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62 lines
3 KiB
PHP
62 lines
3 KiB
PHP
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Support for file metadata
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~~~~~~~~~~~~~~~~~~~~~~~~~
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Besides regular file and directory structures, Borg can preserve
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* symlinks (stored as symlink, the symlink is not followed)
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* special files:
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* character and block device files (restored via mknod)
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* FIFOs ("named pipes")
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* special file *contents* can be backed up in ``--read-special`` mode.
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By default the metadata to create them with mknod(2), mkfifo(2) etc. is stored.
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* hardlinked regular files, devices, FIFOs (considering all items in the same archive)
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* timestamps in nanosecond precision: mtime, atime, ctime
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* other timestamps: birthtime (on platforms supporting it)
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* permissions:
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* IDs of owning user and owning group
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* names of owning user and owning group (if the IDs can be resolved)
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* Unix Mode/Permissions (u/g/o permissions, suid, sgid, sticky)
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On some platforms additional features are supported:
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.. Yes/No's are grouped by reason/mechanism/reference.
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+-------------------------+----------+-----------+------------+
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| Platform | ACLs | xattr | Flags |
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| | [#acls]_ | [#xattr]_ | [#flags]_ |
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+=========================+==========+===========+============+
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| Linux | Yes | Yes | Yes [1]_ |
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+-------------------------+----------+-----------+------------+
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| Mac OS X | Yes | Yes | Yes (all) |
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+-------------------------+----------+-----------+------------+
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| FreeBSD | Yes | Yes | Yes (all) |
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+-------------------------+----------+-----------+------------+
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| OpenBSD | n/a | n/a | Yes (all) |
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+-------------------------+----------+-----------+------------+
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| NetBSD | n/a | No [2]_ | Yes (all) |
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+-------------------------+----------+-----------+------------+
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| Solaris and derivatives | No [3]_ | No [3]_ | n/a |
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+-------------------------+----------+-----------+------------+
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| Windows (cygwin) | No [4]_ | No | No |
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+-------------------------+----------+-----------+------------+
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Other Unix-like operating systems may work as well, but have not been tested at all.
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Note that most of the platform-dependent features also depend on the file system.
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For example, ntfs-3g on Linux isn't able to convey NTFS ACLs.
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.. [1] Only "nodump", "immutable", "compressed" and "append" are supported.
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Feature request :issue:`618` for more flags.
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.. [2] Feature request :issue:`1332`
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.. [3] Feature request :issue:`1337`
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.. [4] Cygwin tries to map NTFS ACLs to permissions with varying degrees of success.
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.. [#acls] The native access control list mechanism of the OS. This normally limits access to
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non-native ACLs. For example, NTFS ACLs aren't completely accessible on Linux with ntfs-3g.
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.. [#xattr] extended attributes; key-value pairs attached to a file, mainly used by the OS.
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This includes resource forks on Mac OS X.
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.. [#flags] aka *BSD flags*. The Linux set of flags [1]_ is portable across platforms.
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The BSDs define additional flags.
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