[Qemu-devel] [PATCH 0/3] qemu-ga: change default state dir to /var/run

[Qemu-devel] [PATCH 0/3] qemu-ga: change default state dir to /var/run

[Luiz Capitulino]

Also allow users to change the default at configure time. Please, check
individual patches for more details.

Luiz Capitulino (3):
  configure: guest_agent -> qemuga
  configure: add --guest-agent-statedir
  qemu-ga: use state dir from CONFIG_QEMUGA_STATEDIR

 configure | 16 +++++++++++-----
 qemu-ga.c |  4 ++--
 2 files changed, 13 insertions(+), 7 deletions(-)

-- 
1.7.12.315.g682ce8b

[Qemu-devel] [PATCH 1/3] configure: guest_agent -> qemuga

[Luiz Capitulino]

Next commit will add a new qemu-ga variable in configure, having
guest_agent as a prefix is too long, let's use qemuga instead.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 configure | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/configure b/configure
index 8f99b7b..4cfcdc6 100755
--- a/configure
+++ b/configure
@@ -214,7 +214,7 @@ smartcard_nss=""
 usb_redir=""
 opengl=""
 zlib="yes"
-guest_agent="yes"
+qemuga="yes"
 want_tools="yes"
 libiscsi=""
 coroutine=""
@@ -844,9 +844,9 @@ for opt do
   ;;
   --disable-zlib-test) zlib="no"
   ;;
-  --enable-guest-agent) guest_agent="yes"
+  --enable-guest-agent) qemuga="yes"
   ;;
-  --disable-guest-agent) guest_agent="no"
+  --disable-guest-agent) qemuga="no"
   ;;
   --enable-tools) want_tools="yes"
   ;;
@@ -3059,7 +3059,7 @@ if test "$softmmu" = yes ; then
     fi
   fi
   if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
-    if [ "$guest_agent" = "yes" ]; then
+    if [ "$qemuga" = "yes" ]; then
       tools="qemu-ga\$(EXESUF) $tools"
     fi
   fi
@@ -3167,7 +3167,7 @@ echo "nss used          $smartcard_nss"
 echo "usb net redir     $usb_redir"
 echo "OpenGL support    $opengl"
 echo "libiscsi support  $libiscsi"
-echo "build guest agent $guest_agent"
+echo "build guest agent $qemuga"
 echo "seccomp support   $seccomp"
 echo "coroutine backend $coroutine_backend"
 
-- 
1.7.12.315.g682ce8b

[Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Luiz Capitulino]

Defaults to /var/run.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 configure | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/configure b/configure
index 4cfcdc6..4f3d2ed 100755
--- a/configure
+++ b/configure
@@ -215,6 +215,7 @@ usb_redir=""
 opengl=""
 zlib="yes"
 qemuga="yes"
+qemuga_statedir="/var/run"
 want_tools="yes"
 libiscsi=""
 coroutine=""
@@ -628,6 +629,8 @@ for opt do
   ;;
   --sysconfdir=*) sysconfdir="$optarg"
   ;;
+  --guest-agent-statedir=*) qemuga_statedir="$optarg"
+  ;;
   --sbindir=*|--sharedstatedir=*|--localstatedir=*|\
   --oldincludedir=*|--datarootdir=*|--infodir=*|--localedir=*|\
   --htmldir=*|--dvidir=*|--pdfdir=*|--psdir=*)
@@ -1022,6 +1025,7 @@ echo "  --datadir=PATH           install firmware in PATH$confsuffix"
 echo "  --docdir=PATH            install documentation in PATH$confsuffix"
 echo "  --bindir=PATH            install binaries in PATH"
 echo "  --sysconfdir=PATH        install config in PATH$confsuffix"
+echo "  --guest-agent-statedir=PATH   set Guest Agent state directory to PATH"
 echo "  --with-confsuffix=SUFFIX suffix for QEMU data inside datadir and sysconfdir [$confsuffix]"
 echo "  --enable-debug-tcg       enable TCG debugging"
 echo "  --disable-debug-tcg      disable TCG debugging (default)"
@@ -3086,6 +3090,7 @@ echo "library directory `eval echo $libdir`"
 echo "libexec directory `eval echo $libexecdir`"
 echo "include directory `eval echo $includedir`"
 echo "config directory  `eval echo $sysconfdir`"
+echo "qemu-ga state directory  $qemuga_statedir"
 if test "$mingw32" = "no" ; then
 echo "Manual directory  `eval echo $mandir`"
 echo "ELF interp prefix $interp_prefix"
@@ -3196,6 +3201,7 @@ echo "qemu_datadir=$qemu_datadir" >> $config_host_mak
 echo "qemu_docdir=$qemu_docdir" >> $config_host_mak
 echo "CONFIG_QEMU_HELPERDIR=\"$libexecdir\"" >> $config_host_mak
 
