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Blame SOURCES/kvm-qga-determine-default-state-dir-and-pidfile-dynamica.patch

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From 211077f1cceb5f814d0750b183ff19995b37c6d3 Mon Sep 17 00:00:00 2001
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From: Laszlo Ersek <lersek@redhat.com>
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Date: Wed, 31 Jul 2013 14:03:23 +0200
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Subject: [PATCH 02/28] qga: determine default state dir and pidfile dynamically
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RH-Author: Laszlo Ersek <lersek@redhat.com>
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Message-id: <1375279407-13573-3-git-send-email-lersek@redhat.com>
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Patchwork-id: 52861
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O-Subject: [RHEL-7 qemu-kvm PATCH 2/6] qga: determine default state dir and pidfile dynamically
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Bugzilla: 964304
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RH-Acked-by: Michal Novotny <minovotn@redhat.com>
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RH-Acked-by: Luiz Capitulino <lcapitulino@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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No effective change on POSIX, but on Win32 the defaults come from the
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environment / session.
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Since commit 39097daf ("qemu-ga: use key-value store to avoid recycling fd
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handles after restart") we've relied on the state directory for the fd
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handles' key-value store. Even though we don't support the guest-file-*
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commands on win32 yet, the key-value store is written, and it's the first
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use of the state directory on win32. We should have a sensible default for
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its location.
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Signed-off-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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(cherry picked from commit c394ecb7bf55b7234f852b9c8518aefb5d0943fa)
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---
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 qga/main.c |   32 ++++++++++++++++++++++++++------
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 1 files changed, 26 insertions(+), 6 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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 qga/main.c |   32 ++++++++++++++++++++++++++------
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 1 files changed, 26 insertions(+), 6 deletions(-)
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diff --git a/qga/main.c b/qga/main.c
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index c2ba5d9..050b968 100644
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--- a/qga/main.c
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+++ b/qga/main.c
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@@ -45,16 +45,21 @@
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 #ifndef _WIN32
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 #define QGA_VIRTIO_PATH_DEFAULT "/dev/virtio-ports/org.qemu.guest_agent.0"
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+#define QGA_STATE_RELATIVE_DIR  "run"
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 #else
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 #define QGA_VIRTIO_PATH_DEFAULT "\\\\.\\Global\\org.qemu.guest_agent.0"
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+#define QGA_STATE_RELATIVE_DIR  "qemu-ga"
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 #endif
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-#define QGA_STATEDIR_DEFAULT CONFIG_QEMU_LOCALSTATEDIR "/run"
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-#define QGA_PIDFILE_DEFAULT QGA_STATEDIR_DEFAULT "/qemu-ga.pid"
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 #ifdef CONFIG_FSFREEZE
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 #define QGA_FSFREEZE_HOOK_DEFAULT CONFIG_QEMU_CONFDIR "/fsfreeze-hook"
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 #endif
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 #define QGA_SENTINEL_BYTE 0xFF
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+static struct {
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+    const char *state_dir;
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+    const char *pidfile;
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+} dfl_pathnames;
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+
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 typedef struct GAPersistentState {
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 #define QGA_PSTATE_DEFAULT_FD_COUNTER 1000
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     int64_t fd_counter;
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@@ -106,6 +111,17 @@ DWORD WINAPI service_ctrl_handler(DWORD ctrl, DWORD type, LPVOID data,
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 VOID WINAPI service_main(DWORD argc, TCHAR *argv[]);
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 #endif
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+static void
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+init_dfl_pathnames(void)
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+{
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+    g_assert(dfl_pathnames.state_dir == NULL);
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+    g_assert(dfl_pathnames.pidfile == NULL);
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+    dfl_pathnames.state_dir = qemu_get_local_state_pathname(
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+      QGA_STATE_RELATIVE_DIR);
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+    dfl_pathnames.pidfile   = qemu_get_local_state_pathname(
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+      QGA_STATE_RELATIVE_DIR G_DIR_SEPARATOR_S "qemu-ga.pid");
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+}
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+
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 static void quit_handler(int sig)
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 {
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     /* if we're frozen, don't exit unless we're absolutely forced to,
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@@ -198,11 +214,11 @@ static void usage(const char *cmd)
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 "  -h, --help        display this help and exit\n"
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 "\n"
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 "Report bugs to <mdroth@linux.vnet.ibm.com>\n"
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-    , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_PIDFILE_DEFAULT,
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+    , cmd, QEMU_VERSION, QGA_VIRTIO_PATH_DEFAULT, dfl_pathnames.pidfile,
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 #ifdef CONFIG_FSFREEZE
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     QGA_FSFREEZE_HOOK_DEFAULT,
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 #endif
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-    QGA_STATEDIR_DEFAULT);
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+    dfl_pathnames.state_dir);
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 }
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 static const char *ga_log_level_str(GLogLevelFlags level)
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@@ -908,11 +924,11 @@ int main(int argc, char **argv)
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     const char *sopt = "hVvdm:p:l:f:F::b:s:t:";
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     const char *method = NULL, *path = NULL;
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     const char *log_filepath = NULL;
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-    const char *pid_filepath = QGA_PIDFILE_DEFAULT;
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+    const char *pid_filepath;
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 #ifdef CONFIG_FSFREEZE
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     const char *fsfreeze_hook = NULL;
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 #endif
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-    const char *state_dir = QGA_STATEDIR_DEFAULT;
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+    const char *state_dir;
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 #ifdef _WIN32
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     const char *service = NULL;
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 #endif
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@@ -942,6 +958,10 @@ int main(int argc, char **argv)
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     module_call_init(MODULE_INIT_QAPI);
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+    init_dfl_pathnames();
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+    pid_filepath = dfl_pathnames.pidfile;
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+    state_dir = dfl_pathnames.state_dir;
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+
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     while ((ch = getopt_long(argc, argv, sopt, lopt, &opt_ind)) != -1) {
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         switch (ch) {
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         case 'm':
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-- 
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1.7.1
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