qemu-ga: Convert invocation documentation to rST

The qemu-ga documentation is currently in qemu-ga.texi in
Texinfo format, which we present to the user as:
 * a qemu-ga manpage
 * a section of the main qemu-doc HTML documentation

Convert the documentation to rST format, and present it to
the user as:
 * a qemu-ga manpage
 * part of the interop/ Sphinx manual

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Tested-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Message-id: 20190905131040.8350-1-peter.maydell@linaro.org

MAINTAINERS

@@ -2040,7 +2040,7 @@ QEMU Guest Agent
 M: Michael Roth <mdroth@linux.vnet.ibm.com>
 S: Maintained
 F: qga/
-F: qemu-ga.texi
+F: docs/interop/qemu-ga.rst
 F: scripts/qemu-guest-agent/
 F: tests/test-qga.c
 F: docs/interop/qemu-ga-ref.texi

Makefile

@@ -325,7 +325,7 @@ endif
 endif
 
 ifdef BUILD_DOCS
-DOCS=qemu-doc.html qemu-doc.txt qemu.1 qemu-img.1 qemu-nbd.8 qemu-ga.8
+DOCS=qemu-doc.html qemu-doc.txt qemu.1 qemu-img.1 qemu-nbd.8 docs/interop/qemu-ga.8
 DOCS+=docs/interop/qemu-qmp-ref.html docs/interop/qemu-qmp-ref.txt docs/interop/qemu-qmp-ref.7
 DOCS+=docs/interop/qemu-ga-ref.html docs/interop/qemu-ga-ref.txt docs/interop/qemu-ga-ref.7
 DOCS+=docs/qemu-block-drivers.7
@@ -783,10 +783,11 @@ DESCS=
 endif
 
 # Note that we manually filter-out the non-Sphinx documentation which
-# is currently built into the docs/interop directory in the build tree.
+# is currently built into the docs/interop directory in the build tree,
+# and also any sphinx-built manpages.
 define install-manual =
 for d in $$(cd $(MANUAL_BUILDDIR) && find $1 -type d); do $(INSTALL_DIR) "$(DESTDIR)$(qemu_docdir)/$$d"; done
-for f in $$(cd $(MANUAL_BUILDDIR) && find $1 -type f -a '!' '(' -name 'qemu-*-qapi.*' -o -name 'qemu-*-ref.*' ')' ); do $(INSTALL_DATA) "$(MANUAL_BUILDDIR)/$$f" "$(DESTDIR)$(qemu_docdir)/$$f"; done
+for f in $$(cd $(MANUAL_BUILDDIR) && find $1 -type f -a '!' '(' -name '*.[0-9]' -o -name 'qemu-*-qapi.*' -o -name 'qemu-*-ref.*' ')' ); do $(INSTALL_DATA) "$(MANUAL_BUILDDIR)/$$f" "$(DESTDIR)$(qemu_docdir)/$$f"; done
 endef
 
 # Note that we deliberately do not install the "devel" manual: it is
@@ -818,7 +819,7 @@ ifdef CONFIG_TRACE_SYSTEMTAP
 	$(INSTALL_DATA) scripts/qemu-trace-stap.1 "$(DESTDIR)$(mandir)/man1"
 endif
 ifneq (,$(findstring qemu-ga,$(TOOLS)))
-	$(INSTALL_DATA) qemu-ga.8 "$(DESTDIR)$(mandir)/man8"
+	$(INSTALL_DATA) docs/interop/qemu-ga.8 "$(DESTDIR)$(mandir)/man8"
 	$(INSTALL_DATA) docs/interop/qemu-ga-ref.html "$(DESTDIR)$(qemu_docdir)"
 	$(INSTALL_DATA) docs/interop/qemu-ga-ref.txt "$(DESTDIR)$(qemu_docdir)"
 	$(INSTALL_DATA) docs/interop/qemu-ga-ref.7 "$(DESTDIR)$(mandir)/man7"
@@ -977,18 +978,22 @@ docs/version.texi: $(SRC_PATH)/VERSION config-host.mak
 sphinxdocs: $(MANUAL_BUILDDIR)/devel/index.html $(MANUAL_BUILDDIR)/interop/index.html $(MANUAL_BUILDDIR)/specs/index.html
 
