Ticket #3751: extfs: rpm: introduce the $RPM_QUERY_FMT variable.

This minor refactoring will enable us to make this helper testable.

Instead of doing:

    $RPM -qp --qf a b c

we are now doing:

    $RPM_QUERY_FMT a b c

In a future patch we'll then be able to point $RPM_QUERY_FMT to some mock
program.

Signed-off-by: Mooffie <mooffie@gmail.com>

src/vfs/extfs/helpers/rpm

@@ -64,6 +64,7 @@ if rpm --nosignature --version >/dev/null 2>&1; then
 else
   RPM="rpm"
 fi
+RPM_QUERY_FMT="$RPM -qp --qf"
 RPM2CPIO="rpm2cpio"
 
 SED="sed"
@@ -92,7 +93,7 @@ mcrpmfs_getAllNeededTags()
 	tag_CONFLICTS=""
     fi
 
-    $RPM -qp --qf \
+    $RPM_QUERY_FMT \
 "|NAME=%{NAME}"\
 "|VERSION=%{VERSION}"\
 "|RELEASE=%{RELEASE}"\
@@ -113,7 +114,7 @@ ${tag_CONFLICTS}\
 
 mcrpmfs_getRawOneTag()
 {
-    $RPM -qp --qf "$1" "${rpm_filename}"
+    $RPM_QUERY_FMT "$1" "${rpm_filename}"
 }
 
 mcrpmfs_getOneTag()