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From c9a4b1688552a23867d3d9db18620501d57d33da Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
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Date: Sat, 16 Apr 2016 19:31:53 -0400
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Subject: [PATCH] systemctl/core: ignore masked units in preset-all
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With any masked unit that would that would be enabled by presets, we'd get:
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test@rawhide $ sudo systemctl preset-all
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Failed to execute operation: Unit file is masked.
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test@rawhide $ sudo systemctl --root=/ preset-all
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Operation failed: Cannot send after transport endpoint shutdown
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Simply ignore those units:
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test@rawhide $ sudo systemctl preset-all
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Unit xxx.service is masked, ignoring.
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Cherry-picked from: 9a0a413a195a21888cf926be5595d0efc1eef0fe
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Related: #1375097
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---
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 src/core/dbus-manager.c          | 12 +++++++-----
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 src/libsystemd/sd-bus/bus-util.c | 10 ++++++++--
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 src/shared/install.c             |  4 ++++
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 src/shared/install.h             |  5 +++++
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 src/systemctl/systemctl.c        | 20 ++++++++++++++------
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 5 files changed, 38 insertions(+), 13 deletions(-)
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diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
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index 8d3758ac7..c2067c099 100644
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--- a/src/core/dbus-manager.c
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+++ b/src/core/dbus-manager.c
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@@ -1598,11 +1598,13 @@ static int reply_unit_file_changes_and_free(
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         unsigned i;
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         int r;
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-        if (n_changes > 0) {
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-                r = bus_foreach_bus(m, NULL, send_unit_files_changed, NULL);
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-                if (r < 0)
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-                        log_debug_errno(r, "Failed to send UnitFilesChanged signal: %m");
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-        }
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+        for (i = 0; i < n_changes; i++)
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+                if (unit_file_change_is_modification(changes[i].type)) {
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+                        r = bus_foreach_bus(m, NULL, send_unit_files_changed, NULL);
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+                        if (r < 0)
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+                                log_debug_errno(r, "Failed to send UnitFilesChanged signal: %m");
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+                        break;
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+                }
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         r = sd_bus_message_new_method_return(message, &reply);
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         if (r < 0)
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diff --git a/src/libsystemd/sd-bus/bus-util.c b/src/libsystemd/sd-bus/bus-util.c
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index 9d70798cd..75d03708e 100644
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--- a/src/libsystemd/sd-bus/bus-util.c
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+++ b/src/libsystemd/sd-bus/bus-util.c
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@@ -1893,11 +1893,17 @@ int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, Un
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                 if (!quiet) {
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                         if (streq(type, "symlink"))
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                                 log_info("Created symlink from %s to %s.", path, source);
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-                        else
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+                        else if (streq(type, "unlink"))
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                                 log_info("Removed symlink %s.", path);
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+                        else if (streq(type, "masked"))
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+                                log_info("Unit %s is masked, ignoring.", path);
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+                        else
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+                                log_notice("Manager reported unknown change type \"%s\" for %s.", type, path);
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                 }
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-                r = unit_file_changes_add(changes, n_changes, streq(type, "symlink") ? UNIT_FILE_SYMLINK : UNIT_FILE_UNLINK, path, source);
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+                r = unit_file_changes_add(changes, n_changes,
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+                                          unit_file_change_type_from_string(type),
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+                                          path, source);
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                 if (r < 0)
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                         return r;
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         }
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diff --git a/src/shared/install.c b/src/shared/install.c
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index ab86cd145..62da52d3b 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -2402,6 +2402,9 @@ int unit_file_preset_all(
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                                 continue;
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                         r = preset_prepare_one(scope, &plus, &minus, &paths, root_dir, mode, de->d_name);
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+                        if (r == -ESHUTDOWN)
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+                                r = unit_file_changes_add(changes, n_changes,
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+                                                          UNIT_FILE_IS_MASKED, de->d_name, NULL);
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                         if (r < 0)
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                                 return r;
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                 }
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@@ -2535,6 +2538,7 @@ DEFINE_STRING_TABLE_LOOKUP(unit_file_state, UnitFileState);
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 static const char* const unit_file_change_type_table[_UNIT_FILE_CHANGE_TYPE_MAX] = {
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         [UNIT_FILE_SYMLINK] = "symlink",
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         [UNIT_FILE_UNLINK] = "unlink",
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+        [UNIT_FILE_IS_MASKED] = "masked",
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 };
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 DEFINE_STRING_TABLE_LOOKUP(unit_file_change_type, UnitFileChangeType);
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diff --git a/src/shared/install.h b/src/shared/install.h
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index 87a40b67c..f0e36661b 100644
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--- a/src/shared/install.h
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+++ b/src/shared/install.h
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@@ -60,10 +60,15 @@ typedef enum UnitFilePresetMode {
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 typedef enum UnitFileChangeType {
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         UNIT_FILE_SYMLINK,
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         UNIT_FILE_UNLINK,
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+        UNIT_FILE_IS_MASKED,
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         _UNIT_FILE_CHANGE_TYPE_MAX,
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         _UNIT_FILE_CHANGE_TYPE_INVALID = -1
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 } UnitFileChangeType;
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+static inline bool unit_file_change_is_modification(UnitFileChangeType type) {
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+        return IN_SET(type, UNIT_FILE_SYMLINK, UNIT_FILE_UNLINK);
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+}
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+
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 typedef struct UnitFileChange {
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         UnitFileChangeType type;
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         char *path;
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diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
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index e4b404abc..a688d6905 100644
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--- a/src/systemctl/systemctl.c
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+++ b/src/systemctl/systemctl.c
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@@ -1944,12 +1944,20 @@ static void dump_unit_file_changes(const UnitFileChange *changes, unsigned n_cha
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         assert(changes || n_changes == 0);
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-        for (i = 0; i < n_changes; i++) {
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-                if (changes[i].type == UNIT_FILE_SYMLINK)
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-                        log_info("Created symlink from %s to %s.", changes[i].path, changes[i].source);
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-                else
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-                        log_info("Removed symlink %s.", changes[i].path);
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-        }
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+        for (i = 0; i < n_changes; i++)
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+                switch(changes[i].type) {
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+                case UNIT_FILE_SYMLINK:
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+                        log_info("Created symlink %s, pointing to %s.", changes[i].path, changes[i].source);
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+                        break;
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+                case UNIT_FILE_UNLINK:
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+                        log_info("Removed %s.", changes[i].path);
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+                        break;
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+                case UNIT_FILE_IS_MASKED:
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+                        log_info("Unit %s is masked, ignoring.", changes[i].path);
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+                        break;
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+                default:
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+                        assert_not_reached("bad change type");
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+                }
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 }
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 static int set_default(sd_bus *bus, char **args) {