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:

           •   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)