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From 2808e53f785e9ca7fdab286678e784b661b4c185 Mon Sep 17 00:00:00 2001
From: Zsolt Dollenstein <zsol.zsol@gmail.com>
Date: Tue, 3 Jul 2018 12:22:29 -0700
Subject: [PATCH] Add support for opening files for appending
Addresses part of #8983
(cherry picked from commit 566b7d23eb747e9c5a74e5647693077b52395fc5)
Resolves: #1809175
---
man/systemd.exec.xml | 16 ++++++----
src/core/dbus-execute.c | 30 ++++++++++++++-----
src/core/execute.c | 20 ++++++++++---
src/core/execute.h | 1 +
src/core/load-fragment.c | 11 +++++++
src/core/main.c | 4 +--
src/test/test-execute.c | 10 +++++++
test/meson.build | 2 ++
.../exec-standardoutput-append.service | 13 ++++++++
.../exec-standardoutput-file.service | 13 ++++++++
10 files changed, 101 insertions(+), 19 deletions(-)
create mode 100644 test/test-execute/exec-standardoutput-append.service
create mode 100644 test/test-execute/exec-standardoutput-file.service
diff --git a/man/systemd.exec.xml b/man/systemd.exec.xml
index bdaed68162..e2a5ede968 100644
--- a/man/systemd.exec.xml
+++ b/man/systemd.exec.xml
@@ -1792,8 +1792,8 @@ SystemCallErrorNumber=EPERM</programlisting>
of <option>inherit</option>, <option>null</option>, <option>tty</option>, <option>journal</option>,
<option>syslog</option>, <option>kmsg</option>, <option>journal+console</option>,
<option>syslog+console</option>, <option>kmsg+console</option>,
- <option>file:<replaceable>path</replaceable></option>, <option>socket</option> or
- <option>fd:<replaceable>name</replaceable></option>.</para>
+ <option>file:<replaceable>path</replaceable></option>, <option>append:<replaceable>path</replaceable></option>,
+ <option>socket</option> or<option>fd:<replaceable>name</replaceable></option>.</para>
<para><option>inherit</option> duplicates the file descriptor of standard input for standard output.</para>
@@ -1824,11 +1824,17 @@ SystemCallErrorNumber=EPERM</programlisting>
<para>The <option>file:<replaceable>path</replaceable></option> option may be used to connect a specific file
system object to standard output. The semantics are similar to the same option of
- <varname>StandardInput=</varname>, see above. If standard input and output are directed to the same file path,
- it is opened only once, for reading as well as writing and duplicated. This is particular useful when the
- specified path refers to an <constant>AF_UNIX</constant> socket in the file system, as in that case only a
+ <varname>StandardInput=</varname>, see above. If <replaceable>path</replaceable> refers to a regular file
+ on the filesystem, it is opened (created if it doesn't exist yet) for writing at the beginning of the file,
+ but without truncating it.
+ If standard input and output are directed to the same file path, it is opened only once, for reading as well
+ as writing and duplicated. This is particularly useful when the specified path refers to an
+ <constant>AF_UNIX</constant> socket in the file system, as in that case only a
single stream connection is created for both input and output.</para>
+ <para><option>append:<replaceable>path</replaceable></option> is similar to <option>file:<replaceable>path
+ </replaceable></option> above, but it opens the file in append mode.</para>
+
<para><option>socket</option> connects standard output to a socket acquired via socket activation. The
semantics are similar to the same option of <varname>StandardInput=</varname>, see above.</para>
diff --git a/src/core/dbus-execute.c b/src/core/dbus-execute.c
index e7c0b893d1..f9527e56b2 100644
--- a/src/core/dbus-execute.c
+++ b/src/core/dbus-execute.c
@@ -1772,7 +1772,10 @@ int bus_exec_context_set_transient_property(
return 1;
- } else if (STR_IN_SET(name, "StandardInputFile", "StandardOutputFile", "StandardErrorFile")) {
+ } else if (STR_IN_SET(name,
+ "StandardInputFile",
+ "StandardOutputFile", "StandardOutputFileToCreate", "StandardOutputFileToAppend",
+ "StandardErrorFile", "StandardErrorFileToCreate", "StandardErrorFileToAppend")) {
const char *s;
r = sd_bus_message_read(message, "s", &s);
@@ -1796,23 +1799,34 @@ int bus_exec_context_set_transient_property(
c->std_input = EXEC_INPUT_FILE;
unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardInput=file:%s", s);
- } else if (streq(name, "StandardOutputFile")) {
+ } else if (STR_IN_SET(name, "StandardOutputFile", "StandardOutputFileToAppend")) {
r = free_and_strdup(&c->stdio_file[STDOUT_FILENO], empty_to_null(s));
if (r < 0)
return r;
- c->std_output = EXEC_OUTPUT_FILE;
- unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardOutput=file:%s", s);
-
+ if (streq(name, "StandardOutputFile")) {
+ c->std_output = EXEC_OUTPUT_FILE;
+ unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardOutput=file:%s", s);
+ } else {
+ assert(streq(name, "StandardOutputFileToAppend"));
+ c->std_output = EXEC_OUTPUT_FILE_APPEND;
+ unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardOutput=append:%s", s);
+ }
} else {
- assert(streq(name, "StandardErrorFile"));
+ assert(STR_IN_SET(name, "StandardErrorFile", "StandardErrorFileToAppend"));
r = free_and_strdup(&c->stdio_file[STDERR_FILENO], empty_to_null(s));
if (r < 0)
return r;
- c->std_error = EXEC_OUTPUT_FILE;
- unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardError=file:%s", s);
+ if (streq(name, "StandardErrorFile")) {
+ c->std_error = EXEC_OUTPUT_FILE;
+ unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardOutput=file:%s", s);
+ } else {
+ assert(streq(name, "StandardErrorFileToAppend"));
+ c->std_error = EXEC_OUTPUT_FILE_APPEND;
+ unit_write_settingf(u, flags|UNIT_ESCAPE_SPECIFIERS, name, "StandardOutput=append:%s", s);
+ }
}
}
diff --git a/src/core/execute.c b/src/core/execute.c
index f012023224..3c54ac1110 100644
--- a/src/core/execute.c
+++ b/src/core/execute.c
@@ -89,6 +89,7 @@
#include "strv.h"
#include "syslog-util.h"
#include "terminal-util.h"
+#include "umask-util.h"
#include "unit.h"
#include "user-util.h"
#include "util.h"
@@ -675,9 +676,10 @@ static int setup_output(
(void) fd_nonblock(named_iofds[fileno], false);
return dup2(named_iofds[fileno], fileno) < 0 ? -errno : fileno;
- case EXEC_OUTPUT_FILE: {
+ case EXEC_OUTPUT_FILE:
+ case EXEC_OUTPUT_FILE_APPEND: {
bool rw;
- int fd;
+ int fd, flags;
assert(context->stdio_file[fileno]);
@@ -687,11 +689,16 @@ static int setup_output(
if (rw)
return dup2(STDIN_FILENO, fileno) < 0 ? -errno : fileno;
- fd = acquire_path(context->stdio_file[fileno], O_WRONLY, 0666 & ~context->umask);
+ flags = O_WRONLY;
+ if (o == EXEC_OUTPUT_FILE_APPEND)
+ flags |= O_APPEND;
+
+ fd = acquire_path(context->stdio_file[fileno], flags, 0666 & ~context->umask);
+
if (fd < 0)
return fd;
- return move_fd(fd, fileno, false);
+ return move_fd(fd, fileno, 0);
}
default:
@@ -4168,8 +4175,12 @@ void exec_context_dump(const ExecContext *c, FILE* f, const char *prefix) {
fprintf(f, "%sStandardInputFile: %s\n", prefix, c->stdio_file[STDIN_FILENO]);
if (c->std_output == EXEC_OUTPUT_FILE)
fprintf(f, "%sStandardOutputFile: %s\n", prefix, c->stdio_file[STDOUT_FILENO]);
+ if (c->std_output == EXEC_OUTPUT_FILE_APPEND)
+ fprintf(f, "%sStandardOutputFileToAppend: %s\n", prefix, c->stdio_file[STDOUT_FILENO]);
if (c->std_error == EXEC_OUTPUT_FILE)
fprintf(f, "%sStandardErrorFile: %s\n", prefix, c->stdio_file[STDERR_FILENO]);
+ if (c->std_error == EXEC_OUTPUT_FILE_APPEND)
+ fprintf(f, "%sStandardErrorFileToAppend: %s\n", prefix, c->stdio_file[STDERR_FILENO]);
if (c->tty_path)
fprintf(f,
@@ -5111,6 +5122,7 @@ static const char* const exec_output_table[_EXEC_OUTPUT_MAX] = {
[EXEC_OUTPUT_SOCKET] = "socket",
[EXEC_OUTPUT_NAMED_FD] = "fd",
[EXEC_OUTPUT_FILE] = "file",
+ [EXEC_OUTPUT_FILE_APPEND] = "append",
};
DEFINE_STRING_TABLE_LOOKUP(exec_output, ExecOutput);
diff --git a/src/core/execute.h b/src/core/execute.h
index 2266355962..86c1cee84c 100644
--- a/src/core/execute.h
+++ b/src/core/execute.h
@@ -57,6 +57,7 @@ typedef enum ExecOutput {
EXEC_OUTPUT_SOCKET,
EXEC_OUTPUT_NAMED_FD,
EXEC_OUTPUT_FILE,
+ EXEC_OUTPUT_FILE_APPEND,
_EXEC_OUTPUT_MAX,
_EXEC_OUTPUT_INVALID = -1
} ExecOutput;
diff --git a/src/core/load-fragment.c b/src/core/load-fragment.c
index 2082166afb..9b2724307d 100644
--- a/src/core/load-fragment.c
+++ b/src/core/load-fragment.c
@@ -1016,6 +1016,17 @@ int config_parse_exec_output(
eo = EXEC_OUTPUT_FILE;
+ } else if ((n = startswith(rvalue, "append:"))) {
+
+ r = unit_full_printf(u, n, &resolved);
