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From 5532bedf8ef456f02fdec62d46bc1be65cdfde30 Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Tue, 28 Apr 2015 12:21:31 +0200
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Subject: [PATCH] run: synchronously wait until the scope unit we create is
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 started
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Otherwise it might happen that by the time PID 1 adds our process to the
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scope unit the process might already have died, if the process is
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short-running (such as an invocation to /bin/true).
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https://bugs.freedesktop.org/show_bug.cgi?id=86520
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Cherry-picked from: de158ed22db60e3a6654557fa4aa72f7248550af
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Resolves: #1272368
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---
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 src/libsystemd/sd-bus/bus-util.c | 10 ++++++++++
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 src/libsystemd/sd-bus/bus-util.h |  1 +
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 src/run/run.c                    | 42 +++++++++++++++++++++++++++++++++-------
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 3 files changed, 46 insertions(+), 7 deletions(-)
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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 e48abf55a..6d5615082 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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@@ -1854,6 +1854,16 @@ int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path) {
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         return set_put_strdup(d->jobs, path);
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 }
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+int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet) {
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+        int r;
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+
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+        r = bus_wait_for_jobs_add(d, path);
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+        if (r < 0)
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+                return log_oom();
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+
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+        return bus_wait_for_jobs(d, quiet);
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+}
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+
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 int bus_deserialize_and_dump_unit_file_changes(sd_bus_message *m, bool quiet, UnitFileChange **changes, unsigned *n_changes) {
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         const char *type, *path, *source;
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         int r;
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diff --git a/src/libsystemd/sd-bus/bus-util.h b/src/libsystemd/sd-bus/bus-util.h
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index 21db98228..8c8846c6e 100644
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--- a/src/libsystemd/sd-bus/bus-util.h
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+++ b/src/libsystemd/sd-bus/bus-util.h
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@@ -209,6 +209,7 @@ int bus_wait_for_jobs_new(sd_bus *bus, BusWaitForJobs **ret);
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 void bus_wait_for_jobs_free(BusWaitForJobs *d);
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 int bus_wait_for_jobs_add(BusWaitForJobs *d, const char *path);
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 int bus_wait_for_jobs(BusWaitForJobs *d, bool quiet);
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+int bus_wait_for_jobs_one(BusWaitForJobs *d, const char *path, bool quiet);
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 DEFINE_TRIVIAL_CLEANUP_FUNC(BusWaitForJobs*, bus_wait_for_jobs_free);
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diff --git a/src/run/run.c b/src/run/run.c
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index 0e5bde23d..dd1338f3b 100644
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--- a/src/run/run.c
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+++ b/src/run/run.c
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@@ -806,14 +806,20 @@ static int start_transient_scope(
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                 char **argv) {
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         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
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+        _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL;
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         _cleanup_strv_free_ char **env = NULL, **user_env = NULL;
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-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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         _cleanup_free_ char *scope = NULL;
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+        const char *object = NULL;
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         int r;
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         assert(bus);
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         assert(argv);
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+        r = bus_wait_for_jobs_new(bus, &w);
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+        if (r < 0)
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+                return log_oom();
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+
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         if (arg_unit) {
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                 scope = unit_name_mangle_with_suffix(arg_unit, MANGLE_NOGLOB, ".scope");
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                 if (!scope)
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@@ -854,7 +860,7 @@ static int start_transient_scope(
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         if (r < 0)
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                 return bus_log_create_error(r);
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-        r = sd_bus_call(bus, m, 0, &error, NULL);
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+        r = sd_bus_call(bus, m, 0, &error, &reply);
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         if (r < 0) {
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                 log_error("Failed to start transient scope unit: %s", bus_error_message(&error, -r));
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                 return r;
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@@ -914,8 +920,16 @@ static int start_transient_scope(
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         if (!env)
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                 return log_oom();
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+        r = sd_bus_message_read(reply, "o", &object);
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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 = bus_wait_for_jobs_one(w, object, arg_quiet);
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+        if (r < 0)
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+                return r;
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+
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         if (!arg_quiet)
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-                log_info("Running as unit %s.", scope);
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+                log_info("Running scope as unit %s.", scope);
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         execvpe(argv[0], argv, env);
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@@ -927,13 +941,19 @@ static int start_transient_timer(
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                 char **argv) {
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         _cleanup_bus_error_free_ sd_bus_error error = SD_BUS_ERROR_NULL;
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-        _cleanup_bus_message_unref_ sd_bus_message *m = NULL;
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+        _cleanup_bus_message_unref_ sd_bus_message *m = NULL, *reply = NULL;
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+        _cleanup_(bus_wait_for_jobs_freep) BusWaitForJobs *w = NULL;
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         _cleanup_free_ char *timer = NULL, *service = NULL;
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+        const char *object = NULL;
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         int r;
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         assert(bus);
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         assert(argv);
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+        r = bus_wait_for_jobs_new(bus, &w);
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+        if (r < 0)
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+                return log_oom();
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+
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         if (arg_unit) {
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                 switch(unit_name_to_type(arg_unit)) {
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@@ -1034,15 +1054,23 @@ static int start_transient_timer(
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         if (r < 0)
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                 return bus_log_create_error(r);
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-        r = sd_bus_call(bus, m, 0, &error, NULL);
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+        r = sd_bus_call(bus, m, 0, &error, &reply);
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         if (r < 0) {
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                 log_error("Failed to start transient timer unit: %s", bus_error_message(&error, -r));
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                 return r;
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         }
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-        log_info("Running as unit %s.", timer);
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+        r = sd_bus_message_read(reply, "o", &object);
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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 = bus_wait_for_jobs_one(w, object, arg_quiet);
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+        if (r < 0)
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+                return r;
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+
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+        log_info("Running timer as unit %s.", timer);
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         if (argv[0])
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-                log_info("Will run as unit %s.", service);
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+                log_info("Will run service as unit %s.", service);
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         return 0;
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 }