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systemd/0174-exec-factor-out-most-function-arguments-of-exec_spaw.patch
Zbigniew Jędrzejewski-Szmek 62fe9450da Update to latest git
2014-10-07 15:51:56 -04:00

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From 9fa95f8539a380e93f760956bc6982e57f5bf3af Mon Sep 17 00:00:00 2001
From: Daniel Mack <zonque@gmail.com>
Date: Sat, 23 Aug 2014 15:28:37 +0200
Subject: [PATCH] exec: factor out most function arguments of exec_spawn() to
ExecParameters
This way, the list of arguments to that function gets more comprehensive,
and we can get around passing lots of NULL and 0 arguments from socket.c,
swap.c and mount.c.
It also allows for splitting up the code in exec_spawn().
While at it, make ExecContext const in execute.c.
---
src/core/execute.c | 89 ++++++++++++++++++++++++------------------------------
src/core/execute.h | 33 +++++++++++---------
src/core/mount.c | 26 ++++++++--------
src/core/service.c | 32 ++++++++++++--------
src/core/socket.c | 27 +++++++++--------
src/core/swap.c | 26 ++++++++--------
6 files changed, 117 insertions(+), 116 deletions(-)
diff --git a/src/core/execute.c b/src/core/execute.c
index 066efd6fdf..e683fa5e16 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -1138,7 +1138,7 @@ static void do_idle_pipe_dance(int idle_pipe[4]) {
}
static int build_environment(
- ExecContext *c,
+ const ExecContext *c,
unsigned n_fds,
usec_t watchdog_usec,
const char *home,
@@ -1224,67 +1224,56 @@ static int build_environment(
}
int exec_spawn(ExecCommand *command,
- char **argv,
- ExecContext *context,
- int fds[], unsigned n_fds,
- char **environment,
- bool apply_permissions,
- bool apply_chroot,
- bool apply_tty_stdin,
- bool confirm_spawn,
- CGroupControllerMask cgroup_supported,
- const char *cgroup_path,
- const char *runtime_prefix,
- const char *unit_id,
- usec_t watchdog_usec,
- int idle_pipe[4],
+ const ExecContext *context,
+ const ExecParameters *exec_params,
ExecRuntime *runtime,
pid_t *ret) {
_cleanup_strv_free_ char **files_env = NULL;
+ int *fds = NULL; unsigned n_fds = 0;
int socket_fd;
- char *line;
+ char *line, **argv;
pid_t pid;
int r;
assert(command);
assert(context);
assert(ret);
- assert(fds || n_fds <= 0);
+ assert(exec_params);
+ assert(exec_params->fds || exec_params->n_fds <= 0);
if (context->std_input == EXEC_INPUT_SOCKET ||
context->std_output == EXEC_OUTPUT_SOCKET ||
context->std_error == EXEC_OUTPUT_SOCKET) {
- if (n_fds != 1)
+ if (exec_params->n_fds != 1)
return -EINVAL;
- socket_fd = fds[0];
-
- fds = NULL;
- n_fds = 0;
- } else
+ socket_fd = exec_params->fds[0];
+ } else {
socket_fd = -1;
+ fds = exec_params->fds;
+ n_fds = exec_params->n_fds;
+ }
r = exec_context_load_environment(context, &files_env);
if (r < 0) {
log_struct_unit(LOG_ERR,
- unit_id,
+ exec_params->unit_id,
"MESSAGE=Failed to load environment files: %s", strerror(-r),
"ERRNO=%d", -r,
NULL);
return r;
}
- if (!argv)
- argv = command->argv;
+ argv = exec_params->argv ?: command->argv;
line = exec_command_line(argv);
if (!line)
return log_oom();
log_struct_unit(LOG_DEBUG,
- unit_id,
+ exec_params->unit_id,
"EXECUTABLE=%s", command->path,
"MESSAGE=About to execute: %s", line,
NULL);
@@ -1324,8 +1313,8 @@ int exec_spawn(ExecCommand *command,
goto fail_child;
}
- if (idle_pipe)
- do_idle_pipe_dance(idle_pipe);
+ if (exec_params->idle_pipe)
+ do_idle_pipe_dance(exec_params->idle_pipe);
/* Close sockets very early to make sure we don't
* block init reexecution because it cannot bind its
@@ -1360,7 +1349,7 @@ int exec_spawn(ExecCommand *command,
exec_context_tty_reset(context);
- if (confirm_spawn) {
+ if (exec_params->confirm_spawn) {