+ if (r < 0)
+ return log_syntax(unit, LOG_ERR, filename, line, r, "Failed to resolve unit specifiers in %s: %m", n);
+
+ r = path_simplify_and_warn(resolved, PATH_CHECK_ABSOLUTE | PATH_CHECK_FATAL, unit, filename, line, lvalue);
+ if (r < 0)
+ return -ENOEXEC;
+
+ eo = EXEC_OUTPUT_FILE_APPEND;
} else {
eo = exec_output_from_string(rvalue);
if (eo < 0) {
diff --git a/src/core/main.c b/src/core/main.c
index 9f238a8430..25536054b3 100644
--- a/src/core/main.c
+++ b/src/core/main.c
@@ -620,8 +620,8 @@ static int config_parse_output_restricted(
return 0;
}
- if (IN_SET(t, EXEC_OUTPUT_SOCKET, EXEC_OUTPUT_NAMED_FD, EXEC_OUTPUT_FILE)) {
- log_syntax(unit, LOG_ERR, filename, line, 0, "Standard output types socket, fd:, file: are not supported as defaults, ignoring: %s", rvalue);
+ if (IN_SET(t, EXEC_OUTPUT_SOCKET, EXEC_OUTPUT_NAMED_FD, EXEC_OUTPUT_FILE, EXEC_OUTPUT_FILE_APPEND)) {
+ log_syntax(unit, LOG_ERR, filename, line, 0, "Standard output types socket, fd:, file:, append: are not supported as defaults, ignoring: %s", rvalue);
return 0;
}
diff --git a/src/test/test-execute.c b/src/test/test-execute.c
index 637ffe96bb..0f8dc883b1 100644
--- a/src/test/test-execute.c
+++ b/src/test/test-execute.c
@@ -651,6 +651,14 @@ static void test_exec_standardinput(Manager *m) {
test(m, "exec-standardinput-file.service", 0, CLD_EXITED);
}
+static void test_exec_standardoutput(Manager *m) {
+ test(m, "exec-standardoutput-file.service", 0, CLD_EXITED);
+}
+
+static void test_exec_standardoutput_append(Manager *m) {
+ test(m, "exec-standardoutput-append.service", 0, CLD_EXITED);
+}
+
static int run_tests(UnitFileScope scope, const test_function_t *tests) {
const test_function_t *test = NULL;
_cleanup_(manager_freep) Manager *m = NULL;
@@ -698,6 +706,8 @@ int main(int argc, char *argv[]) {
test_exec_restrictnamespaces,
test_exec_runtimedirectory,
test_exec_standardinput,
+ test_exec_standardoutput,
+ test_exec_standardoutput_append,
test_exec_supplementarygroups,
test_exec_systemcallerrornumber,
test_exec_systemcallfilter,
diff --git a/test/meson.build b/test/meson.build
index fb9f2cdb9b..4d1c51048c 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -115,6 +115,8 @@ test_data_files = '''
test-execute/exec-specifier@.service
test-execute/exec-standardinput-data.service
test-execute/exec-standardinput-file.service
+ test-execute/exec-standardoutput-file.service
+ test-execute/exec-standardoutput-append.service
test-execute/exec-supplementarygroups-multiple-groups-default-group-user.service
test-execute/exec-supplementarygroups-multiple-groups-withgid.service
test-execute/exec-supplementarygroups-multiple-groups-withuid.service
diff --git a/test/test-execute/exec-standardoutput-append.service b/test/test-execute/exec-standardoutput-append.service
new file mode 100644
index 0000000000..8983bb056b
--- /dev/null
+++ b/test/test-execute/exec-standardoutput-append.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Test for StandardOutput=append:
+
+[Service]
+ExecStartPre=sh -c 'printf "hello\n" > /tmp/test-exec-standardoutput-output'
+ExecStartPre=sh -c 'printf "hello\nhello\n" > /tmp/test-exec-standardoutput-expected'
+StandardInput=data
+StandardInputText=hello
+StandardOutput=append:/tmp/test-exec-standardoutput-output
+StandardError=null
+ExecStart=cat
+ExecStart=cmp /tmp/test-exec-standardoutput-output /tmp/test-exec-standardoutput-expected
+Type=oneshot
diff --git a/test/test-execute/exec-standardoutput-file.service b/test/test-execute/exec-standardoutput-file.service
new file mode 100644
index 0000000000..71e2604b94
--- /dev/null
+++ b/test/test-execute/exec-standardoutput-file.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Test for StandardOutput=file:
+
+[Service]
+ExecStartPre=sh -c 'printf "nooo\nhello\n" > /tmp/test-exec-standardoutput-output'
+ExecStartPre=sh -c 'printf "hello\nello\n" > /tmp/test-exec-standardoutput-expected'
+StandardInput=data
+StandardInputText=hello
+StandardOutput=file:/tmp/test-exec-standardoutput-output
+StandardError=null
+ExecStart=cat
+ExecStart=cmp /tmp/test-exec-standardoutput-expected /tmp/test-exec-standardoutput-output
+Type=oneshot
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