'\" t
.TH "SYSTEMD\-VPICK" "1" "" "systemd 256~rc3" "systemd-vpick"
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.SH "NAME"
systemd-vpick \- Resolve paths to "\&.v/" versioned directories
.SH "SYNOPSIS"
.HP \w'\fBsystemd\-vpick\ \fR\fB[OPTIONS...]\fR\fB\ \fR\fB[PATH...]\fR\ 'u
\fBsystemd\-vpick \fR\fB[OPTIONS...]\fR\fB \fR\fB[PATH...]\fR
.SH "DESCRIPTION"
.PP
\fBsystemd\-vpick\fR
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
\fBsystemd.v\fR(7)
logic\&.
.PP
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\&.
.PP
Unless the triple underscore pattern is passed as last component of the path, it is typically necessary to at least specify the
\fB\-\-suffix=\fR
switch to configure the file suffix to look for\&.
.PP
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\&.
.SH "OPTIONS"
.PP
The following options are understood:
.PP
\fB\-\-basename=\fR, \fB\-B\fR
.RS 4
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\&.
.sp
Added in version 256\&.
.RE
.PP
\fB\-V\fR
.RS 4
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\&.
.sp
Added in version 256\&.
.RE
.PP
\fB\-A\fR
.RS 4
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\&.
.sp
Added in version 256\&.
.RE
.PP
\fB\-\-suffix=\fR, \fB\-S\fR
.RS 4
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\&.
.sp
Added in version 256\&.
.RE
.PP
\fB\-\-type=\fR, \fB\-t\fR
.RS 4
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
\fBinode\fR(7)
for details about inode types\&. If this option is used inodes not matching the specified type are filtered and not taken into consideration\&.
.sp
Added in version 256\&.
.RE
.PP
\fB\-\-print=\fR, \fB\-p\fR
.RS 4
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:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If set to
"filename", will print only the filename instead of the full path of the resolved file\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If set to
"version", will print only the version of the resolved file\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
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)\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If set to
"arch", will print only the architecture of the resolved file\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If set to
"tries", will print only the tries left/tries done of the resolved file\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
If set to
"all", will print all of the above in a simple tabular output\&.
.RE
.sp
Added in version 256\&.
.RE
.PP
\fB\-\-resolve=\fR
.RS 4
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\&.
.sp
Added in version 256\&.
.RE
.PP
\fB\-h\fR, \fB\-\-help\fR
.RS 4
Print a short help text and exit\&.
.RE
.PP
\fB\-\-version\fR
.RS 4
Print a short version string and exit\&.
.RE
.SH "EXAMPLES"
.PP
Use a command like the following to automatically pick the newest raw disk image from a
"\&.v/"
directory:
.sp
.if n \{\
.RS 4
.\}
.nf
$ systemd\-vpick \-\-suffix=\&.raw \-\-type=reg /var/lib/machines/quux\&.raw\&.v/
.fi
.if n \{\
.RE
.\}
.PP
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
\fBsystemd.v\fR(7), and then write the path to the newest (by version) file to standard output\&.
.PP
Use a command like the following to automatically pick the newest OS directory tree from a
"\&.v/"
directory:
.sp
.if n \{\
.RS 4
.\}
.nf
$ systemd\-vpick \-\-type=dir /var/lib/machines/waldo\&.v/
.fi
.if n \{\
.RE
.\}
.PP
This will enumerate all directory inodes matching
/var/lib/machines/waldo\&.v/waldo*, filter and sort them according to the rules described in
\fBsystemd.v\fR(7), and then write the path to the newest (by version) directory to standard output\&.
.PP
For further examples see
\fBsystemd.v\fR(7)\&.
.SH "EXIT STATUS"
.PP
On success, 0 is returned, a non\-zero failure code otherwise\&.
.SH "SEE ALSO"
.PP
\fBsystemd\fR(1), \fBsystemd.v\fR(7)