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time-util: add variant of timezone_is_valid() that returns errno

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This will be useful for tests to skip missing time zones.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek
2021-07-01 10:10:52 +00:00
parent 2f15b35352
commit bdaeafea5d
3 changed files with 34 additions and 26 deletions
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43
src/basic/time-util.c
View File

@@ -1381,7 +1381,7 @@ int get_timezones(char ***ret) {
return 0;
}
bool timezone_is_valid(const char *name, int log_level) {
int verify_timezone(const char *name, int log_level) {
bool slash = false;
const char *p, *t;
_cleanup_close_ int fd = -1;
@@ -1389,26 +1389,26 @@ bool timezone_is_valid(const char *name, int log_level) {
int r;
if (isempty(name))
return false;
return -EINVAL;
/* Always accept "UTC" as valid timezone, since it's the fallback, even if user has no timezones installed. */
if (streq(name, "UTC"))
return true;
return 0;
if (name[0] == '/')
return false;
return -EINVAL;
for (p = name; *p; p++) {
if (!(*p >= '0' && *p <= '9') &&
!(*p >= 'a' && *p <= 'z') &&
!(*p >= 'A' && *p <= 'Z') &&
!IN_SET(*p, '-', '_', '+', '/'))
return false;
return -EINVAL;
if (*p == '/') {
if (slash)
return false;
return -EINVAL;
slash = true;
} else
@@ -1416,38 +1416,31 @@ bool timezone_is_valid(const char *name, int log_level) {
}
if (slash)
return false;
return -EINVAL;
if (p - name >= PATH_MAX)
return false;
return -ENAMETOOLONG;
t = strjoina("/usr/share/zoneinfo/", name);
fd = open(t, O_RDONLY|O_CLOEXEC);
if (fd < 0) {
log_full_errno(log_level, errno, "Failed to open timezone file '%s': %m", t);
return false;
}
if (fd < 0)
return log_full_errno(log_level, errno, "Failed to open timezone file '%s': %m", t);
r = fd_verify_regular(fd);
if (r < 0) {
log_full_errno(log_level, r, "Timezone file '%s' is not a regular file: %m", t);
return false;
}
if (r < 0)
return log_full_errno(log_level, r, "Timezone file '%s' is not a regular file: %m", t);
r = loop_read_exact(fd, buf, 4, false);
if (r < 0) {
log_full_errno(log_level, r, "Failed to read from timezone file '%s': %m", t);
return false;
}
if (r < 0)
return log_full_errno(log_level, r, "Failed to read from timezone file '%s': %m", t);
/* Magic from tzfile(5) */
if (memcmp(buf, "TZif", 4) != 0) {
log_full(log_level, "Timezone file '%s' has wrong magic bytes", t);
return false;
}
if (memcmp(buf, "TZif", 4) != 0)
return log_full_errno(log_level, SYNTHETIC_ERRNO(EIO),
"Timezone file '%s' has wrong magic bytes", t);
return true;
return 0;
}
bool clock_boottime_supported(void) {

5
src/basic/time-util.h
View File

@@ -134,7 +134,10 @@ int parse_time(const char *t, usec_t *usec, usec_t default_unit);
int parse_nsec(const char *t, nsec_t *nsec);
int get_timezones(char ***l);
bool timezone_is_valid(const char *name, int log_level);
int verify_timezone(const char *name, int log_level);
static inline bool timezone_is_valid(const char *name, int log_level) {
return verify_timezone(name, log_level) >= 0;
}
bool clock_boottime_supported(void);
bool clock_supported(clockid_t clock);