 # Canned command to build a single manual
-build-manual = $(call quiet-command,sphinx-build $(if $(V),,-q) -W -n -b html -D version=$(VERSION) -D release="$(FULL_VERSION)" -d .doctrees/$1 $(SRC_PATH)/docs/$1 $(MANUAL_BUILDDIR)/$1 ,"SPHINX","$(MANUAL_BUILDDIR)/$1")
+# Arguments: $1 = manual name, $2 = Sphinx builder ('html' or 'man')
+build-manual = $(call quiet-command,CONFDIR="$(qemu_confdir)" sphinx-build $(if $(V),,-q) -W -n -b $2 -D version=$(VERSION) -D release="$(FULL_VERSION)" -d .doctrees/$1 $(SRC_PATH)/docs/$1 $(MANUAL_BUILDDIR)/$1 ,"SPHINX","$(MANUAL_BUILDDIR)/$1")
 # We assume all RST files in the manual's directory are used in it
 manual-deps = $(wildcard $(SRC_PATH)/docs/$1/*.rst) $(SRC_PATH)/docs/$1/conf.py $(SRC_PATH)/docs/conf.py
 
 $(MANUAL_BUILDDIR)/devel/index.html: $(call manual-deps,devel)
-	$(call build-manual,devel)
+	$(call build-manual,devel,html)
 
 $(MANUAL_BUILDDIR)/interop/index.html: $(call manual-deps,interop)
-	$(call build-manual,interop)
+	$(call build-manual,interop,html)
 
 $(MANUAL_BUILDDIR)/specs/index.html: $(call manual-deps,specs)
-	$(call build-manual,specs)
+	$(call build-manual,specs,html)
+
+$(MANUAL_BUILDDIR)/interop/qemu-ga.8: $(call manual-deps,interop)
+	$(call build-manual,interop,man)
 
 qemu-options.texi: $(SRC_PATH)/qemu-options.hx $(SRC_PATH)/scripts/hxtool
 	$(call quiet-command,sh $(SRC_PATH)/scripts/hxtool -t < $< > $@,"GEN","$@")
@@ -1013,7 +1018,6 @@ qemu.1: qemu-option-trace.texi
 qemu-img.1: qemu-img.texi qemu-option-trace.texi qemu-img-cmds.texi
 fsdev/virtfs-proxy-helper.1: fsdev/virtfs-proxy-helper.texi
 qemu-nbd.8: qemu-nbd.texi qemu-option-trace.texi
-qemu-ga.8: qemu-ga.texi
 docs/qemu-block-drivers.7: docs/qemu-block-drivers.texi
 docs/qemu-cpu-models.7: docs/qemu-cpu-models.texi
 scripts/qemu-trace-stap.1: scripts/qemu-trace-stap.texi
@@ -1026,7 +1030,7 @@ txt: qemu-doc.txt docs/interop/qemu-qmp-ref.txt docs/interop/qemu-ga-ref.txt
 qemu-doc.html qemu-doc.info qemu-doc.pdf qemu-doc.txt: \
 	qemu-img.texi qemu-nbd.texi qemu-options.texi \
 	qemu-tech.texi qemu-option-trace.texi \
-	qemu-deprecated.texi qemu-monitor.texi qemu-img-cmds.texi qemu-ga.texi \
+	qemu-deprecated.texi qemu-monitor.texi qemu-img-cmds.texi \
 	qemu-monitor-info.texi docs/qemu-block-drivers.texi \
 	docs/qemu-cpu-models.texi docs/security.texi
 

docs/conf.py

@@ -115,6 +115,14 @@
 # with "option::" in the document being processed. Turn that off.
 suppress_warnings = ["ref.option"]
 
+# The rst_epilog fragment is effectively included in every rST file.
+# We use it to define substitutions based on build config that
+# can then be used in the documentation. The fallback if the
+# environment variable is not set is for the benefit of readthedocs
+# style document building; our Makefile always sets the variable.
+confdir = os.getenv('CONFDIR', "/etc/qemu")
+rst_epilog = ".. |CONFDIR| replace:: ``" + confdir + "``\n"
+
 # -- Options for HTML output ----------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
@@ -192,14 +200,8 @@
 
 
 # -- Options for manual page output ---------------------------------------
-
-# One entry per manual page. List of tuples
-# (source start file, name, description, authors, manual section).
-man_pages = [
-    (master_doc, 'qemu', u'QEMU Documentation',
-     [author], 1)
-]
-
+# Individual manual/conf.py can override this to create man pages
+man_pages = []
 
