From 81e311e36abca2f433fa6ac3d86100fcc9d50403 Mon Sep 17 00:00:00 2001
From: Kyle Walker <kwalker@redhat.com>
Date: Thu, 15 Nov 2018 11:50:39 -0500
Subject: [PATCH] shared/install: allow "enable" on linked unit files

User expectations are broken when "systemctl enable /some/path/service.service"
behaves differently to "systemctl link ..." followed by "systemctl enable".
From user's POV, "enable" with the full path just combines the two steps into
one.

(cherry picked from commit f777b4345e8c57e739bda746f78757d0fb136ac7)

Resolves: #1628575
---
 src/shared/install.c         | 2 +-
 src/test/test-install-root.c | 7 ++++++-
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/shared/install.c b/src/shared/install.c
index e73f0c95bd..ea01e4dcc2 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -1878,7 +1878,7 @@ int unit_file_enable(
                 return r;
 
         STRV_FOREACH(f, files) {
-                r = install_info_discover(scope, &c, root_dir, &paths, *f, SEARCH_LOAD, &i);
+                r = install_info_discover(scope, &c, root_dir, &paths, *f, SEARCH_LOAD|SEARCH_FOLLOW_CONFIG_SYMLINKS, &i);
                 if (r < 0)
                         return r;
                 if (i->type == UNIT_FILE_TYPE_MASKED)
diff --git a/src/test/test-install-root.c b/src/test/test-install-root.c
index cb417d4c19..9f6fa625ac 100644
--- a/src/test/test-install-root.c
+++ b/src/test/test-install-root.c
@@ -299,7 +299,12 @@ static void test_linked_units(const char *root) {
         unit_file_changes_free(changes, n_changes);
         changes = NULL; n_changes = 0;
 
-        assert_se(unit_file_enable(UNIT_FILE_SYSTEM, 0, root, STRV_MAKE("linked3.service"), &changes, &n_changes) == -ELOOP);
+        assert_se(unit_file_enable(UNIT_FILE_SYSTEM, 0, root, STRV_MAKE("linked3.service"), &changes, &n_changes) >= 0);
+        assert_se(n_changes == 1);
+        assert_se(changes[0].type == UNIT_FILE_SYMLINK);
+        assert_se(startswith(changes[0].path, root));
+        assert_se(endswith(changes[0].path, "linked3.service"));
+        assert_se(streq(changes[0].source, "/opt/linked3.service"));
         unit_file_changes_free(changes, n_changes);
         changes = NULL; n_changes = 0;
 }