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authorLennart Poettering <lennart@poettering.net>2012-01-18 16:39:04 +0100
committerLennart Poettering <lennart@poettering.net>2012-01-18 16:39:04 +0100
commit31ed59c51126fce7d958c188772a397e2a1ed010 (patch)
tree4283457ed50bb46e3cbf86bcc5bb06e1f3479a1a /src/tmpfiles.c
parent88f06645623467f9c8db88afca64557d62e38c61 (diff)
tmpfiles: support writing short strings to files, in order to support /sys manipulations at boot time, a la sysctl
Diffstat (limited to 'src/tmpfiles.c')
-rw-r--r--src/tmpfiles.c70
1 files changed, 62 insertions, 8 deletions
diff --git a/src/tmpfiles.c b/src/tmpfiles.c
index 2096019699..f3c38a8433 100644
--- a/src/tmpfiles.c
+++ b/src/tmpfiles.c
@@ -54,6 +54,7 @@ typedef enum ItemType {
/* These ones take file names */
CREATE_FILE = 'f',
TRUNCATE_FILE = 'F',
+ WRITE_FILE = 'w',
CREATE_DIRECTORY = 'd',
TRUNCATE_DIRECTORY = 'D',
CREATE_FIFO = 'p',
@@ -574,19 +575,48 @@ static int create_item(Item *i) {
return 0;
case CREATE_FILE:
- case TRUNCATE_FILE: {
- int fd;
+ case TRUNCATE_FILE:
+ case WRITE_FILE: {
+ int fd, flags;
+
+ flags = i->type == CREATE_FILE ? O_CREAT|O_APPEND :
+ i->type == TRUNCATE_FILE ? O_CREAT|O_TRUNC : 0;
u = umask(0);
- fd = open(i->path, O_CREAT|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW|
- (i->type == TRUNCATE_FILE ? O_TRUNC : 0), i->mode);
+ fd = open(i->path, flags|O_NDELAY|O_CLOEXEC|O_WRONLY|O_NOCTTY|O_NOFOLLOW, i->mode);
umask(u);
if (fd < 0) {
+ if (i->type == WRITE_FILE && errno == ENOENT)
+ break;
+
log_error("Failed to create file %s: %m", i->path);
return -errno;
}
+ if (i->argument) {
+ ssize_t n;
+ size_t l;
+ struct iovec iovec[2];
+ static const char new_line = '\n';
+
+ l = strlen(i->argument);
+
+ zero(iovec);
+ iovec[0].iov_base = i->argument;
+ iovec[0].iov_len = l;
+
+ iovec[1].iov_base = (void*) &new_line;
+ iovec[1].iov_len = 1;
+
+ n = writev(fd, iovec, 2);
+ if (n < 0 || (size_t) n != l+1) {
+ log_error("Failed to write file %s: %s", i->path, n < 0 ? strerror(-n) : "Short");
+ close_nointr_nofail(fd);
+ return n < 0 ? n : -EIO;
+ }
+ }
+
close_nointr_nofail(fd);
if (stat(i->path, &st) < 0) {
@@ -752,6 +782,7 @@ static int remove_item_instance(Item *i, const char *instance) {
case IGNORE_PATH:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
+ case WRITE_FILE:
break;
case REMOVE_PATH:
@@ -793,6 +824,7 @@ static int remove_item(Item *i) {
case IGNORE_PATH:
case RELABEL_PATH:
case RECURSIVE_RELABEL_PATH:
+ case WRITE_FILE:
break;
case REMOVE_PATH:
@@ -857,7 +889,10 @@ static bool item_equal(Item *a, Item *b) {
(a->age_set && a->age != b->age))
return false;
- if (a->type == CREATE_SYMLINK &&
+ if ((a->type == CREATE_FILE ||
+ a->type == TRUNCATE_FILE ||
+ a->type == WRITE_FILE ||
+ a->type == CREATE_SYMLINK) &&
!streq(a->argument, b->argument))
return false;
@@ -874,7 +909,7 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
char *mode = NULL, *user = NULL, *group = NULL, *age = NULL;
char type;
Hashmap *h;
- int r;
+ int r, n = -1;
assert(fname);
assert(line >= 1);
@@ -893,19 +928,30 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
"%ms "
"%ms "
"%ms "
- "%ms",
+ "%n",
&type,
&i->path,
&mode,
&user,
&group,
&age,
- &i->argument) < 2) {
+ &n) < 2) {
log_error("[%s:%u] Syntax error.", fname, line);
r = -EIO;
goto finish;
}
+ if (n >= 0) {
+ n += strspn(buffer+n, WHITESPACE);
+ if (buffer[n] != 0 && (buffer[n] != '-' || buffer[n+1] != 0)) {
+ i->argument = unquote(buffer+n, "\"");
+ if (!i->argument) {
+ log_error("Out of memory");
+ return -ENOMEM;
+ }
+ }
+ }
+
switch(type) {
case CREATE_FILE:
@@ -928,6 +974,14 @@ static int parse_line(const char *fname, unsigned line, const char *buffer) {
}
break;
+ case WRITE_FILE:
+ if (!i->argument) {
+ log_error("[%s:%u] Write file requires argument.", fname, line);
+ r = -EBADMSG;
+ goto finish;
+ }
+ break;
+
case CREATE_CHAR_DEVICE:
case CREATE_BLOCK_DEVICE: {
unsigned major, minor;