we have pinpointed the reason, let's provide a proper error message:
+ build/systemctl --root=/tmp/systemctl-test.TO7Mcb enable some-some-link6@.socket
/tmp/systemctl-test.TO7Mcb/etc/systemd/system/some-some-link6@.socket: Failed to resolve alias "target@A:%A.socket": Protocol driver not attached
Failed to enable unit, cannot resolve specifiers in "target@A:%A.socket".
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In systemd.unit we document that unset fields resolve to "". But we didn't
directly test this, so let's do that. Also, we return -ENOENT if the file
is missing, which we didn't document or test.
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We didn't actually say that keys should not be repeated. At least the
examples in docs (both python and shell) would do that, and any simple
parser that builds a dictionary would most likely behave the same way.
But let's document this expectation, but also say how to deal with malformed
files.
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We generally assume parsing like the shell would do it, so the last value
should win when there are repeats.
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The test for the variable is added in test-systemctl-enable because there we
can do it almost for free, and the variable is most likely to be used with
'systemctl enable --root' anyway.
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This just describes the rules that are implemented by the manager, and this
pull request does not change any of them.
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I put it in tests because I think we're most likely to use it in tests.
If necessary, it can be moved somewhere else later.
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