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) it 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:

           o   If set to "filename", will print only the filename instead of
               the full path of the resolved file.

           o   If set to "version", will print only the version of the
               resolved file.

           o   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).

           o   If set to "arch", will print only the architecture of the
               resolved file.

           o   If set to "tries", will print only the tries left/tries done of
               the resolved file.

           o   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 256.7                                                 SYSTEMD-VPICK(1)