mirror of
https://github.com/systemd/systemd.git
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194 lines
9.1 KiB
Python
194 lines
9.1 KiB
Python
#!/usr/bin/env python3
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# SPDX-License-Identifier: LGPL-2.1-or-later
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import re
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import sys
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import uuid
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HEADER = '''\
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| Name | Partition Type UUID | Allowed File Systems | Explanation |
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|------|---------------------|----------------------|-------------|
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'''
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ARCHITECTURES = {
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'ALPHA': 'Alpha',
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'ARC': 'ARC',
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'ARM': '32-bit ARM',
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'ARM64': '64-bit ARM/AArch64',
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'IA64': 'Itanium/IA-64',
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'LOONGARCH64': 'LoongArch 64-bit',
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'MIPS_LE': '32-bit MIPS LittleEndian (mipsel)',
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'MIPS64_LE': '64-bit MIPS LittleEndian (mips64el)',
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'PARISC': 'HPPA/PARISC',
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'PPC': '32-bit PowerPC',
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'PPC64': '64-bit PowerPC BigEndian',
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'PPC64_LE': '64-bit PowerPC LittleEndian',
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'RISCV32': 'RISC-V 32-bit',
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'RISCV64': 'RISC-V 64-bit',
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'S390': 's390',
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'S390X': 's390x',
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'TILEGX': 'TILE-Gx',
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'X86': 'x86',
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'X86_64': 'amd64/x86_64',
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}
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TYPES = {
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'ROOT' : 'Root Partition',
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'ROOT_VERITY' : 'Root Verity Partition',
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'ROOT_VERITY_SIG' : 'Root Verity Signature Partition',
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'USR' : '`/usr/` Partition',
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'USR_VERITY' : '`/usr/` Verity Partition',
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'USR_VERITY_SIG' : '`/usr/` Verity Signature Partition',
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'ESP': 'EFI System Partition',
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'SRV': 'Server Data Partition',
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'VAR': 'Variable Data Partition',
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'TMP': 'Temporary Data Partition',
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'SWAP': 'Swap',
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'HOME': 'Home Partition',
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'USER_HOME': 'Per-user Home Partition',
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'LINUX_GENERIC': 'Generic Linux Data Partition',
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'XBOOTLDR': 'Extended Boot Loader Partition',
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}
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DESCRIPTIONS = {
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'ROOT': (
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'Any native, optionally in LUKS',
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'On systems with matching architecture, the first partition with this type UUID on the disk '
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'containing the active EFI ESP is automatically mounted to the root directory `/`. '
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'If the partition is encrypted with LUKS or has dm-verity integrity data (see below), the '
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'device mapper file will be named `/dev/mapper/root`.'),
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'USR': (
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'Any native, optionally in LUKS',
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'Similar semantics to root partition, but just the `/usr/` partition.'),
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'ROOT_VERITY': (
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'A dm-verity superblock followed by hash data',
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'Contains dm-verity integrity hash data for the matching root partition. If this feature is '
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'used the partition UUID of the root partition should be the first 128 bits of the root hash '
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'of the dm-verity hash data, and the partition UUID of this dm-verity partition should be the '
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'final 128 bits of it, so that the root partition and its Verity partition can be discovered '
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'easily, simply by specifying the root hash.'),
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'USR_VERITY': (
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'A dm-verity superblock followed by hash data',
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'Similar semantics to root Verity partition, but just for the `/usr/` partition.'),
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'ROOT_VERITY_SIG': (
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'A serialized JSON object, see below',
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'Contains a root hash and a PKCS#7 signature for it, permitting signed dm-verity GPT images.'),
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'USR_VERITY_SIG': (
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'A serialized JSON object, see below',
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'Similar semantics to root Verity signature partition, but just for the `/usr/` partition.'),
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'ESP': (
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'VFAT',
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'The ESP used for the current boot is automatically mounted to `/efi/` (or `/boot/` as '
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'fallback), unless a different partition is mounted there (possibly via `/etc/fstab`, or '
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'because the Extended Boot Loader Partition — see below — exists) or the directory is '
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'non-empty on the root disk. This partition type is defined by the '
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'[UEFI Specification](http://www.uefi.org/specifications).'),
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'XBOOTLDR': (
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'Typically VFAT',
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'The Extended Boot Loader Partition (XBOOTLDR) used for the current boot is automatically '
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'mounted to `/boot/`, unless a different partition is mounted there (possibly via '
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'`/etc/fstab`) or the directory is non-empty on the root disk. This partition type '
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'is defined by the [Boot Loader '
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'Specification](https://uapi-group.org/specifications/specs/boot_loader_specification).'),
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'SWAP': (
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'Swap, optionally in LUKS',
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'All swap partitions on the disk containing the root partition are automatically enabled. '