+echo "CONFIG_QEMUGA_STATEDIR=\"$qemuga_statedir\"" >> $config_host_mak
 echo "ARCH=$ARCH" >> $config_host_mak
 if test "$debug_tcg" = "yes" ; then
   echo "CONFIG_DEBUG_TCG=y" >> $config_host_mak
-- 
1.7.12.315.g682ce8b

[Qemu-devel] [PATCH 3/3] qemu-ga: use state dir from CONFIG_QEMUGA_STATEDIR

[Luiz Capitulino]

Has the side effect of changing the default directory used to
save the freeze status file from /tmp to /var/run.

This is a beneficial change for two reasons:

 1. FHS states that programs must not assume that files in /tmp will
    still exist between invocations of the program. This defeats
	the purpose of the freeze status file

 2. FHS dictates that /var/run should be cleaned on boot, this
    automatically cleans up any stale file

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 qemu-ga.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/qemu-ga.c b/qemu-ga.c
index b747470..cbfd021 100644
--- a/qemu-ga.c
+++ b/qemu-ga.c
@@ -40,8 +40,8 @@
 #else
 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
 #endif
-#define QGA_PIDFILE_DEFAULT "/var/run/qemu-ga.pid"
-#define QGA_STATEDIR_DEFAULT "/tmp"
+#define QGA_PIDFILE_DEFAULT  CONFIG_QEMUGA_STATEDIR "/qemu-ga.pid"
+#define QGA_STATEDIR_DEFAULT CONFIG_QEMUGA_STATEDIR
 #define QGA_SENTINEL_BYTE 0xFF
 
 struct GAState {
-- 
1.7.12.315.g682ce8b

Re: [Qemu-devel] [PATCH 1/3] configure: guest_agent -> qemuga

[Michael Roth]

On Wed, Oct 03, 2012 at 02:24:17PM -0300, Luiz Capitulino wrote:
> Next commit will add a new qemu-ga variable in configure, having
> guest_agent as a prefix is too long, let's use qemuga instead.
> 
> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

Acked-by: Michael Roth <mdroth@linux.vnet.ibm.com>

> ---
>  configure | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/configure b/configure
> index 8f99b7b..4cfcdc6 100755
> --- a/configure
> +++ b/configure
> @@ -214,7 +214,7 @@ smartcard_nss=""
>  usb_redir=""
>  opengl=""
>  zlib="yes"
> -guest_agent="yes"
> +qemuga="yes"
>  want_tools="yes"
>  libiscsi=""
>  coroutine=""
> @@ -844,9 +844,9 @@ for opt do
>    ;;
>    --disable-zlib-test) zlib="no"
>    ;;
> -  --enable-guest-agent) guest_agent="yes"
> +  --enable-guest-agent) qemuga="yes"
>    ;;
> -  --disable-guest-agent) guest_agent="no"
> +  --disable-guest-agent) qemuga="no"
>    ;;
>    --enable-tools) want_tools="yes"
>    ;;
> @@ -3059,7 +3059,7 @@ if test "$softmmu" = yes ; then
>      fi
>    fi
>    if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
> -    if [ "$guest_agent" = "yes" ]; then
> +    if [ "$qemuga" = "yes" ]; then
>        tools="qemu-ga\$(EXESUF) $tools"
>      fi
>    fi
> @@ -3167,7 +3167,7 @@ echo "nss used          $smartcard_nss"
>  echo "usb net redir     $usb_redir"
>  echo "OpenGL support    $opengl"
>  echo "libiscsi support  $libiscsi"
> -echo "build guest agent $guest_agent"
> +echo "build guest agent $qemuga"
>  echo "seccomp support   $seccomp"
>  echo "coroutine backend $coroutine_backend"
> 
> -- 
> 1.7.12.315.g682ce8b
> 
> 