 # -- Options for Texinfo output -------------------------------------------
 

docs/interop/conf.py

@@ -13,3 +13,10 @@
 # This slightly misuses the 'description', but is the best way to get
 # the manual title to appear in the sidebar.
 html_theme_options['description'] = u'System Emulation Management and Interoperability Guide'
+
+# One entry per manual page. List of tuples
+# (source start file, name, description, authors, manual section).
+man_pages = [
+    ('qemu-ga', 'qemu-ga', u'QEMU Guest Agent',
+     ['Michael Roth <mdroth@linux.vnet.ibm.com>'], 8)
+]

docs/interop/index.rst

@@ -15,5 +15,6 @@ Contents:
    bitmaps
    live-block-operations
    pr-helper
+   qemu-ga
    vhost-user
    vhost-user-gpu

docs/interop/qemu-ga.rst

@@ -0,0 +1,133 @@
+QEMU Guest Agent
+================
+
+Synopsis
+--------
+
+**qemu-ga** [*OPTIONS*]
+
+Description
+-----------
+
+The QEMU Guest Agent is a daemon intended to be run within virtual
+machines. It allows the hypervisor host to perform various operations
+in the guest, such as:
+
+- get information from the guest
+- set the guest's system time
+- read/write a file
+- sync and freeze the filesystems
+- suspend the guest
+- reconfigure guest local processors
+- set user's password
+- ...
+
+qemu-ga will read a system configuration file on startup (located at
+|CONFDIR|\ ``/qemu-ga.conf`` by default), then parse remaining
+configuration options on the command line. For the same key, the last
+option wins, but the lists accumulate (see below for configuration
+file format).
+
+Options
+-------
+
+.. program:: qemu-ga
+
+.. option:: -m, --method=METHOD
+
+  Transport method: one of ``unix-listen``, ``virtio-serial``, or
+  ``isa-serial`` (``virtio-serial`` is the default).
+
+.. option:: -p, --path=PATH
+
+  Device/socket path (the default for virtio-serial is
+  ``/dev/virtio-ports/org.qemu.guest_agent.0``,
+  the default for isa-serial is ``/dev/ttyS0``)
+
+.. option:: -l, --logfile=PATH
+
+  Set log file path (default is stderr).
+
+.. option:: -f, --pidfile=PATH
+
+  Specify pid file (default is ``/var/run/qemu-ga.pid``).
+
+.. option:: -F, --fsfreeze-hook=PATH
+
+  Enable fsfreeze hook. Accepts an optional argument that specifies
+  script to run on freeze/thaw. Script will be called with
+  'freeze'/'thaw' arguments accordingly (default is
+  |CONFDIR|\ ``/fsfreeze-hook``). If using -F with an argument, do
+  not follow -F with a space (for example:
+  ``-F/var/run/fsfreezehook.sh``).
+
+.. option:: -t, --statedir=PATH
+
+  Specify the directory to store state information (absolute paths only,
+  default is ``/var/run``).
+
+.. option:: -v, --verbose
+
+  Log extra debugging information.
+
+.. option:: -V, --version
+
+  Print version information and exit.
+
+.. option:: -d, --daemon
+
+  Daemonize after startup (detach from terminal).
+
+.. option:: -b, --blacklist=LIST
+
+  Comma-separated list of RPCs to disable (no spaces, ``?`` to list
+  available RPCs).
+
+.. option:: -D, --dump-conf
+
+  Dump the configuration in a format compatible with ``qemu-ga.conf``
+  and exit.
+
+.. option:: -h, --help
+
+  Display this help and exit.
+
+Files
+-----
+
+
+The syntax of the ``qemu-ga.conf`` configuration file follows the
+Desktop Entry Specification, here is a quick summary: it consists of
+groups of key-value pairs, interspersed with comments.
+
+::
+
+    # qemu-ga configuration sample
+    [general]
+    daemonize = 0
+    pidfile = /var/run/qemu-ga.pid
+    verbose = 0
+    method = virtio-serial
+    path = /dev/virtio-ports/org.qemu.guest_agent.0
+    statedir = /var/run
+
+The list of keys follows the command line options:
+
+=============  ===========
+Key             Key type
+=============  ===========
+daemon         boolean
+method         string
+path           string
+logfile        string
+pidfile        string
+fsfreeze-hook  string
+statedir       string
+verbose        boolean
+blacklist      string list
+=============  ===========
+
+See also
+--------
+
+:manpage:`qemu(1)`

qemu-doc.texi

@@ -2535,11 +2535,6 @@ so should only be used with trusted guest OS.
 
