[libvirt] [PATCH] util: honor anchored names when searching for executables

Eric Blake eblake at redhat.com
Tue Jul 12 22:51:51 UTC 2011

I got bit in a debugging session on an uninstalled libvirtd; the
code tried to call out to the installed $LIBEXECDIR/libvirt_iohelper
instead of my just-built version.  So I set a breakpoint and altered
the binary name to be "./src/libvirt_iohelper", and it still failed
because I don't have "." on my PATH.

According to POSIX, execvp only searches PATH if the name does
not contain a slash.  Since we are trying to mimic that behavior,
an anchored name should be relative to the current working dir.

* src/util/util.c (virFindFileInPath): Anchored relative names do
not invoke a PATH search.
 src/util/util.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/src/util/util.c b/src/util/util.c
index 1441c51..20ccfa7 100644
--- a/src/util/util.c
+++ b/src/util/util.c
@@ -596,6 +596,14 @@ char *virFindFileInPath(const char *file)
             return NULL;

+    /* If we are passed an anchored path (containing a /), then there
+     * is no path search - it must exist in the current directory
+     */
+    if (strchr(file, '/')) {
+        virFileAbsPath(file, &path);
+        return path;
+    }
     /* copy PATH env so we can tweak it */
     path = getenv("PATH");


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