tree-wide: make specifier expansion --root= aware

This fixes repart's, systemctl's, sysusers' and tmpfiles' specifier
expansion to honour the root dir specified with --root=. This is
relevant for specifiers such as %m, %o, … which are directly sourced
from files on disk.

This doesn't try to be overly smart: specifiers referring to runtime
concepts (i.e. boot ID, architecture, hostname) rather than files on the
medium are left as is. There's certainly a point to be made that they
should fail in case --root= is specified, but I am not entirely convinced
about that, and it's certainly something we can look into later if
there's reason to.

I wondered for a while how to hook this up best, but given that quite a
large number of specifiers resolve to data from files on disks, and most
of our tools needs this, I ultimately decided to make the root dir a
first class parameter to specifier_printf().

Replaces: #16187
Fixes: #16183

1 files changed, 23 insertions, 23 deletions

diff --git a/src/shared/specifier.h b/src/shared/specifier.h
index 839515da42..c433ee2d63 100644
--- a/src/shared/specifier.h
+++ b/src/shared/specifier.h
@@ -3,7 +3,7 @@
 
 #include "string-util.h"
 
-typedef int (*SpecifierCallback)(char specifier, const void *data, const void *userdata, char **ret);
+typedef int (*SpecifierCallback)(char specifier, const void *data, const char *root, const void *userdata, char **ret);
 
 typedef struct Specifier {
         const char specifier;
@@ -11,32 +11,32 @@ typedef struct Specifier {
         const void *data;
 } Specifier;
 
-int specifier_printf(const char *text, size_t max_length, const Specifier table[], const void *userdata, char **ret);
+int specifier_printf(const char *text, size_t max_length, const Specifier table[], const char *root, const void *userdata, char **ret);
 
-int specifier_string(char specifier, const void *data, const void *userdata, char **ret);
+int specifier_string(char specifier, const void *data, const char *root, const void *userdata, char **ret);
 
-int specifier_machine_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_boot_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_host_name(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_short_host_name(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_kernel_release(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_architecture(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_os_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_os_version_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_os_build_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_os_variant_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_os_image_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_os_image_version(char specifier, const void *data, const void *userdata, char **ret);
+int specifier_machine_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_boot_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_host_name(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_short_host_name(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_kernel_release(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_architecture(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_os_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_os_version_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_os_build_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_os_variant_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_os_image_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_os_image_version(char specifier, const void *data, const char *root, const void *userdata, char **ret);
 
-int specifier_group_name(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_group_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_user_name(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_user_id(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_user_home(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_user_shell(char specifier, const void *data, const void *userdata, char **ret);
+int specifier_group_name(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_group_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_user_name(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_user_id(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_user_home(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_user_shell(char specifier, const void *data, const char *root, const void *userdata, char **ret);
 
-int specifier_tmp_dir(char specifier, const void *data, const void *userdata, char **ret);
-int specifier_var_tmp_dir(char specifier, const void *data, const void *userdata, char **ret);
+int specifier_tmp_dir(char specifier, const void *data, const char *root, const void *userdata, char **ret);
+int specifier_var_tmp_dir(char specifier, const void *data, const char *root, const void *userdata, char **ret);
 
 /* Typically, in places where one of the above specifier is to be resolved the other similar ones are to be
  * resolved, too. Hence let's define common macros for the relevant array entries.