Synchronize GRUB across multiple disks. https://r00t2.io/
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bootsync/bootsync.xsd

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<?xml version="1.0" encoding="UTF-8" ?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
targetNamespace="http://git.square-r00t.net/BootSync/"
xmlns="http://git.square-r00t.net/BootSync/"
xmlns:bootsync="http://git.square-r00t.net/BootSync/"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:simpleType name="diskdev">
<xs:restriction base="xs:string">
<xs:pattern value="/dev/([A-Za-z0-9+_-]+/)?[A-Za-z0-9+_-]+[0-9]?"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="path">
<xs:restriction base="xs:string">
<xs:pattern value="/([A-Za-z0-9+_.-]+/)*[A-Za-z0-9+_.-]+"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="relpath">
<xs:restriction base="xs:string">
<xs:pattern value="([A-Za-z0-9+_.-]+/)*[A-Za-z0-9+_.-]+"/>
</xs:restriction>
</xs:simpleType>
<xs:simpleType name="hashtype_choice">
<xs:restriction base="xs:string">
<xs:enumeration value="false"/>
<!-- https://docs.python.org/3/library/hashlib.html#hash-algorithms -->
<xs:enumeration value="md5"/><!-- Not available on FIPS-compliant Python -->
<xs:enumeration value="sha1"/>
<xs:enumeration value="sha224"/>
<xs:enumeration value="sha256"/>
<xs:enumeration value="sha384"/>
<xs:enumeration value="sha512"/>
<xs:enumeration value="blake2b"/>
<xs:enumeration value="blake2s"/>
<!-- The below are only available for more recent versions of system's OpenSSL. -->
<xs:enumeration value="sha3_224"/>
<xs:enumeration value="sha3_256"/>
<xs:enumeration value="sha3_384"/>
<xs:enumeration value="sha3_512"/>
<xs:enumeration value="shake_128"/>
<xs:enumeration value="shake_256"/>
</xs:restriction>
</xs:simpleType>
<xs:element name="bootsync">
<xs:complexType>
<xs:sequence>
<xs:element name="partitions" maxOccurs="1" minOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="part" minOccurs="2" maxOccurs="unbounded">
<xs:complexType>
<xs:attribute name="path" type="diskdev" use="required"/>
<xs:attribute name="mount" type="path" use="required"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
<xs:unique name="partition_unique_mount">
<xs:selector xpath="bootsync:part"/>
<xs:field xpath="@mount"/>
</xs:unique>
<xs:unique name="partition_unique_path">
<xs:selector xpath="bootsync:part"/>
<xs:field xpath="@path"/>
</xs:unique>
</xs:element>
<xs:element name="fileChecks" maxOccurs="1" minOccurs="0">
<xs:complexType>
<xs:sequence>
<xs:element name="file" maxOccurs="unbounded" minOccurs="1">
<xs:complexType>
<xs:simpleContent>
<xs:extension base="relpath">
<xs:attribute name="isKernel" type="xs:boolean"
use="optional" default="false"/>
<xs:attribute name="hashtype" type="hashtype_choice"
use="optional" default="md5"/>
</xs:extension>
</xs:simpleContent>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="hashtype" type="hashtype_choice" use="optional" default="md5"/>
</xs:complexType>
<xs:unique name="filechk_unique">
<xs:selector xpath="bootsync:file"/>
<xs:field xpath="."/>
</xs:unique>
</xs:element>
<xs:element name="syncPaths" maxOccurs="1" minOccurs="1">
<xs:complexType>
<xs:sequence>
<xs:element name="path" maxOccurs="unbounded" minOccurs="1">
<xs:complexType>
<xs:attribute name="source" type="path" use="required"/>
<xs:attribute name="target" type="relpath" use="required"/>
<!-- TODO: make this optional? -->
<xs:attribute name="pattern" type="xs:string" use="required"/>
<xs:attribute name="hashtype" type="hashtype_choice"
use="optional" default="md5"/>
</xs:complexType>
</xs:element>
</xs:sequence>
<xs:attribute name="hashtype" type="hashtype_choice" use="optional" default="md5"/>
</xs:complexType>
<xs:unique name="syncpath_unique_source">
<xs:selector xpath="bootsync:path"/>
<xs:field xpath="@source"/>
</xs:unique>
<xs:unique name="syncpath_unique_target">
<xs:selector xpath="bootsync:path"/>
<xs:field xpath="@target"/>
</xs:unique>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>