Re: [Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Michael Roth]

On Wed, Oct 03, 2012 at 02:24:18PM -0300, Luiz Capitulino wrote:
> Defaults to /var/run.
> 
> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
> ---
>  configure | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/configure b/configure
> index 4cfcdc6..4f3d2ed 100755
> --- a/configure
> +++ b/configure
> @@ -215,6 +215,7 @@ usb_redir=""
>  opengl=""
>  zlib="yes"
>  qemuga="yes"
> +qemuga_statedir="/var/run"
>  want_tools="yes"
>  libiscsi=""
>  coroutine=""
> @@ -628,6 +629,8 @@ for opt do
>    ;;
>    --sysconfdir=*) sysconfdir="$optarg"
>    ;;
> +  --guest-agent-statedir=*) qemuga_statedir="$optarg"
> +  ;;
>    --sbindir=*|--sharedstatedir=*|--localstatedir=*|\
>    --oldincludedir=*|--datarootdir=*|--infodir=*|--localedir=*|\
>    --htmldir=*|--dvidir=*|--pdfdir=*|--psdir=*)
> @@ -1022,6 +1025,7 @@ echo "  --datadir=PATH           install firmware in PATH$confsuffix"
>  echo "  --docdir=PATH            install documentation in PATH$confsuffix"
>  echo "  --bindir=PATH            install binaries in PATH"
>  echo "  --sysconfdir=PATH        install config in PATH$confsuffix"
> +echo "  --guest-agent-statedir=PATH   set Guest Agent state directory to PATH"
>  echo "  --with-confsuffix=SUFFIX suffix for QEMU data inside datadir and sysconfdir [$confsuffix]"
>  echo "  --enable-debug-tcg       enable TCG debugging"
>  echo "  --disable-debug-tcg      disable TCG debugging (default)"
> @@ -3086,6 +3090,7 @@ echo "library directory `eval echo $libdir`"
>  echo "libexec directory `eval echo $libexecdir`"
>  echo "include directory `eval echo $includedir`"
>  echo "config directory  `eval echo $sysconfdir`"
> +echo "qemu-ga state directory  $qemuga_statedir"

Would prefer this get moved down, under "build guest agent"

Looks good otherwise.

>  if test "$mingw32" = "no" ; then
>  echo "Manual directory  `eval echo $mandir`"
>  echo "ELF interp prefix $interp_prefix"
> @@ -3196,6 +3201,7 @@ echo "qemu_datadir=$qemu_datadir" >> $config_host_mak
>  echo "qemu_docdir=$qemu_docdir" >> $config_host_mak
>  echo "CONFIG_QEMU_HELPERDIR=\"$libexecdir\"" >> $config_host_mak
> 
> +echo "CONFIG_QEMUGA_STATEDIR=\"$qemuga_statedir\"" >> $config_host_mak
>  echo "ARCH=$ARCH" >> $config_host_mak
>  if test "$debug_tcg" = "yes" ; then
>    echo "CONFIG_DEBUG_TCG=y" >> $config_host_mak
> -- 
> 1.7.12.315.g682ce8b
> 

Re: [Qemu-devel] [PATCH 3/3] qemu-ga: use state dir from CONFIG_QEMUGA_STATEDIR

[Michael Roth]

