SYSTEMD-VPICK(1) systemd-vpick SYSTEMD-VPICK(1)
NAME
systemd-vpick - Resolve paths to ".v/" versioned directories
SYNOPSIS
systemd-vpick [OPTIONS...] [PATH...]
DESCRIPTION
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) its specified path is written
unmodified to standard output.
OPTIONS
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.
EXAMPLES
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).
EXIT STATUS
On success, 0 is returned, a non-zero failure code otherwise.
SEE ALSO
systemd(1), systemd.v(7)
systemd 257.9 SYSTEMD-VPICK(1)
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