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Instead of requiring users to guess the required space for partitions
populated with CopyFiles=, let's make an educated guess ourselves. We
can populate the filesystem once in a very large sparse file and see
how much data is actually used as a good indicator of the required size.
Originally, the table formatting code was written to display a number of
records, one per line, and within each line multiple fields of the same
record. The first line contains the column names.
It was then started to be used in a "vertical" mode however,
i.e. with field names on the left instead of the top. Let's support such
a mode explicitly, so that we can provide systematic styling, and can
properly convert this mode to JSON.
A new constructor "table_new_vertical()" is added creating such
"vertical" tables. Internally, this is a table with two columns: "key"
and "value". When outputting this as JSON we'll output a single JSON
object, with key/value as fields. (Which is different from the
traditional output where we'd use the first line as JSON field names,
and output an array of objects).
A new cell type TABLE_FIELD is added for specifically marking the
"field" cells, i.e. the cells in the first column. We'll automatically
suffic ":" to these fields on output.
This is useful to force off fancy unicode glyph use (i.e. use "->"
instead of "→"), which is useful in tests where locales might be
missing, and thus control via $LC_CTYPE is not reliable.
Use this in TEST-58, to ensure the output checks we do aren't confused
by missing these glyphs being unicode or not.
Let's say we have the following repart definitions files root.conf
and home.conf:
```
[Partition]
Type=root
CopyFiles=/
```
```
[Partition]
Type=home
CopyFiles=/home
```
Currently, we'd end up copying /home to both the root partition and
the home partition. To prevent this from happening, let's adopt a
new policy when copying files for a partition: We won't copy any
files/directories that appear in the CopyFiles= list of another
partition, unless that directory explicitly appears in our own
CopyFiles= list.
This way, we prevent copying /home twice into the root and home
partition, but should a user really want that behavior, they can
have it by adding /home to the CopyFIles= list of the root partition
as well.
systemd-repart generates this in a suitably stable fashion, hence let's
actually use it as an identifier for the image. As a first step parse
it, and show it.
The per-link settings are ignored if the feature is disabled by the global setting.
Let's announce the effective level, to make not users confused.
Closes#24863.
Due to "historical reasons" both gcc and clang treat *all* trailing
arrays members as flexible arrays, this has an evil side effect
of inhibiting bounds checks on such members as __builtin_object_size
cannot say for sure that:
struct {
...
type foo[3];
}
has a trailing foo member of fixed size rather than unspecified.
Ideally we should use -fstrict-flex-arrays as is, but we have to
tolerate kernel uapi headers that use [0] and third party libraries
written in c89 that may use [1] like curl.
in_initrd() was really doing two things: checking if we're in the initrd, and
also verifying that the initrd is set up correctly. But this second check is
complicated, in particular it would return false for overlayfs, even with an
upper tmpfs layer. It also doesn't support the use case of having an initial
initrd with tmpfs, and then transitioning into an intermediate initrd that is
e.g. a DDI, i.e. a filesystem possibly with verity arranged as a disk image.
We don't need to check if we're in initrd in every program. Instead, concerns
are separated:
- in_initrd() just does a simple check for /etc/initrd-release.
- When doing cleanup, pid1 checks if it's on a tmpfs before starting to wipe
the old root. The only case where we want to remove the old root is when
we're on a plain tempory filesystem. With an overlay, we'd be creating
whiteout files, which is not very useful. (*)
This should resolve https://bugzilla.redhat.com/show_bug.cgi?id=2137631
which is caused by systemd refusing to treat the system as an initrd because
overlayfs is used.
(*) I think the idea of keeping the initrd fs around for shutdown is outdated.
We should just have a completely separate exitrd that is unpacked when we want
to shut down. This way, we don't waste memory at runtime, and we also don't
transition to a potentially older version of systemd. But we don't have support
for this yet.
This replaces 0fef5b0f0b.
