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Blame SOURCES/0444-shared-systemctl-teach-is-enabled-to-show-installati.patch

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From fef4e6a045ae703de12ec271b0c8fd02d0bac0fc Mon Sep 17 00:00:00 2001
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From: Jan Synacek <jsynacek@redhat.com>
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Date: Thu, 20 Oct 2016 15:20:11 +0200
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Subject: [PATCH] shared, systemctl: teach is-enabled to show installation
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 targets
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It may be desired by users to know what targets a particular service is
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installed into. Improve user friendliness by teaching the is-enabled
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command to show such information when used with --full.
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This patch makes use of the newly added UnitFileFlags and adds
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UNIT_FILE_DRY_RUN flag into it. Since the API had already been modified,
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it's now easy to add the new dry-run feature for other commands as
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well. As a next step, --dry-run could be added to systemctl, which in
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turn might pave the way for a long requested dry-run feature when
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running systemctl start.
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(cherry picked from commit 3b3557c410c7910fae0990599dcb82711cf5fbb7)
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Resolves: #1413041
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---
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 man/systemctl.xml                      |  3 ++
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 src/core/dbus-manager.c                | 44 ++++++++++++++++
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 src/core/org.freedesktop.systemd1.conf |  4 ++
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 src/shared/install.c                   | 35 +++++++-----
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 src/shared/install.h                   |  3 +-
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 src/systemctl/systemctl.c              | 73 +++++++++++++++++++++++++-
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 6 files changed, 145 insertions(+), 17 deletions(-)
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diff --git a/man/systemctl.xml b/man/systemctl.xml
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index bb21f3a887..4a1aff2273 100644
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--- a/man/systemctl.xml
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+++ b/man/systemctl.xml
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@@ -223,6 +223,8 @@
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           of <command>status</command>, <command>list-units</command>,
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           <command>list-jobs</command>, and
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           <command>list-timers</command>.</para>
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+          <para>Also, show installation targets in the output of
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+          <command>is-enabled</command>.</para>
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         </listitem>
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       </varlistentry>
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@@ -1054,6 +1056,7 @@ kobject-uevent 1 systemd-udevd-kernel.socket systemd-udevd.service
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             exit code of 0 if at least one is enabled, non-zero
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             otherwise. Prints the current enable status (see table).
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             To suppress this output, use <option>--quiet</option>.
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+            To show installation targets, use <option>--full</option>.
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             </para>
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diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
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index 5b40aa20f0..7ba1b519ea 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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@@ -1958,6 +1958,49 @@ static int method_add_dependency_unit_files(sd_bus *bus, sd_bus_message *message
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         return reply_unit_file_changes_and_free(m, bus, message, -1, changes, n_changes);
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 }
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+static int method_get_unit_file_links(sd_bus *bus, sd_bus_message *message, void *userdata, sd_bus_error *error) {
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+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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+        UnitFileChange *changes = NULL;
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+        unsigned n_changes = 0, i;
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+        UnitFileFlags flags;
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+        const char *name;
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+        char **p;
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+        int runtime, r;
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+
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+        r = sd_bus_message_read(message, "sb", &name, &runtime);
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+        if (r < 0)
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+                return r;
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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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+                return r;
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+
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+        r = sd_bus_message_open_container(reply, SD_BUS_TYPE_ARRAY, "s");
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+        if (r < 0)
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+                return r;
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+
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+        p = STRV_MAKE(name);
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+        flags = UNIT_FILE_DRY_RUN |
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+                (runtime ? UNIT_FILE_RUNTIME : 0);
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+
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+        r = unit_file_disable(UNIT_FILE_SYSTEM, flags, NULL, p, &changes, &n_changes);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to get file links for %s: %m", name);
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+
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+        for (i = 0; i < n_changes; i++)
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+                if (changes[i].type == UNIT_FILE_UNLINK) {
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+                        r = sd_bus_message_append(reply, "s", changes[i].path);
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+                        if (r < 0)
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+                                return r;
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+                }
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+
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+        r = sd_bus_message_close_container(reply);
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+        if (r < 0)
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+                return r;
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+
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+        return sd_bus_send(bus, reply, NULL);
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+}
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+
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 const sd_bus_vtable bus_manager_vtable[] = {
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         SD_BUS_VTABLE_START(0),
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@@ -2049,6 +2092,7 @@ const sd_bus_vtable bus_manager_vtable[] = {
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         SD_BUS_METHOD("GetDefaultTarget", NULL, "s", method_get_default_target, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("PresetAllUnitFiles", "sbb", "a(sss)", method_preset_all_unit_files, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_METHOD("AddDependencyUnitFiles", "asssbb", "a(sss)", method_add_dependency_unit_files, SD_BUS_VTABLE_UNPRIVILEGED),
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+        SD_BUS_METHOD("GetUnitFileLinks", "sb", "as", method_get_unit_file_links, SD_BUS_VTABLE_UNPRIVILEGED),
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         SD_BUS_SIGNAL("UnitNew", "so", 0),
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         SD_BUS_SIGNAL("UnitRemoved", "so", 0),
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diff --git a/src/core/org.freedesktop.systemd1.conf b/src/core/org.freedesktop.systemd1.conf
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index 6a7a37ee92..3997dd0b4e 100644
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--- a/src/core/org.freedesktop.systemd1.conf
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+++ b/src/core/org.freedesktop.systemd1.conf
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@@ -76,6 +76,10 @@
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                        send_interface="org.freedesktop.systemd1.Manager"
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                        send_member="GetUnitFileState"/>
