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exec: extend variable substitution to support splitting variable values into seperate arguments

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This commit is contained in:
Lennart Poettering 2010-07-21 02:57:35 +02:00
parent 9d25f5ed7b
commit c24eb49e6a
8 changed files with 127 additions and 16 deletions
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12
Makefile.am
View File

@ -77,7 +77,8 @@ noinst_PROGRAMS = \
test-ns \
test-loopback \
test-daemon \
test-cgroup
test-cgroup \
test-env-replace
if HAVE_PAM
pamlib_LTLIBRARIES = \
@ -446,6 +447,15 @@ test_cgroup_CFLAGS = \
test_cgroup_LDADD = \
libsystemd-basic.la
test_env_replace_SOURCES = \
src/test-env-replace.c
test_env_replace_CFLAGS = \
$(AM_CFLAGS)
test_env_replace_LDADD = \
libsystemd-basic.la
systemd_logger_SOURCES = \
src/logger.c \
src/sd-daemon.c \

4
fixme
View File

@ -35,9 +35,9 @@
* systemctl status $PID, systemctl stop $PID!
* place /etc/inittab with explaining blurb.
/dev/null symlinks supporten
* In command lines, support both "$FOO" and $FOO
* place /etc/inittab with explaining blurb.
* /etc must always take precedence even if we follow symlinks!

12
man/systemd.service.xml
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@ -274,10 +274,14 @@
<citerefentry><refentrytitle>systemd.unit</refentrytitle><manvolnum>5</manvolnum></citerefentry>. On
top of that basic environment variable
substitution is supported, where
<literal>$(FOO)</literal> is replaced
by the value of the environment
variable of the same
name.</para></listitem>
<literal>${FOO}</literal> is replaced
by the string value of the environment
variable of the same name. Also
<literal>$FOO</literal> may appear as
seperate word on the command line in
which case the variable is replaced by
its value split at
whitespaces.</para></listitem>
</varlistentry>
<varlistentry>

59
src/test-env-replace.c Normal file
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@ -0,0 +1,59 @@
/*-*- Mode: C; c-basic-offset: 8 -*-*/
/***
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
systemd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include <unistd.h>
#include <string.h>
#include "util.h"
#include "log.h"
#include "strv.h"
int main(int argc, char *argv[]) {
const char *env[] = {
"FOO=BAR BAR",
"BAR=waldo",
NULL
};
const char *line[] = {
"FOO$FOO",
"FOO$FOOFOO",
"FOO${FOO}$FOO",
"FOO${FOO}",
"${FOO}",
"$FOO",
"$FOO$FOO",
"${FOO}${BAR}",
"${FOO",
NULL
};
char **i, **r;
r = replace_env_argv((char**) line, (char**) env);
STRV_FOREACH(i, r)
printf("%s\n", *i);
strv_free(r);
}

51
src/util.c
View File

@ -2778,7 +2778,7 @@ void status_welcome(void) {
char *replace_env(const char *format, char **env) {
enum {
WORD,
DOLLAR,
CURLY,
VARIABLE
} state = WORD;
@ -2793,11 +2793,11 @@ char *replace_env(const char *format, char **env) {
case WORD:
if (*e == '$')
state = DOLLAR;
state = CURLY;
break;
case DOLLAR:
if (*e == '(') {
case CURLY:
if (*e == '{') {
if (!(k = strnappend(r, word, e-word-1)))
goto fail;
@ -2821,7 +2821,7 @@ char *replace_env(const char *format, char **env) {
break;
case VARIABLE:
if (*e == ')') {
if (*e == '}') {
char *t;
if ((t = strv_env_get_with_length(env, word+2, e-word-2))) {
@ -2853,12 +2853,49 @@ fail:
char **replace_env_argv(char **argv, char **env) {
char **r, **i;
unsigned k = 0;
unsigned k = 0, l = 0;
if (!(r = new(char*, strv_length(argv)+1)))
l = strv_length(argv);
if (!(r = new(char*, l+1)))
return NULL;
STRV_FOREACH(i, argv) {
/* If $FOO appears as single word, replace it by the split up variable */
if ((*i)[0] == '$') {
char *e = strv_env_get(env, *i+1);
if (e) {
char **w, **m;
unsigned q;
if (!(m = strv_split_quoted(e))) {
r[k] = NULL;
strv_free(r);
return NULL;
}
q = strv_length(m);
l = l + q - 1;
if (!(w = realloc(r, sizeof(char*) * (l+1)))) {
r[k] = NULL;
strv_free(r);
strv_free(m);
return NULL;
}
r = w;
memcpy(r + k, m, q * sizeof(char*));
free(m);
k += q;
continue;
}
}
/* If ${FOO} appears as part of a word, replace it by the variable as-is */
if (!(r[k++] = replace_env(*i, env))) {
strv_free(r);
return NULL;

1
units/.gitignore vendored
View File

@ -6,3 +6,4 @@ graphical.target
multi-user.target
getty@.service
remote-fs.target
test-env-replace

2
units/emergency.service
View File

@ -22,4 +22,4 @@ KillMode=process-group
# Bash ignores SIGTERM, so we send SIGHUP first, to ensure that bash
# terminates cleanly.
ExecStop=-/bin/kill -HUP $(MAINPID)
ExecStop=-/bin/kill -HUP ${MAINPID}

2
units/fedora/single.service
View File

@ -25,4 +25,4 @@ KillMode=process-group
# Bash ignores SIGTERM, so we send SIGHUP first, to ensure that bash
# terminates cleanly.
ExecStop=-/bin/kill -HUP $(MAINPID)
ExecStop=-/bin/kill -HUP ${MAINPID}