char response;
err = ask_for_confirmation(&response, argv);
@@ -1385,26 +1374,26 @@ int exec_spawn(ExecCommand *command,
if (socket_fd >= 0)
fd_nonblock(socket_fd, false);
- err = setup_input(context, socket_fd, apply_tty_stdin);
+ err = setup_input(context, socket_fd, exec_params->apply_tty_stdin);
if (err < 0) {
r = EXIT_STDIN;
goto fail_child;
}
- err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
+ err = setup_output(context, STDOUT_FILENO, socket_fd, basename(command->path), exec_params->unit_id, exec_params->apply_tty_stdin);
if (err < 0) {
r = EXIT_STDOUT;
goto fail_child;
}
- err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), unit_id, apply_tty_stdin);
+ err = setup_output(context, STDERR_FILENO, socket_fd, basename(command->path), exec_params->unit_id, exec_params->apply_tty_stdin);
if (err < 0) {
r = EXIT_STDERR;
goto fail_child;
}
- if (cgroup_path) {
- err = cg_attach_everywhere(cgroup_supported, cgroup_path, 0);
+ if (exec_params->cgroup_path) {
+ err = cg_attach_everywhere(exec_params->cgroup_supported, exec_params->cgroup_path, 0);
if (err < 0) {
r = EXIT_CGROUP;
goto fail_child;
@@ -1497,15 +1486,15 @@ int exec_spawn(ExecCommand *command,
}
#ifdef HAVE_PAM
- if (cgroup_path && context->user && context->pam_name) {
- err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0644, uid, gid);
+ if (exec_params->cgroup_path && context->user && context->pam_name) {
+ err = cg_set_task_access(SYSTEMD_CGROUP_CONTROLLER, exec_params->cgroup_path, 0644, uid, gid);
if (err < 0) {
r = EXIT_CGROUP;
goto fail_child;
}
- err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, 0755, uid, gid);
+ err = cg_set_group_access(SYSTEMD_CGROUP_CONTROLLER, exec_params->cgroup_path, 0755, uid, gid);
if (err < 0) {
r = EXIT_CGROUP;
goto fail_child;
@@ -1513,13 +1502,13 @@ int exec_spawn(ExecCommand *command,
}
#endif
- if (!strv_isempty(context->runtime_directory) && runtime_prefix) {
+ if (!strv_isempty(context->runtime_directory) && exec_params->runtime_prefix) {
char **rt;
STRV_FOREACH(rt, context->runtime_directory) {
_cleanup_free_ char *p;
- p = strjoin(runtime_prefix, "/", *rt, NULL);
+ p = strjoin(exec_params->runtime_prefix, "/", *rt, NULL);
if (!p) {
r = EXIT_RUNTIME_DIRECTORY;
err = -ENOMEM;
@@ -1534,7 +1523,7 @@ int exec_spawn(ExecCommand *command,
}
}
- if (apply_permissions) {
+ if (exec_params->apply_permissions) {
err = enforce_groups(context, username, gid);
if (err < 0) {
r = EXIT_GROUP;
@@ -1545,7 +1534,7 @@ int exec_spawn(ExecCommand *command,
umask(context->umask);
#ifdef HAVE_PAM
- if (apply_permissions && context->pam_name && username) {
+ if (exec_params->apply_permissions && context->pam_name && username) {
err = setup_pam(context->pam_name, username, uid, context->tty_path, &pam_env, fds, n_fds);
if (err < 0) {
r = EXIT_PAM;
@@ -1601,7 +1590,7 @@ int exec_spawn(ExecCommand *command,
}
}
- if (apply_chroot) {
+ if (exec_params->apply_chroot) {
if (context->root_directory)
if (chroot(context->root_directory) < 0) {
err = -errno;
@@ -1646,7 +1635,7 @@ int exec_spawn(ExecCommand *command,
goto fail_child;
}
- if (apply_permissions) {
+ if (exec_params->apply_permissions) {
for (i = 0; i < _RLIMIT_MAX; i++) {
if (!context->rlimit[i])
@@ -1742,14 +1731,14 @@ int exec_spawn(ExecCommand *command,
#endif
}
- err = build_environment(context, n_fds, watchdog_usec, home, username, shell, &our_env);
+ err = build_environment(context, n_fds, exec_params->watchdog_usec, home, username, shell, &our_env);
if (r < 0) {
r = EXIT_MEMORY;
goto fail_child;
}
final_env = strv_env_merge(5,
- environment,
+ exec_params->environment,
our_env,
context->environment,