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+                
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+                       send_interface="org.freedesktop.systemd1.Manager"
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+                       send_member="GetUnitFileLinks"/>
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+
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                        send_interface="org.freedesktop.systemd1.Manager"
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                        send_member="ListJobs"/>
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diff --git a/src/shared/install.c b/src/shared/install.c
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index b3df6b35c9..bdfd7b96a2 100644
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--- a/src/shared/install.c
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+++ b/src/shared/install.c
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@@ -340,6 +340,7 @@ static int remove_marked_symlinks_fd(
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                 int fd,
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                 const char *path,
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                 const char *config_path,
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+                bool dry_run,
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                 bool *restart,
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                 UnitFileChange **changes,
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                 unsigned *n_changes) {
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@@ -400,7 +401,7 @@ static int remove_marked_symlinks_fd(
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                         }
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                         /* This will close nfd, regardless whether it succeeds or not */
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-                        q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, restart, changes, n_changes);
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+                        q = remove_marked_symlinks_fd(remove_symlinks_to, nfd, p, config_path, dry_run, restart, changes, n_changes);
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                         if (q < 0 && r == 0)
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                                 r = q;
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@@ -439,21 +440,23 @@ static int remove_marked_symlinks_fd(
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                         if (!found)
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                                 continue;
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-                        if (unlink(p) < 0 && errno != ENOENT) {
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-                                if (r == 0)
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-                                        r = -errno;
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-                                continue;
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-                        }
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+                        if (!dry_run) {
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+                                if (unlink(p) < 0 && errno != ENOENT) {
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+                                        if (r == 0)
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+                                                r = -errno;
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+                                        continue;
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+                                }
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-                        path_kill_slashes(p);
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-                        (void) rmdir_parents(p, config_path);
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+                                path_kill_slashes(p);
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+                                (void) rmdir_parents(p, config_path);
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+                        }
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                         unit_file_changes_add(changes, n_changes, UNIT_FILE_UNLINK, p, NULL);
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                         q = mark_symlink_for_removal(&remove_symlinks_to, p);
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                         if (q < 0)
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                                 return q;
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-                        if (q > 0)
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+                        if (q > 0 && !dry_run)
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                                 *restart = true;
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                 }
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         }
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@@ -464,6 +467,7 @@ static int remove_marked_symlinks_fd(
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 static int remove_marked_symlinks(
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                 Set *remove_symlinks_to,
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                 const char *config_path,
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+                bool dry_run,
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                 UnitFileChange **changes,
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                 unsigned *n_changes) {
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@@ -491,7 +495,7 @@ static int remove_marked_symlinks(
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                 }
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                 /* This takes possession of cfd and closes it */
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-                q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, &restart, changes, n_changes);
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+                q = remove_marked_symlinks_fd(remove_symlinks_to, cfd, config_path, config_path, dry_run, &restart, changes, n_changes);
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                 if (r == 0)
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                         r = q;
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         } while (restart);
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@@ -1604,6 +1608,7 @@ int unit_file_unmask(
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         _cleanup_strv_free_ char **todo = NULL;
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         size_t n_todo = 0, n_allocated = 0;
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         char **i;
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+        bool dry_run;
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         int r, q;
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         assert(scope >= 0);
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@@ -1617,6 +1622,8 @@ int unit_file_unmask(
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         if (r < 0)
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                 return r;
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+        dry_run = !!(flags & UNIT_FILE_DRY_RUN);
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+
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         STRV_FOREACH(i, files) {
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                 _cleanup_free_ char *path = NULL;
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@@ -1655,7 +1662,7 @@ int unit_file_unmask(
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                 if (!path)
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                         return -ENOMEM;
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-                if (unlink(path) < 0) {
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+                if (!dry_run && unlink(path) < 0) {
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                         if (errno != -ENOENT && r >= 0)
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                                 r = -errno;
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                 } else {
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@@ -1667,7 +1674,7 @@ int unit_file_unmask(
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                 }
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         }
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-        q = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
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+        q = remove_marked_symlinks(remove_symlinks_to, config_path, dry_run, changes, n_changes);
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         if (r >= 0)
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                 r = q;
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@@ -1931,7 +1938,7 @@ int unit_file_disable(
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         if (r < 0)
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                 return r;
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-        return remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
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+        return remove_marked_symlinks(remove_symlinks_to, config_path, !!(flags & UNIT_FILE_DRY_RUN), changes, n_changes);
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 }
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 int unit_file_reenable(
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@@ -2243,7 +2250,7 @@ static int execute_preset(
