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id128: add format which treats "uninitialized" like an empty id

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Add a new ID128_PLAIN_OR_UNINIT format which treats the string
"uninitialized" like the file was empty and return -ENOMEDIUM.  This
format should be used when reading an /etc/machine-id file from an image
that is not currently running.
This commit is contained in:
Harald Seiler 2020-09-06 21:23:36 +02:00
parent 583cef3b73
commit 8085114828
2 changed files with 11 additions and 1 deletions
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8
src/libsystemd/sd-id128/id128-util.c
View File

@ -10,6 +10,7 @@
#include "id128-util.h"
#include "io-util.h"
#include "stdio-util.h"
#include "string-util.h"
char *id128_to_uuid_string(sd_id128_t id, char s[static ID128_UUID_STRING_MAX]) {
unsigned n, k = 0;
@ -97,6 +98,11 @@ int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
switch (l) {
case 13:
case 14:
/* Treat an "uninitialized" id file like an empty one */
return f == ID128_PLAIN_OR_UNINIT && strneq(buffer, "uninitialized\n", l) ? -ENOMEDIUM : -EINVAL;
case 33: /* plain UUID with trailing newline */
if (buffer[32] != '\n')
return -EINVAL;
@ -115,7 +121,7 @@ int id128_read_fd(int fd, Id128Format f, sd_id128_t *ret) {
_fallthrough_;
case 36: /* RFC UUID without trailing newline */
if (f == ID128_PLAIN)
if (IN_SET(f, ID128_PLAIN, ID128_PLAIN_OR_UNINIT))
return -EINVAL;
buffer[36] = 0;

4
src/libsystemd/sd-id128/id128-util.h
View File

@ -17,6 +17,10 @@ bool id128_is_valid(const char *s) _pure_;
typedef enum Id128Format {
ID128_ANY,
ID128_PLAIN, /* formatted as 32 hex chars as-is */
ID128_PLAIN_OR_UNINIT, /* formatted as 32 hex chars as-is; allow special "uninitialized"
* value when reading from file (id128_read() and id128_read_fd()).
*
* This format should be used when reading a machine-id file. */
ID128_UUID, /* formatted as 36 character uuid string */
_ID128_FORMAT_MAX,
} Id128Format;