From 3cb3b0145ed8439eb604b43596e6456ed3292c46 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Sun, 21 Aug 2016 09:10:51 -0400
Subject: [PATCH] shared/install: do not enable masked instances (#4005)
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When told to enable a template unit, and the DefaultInstance specified in that
unit was masked, we would do this. Such a unit cannot be started or loaded, so
reporting successful enabling is misleading and unexpected.
$ systemctl mask getty@tty1
Created symlink /etc/systemd/system/getty@tty1.service → /dev/null.
$ systemctl --root=/ enable getty@tty1
(unchanged)
Failed to enable unit, unit /etc/systemd/system/getty@tty1.service is masked.
$ systemctl --root=/ enable getty@
(before)
Created symlink /etc/systemd/system/getty.target.wants/getty@tty1.service → /usr/lib/systemd/system/getty@.service.
(now)
Failed to enable unit, unit /etc/systemd/system/getty@tty1.service is masked.
The same error is emitted for enable and preset. And an error is emmited, not a
warning, so the failure to enable DefaultInstance is treated the same as if the
instance was specified on the command line. I think that this makes most sense,
for most template units.
Fixes #2513.
(cherry picked from commit 047d91f9c8cf1bcf5a30f428668babd619533944)
---
src/shared/install.c | 35 ++++++++++++++++++++++++++++-------
1 file changed, 28 insertions(+), 7 deletions(-)
diff --git a/src/shared/install.c b/src/shared/install.c
index 9d9f4dff4f..cb2a2e7e0d 100644
--- a/src/shared/install.c
+++ b/src/shared/install.c
@@ -912,8 +912,8 @@ static int install_info_may_process(
assert(i);
assert(paths);
- /* Checks whether the loaded unit file is one we should process, or is masked, transient or generated and thus
- * not subject to enable/disable operations. */
+ /* Checks whether the loaded unit file is one we should process, or is masked,
+ * transient or generated and thus not subject to enable/disable operations. */
if (i->type == UNIT_FILE_TYPE_MASKED) {
unit_file_changes_add(changes, n_changes, -ERFKILL, i->path, NULL);
@@ -1134,7 +1134,6 @@ static int unit_file_load(
struct stat st;
int r;
- assert(c);
assert(info);
assert(path);
@@ -1163,6 +1162,9 @@ static int unit_file_load(
return 0;
}
+ /* c is only needed if we actually load the file */
+ assert(c);
+
fd = open(path, O_RDONLY|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW);
if (fd < 0)
return -errno;
@@ -1275,7 +1277,6 @@ static int unit_file_search(
char **p;
int r;
- assert(c);
assert(info);
assert(paths);
@@ -1546,7 +1547,14 @@ static int install_info_symlink_wants(
assert(paths);
assert(config_path);
+ if (strv_isempty(list))
+ return 0;
+
if (unit_name_is_valid(i->name, UNIT_NAME_TEMPLATE)) {
+ UnitFileInstallInfo instance = {
+ .type = _UNIT_FILE_TYPE_INVALID,
+ };
+ _cleanup_free_ char *path = NULL;
/* Don't install any symlink if there's no default
* instance configured */
@@ -1558,6 +1566,19 @@ static int install_info_symlink_wants(
if (r < 0)
return r;
+ instance.name = buf;
+ r = unit_file_search(NULL, &instance, paths, SEARCH_FOLLOW_CONFIG_SYMLINKS);
+ if (r < 0)
+ return r;
+
+ path = instance.path;
+ instance.path = NULL;
+
+ if (instance.type == UNIT_FILE_TYPE_MASKED) {
+ unit_file_changes_add(changes, n_changes, -ERFKILL, path, NULL);
+ return -ERFKILL;
+ }
+
n = buf;
} else
n = i->name;
@@ -1687,12 +1708,12 @@ static int install_context_apply(
return r;
/* We can attempt to process a masked unit when a different unit
- * that we were processing specifies it in DefaultInstance= or Also=. */
+ * that we were processing specifies it in Also=. */
if (i->type == UNIT_FILE_TYPE_MASKED) {
unit_file_changes_add(changes, n_changes, UNIT_FILE_IS_MASKED, i->path, NULL);
if (r >= 0)
- /* Assume that some *could* have been enabled here, avoid
- * "empty [Install] section" warning. */
+ /* Assume that something *could* have been enabled here,
+ * avoid "empty [Install] section" warning. */
r += 1;
continue;
}