files_env,
@@ -1775,7 +1764,7 @@ int exec_spawn(ExecCommand *command,
if (line) {
log_open();
log_struct_unit(LOG_DEBUG,
- unit_id,
+ exec_params->unit_id,
"EXECUTABLE=%s", command->path,
"MESSAGE=Executing: %s", line,
NULL);
@@ -1805,7 +1794,7 @@ int exec_spawn(ExecCommand *command,
}
log_struct_unit(LOG_DEBUG,
- unit_id,
+ exec_params->unit_id,
"MESSAGE=Forked %s as "PID_FMT,
command->path, pid,
NULL);
@@ -1815,8 +1804,8 @@ int exec_spawn(ExecCommand *command,
* outside of the cgroup) and in the parent (so that we can be
* sure that when we kill the cgroup the process will be
* killed too). */
- if (cgroup_path)
- cg_attach(SYSTEMD_CGROUP_CONTROLLER, cgroup_path, pid);
+ if (exec_params->cgroup_path)
+ cg_attach(SYSTEMD_CGROUP_CONTROLLER, exec_params->cgroup_path, pid);
exec_status_start(&command->exec_status, pid);
diff --git a/src/core/execute.h b/src/core/execute.h
index 9d05d3a9de..f31f0c9f27 100644
--- a/src/core/execute.h
+++ b/src/core/execute.h
@@ -25,6 +25,7 @@ typedef struct ExecStatus ExecStatus;
typedef struct ExecCommand ExecCommand;
typedef struct ExecContext ExecContext;
typedef struct ExecRuntime ExecRuntime;
+typedef struct ExecParameters ExecParameters;
#include <linux/types.h>
#include <sys/time.h>
@@ -191,21 +192,25 @@ struct ExecContext {
#include "cgroup.h"
+struct ExecParameters {
+ char **argv;
+ int *fds; unsigned n_fds;
+ char **environment;
+ bool apply_permissions;
+ bool apply_chroot;
+ bool apply_tty_stdin;
+ bool confirm_spawn;
+ CGroupControllerMask cgroup_supported;
+ const char *cgroup_path;
+ const char *runtime_prefix;
+ const char *unit_id;
+ usec_t watchdog_usec;
+ int *idle_pipe;
+};
+
int exec_spawn(ExecCommand *command,
- char **argv,
- ExecContext *context,
- int fds[], unsigned n_fds,
- char **environment,
- bool apply_permissions,
- bool apply_chroot,
- bool apply_tty_stdin,
- bool confirm_spawn,
- CGroupControllerMask cgroup_mask,
- const char *cgroup_path,
- const char *runtime_prefix,
- const char *unit_id,
- usec_t watchdog_usec,
- int pipe_fd[2],
+ const ExecContext *context,
+ const ExecParameters *exec_params,
ExecRuntime *runtime,
pid_t *ret);
diff --git a/src/core/mount.c b/src/core/mount.c
index ec90b0a670..e284357c6f 100644
--- a/src/core/mount.c
+++ b/src/core/mount.c
@@ -691,6 +691,11 @@ static void mount_dump(Unit *u, FILE *f, const char *prefix) {
static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
pid_t pid;
int r;
+ ExecParameters exec_params = {
+ .apply_permissions = true,
+ .apply_chroot = true,
+ .apply_tty_stdin = true,
+ };
assert(m);
assert(c);
@@ -706,21 +711,16 @@ static int mount_spawn(Mount *m, ExecCommand *c, pid_t *_pid) {
if (r < 0)
goto fail;
+ exec_params.environment = UNIT(m)->manager->environment;
+ exec_params.confirm_spawn = UNIT(m)->manager->confirm_spawn;
+ exec_params.cgroup_supported = UNIT(m)->manager->cgroup_supported;
+ exec_params.cgroup_path = UNIT(m)->cgroup_path;
+ exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(m)->manager);
+ exec_params.unit_id = UNIT(m)->id;
+
r = exec_spawn(c,
- NULL,
&m->exec_context,
- NULL, 0,
- UNIT(m)->manager->environment,
- true,
- true,
- true,
- UNIT(m)->manager->confirm_spawn,
- UNIT(m)->manager->cgroup_supported,
- UNIT(m)->cgroup_path,
- manager_get_runtime_prefix(UNIT(m)->manager),
- UNIT(m)->id,
- 0,
- NULL,
+ &exec_params,
m->exec_runtime,
&pid);
if (r < 0)
diff --git a/src/core/service.c b/src/core/service.c
index 223e4b3a41..f3775f24c4 100644
--- a/src/core/service.c
+++ b/src/core/service.c
@@ -892,6 +892,11 @@ static int service_spawn(
_cleanup_strv_free_ char
**argv = NULL, **final_env = NULL, **our_env = NULL;
const char *path;