On Wed, Oct 03, 2012 at 02:24:19PM -0300, Luiz Capitulino wrote:
> Has the side effect of changing the default directory used to
> save the freeze status file from /tmp to /var/run.
> 
> This is a beneficial change for two reasons:
> 
>  1. FHS states that programs must not assume that files in /tmp will
>     still exist between invocations of the program. This defeats
> 	the purpose of the freeze status file
> 
>  2. FHS dictates that /var/run should be cleaned on boot, this
>     automatically cleans up any stale file
> 
> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

Acked-by: Michael Roth <mdroth@linux.vnet.ibm.com>

> ---
>  qemu-ga.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/qemu-ga.c b/qemu-ga.c
> index b747470..cbfd021 100644
> --- a/qemu-ga.c
> +++ b/qemu-ga.c
> @@ -40,8 +40,8 @@
>  #else
>  #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
>  #endif
> -#define QGA_PIDFILE_DEFAULT "/var/run/qemu-ga.pid"
> -#define QGA_STATEDIR_DEFAULT "/tmp"
> +#define QGA_PIDFILE_DEFAULT  CONFIG_QEMUGA_STATEDIR "/qemu-ga.pid"
> +#define QGA_STATEDIR_DEFAULT CONFIG_QEMUGA_STATEDIR
>  #define QGA_SENTINEL_BYTE 0xFF
> 
>  struct GAState {
> -- 
> 1.7.12.315.g682ce8b
> 
> 

Re: [Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Michael Roth]

On Wed, Oct 03, 2012 at 02:24:18PM -0300, Luiz Capitulino wrote:
> Defaults to /var/run.
> 
> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

Since this has the effect of changing both the default directory for
state and well as the pid file, maybe we should s@state@state/pidfile@
the human-readable descriptions?

> ---
>  configure | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/configure b/configure
> index 4cfcdc6..4f3d2ed 100755
> --- a/configure
> +++ b/configure
> @@ -215,6 +215,7 @@ usb_redir=""
>  opengl=""
>  zlib="yes"
>  qemuga="yes"
> +qemuga_statedir="/var/run"
>  want_tools="yes"
>  libiscsi=""
>  coroutine=""
> @@ -628,6 +629,8 @@ for opt do
>    ;;
>    --sysconfdir=*) sysconfdir="$optarg"
>    ;;
> +  --guest-agent-statedir=*) qemuga_statedir="$optarg"
> +  ;;
>    --sbindir=*|--sharedstatedir=*|--localstatedir=*|\
>    --oldincludedir=*|--datarootdir=*|--infodir=*|--localedir=*|\
>    --htmldir=*|--dvidir=*|--pdfdir=*|--psdir=*)
> @@ -1022,6 +1025,7 @@ echo "  --datadir=PATH           install firmware in PATH$confsuffix"
>  echo "  --docdir=PATH            install documentation in PATH$confsuffix"
>  echo "  --bindir=PATH            install binaries in PATH"
>  echo "  --sysconfdir=PATH        install config in PATH$confsuffix"
> +echo "  --guest-agent-statedir=PATH   set Guest Agent state directory to PATH"
>  echo "  --with-confsuffix=SUFFIX suffix for QEMU data inside datadir and sysconfdir [$confsuffix]"
>  echo "  --enable-debug-tcg       enable TCG debugging"
>  echo "  --disable-debug-tcg      disable TCG debugging (default)"
> @@ -3086,6 +3090,7 @@ echo "library directory `eval echo $libdir`"
>  echo "libexec directory `eval echo $libexecdir`"
>  echo "include directory `eval echo $includedir`"
>  echo "config directory  `eval echo $sysconfdir`"
> +echo "qemu-ga state directory  $qemuga_statedir"
>  if test "$mingw32" = "no" ; then
>  echo "Manual directory  `eval echo $mandir`"
>  echo "ELF interp prefix $interp_prefix"
> @@ -3196,6 +3201,7 @@ echo "qemu_datadir=$qemu_datadir" >> $config_host_mak
>  echo "qemu_docdir=$qemu_docdir" >> $config_host_mak
>  echo "CONFIG_QEMU_HELPERDIR=\"$libexecdir\"" >> $config_host_mak
> 
> +echo "CONFIG_QEMUGA_STATEDIR=\"$qemuga_statedir\"" >> $config_host_mak
>  echo "ARCH=$ARCH" >> $config_host_mak
>  if test "$debug_tcg" = "yes" ; then
>    echo "CONFIG_DEBUG_TCG=y" >> $config_host_mak
> -- 
> 1.7.12.315.g682ce8b
> 

Re: [Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Paolo Bonzini]

Il 03/10/2012 19:24, Luiz Capitulino ha scritto:
> Defaults to /var/run.

