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fileio: add new flag WRITE_STRING_FILE_MODE_0444

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With this write_string_file() will create the file with 0444 access mode
(i.e. read-only).
This commit is contained in:
Lennart Poettering
2024-01-05 17:30:41 +01:00
parent 3289aba5a0
commit 2148c669d2
2 changed files with 17 additions and 3 deletions
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src/basic/fileio.c
+15 -2
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@@ -200,6 +200,19 @@ int write_string_stream_ts(
return 0;
}
static mode_t write_string_file_flags_to_mode(WriteStringFileFlags flags) {
/* We support three different modes, that are the ones that really make sense for text files like this:
*
* → 0600 (i.e. root-only)
* → 0444 (i.e. read-only)
* → 0644 (i.e. writable for root, readable for everyone else)
*/
return FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 :
FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0444) ? 0444 : 0644;
}
static int write_string_file_atomic_at(
int dir_fd,
const char *fn,
@@ -225,7 +238,7 @@ static int write_string_file_atomic_at(
if (r < 0)
goto fail;
r = fchmod_umask(fileno(f), FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 : 0644);
r = fchmod_umask(fileno(f), write_string_file_flags_to_mode(flags));
if (r < 0)
goto fail;
@@ -288,7 +301,7 @@ int write_string_file_ts_at(
(FLAGS_SET(flags, WRITE_STRING_FILE_CREATE) ? O_CREAT : 0) |
(FLAGS_SET(flags, WRITE_STRING_FILE_TRUNCATE) ? O_TRUNC : 0) |
(FLAGS_SET(flags, WRITE_STRING_FILE_SUPPRESS_REDUNDANT_VIRTUAL) ? O_RDWR : O_WRONLY),
(FLAGS_SET(flags, WRITE_STRING_FILE_MODE_0600) ? 0600 : 0666));
write_string_file_flags_to_mode(flags));
if (fd < 0) {
r = -errno;
goto fail;