From 3cb3b0145ed8439eb604b43596e6456ed3292c46 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= Date: Sun, 21 Aug 2016 09:10:51 -0400 Subject: [PATCH] shared/install: do not enable masked instances (#4005) MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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; }