Please add instead --localstatedir (defaulting to ${prefix}/var), and
make the guest agent's directory /run inside that one.  Packagers
already know to override --localstatedir=/var, in some cases macros even
do it automatically.

Paolo

> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
> ---
>  configure | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/configure b/configure
> index 4cfcdc6..4f3d2ed 100755
> --- a/configure
> +++ b/configure
> @@ -215,6 +215,7 @@ usb_redir=""
>  opengl=""
>  zlib="yes"
>  qemuga="yes"
> +qemuga_statedir="/var/run"
>  want_tools="yes"
>  libiscsi=""
>  coroutine=""
> @@ -628,6 +629,8 @@ for opt do
>    ;;
>    --sysconfdir=*) sysconfdir="$optarg"
>    ;;
> +  --guest-agent-statedir=*) qemuga_statedir="$optarg"
> +  ;;
>    --sbindir=*|--sharedstatedir=*|--localstatedir=*|\
>    --oldincludedir=*|--datarootdir=*|--infodir=*|--localedir=*|\
>    --htmldir=*|--dvidir=*|--pdfdir=*|--psdir=*)
> @@ -1022,6 +1025,7 @@ echo "  --datadir=PATH           install firmware in PATH$confsuffix"
>  echo "  --docdir=PATH            install documentation in PATH$confsuffix"
>  echo "  --bindir=PATH            install binaries in PATH"
>  echo "  --sysconfdir=PATH        install config in PATH$confsuffix"
> +echo "  --guest-agent-statedir=PATH   set Guest Agent state directory to PATH"
>  echo "  --with-confsuffix=SUFFIX suffix for QEMU data inside datadir and sysconfdir [$confsuffix]"
>  echo "  --enable-debug-tcg       enable TCG debugging"
>  echo "  --disable-debug-tcg      disable TCG debugging (default)"
> @@ -3086,6 +3090,7 @@ echo "library directory `eval echo $libdir`"
>  echo "libexec directory `eval echo $libexecdir`"
>  echo "include directory `eval echo $includedir`"
>  echo "config directory  `eval echo $sysconfdir`"
> +echo "qemu-ga state directory  $qemuga_statedir"
>  if test "$mingw32" = "no" ; then
>  echo "Manual directory  `eval echo $mandir`"
>  echo "ELF interp prefix $interp_prefix"
> @@ -3196,6 +3201,7 @@ echo "qemu_datadir=$qemu_datadir" >> $config_host_mak
>  echo "qemu_docdir=$qemu_docdir" >> $config_host_mak
>  echo "CONFIG_QEMU_HELPERDIR=\"$libexecdir\"" >> $config_host_mak
>  
> +echo "CONFIG_QEMUGA_STATEDIR=\"$qemuga_statedir\"" >> $config_host_mak
>  echo "ARCH=$ARCH" >> $config_host_mak
>  if test "$debug_tcg" = "yes" ; then
>    echo "CONFIG_DEBUG_TCG=y" >> $config_host_mak
> 

Re: [Qemu-devel] [PATCH 0/3] qemu-ga: change default state dir to /var/run

[Paolo Bonzini]

Il 03/10/2012 19:24, Luiz Capitulino ha scritto:
> Also allow users to change the default at configure time. Please, check
> individual patches for more details.
> 
> Luiz Capitulino (3):
>   configure: guest_agent -> qemuga
>   configure: add --guest-agent-statedir
>   qemu-ga: use state dir from CONFIG_QEMUGA_STATEDIR
> 
>  configure | 16 +++++++++++-----
>  qemu-ga.c |  4 ++--
>  2 files changed, 13 insertions(+), 7 deletions(-)
> 

I have some comments on the autoconfyness of patch 2, otherwise looks good.

