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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | EXIT STATUS | SEE ALSO | COLOPHON |
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SYSTEMD-VPICK(1) systemd-vpick SYSTEMD-VPICK(1)
systemd-vpick - Resolve paths to ".v/" versioned directories
systemd-vpick [OPTIONS...] [PATH...]
systemd-vpick resolves a file system path referencing a ".v/"
versioned directory to a path to the newest (by version) file
contained therein. This tool provides a command line interface
for the systemd.v(7) logic.
The tool expects a path to a ".v/" directory as argument (either
directly, or with a triple underscore pattern as final
component). It then determines the newest file contained in that
directory, and writes its path to standard output.
Unless the triple underscore pattern is passed as last component
of the path, it is typically necessary to at least specify the
--suffix= switch to configure the file suffix to look for.
If the specified path does not reference a ".v/" path (i.e.
neither the final component ends in ".v", nor the penultimate
does or the final one does contain a triple underscore) it
specified path is written unmodified to standard output.
The following options are understood:
--basename=, -B
Overrides the "basename" of the files to look for, i.e. the
part to the left of the variable part of the filenames.
Normally this is derived automatically from the filename of
the ".v" component of the specified path, or from the triple
underscore pattern in the last component of the specified
path.
Added in version 256.
-V
Explicitly configures the version to select. If specified, a
filename with the specified version string will be looked
for, instead of the newest version available.
Added in version 256.
-A
Explicitly configures the architecture to select. If
specified, a filename with the specified architecture
identifier will be looked for. If not specified only
filenames with a locally supported architecture are
considered, or those without any architecture identifier.
Added in version 256.
--suffix=, -S
Configures the suffix of the filenames to consider. For the
".v/" logic it is necessary to specify the suffix to look
for, and the ".v/" component must also carry the suffix
immediately before ".v" in its name.
Added in version 256.
--type=, -t
Configures the inode type to look for in the ".v/" directory.
Takes one of "reg", "dir", "sock", "fifo", "blk", "chr",
"lnk" as argument, each identifying an inode type. See
inode(7) for details about inode types. If this option is
used inodes not matching the specified type are filtered and
not taken into consideration.
Added in version 256.
--print=, -p
Configures what precisely to write to standard output. If not
specified prints the full, resolved path of the newest
matching file in the ".v/" directory. This switch can be set
to one of the following:
• If set to "filename", will print only the filename
instead of the full path of the resolved file.
• If set to "version", will print only the version of the
resolved file.
• If set to "type", will print only the inode type of the
resolved file (i.e. a string such as "reg" for regular
files, or "dir" for directories).
• If set to "arch", will print only the architecture of the
resolved file.
• If set to "tries", will print only the tries left/tries
done of the resolved file.
• If set to "all", will print all of the above in a simple
tabular output.
Added in version 256.
--resolve=
Takes a boolean argument. If true the path to the versioned
file is fully canonicalized (i.e. symlinks resolved, and
redundant path components removed) before it is shown. If
false (the default) this is not done, and the path is shown
without canonicalization.
Added in version 256.
-h, --help
Print a short help text and exit.
--version
Print a short version string and exit.
Use a command like the following to automatically pick the newest
raw disk image from a ".v/" directory:
$ systemd-vpick --suffix=.raw --type=reg /var/lib/machines/quux.raw.v/
This will enumerate all regular files matching
/var/lib/machines/quux.raw.v/quux*.raw, filter and sort them
according to the rules described in systemd.v(7), and then write
the path to the newest (by version) file to standard output.
Use a command like the following to automatically pick the newest
OS directory tree from a ".v/" directory:
$ systemd-vpick --type=dir /var/lib/machines/waldo.v/
This will enumerate all directory inodes matching
/var/lib/machines/waldo.v/waldo*, filter and sort them according
to the rules described in systemd.v(7), and then write the path
to the newest (by version) directory to standard output.
For further examples see systemd.v(7).
On success, 0 is returned, a non-zero failure code otherwise.
systemd(1), systemd.v(7)
This page is part of the systemd (systemd system and service
manager) project. Information about the project can be found at
⟨http://www.freedesktop.org/wiki/Software/systemd⟩. If you have
a bug report for this manual page, see
⟨http://www.freedesktop.org/wiki/Software/systemd/#bugreports⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/systemd/systemd.git⟩ on 2024-06-14. (At that
time, the date of the most recent commit that was found in the
repository was 2024-06-13.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
systemd 257~devel SYSTEMD-VPICK(1)
Pages that refer to this page: systemd.directives(7), systemd.index(7), systemd.v(7)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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