 @c man end
 
-@node QEMU Guest Agent
-@chapter QEMU Guest Agent invocation
-
-@include qemu-ga.texi
-
 @node QEMU User space emulator
 @chapter QEMU User space emulator
 

qemu-ga.texi

@@ -1,137 +0,0 @@
-@example
-@c man begin SYNOPSIS
-@command{qemu-ga} [@var{OPTIONS}]
-@c man end
-@end example
-
-@c man begin DESCRIPTION
-
-The QEMU Guest Agent is a daemon intended to be run within virtual
-machines. It allows the hypervisor host to perform various operations
-in the guest, such as:
-
-@itemize
-@item
-get information from the guest
-@item
-set the guest's system time
-@item
-read/write a file
-@item
-sync and freeze the filesystems
-@item
-suspend the guest
-@item
-reconfigure guest local processors
-@item
-set user's password
-@item
-...
-@end itemize
-
-qemu-ga will read a system configuration file on startup (located at
-@file{@value{CONFDIR}/qemu-ga.conf} by default), then parse remaining
-configuration options on the command line. For the same key, the last
-option wins, but the lists accumulate (see below for configuration
-file format).
-
-@c man end
-
-@c man begin OPTIONS
-@table @option
-@item -m, --method=@var{method}
-  Transport method: one of @samp{unix-listen}, @samp{virtio-serial}, or
-  @samp{isa-serial} (@samp{virtio-serial} is the default).
-
-@item -p, --path=@var{path}
-  Device/socket path (the default for virtio-serial is
-  @samp{/dev/virtio-ports/org.qemu.guest_agent.0},
-  the default for isa-serial is @samp{/dev/ttyS0})
-
-@item -l, --logfile=@var{path}
-  Set log file path (default is stderr).
-
-@item -f, --pidfile=@var{path}
-  Specify pid file (default is @samp{/var/run/qemu-ga.pid}).
-
-@item -F, --fsfreeze-hook=@var{path}
-  Enable fsfreeze hook. Accepts an optional argument that specifies
-  script to run on freeze/thaw. Script will be called with
-  'freeze'/'thaw' arguments accordingly (default is
-  @samp{@value{CONFDIR}/fsfreeze-hook}). If using -F with an argument, do
-  not follow -F with a space (for example:
-  @samp{-F/var/run/fsfreezehook.sh}).
-
-@item -t, --statedir=@var{path}
-  Specify the directory to store state information (absolute paths only,
-  default is @samp{/var/run}).
-
-@item -v, --verbose
-  Log extra debugging information.
-
-@item -V, --version
-  Print version information and exit.
-
-@item -d, --daemon
-  Daemonize after startup (detach from terminal).
-
-@item -b, --blacklist=@var{list}
-  Comma-separated list of RPCs to disable (no spaces, @samp{?} to list
-  available RPCs).
-
-@item -D, --dump-conf
-  Dump the configuration in a format compatible with @file{qemu-ga.conf}
-  and exit.
-
-@item -h, --help
-  Display this help and exit.
-@end table
-
-@c man end
-
-@c man begin FILES
-
-The syntax of the @file{qemu-ga.conf} configuration file follows the
-Desktop Entry Specification, here is a quick summary: it consists of
-groups of key-value pairs, interspersed with comments.
-
-@example
-# qemu-ga configuration sample
-[general]
-daemonize = 0
-pidfile = /var/run/qemu-ga.pid
-verbose = 0
-method = virtio-serial
-path = /dev/virtio-ports/org.qemu.guest_agent.0
-statedir = /var/run
-@end example
-
-The list of keys follows the command line options:
-@table @option
-@item daemon= boolean
-@item method= string
-@item path= string
-@item logfile= string
-@item pidfile= string
-@item fsfreeze-hook= string
-@item statedir= string
-@item verbose= boolean
-@item blacklist= string list
-@end table
-
-@c man end
-
-@ignore
-
-@setfilename qemu-ga
-@settitle QEMU Guest Agent
-
-@c man begin AUTHOR
-Michael Roth <mdroth@linux.vnet.ibm.com>
-@c man end
-
-@c man begin SEEALSO
-qemu(1)
-@c man end
-
-@end ignore