Paolo

Re: [Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Luiz Capitulino]

On Wed, 03 Oct 2012 20:32:21 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Il 03/10/2012 19:24, Luiz Capitulino ha scritto:
> > Defaults to /var/run.
> 
> Please add instead --localstatedir (defaulting to ${prefix}/var), and
> make the guest agent's directory /run inside that one.  Packagers
> already know to override --localstatedir=/var, in some cases macros even
> do it automatically.

Well, that was my first version but I discarded it for two reasons.

First, --localstatedir is a host-side setting but qemu-ga is not supposed to
run in the host. What if I want a different setting for guests?

Second, having /run appended to --localstatedir (or whatever we choose) may
have a bad effect if qemu is built with --localstatedir=, where qemu-ga's
state will be "/run" (good for Fedora, but might not be good for other
distros or other unixes).

I'm not strong about this though, it just was my reasoning while doing this.

Re: [Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Paolo Bonzini]

Il 03/10/2012 20:53, Luiz Capitulino ha scritto:
> On Wed, 03 Oct 2012 20:32:21 +0200
> Paolo Bonzini <pbonzini@redhat.com> wrote:
> 
>> Il 03/10/2012 19:24, Luiz Capitulino ha scritto:
>>> Defaults to /var/run.
>>
>> Please add instead --localstatedir (defaulting to ${prefix}/var), and
>> make the guest agent's directory /run inside that one.  Packagers
>> already know to override --localstatedir=/var, in some cases macros even
>> do it automatically.
> 
> Well, that was my first version but I discarded it for two reasons.
> 
> First, --localstatedir is a host-side setting but qemu-ga is not supposed to
> run in the host. What if I want a different setting for guests?

Then you should build twice, like you do when the guest is a completely
different OS.

> Second, having /run appended to --localstatedir (or whatever we choose) may
> have a bad effect if qemu is built with --localstatedir=, where qemu-ga's
> state will be "/run" (good for Fedora, but might not be good for other
> distros or other unixes).

I'm not sure I follow, it would be --localstatedir=/var usually.  Even
Fedora would not use --localstatedir=.

Paolo

> 
> I'm not strong about this though, it just was my reasoning while doing this.
> 
> 

Re: [Qemu-devel] [PATCH 2/3] configure: add --guest-agent-statedir

[Luiz Capitulino]

On Wed, 03 Oct 2012 20:56:31 +0200
Paolo Bonzini <pbonzini@redhat.com> wrote:

> Il 03/10/2012 20:53, Luiz Capitulino ha scritto:
> > On Wed, 03 Oct 2012 20:32:21 +0200
> > Paolo Bonzini <pbonzini@redhat.com> wrote:
> > 
> >> Il 03/10/2012 19:24, Luiz Capitulino ha scritto:
> >>> Defaults to /var/run.
> >>
> >> Please add instead --localstatedir (defaulting to ${prefix}/var), and
> >> make the guest agent's directory /run inside that one.  Packagers
> >> already know to override --localstatedir=/var, in some cases macros even
> >> do it automatically.
> > 
> > Well, that was my first version but I discarded it for two reasons.
> > 
> > First, --localstatedir is a host-side setting but qemu-ga is not supposed to
> > run in the host. What if I want a different setting for guests?
> 
> Then you should build twice, like you do when the guest is a completely
> different OS.

Fine with me if this is acceptable.

> > Second, having /run appended to --localstatedir (or whatever we choose) may
> > have a bad effect if qemu is built with --localstatedir=, where qemu-ga's
> > state will be "/run" (good for Fedora, but might not be good for other
> > distros or other unixes).
> 
> I'm not sure I follow, it would be --localstatedir=/var usually.  Even
> Fedora would not use --localstatedir=.

Which part you didn't follow, that no one would build with --localstatedir=
or what is the problem if this is done?

If it's the former, then I buy that argument and will change the series.