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authorLennart Poettering <lennart@poettering.net>2016-06-14 16:50:45 +0200
committerLennart Poettering <lennart@poettering.net>2016-06-15 23:00:27 +0200
commit7bce046bcf076e9cb359f1c78951b879430edb9e (patch)
tree9baa942b069efbee5e9030530792559bfb169846 /src
parentfd1f9c89f72ebbe5d071cccf7754299fc87b9b26 (diff)
core: set $JOURNAL_STREAM to the dev_t/ino_t of the journal stream of executed services
This permits services to detect whether their stdout/stderr is connected to the journal, and if so talk to the journal directly, thus permitting carrying of metadata. As requested by the gtk folks: #2473
Diffstat (limited to 'src')
-rw-r--r--src/basic/formats-util.h16
-rw-r--r--src/core/execute.c50
2 files changed, 59 insertions, 7 deletions
diff --git a/src/basic/formats-util.h b/src/basic/formats-util.h
index 9b4e8e98fa..39a185f59b 100644
--- a/src/basic/formats-util.h
+++ b/src/basic/formats-util.h
@@ -61,3 +61,19 @@
#else
# error Unknown rlim_t size
#endif
+
+#if SIZEOF_DEV_T == 8
+# define DEV_FMT "%" PRIu64
+#elif SIZEOF_DEV_T == 4
+# define DEV_FMT "%" PRIu32
+#else
+# error Unknown dev_t size
+#endif
+
+#if SIZEOF_INO_T == 8
+# define INO_FMT "%" PRIu64
+#elif SIZEOF_INO_T == 4
+# define INO_FMT "%" PRIu32
+#else
+# error Unknown ino_t size
+#endif
diff --git a/src/core/execute.c b/src/core/execute.c
index b5a5997f15..3c3369373f 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -454,7 +454,10 @@ static int setup_output(
int fileno,
int socket_fd,
const char *ident,
- uid_t uid, gid_t gid) {
+ uid_t uid,
+ gid_t gid,
+ dev_t *journal_stream_dev,
+ ino_t *journal_stream_ino) {
ExecOutput o;
ExecInput i;
@@ -464,6 +467,8 @@ static int setup_output(
assert(context);
assert(params);
assert(ident);
+ assert(journal_stream_dev);
+ assert(journal_stream_ino);
if (fileno == STDOUT_FILENO && params->stdout_fd >= 0) {
@@ -543,6 +548,17 @@ static int setup_output(
if (r < 0) {
log_unit_error_errno(unit, r, "Failed to connect %s to the journal socket, ignoring: %m", fileno == STDOUT_FILENO ? "stdout" : "stderr");
r = open_null_as(O_WRONLY, fileno);
+ } else {
+ struct stat st;
+
+ /* If we connected this fd to the journal via a stream, patch the device/inode into the passed
+ * parameters, but only then. This is useful so that we can set $JOURNAL_STREAM that permits
+ * services to detect whether they are connected to the journal or not. */
+
+ if (fstat(fileno, &st) >= 0) {
+ *journal_stream_dev = st.st_dev;
+ *journal_stream_ino = st.st_ino;
+ }
}
return r;
@@ -1286,6 +1302,8 @@ static int build_environment(
const char *home,
const char *username,
const char *shell,
+ dev_t journal_stream_dev,
+ ino_t journal_stream_ino,
char ***ret) {
_cleanup_strv_free_ char **our_env = NULL;
@@ -1295,7 +1313,7 @@ static int build_environment(
assert(c);
assert(ret);
- our_env = new0(char*, 11);
+ our_env = new0(char*, 12);
if (!our_env)
return -ENOMEM;
@@ -1367,8 +1385,15 @@ static int build_environment(
our_env[n_env++] = x;
}
+ if (journal_stream_dev != 0 && journal_stream_ino != 0) {
+ if (asprintf(&x, "JOURNAL_STREAM=" DEV_FMT ":" INO_FMT, journal_stream_dev, journal_stream_ino) < 0)
+ return -ENOMEM;
+
+ our_env[n_env++] = x;
+ }
+
our_env[n_env++] = NULL;
- assert(n_env <= 11);
+ assert(n_env <= 12);
*ret = our_env;
our_env = NULL;
@@ -1481,10 +1506,12 @@ static int exec_child(
_cleanup_strv_free_ char **our_env = NULL, **pass_env = NULL, **accum_env = NULL, **final_argv = NULL;
_cleanup_free_ char *mac_selinux_context_net = NULL;
const char *username = NULL, *home = NULL, *shell = NULL, *wd;
+ dev_t journal_stream_dev = 0;
+ ino_t journal_stream_ino = 0;
+ bool needs_mount_namespace;
uid_t uid = UID_INVALID;
gid_t gid = GID_INVALID;
int i, r;
- bool needs_mount_namespace;
assert(unit);
assert(command);
@@ -1584,13 +1611,13 @@ static int exec_child(
return r;
}
- r = setup_output(unit, context, params, STDOUT_FILENO, socket_fd, basename(command->path), uid, gid);
+ r = setup_output(unit, context, params, STDOUT_FILENO, socket_fd, basename(command->path), uid, gid, &journal_stream_dev, &journal_stream_ino);
if (r < 0) {
*exit_status = EXIT_STDOUT;
return r;
}
- r = setup_output(unit, context, params, STDERR_FILENO, socket_fd, basename(command->path), uid, gid);
+ r = setup_output(unit, context, params, STDERR_FILENO, socket_fd, basename(command->path), uid, gid, &journal_stream_dev, &journal_stream_ino);
if (r < 0) {
*exit_status = EXIT_STDERR;
return r;
@@ -1729,7 +1756,16 @@ static int exec_child(
}
}
- r = build_environment(context, params, n_fds, home, username, shell, &our_env);
+ r = build_environment(
+ context,
+ params,
+ n_fds,
+ home,
+ username,
+ shell,
+ journal_stream_dev,
+ journal_stream_ino,
+ &our_env);
if (r < 0) {
*exit_status = EXIT_MEMORY;
return r;