And implement it on ext2, 3, 4. I don't know all the filesystems
that can have posix permissions, those three will do. if we need
more in the future we implement them, it's two lines of code.
The GPT partition layout supports partition attributes.
The CLI sfdisk sets the partition attributes using the option
--part-attrs. See the examples below:
$ cat <<EOF | sfdisk disk.img
label: gpt
type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, size=64M
type=0FC63DAF-8483-4772-8E79-3D69D8477DE4
EOF
(...)
$ sfdisk --part-attrs disk.img 1 RequiredPartition,NoBlockIOProtocol,LegacyBIOSBootable,48
(...)
$ sfdisk --part-attrs disk.img 2 60,61,62,63
(...)
$ sfdisk --dump disk.img
(...)
disk.img1 : start= 2048, size= 131072, type=C12A7328-F81F-11D2-BA4B-00A0C93EC93B, uuid=BBE806BB-8567-A843-9FF5-9B6B35D2908E, attrs="RequiredPartition NoBlockIOProtocol LegacyBIOSBootable GUID:48"
disk.img2 : start= 133120, size= 1963999, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, uuid=7DB39F08-C138-664B-B38E-ED2DEB549AA6, attrs="GUID:60,61,62,63"
This commit introduces the new job set-partition-attributes that is used
in the new-operation to set the attributes of the partition. The job
uses the newly introduced method setPartitionAttributes that is
implemented by the sfdisk and dummy backends.
Note: This is a copypaste of what was done for GPT partition label in
commit f585f6c (Add new job to set the GPT partition label) and GPT
partition UUID in commit 1dde035 (Add new job to set the GPT partition
UUID).
Note: RequiredPartition, NoBlockIOProtocol, LegacyBIOSBootable are
key words for 0, 1 and 2.
The GPT partition layout defines the type of the partition using a
UUID[1]. The type of the partition is not related to the underlying
filesystem but to its functionality: rootfs, home, var, swap, esp...
The UUID 4f68bce3-e8cd-4db1-96e7-fbcaf984b709 defines the root partition
(/), the UUID 933ac7e1-2eb4-4f13-b844-0e14e2aef915 defines the home
partition (/home), the UUID 4d21b016-b534-45c2-a9fb-5c16e091fd2d defines
the variable partition (/var)... Also, the UUIDs may vary depending on
the architecture (x86, x86_64, arm or aarch64).
KPMcore guesses the type depending on the underlying filesystem.
This commit enables the setting of a more specific GPT type if it is
specified through the method Partition::setType(). It falls back to the
previous guess type if the type is left unset.
[1]: https://systemd.io/DISCOVERABLE_PARTITIONS/
Tomaz Canabrava
Artem Grinev
Andrius Štikonas
Gaël PORTAY
Teo Mrnjavac