4 files changed, 62 insertions, 5 deletions

diff --git a/src/shared/cgroup-util.c b/src/shared/cgroup-util.c
index 7af0c3c124..4f58affe38 100644
--- a/src/shared/cgroup-util.c
+++ b/src/shared/cgroup-util.c
@@ -1617,3 +1617,53 @@ bool cg_controller_is_valid(const char *p, bool allow_named) {
 
         return true;
 }
+
+int cg_slice_to_path(const char *unit, char **ret) {
+        _cleanup_free_ char *p = NULL, *s = NULL, *e = NULL;
+        const char *dash;
+
+        assert(unit);
+        assert(ret);
+
+        if (!unit_name_is_valid(unit, false))
+                return -EINVAL;
+
+        if (!endswith(unit, ".slice"))
+                return -EINVAL;
+
+        p = unit_name_to_prefix(unit);
+        if (!p)
+                return -ENOMEM;
+
+        dash = strchr(p, '-');
+        while (dash) {
+                _cleanup_free_ char *escaped = NULL;
+                char n[dash - p + sizeof(".slice")];
+
+                strcpy(stpncpy(n, p, dash - p), ".slice");
+
+                if (!unit_name_is_valid(n, false))
+                        return -EINVAL;
+
+                escaped = cg_escape(n);
+                if (!escaped)
+                        return -ENOMEM;
+
+                if (!strextend(&s, escaped, "/", NULL))
+                        return -ENOMEM;
+
+                dash = strchr(dash+1, '-');
+        }
+
+        e = cg_escape(unit);
+        if (!e)
+                return -ENOMEM;
+
+        if (!strextend(&s, e, NULL))
+                return -ENOMEM;
+
+        *ret = s;
+        s = NULL;
+
+        return 0;
+}
diff --git a/src/shared/cgroup-util.h b/src/shared/cgroup-util.h
index 5835e04075..84274e605d 100644
--- a/src/shared/cgroup-util.h
+++ b/src/shared/cgroup-util.h
@@ -112,3 +112,5 @@ char *cg_escape(const char *p);
 char *cg_unescape(const char *p) _pure_;
 
 bool cg_controller_is_valid(const char *p, bool allow_named);
+
+int cg_slice_to_path(const char *unit, char **ret);
diff --git a/src/shared/unit-name.c b/src/shared/unit-name.c
index a809713595..2d4cd8d9f3 100644
--- a/src/shared/unit-name.c
+++ b/src/shared/unit-name.c
@@ -44,6 +44,7 @@ static const char* const unit_type_table[_UNIT_TYPE_MAX] = {
         [UNIT_TIMER] = "timer",
         [UNIT_SWAP] = "swap",
         [UNIT_PATH] = "path",
+        [UNIT_SLICE] = "slice"
 };
 
 DEFINE_STRING_TABLE_LOOKUP(unit_type, UnitType);
@@ -184,6 +185,7 @@ char *unit_name_change_suffix(const char *n, const char *suffix) {
         assert(n);
         assert(unit_name_is_valid(n, true));
         assert(suffix);
+        assert(suffix[0] == '.');
 
         assert_se(e = strrchr(n, '.'));
         a = e - n;
@@ -506,16 +508,18 @@ char *unit_name_mangle(const char *name) {
         return r;
 }
 
-char *snapshot_name_mangle(const char *name) {
+char *unit_name_mangle_with_suffix(const char *name, const char *suffix) {
         char *r, *t;
         const char *f;
 
         assert(name);
+        assert(suffix);
+        assert(suffix[0] == '.');
 
         /* Similar to unit_name_mangle(), but is called when we know
          * that this is about snapshot units. */
 
-        r = new(char, strlen(name) * 4 + 1 + sizeof(".snapshot")-1);
+        r = new(char, strlen(name) * 4 + strlen(suffix) + 1);
         if (!r)
                 return NULL;
 
@@ -528,8 +532,8 @@ char *snapshot_name_mangle(const char *name) {
                         *(t++) = *f;
         }
 
-        if (!endswith(name, ".snapshot"))
-                strcpy(t, ".snapshot");
+        if (!endswith(name, suffix))
+                strcpy(t, suffix);
         else
                 *t = 0;
 
diff --git a/src/shared/unit-name.h b/src/shared/unit-name.h
index 9eca8eb3c1..baa487a81d 100644
--- a/src/shared/unit-name.h
+++ b/src/shared/unit-name.h
@@ -41,6 +41,7 @@ enum UnitType {
         UNIT_TIMER,
         UNIT_SWAP,
         UNIT_PATH,
+        UNIT_SLICE,
         _UNIT_TYPE_MAX,
         _UNIT_TYPE_INVALID = -1
 };
@@ -94,4 +95,4 @@ char *unit_name_to_path(const char *name);
 char *unit_dbus_path_from_name(const char *name);
 
 char *unit_name_mangle(const char *name);
-char *snapshot_name_mangle(const char *name);
+char *unit_name_mangle_with_suffix(const char *name, const char *suffix);