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VFS plugin to replicate from one file-system to another. Can be used to seed a mutable file-system with an immutable file-system. The plugin is configure with two paths, a read-only path, and a read-write path. This is an initial implementation that copies files on open. It is not optimized to perform actual copy-on-write, but the result is the same. <vfs> <dir name="immutable"> ... </dir> <dir name="mutable"> ... </dir> <dir name="cow"> <cow ro="/immutable" rw="/mutable"/> </dir> </vfs> Fix #2745
107 lines
2.5 KiB
Plaintext
107 lines
2.5 KiB
Plaintext
#
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# Build
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#
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set build_components {
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core init drivers/timer
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lib/vfs/cow
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server/fs_report
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server/fs_rom
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server/vfs
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test/fs_report
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}
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build $build_components
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create_boot_directory
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#
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# Generate config
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#
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append config {
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<config>
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<parent-provides>
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<service name="CPU"/>
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<service name="IO_MEM"/>
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<service name="IO_PORT"/>
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<service name="IRQ"/>
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<service name="LOG"/>
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<service name="PD"/>
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<service name="ROM"/>
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</parent-provides>
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<default-route>
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<any-service> <parent/> <any-child/> </any-service>
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</default-route>
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<default caps="100"/>
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<start name="timer">
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<resource name="RAM" quantum="1M"/>
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<provides> <service name="Timer"/> </provides>
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</start>
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<start name="config_fs">
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<binary name="vfs"/>
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<resource name="RAM" quantum="4M"/>
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<provides> <service name="File_system"/> </provides>
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<config>
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<vfs>
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<dir name="inline">
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<dir name="test-fs_report">
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<inline name="devices">
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<devices version="initial"/>
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</inline>
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</dir>
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</dir>
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<dir name="ram"> <ram/> </dir>
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<dir name="cow">
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<cow ro="/inline" rw="/ram"/>
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</dir>
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</vfs>
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<policy label_prefix="fs_report -> " root="/cow" writeable="yes"/>
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<policy label_prefix="fs_rom -> " root="/cow/test-fs_report"/>
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</config>
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</start>
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<!--
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All reports sent by 'test-fs_report' are prefixed with the label of the
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component. Hence, they are written to the 'test-fs_report/' subdirectory.
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-->
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<start name="fs_report">
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<resource name="RAM" quantum="4M"/>
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<provides> <service name="Report"/> </provides>
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<config> <vfs> <fs/> </vfs> </config>
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</start>
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<start name="fs_rom">
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<resource name="RAM" quantum="4M"/>
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<provides> <service name="ROM"/> </provides>
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<config/>
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</start>
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<start name="test-fs_report">
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<resource name="RAM" quantum="4M"/>
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<config/>
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<route>
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<service name="ROM" label="devices"> <child name="fs_rom"/> </service>
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<service name="ROM" label="focus"> <child name="fs_rom"/> </service>
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<service name="Report" label="devices"> <child name="fs_report"/> </service>
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<service name="Report" label="focus"> <child name="fs_report"/> </service>
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<any-service> <parent/> <any-child/> </any-service>
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</route>
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</start>
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</config>}
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install_config $config
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#
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# Boot modules
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#
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set boot_modules {
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core ld.lib.so init timer
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fs_report
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fs_rom
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test-fs_report
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vfs_cow.lib.so
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vfs
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}
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build_boot_image $boot_modules
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append qemu_args " -nographic"
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run_genode_until {child "test-fs_report" exited with exit value 0.*\n} 30
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