install: add root directory to LookupPaths structure

We use the root directory parameter while putting together the LookupPaths
structure, hence let's also store it in the structure as-is. That way we can
drop a parameter from half of the functions in install.c

Also, let's move the validation of the root paths into lookup_paths_init() so
that we can drop even more code from install.c

1 files changed, 3 insertions, 0 deletions

diff --git a/src/shared/path-lookup.h b/src/shared/path-lookup.h
index 974db79509..078c3484f5 100644
--- a/src/shared/path-lookup.h
+++ b/src/shared/path-lookup.h
@@ -37,6 +37,9 @@ struct LookupPaths {
         char *generator;
         char *generator_early;
         char *generator_late;
+
+        /* The root directory prepended to all items above, or NULL */
+        char *root_dir;
 };
 
 int user_config_home(char **config_home);