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Read environment for init from config file

Signed-off-by: David Oberhollenzer <david.oberhollenzer@tele2.at>
master
David Oberhollenzer 4 years ago
parent
commit
55d4a328c9
  1. 2
      .gitignore
  2. 1
      Makefile.am
  3. 2
      configure.ac
  4. 7
      etc/initd.env.in
  5. 2
      initd/Makemodule.am
  6. 137
      initd/env.c
  7. 10
      initd/init.h

2
.gitignore

@ -41,3 +41,5 @@ services/rootusr
scripts/devfs.sh
scripts/overlay.sh
scripts/trymount.sh
etc/initd.env

1
Makefile.am

@ -5,6 +5,7 @@ AM_CFLAGS = -std=c99 $(WARN_CFLAGS)
sbin_PROGRAMS =
noinst_LIBRARIES =
sysconf_DATA = etc/initd.env
EXTRA_DIST = README LICENSE
helperdir = @SCRIPTDIR@

2
configure.ac

@ -53,6 +53,7 @@ AC_DEFINE_DIR(SOCKDIR, localstatedir/run, [Directory for initd socket])
AC_DEFINE_DIR(BINPATH, bindir, [Fully evaluated bin directory])
AC_DEFINE_DIR(SBINPATH, sbindir, [Fully evaluated sbin directory])
AC_DEFINE_DIR(ETCPATH, sysconfdir, [Fulle evaluated etc directory])
AC_CONFIG_FILES([services/agetty])
AC_CONFIG_FILES([services/hostname])
@ -74,5 +75,6 @@ AC_CONFIG_FILES([services/rootusr])
AC_CONFIG_FILES([scripts/devfs.sh])
AC_CONFIG_FILES([scripts/overlay.sh])
AC_CONFIG_FILES([scripts/trymount.sh])
AC_CONFIG_FILES([etc/initd.env])
AC_OUTPUT([Makefile])

7
etc/initd.env.in

@ -0,0 +1,7 @@
##############################################################################
# initd.env #
# #
# This file contains environment variables that should be set for init. #
##############################################################################
PATH=@BINPATH@:@SBINPATH@

2
initd/Makemodule.am

@ -1,5 +1,5 @@
init_SOURCES = initd/main.c initd/runlst.c initd/init.h
init_SOURCES += initd/status.c initd/mksock.c initd/svclist.c
init_SOURCES += initd/status.c initd/mksock.c initd/svclist.c initd/env.c
init_CPPFLAGS = $(AM_CPPFLAGS)
init_CFLAGS = $(AM_CFLAGS)
init_LDFLAGS = $(AM_LDFLAGS)

137
initd/env.c

@ -0,0 +1,137 @@
/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* Copyright (C) 2018 - David Oberhollenzer
*
* This program 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 3 of the License, or
* (at your option) any later version.
*
* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include "init.h"
#include "util.h"
struct entry {
struct entry *next;
char data[];
};
extern char **environ;
static void free_list(struct entry *list)
{
struct entry *e;
while (list != NULL) {
e = list;
list = list->next;
free(e);
}
}
static struct entry *parse_list(rdline_t *rd)
{
struct entry *e, *list = NULL;
char *ptr;
while (rdline(rd) == 0) {
ptr = rd->buffer;
while (*ptr != '\0' && *ptr != ' ' && *ptr != '=')
++ptr;
if (*ptr == ' ')
memmove(ptr, ptr + 1, strlen(ptr + 1) + 1);
if (*(ptr++) != '=') {
fprintf(stderr, "%s: %zu: line is not of the shape "
"'key = value', skipping\n",
rd->filename, rd->lineno);
continue;
}
if (*ptr == ' ')
memmove(ptr, ptr + 1, strlen(ptr + 1) + 1);
if (unescape(ptr)) {
fprintf(stderr, "%s: %zu: malformed string constant, "
"skipping\n",
rd->filename, rd->lineno);
continue;
}
e = calloc(1, sizeof(*e) + strlen(rd->buffer) + 1);
if (e == NULL)
goto fail_oom;
strcpy(e->data, rd->buffer);
e->next = list;
list = e;
}
return list;
fail_oom:
fputs("out of memory\n", stderr);
free_list(list);
return NULL;
}
static struct entry *list_from_file(void)
{
struct entry *list;
rdline_t rd;
int fd;
fd = open(ENVFILE, O_RDONLY);
if (fd < 0) {
perror(ENVFILE);
return NULL;
}
rdline_init(&rd, fd, ENVFILE, 0, NULL);
list = parse_list(&rd);
close(fd);
return list;
}
int initenv(void)
{
struct entry *list, *e;
int i, count;
char **envp;
list = list_from_file();
if (list == NULL)
return -1;
for (count = 0, e = list; e != NULL; e = e->next)
++count;
envp = malloc((count + 1) * sizeof(char *));
if (envp == NULL) {
fputs("out of memory\n", stderr);
free_list(list);
return -1;
}
for (i = 0, e = list; e != NULL; e = e->next)
envp[i] = e->data;
envp[i] = NULL;
environ = envp;
return 0;
}

10
initd/init.h

@ -25,6 +25,8 @@
#include "telinit.h"
#include "util.h"
#define ENVFILE ETCPATH "/initd.env"
enum {
STATUS_OK = 0,
STATUS_FAIL,
@ -107,5 +109,13 @@ void svclist_add(service_t *svc);
*/
service_t *svclist_remove(pid_t pid);
/********** env.c **********/
/*
Read /etc/initd.env (actually ENVFILE defined above)
and setup environment variables for init.
*/
int initenv(void);
#endif /* INIT_H */

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