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                 if (r < 0)
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                         return r;
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-                r = remove_marked_symlinks(remove_symlinks_to, config_path, changes, n_changes);
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+                r = remove_marked_symlinks(remove_symlinks_to, config_path, false, changes, n_changes);
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         } else
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                 r = 0;
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diff --git a/src/shared/install.h b/src/shared/install.h
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index c961b53d08..c236dcfd8e 100644
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--- a/src/shared/install.h
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+++ b/src/shared/install.h
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@@ -68,7 +68,8 @@ typedef enum UnitFileChangeType {
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 typedef enum UnitFileFlags {
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         UNIT_FILE_RUNTIME = 1,
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-        UNIT_FILE_FORCE = 1 << 1
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+        UNIT_FILE_FORCE = 1 << 1,
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+        UNIT_FILE_DRY_RUN = 1 << 2
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 } UnitFileFlags;
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 static inline bool unit_file_change_is_modification(UnitFileChangeType type) {
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diff --git a/src/systemctl/systemctl.c b/src/systemctl/systemctl.c
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index e0dbf0fda9..ff8b4e9782 100644
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--- a/src/systemctl/systemctl.c
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+++ b/src/systemctl/systemctl.c
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@@ -5722,6 +5722,63 @@ finish:
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         return r;
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 }
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+static int show_installation_targets_client_side(const char *name) {
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+        UnitFileChange *changes = NULL;
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+        unsigned n_changes = 0, i;
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+        UnitFileFlags flags;
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+        char **p;
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+        int r;
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+
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+        p = STRV_MAKE(name);
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+        flags = UNIT_FILE_DRY_RUN |
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+                (arg_runtime ? UNIT_FILE_RUNTIME : 0);
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+
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+        r = unit_file_disable(UNIT_FILE_SYSTEM, flags, NULL, p, &changes, &n_changes);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to get file links for %s: %m", name);
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+
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+        for (i = 0; i < n_changes; i++)
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+                if (changes[i].type == UNIT_FILE_UNLINK)
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+                        printf("  %s\n", changes[i].path);
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+
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+        return 0;
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+}
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+
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+static int show_installation_targets(sd_bus *bus, const char *name) {
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+        _cleanup_(sd_bus_message_unrefp) sd_bus_message *reply = NULL;
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+        _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
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+        const char *link;
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+        int r;
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+
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+        r = sd_bus_call_method(
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+                        bus,
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+                        "org.freedesktop.systemd1",
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+                        "/org/freedesktop/systemd1",
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+                        "org.freedesktop.systemd1.Manager",
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+                        "GetUnitFileLinks",
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+                        &error,
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+                        &reply,
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+                        "sb", name, arg_runtime);
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+        if (r < 0)
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+                return log_error_errno(r, "Failed to get unit file links for %s: %s", name, bus_error_message(&error, r));
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+
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+        r = sd_bus_message_enter_container(reply, SD_BUS_TYPE_ARRAY, "s");
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+        if (r < 0)
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+                return bus_log_parse_error(r);
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+
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+        while ((r = sd_bus_message_read(reply, "s", &link)) > 0)
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+                printf("  %s\n", link);
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+
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+        if (r < 0)
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+                return bus_log_parse_error(r);
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+
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+        r = sd_bus_message_exit_container(reply);
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+        if (r < 0)
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+                return bus_log_parse_error(r);
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+
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+        return 0;
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+}
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+
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 static int unit_is_enabled(sd_bus *bus, char **args) {
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         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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@@ -5755,8 +5812,14 @@ static int unit_is_enabled(sd_bus *bus, char **args) {
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                             state == UNIT_FILE_INDIRECT)
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                                 enabled = true;
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-                        if (!arg_quiet)
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+                        if (!arg_quiet) {
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                                 puts(unit_file_state_to_string(state));
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+                                if (arg_full) {
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+                                        r = show_installation_targets_client_side(*name);
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+                                        if (r < 0)
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+                                                return r;
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+                                }
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+                        }
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                 }
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         } else {
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@@ -5785,8 +5848,14 @@ static int unit_is_enabled(sd_bus *bus, char **args) {
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                         if (STR_IN_SET(s, "enabled", "enabled-runtime", "static", "indirect"))
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                                 enabled = true;
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-                        if (!arg_quiet)
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+                        if (!arg_quiet) {
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                                 puts(s);
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+                                if (arg_full) {
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+                                        r = show_installation_targets(bus, *name);
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+                                        if (r < 0)
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+                                                return r;
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+                                }
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+                        }
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                 }
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         }
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