configure: Check that provided paths are absolute

configure checks that its built-in directory options get an absolute
path. Copy the check for custom options.

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Link: https://lore.kernel.org/r/8aff0c9c491d8afeec7f6b2cd96cbd0439e26fbb.1699618135.git.msuchanek@suse.de
Signed-off-by: Lucas De Marchi <lucas.de.marchi@gmail.com>

diff --git a/configure.ac b/configure.ac
index d6da5ee9ae9ae2b624c4c29b4125d6966bb773eb..de01e08cf2e89c4d9949cbe9e1804e941b30a9bb 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -97,6 +97,23 @@ AC_ARG_WITH([module_directory],
         [], [with_module_directory=/lib/modules])
 AC_SUBST([module_directory], [$with_module_directory])
 
+# Check all directory arguments for consistency.
+for ac_var in  distconfdir rootlibdir module_directory
+do
+  eval ac_val=\$$ac_var
+  # Remove trailing slashes.
+  case $ac_val in
+    */ )
+      ac_val=`expr "X$ac_val" : 'X\(.*@<:@^/@:>@\)' \| "X$ac_val" : 'X\(.*\)'`
+      eval $ac_var=\$ac_val;;
+  esac
+  # Be sure to have absolute directory names.
+  case $ac_val in
+    @<:@\\/$@:>@* | ?:@<:@\\/@:>@* )  continue;;
+  esac
+  as_fn_error $? "expected an absolute directory name for --$ac_var: $ac_val"
+done
+
 AC_ARG_WITH([zstd],
        AS_HELP_STRING([--with-zstd], [handle Zstandard-compressed modules @<:@default=disabled@:>@]),
        [], [with_zstd=no])