unit: introduce %f specifier to decode file names

3 files changed, 36 insertions, 0 deletions

diff --git a/src/unit-name.c b/src/unit-name.c
index dbaa4a7b12..d0cfca6254 100644
--- a/src/unit-name.c
+++ b/src/unit-name.c
@@ -427,3 +427,26 @@ char *unit_name_to_path(const char *name) {
 
         return e;
 }
+
+char *unit_name_path_unescape(const char *f) {
+        char *e;
+
+        assert(f);
+
+        if (!(e = unit_name_unescape(f)))
+                return NULL;
+
+        if (e[0] != '/') {
+                char *w;
+
+                w = strappend("/", e);
+                free(e);
+
+                if (!w)
+                        return NULL;
+
+                e = w;
+        }
+
+        return e;
+}
diff --git a/src/unit-name.h b/src/unit-name.h
index 9842db3552..e369910aea 100644
--- a/src/unit-name.h
+++ b/src/unit-name.h
@@ -42,6 +42,8 @@ char *unit_name_build_escape(const char *prefix, const char *instance, const cha
 char *unit_name_escape(const char *f);
 char *unit_name_unescape(const char *f);
 
+char *unit_name_path_unescape(const char *f);
+
 bool unit_name_is_template(const char *n);
 
 char *unit_name_replace_instance(const char *f, const char *i);
diff --git a/src/unit.c b/src/unit.c
index 07978134de..ab6eb20227 100644
--- a/src/unit.c
+++ b/src/unit.c
@@ -1880,6 +1880,16 @@ static char *specifier_instance_unescaped(char specifier, void *data, void *user
         return strdup("");
 }
 
+static char *specifier_filename(char specifier, void *data, void *userdata) {
+        Unit *u = userdata;
+        assert(u);
+
+        if (u->meta.instance)
+                return unit_name_path_unescape(u->meta.instance);
+
+        return unit_name_to_path(u->meta.instance);
+}
+
 char *unit_name_printf(Unit *u, const char* format) {
 
         /*
@@ -1918,6 +1928,7 @@ char *unit_full_printf(Unit *u, const char *format) {
                 { 'P', specifier_prefix_unescaped,    NULL },
                 { 'i', specifier_string,              u->meta.instance },
                 { 'I', specifier_instance_unescaped,  NULL },
+                { 'f', specifier_filename,            NULL },
                 { 0, NULL, NULL }
         };