+ ExecParameters exec_params = {
+ .apply_permissions = apply_permissions,
+ .apply_chroot = apply_chroot,
+ .apply_tty_stdin = apply_tty_stdin,
+ };
assert(s);
assert(c);
@@ -967,21 +972,22 @@ static int service_spawn(
} else
path = UNIT(s)->cgroup_path;
+ exec_params.argv = argv;
+ exec_params.fds = fds;
+ exec_params.n_fds = n_fds;
+ exec_params.environment = final_env;
+ exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
+ exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
+ exec_params.cgroup_path = path;
+ exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
+ exec_params.unit_id = UNIT(s)->id;
+ exec_params.watchdog_usec = s->watchdog_usec;
+ if (s->type == SERVICE_IDLE)
+ exec_params.idle_pipe = UNIT(s)->manager->idle_pipe;
+
r = exec_spawn(c,
- argv,
&s->exec_context,
- fds, n_fds,
- final_env,
- apply_permissions,
- apply_chroot,
- apply_tty_stdin,
- UNIT(s)->manager->confirm_spawn,
- UNIT(s)->manager->cgroup_supported,
- path,
- manager_get_runtime_prefix(UNIT(s)->manager),
- UNIT(s)->id,
- s->watchdog_usec,
- s->type == SERVICE_IDLE ? UNIT(s)->manager->idle_pipe : NULL,
+ &exec_params,
s->exec_runtime,
&pid);
if (r < 0)
diff --git a/src/core/socket.c b/src/core/socket.c
index 7ca8edbda8..68e21e60ac 100644
--- a/src/core/socket.c
+++ b/src/core/socket.c
@@ -1358,6 +1358,11 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
_cleanup_free_ char **argv = NULL;
pid_t pid;
int r;
+ ExecParameters exec_params = {
+ .apply_permissions = true,
+ .apply_chroot = true,
+ .apply_tty_stdin = true,
+ };
assert(s);
assert(c);
@@ -1377,21 +1382,17 @@ static int socket_spawn(Socket *s, ExecCommand *c, pid_t *_pid) {
if (r < 0)
goto fail;
+ exec_params.argv = argv;
+ exec_params.environment = UNIT(s)->manager->environment;
+ exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
+ exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
+ exec_params.cgroup_path = UNIT(s)->cgroup_path;
+ exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
+ exec_params.unit_id = UNIT(s)->id;
+
r = exec_spawn(c,
- argv,
&s->exec_context,
- NULL, 0,
- UNIT(s)->manager->environment,
- true,
- true,
- true,
- UNIT(s)->manager->confirm_spawn,
- UNIT(s)->manager->cgroup_supported,
- UNIT(s)->cgroup_path,
- manager_get_runtime_prefix(UNIT(s)->manager),
- UNIT(s)->id,
- 0,
- NULL,
+ &exec_params,
s->exec_runtime,
&pid);
if (r < 0)
diff --git a/src/core/swap.c b/src/core/swap.c
index 9f353af430..019d32ed0d 100644
--- a/src/core/swap.c
+++ b/src/core/swap.c
@@ -619,6 +619,11 @@ static void swap_dump(Unit *u, FILE *f, const char *prefix) {
static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
pid_t pid;
int r;
+ ExecParameters exec_params = {
+ .apply_permissions = true,
+ .apply_chroot = true,
+ .apply_tty_stdin = true,
+ };
assert(s);
assert(c);
@@ -634,21 +639,16 @@ static int swap_spawn(Swap *s, ExecCommand *c, pid_t *_pid) {
if (r < 0)
goto fail;
+ exec_params.environment = UNIT(s)->manager->environment;
+ exec_params.confirm_spawn = UNIT(s)->manager->confirm_spawn;
+ exec_params.cgroup_supported = UNIT(s)->manager->cgroup_supported;
+ exec_params.cgroup_path = UNIT(s)->cgroup_path;
+ exec_params.runtime_prefix = manager_get_runtime_prefix(UNIT(s)->manager);
+ exec_params.unit_id = UNIT(s)->id;
+
r = exec_spawn(c,
- NULL,
&s->exec_context,
- NULL, 0,
- UNIT(s)->manager->environment,
- true,
- true,
- true,
- UNIT(s)->manager->confirm_spawn,
- UNIT(s)->manager->cgroup_supported,
- UNIT(s)->cgroup_path,
- manager_get_runtime_prefix(UNIT(s)->manager),
- UNIT(s)->id,
- 0,
- NULL,
+ &exec_params,
s->exec_runtime,
&pid);
if (r < 0)
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