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'If the partition is encrypted with LUKS, the device mapper file will be named '
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'`/dev/mapper/swap`. This partition type predates the Discoverable Partitions Specification.'),
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'HOME': (
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'Any native, optionally in LUKS',
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'The first partition with this type UUID on the disk containing the root partition is '
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'automatically mounted to `/home/`. If the partition is encrypted with LUKS, the device '
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'mapper file will be named `/dev/mapper/home`.'),
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'SRV': (
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'Any native, optionally in LUKS',
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'The first partition with this type UUID on the disk containing the root partition is '
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'automatically mounted to `/srv/`. If the partition is encrypted with LUKS, the device '
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'mapper file will be named `/dev/mapper/srv`.'),
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'VAR': (
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'Any native, optionally in LUKS',
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'The first partition with this type UUID on the disk containing the root partition is '
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'automatically mounted to `/var/` — under the condition that its partition UUID matches '
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'the first 128 bits of `HMAC-SHA256(machine-id, 0x4d21b016b53445c2a9fb5c16e091fd2d)` '
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'(i.e. the SHA256 HMAC hash of the binary type UUID keyed by the machine ID as read from '
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'[`/etc/machine-id`](https://www.freedesktop.org/software/systemd/man/machine-id.html). '
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'This special requirement is made because `/var/` (unlike the other partition types '
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'listed here) is inherently private to a specific installation and cannot possibly be '
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'shared between multiple OS installations on the same disk, and thus should be bound to '
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'a specific instance of the OS, identified by its machine ID. If the partition is '
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'encrypted with LUKS, the device mapper file will be named `/dev/mapper/var`.'),
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'TMP': (
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'Any native, optionally in LUKS',
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'The first partition with this type UUID on the disk containing the root partition is '
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'automatically mounted to `/var/tmp/`. If the partition is encrypted with LUKS, the '
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'device mapper file will be named `/dev/mapper/tmp`. Note that the intended mount point '
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'is indeed `/var/tmp/`, not `/tmp/`. The latter is typically maintained in memory via '
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'`tmpfs` and does not require a partition on disk. In some cases it might be '
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'desirable to make `/tmp/` persistent too, in which case it is recommended to make it '
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'a symlink or bind mount to `/var/tmp/`, thus not requiring its own partition type UUID.'),
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'USER_HOME': (
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'Any native, optionally in LUKS',
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'A home partition of a user, managed by '
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'[`systemd-homed`](https://www.freedesktop.org/software/systemd/man/systemd-homed.html).'),
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'LINUX_GENERIC': (
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'Any native, optionally in LUKS',
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'No automatic mounting takes place for other Linux data partitions. This partition type '
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'should be used for all partitions that carry Linux file systems. The installer needs '
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'to mount them explicitly via entries in `/etc/fstab`. Optionally, these partitions may '
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'be encrypted with LUKS. This partition type predates the Discoverable Partitions Specification.'),
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}
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def extract(file):
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for line in file:
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# print(line)
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m = re.match(r'^#define\s+SD_GPT_(.*SD_ID128_MAKE\(.*\))', line)
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if not m:
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continue
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name = line.split()[1]
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if m2 := re.match(r'^(ROOT|USR)_([A-Z0-9]+|X86_64|PPC64_LE|MIPS_LE|MIPS64_LE)(|_VERITY|_VERITY_SIG)\s+SD_ID128_MAKE\((.*)\)', m.group(1)):
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ptype, arch, suffix, u = m2.groups()
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u = uuid.UUID(u.replace(',', ''))
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assert arch in ARCHITECTURES, f'{arch} not in f{ARCHITECTURES}'
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ptype = f'{type}{suffix}'
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assert ptype in TYPES
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yield name, ptype, arch, u
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elif m2 := re.match(r'(\w+)\s+SD_ID128_MAKE\((.*)\)', m.group(1)):
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ptype, u = m2.groups()
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u = uuid.UUID(u.replace(',', ''))
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yield name, ptype, None, u
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else:
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raise ValueError(f'Failed to match: {m.group(1)}')
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def generate(defines):
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prevtype = None
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print(HEADER, end='')
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uuids = set()
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for name, ptype, arch, puuid in defines:
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tdesc = TYPES[ptype]
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adesc = '' if arch is None else f' ({ARCHITECTURES[arch]})'
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# Let's make sure that we didn't select&paste the same value twice
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assert puuid not in uuids
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uuids.add(puuid)
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if ptype != prevtype:
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prevtype = ptype
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morea, moreb = DESCRIPTIONS[ptype]
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else:
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morea = moreb = 'ditto'
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print(f'| _{tdesc}{adesc}_ | `{puuid}` `{name}` | {morea} | {moreb} |')
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if __name__ == '__main__':
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known = extract(sys.stdin)
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generate(known)
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