[libvirt] [PATCH] Add utility functions for storing uninstalled location

[Nehal J Wani]

When libvirtd is run from a build directory without being installed, it
should not depend on files from a libvirt package installed in the
system. Currently, APIs defined in src/ don't know whether libvirtd
is being run from the build dir or the installed dir. The following
additions provide the functionality to do so:

src/util/virutil.c
   *virSetUninstalledDir
   *virGetUninstalledDir

Example usage (utility = lxc|iohelper):
   char *path_tmp = virGetUninstalledDir();
   if (path_tmp)
      /* do stuff with ("%s/../../src/libvirt_<utility>", path_tmp) */
   else
      /* do stuff with (LIBEXECDIR "/libvirt_<utility>") */

---
 daemon/libvirtd.c        |    1 +
 src/libvirt_private.syms |    2 ++
 src/util/virutil.c       |   25 +++++++++++++++++++++++++
 src/util/virutil.h       |    3 +++
 4 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/daemon/libvirtd.c b/daemon/libvirtd.c
index 4179147..dc3da2a 100644
--- a/daemon/libvirtd.c
+++ b/daemon/libvirtd.c
@@ -1165,6 +1165,7 @@ int main(int argc, char **argv) {
             exit(EXIT_FAILURE);
         }
         *tmp = '\0';
+        virSetUninstalledDir(argv[0]);
         char *driverdir;
         if (virAsprintfQuiet(&driverdir, "%s/../../src/.libs", argv[0]) < 0 ||
             virAsprintfQuiet(&cpumap, "%s/../../src/cpu/cpu_map.xml",
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 5904036..a112e6e 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1989,6 +1989,7 @@ virGetGroupList;
 virGetGroupName;
 virGetHostname;
 virGetSelfLastChanged;
+virGetUninstalledDir;
 virGetUnprivSGIOSysfsPath;
 virGetUserCacheDirectory;
 virGetUserConfigDirectory;
@@ -2017,6 +2018,7 @@ virSetInherit;
 virSetNonBlock;
 virSetUIDGID;
 virSetUIDGIDWithCaps;
+virSetUninstalledDir;
 virStrIsPrint;
 virUpdateSelfLastChanged;
 virValidateWWN;
diff --git a/src/util/virutil.c b/src/util/virutil.c
index 733cdff..46f6c75 100644
--- a/src/util/virutil.c
+++ b/src/util/virutil.c
@@ -2204,3 +2204,28 @@ void virUpdateSelfLastChanged(const char *path)
         selfLastChanged = sb.st_ctime;
     }
 }
+
+static char *uninstalledDir = NULL;
+/**
+ * virSetUninstalledDir:
+ * @path: location from which libvirtd is running without
+ * installation
+ *
+ * Set a pointer to the path which can be accessed by all
+ * other APIs using virGetUninstalledDir().
+ */
+void virSetUninstalledDir(char *path)
+{
+    uninstalledDir = path;
+}
+
+/**
+ * virGetUninstalledDir:
+ *
+ * If libvirtd is running without installation, return the
+ * path from which it was invoked, otherwise, return NULL
+ */
+char *virGetUninstalledDir(void)
+{
+    return uninstalledDir;
+}
diff --git a/src/util/virutil.h b/src/util/virutil.h
index 1f2efd5..3e6ba47 100644
--- a/src/util/virutil.h
+++ b/src/util/virutil.h
@@ -202,4 +202,7 @@ bool virIsSUID(void);
 time_t virGetSelfLastChanged(void);
 void virUpdateSelfLastChanged(const char *path);
 
+void virSetUninstalledDir(char *path);
+char *virGetUninstalledDir(void);
+
 #endif /* __VIR_UTIL_H__ */
-- 
1.7.1