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update-done: ignore nanosecond file timestamp components, they are not reliable

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https://bugs.freedesktop.org/show_bug.cgi?id=90192
This commit is contained in:
Lennart Poettering 2015-04-27 17:25:57 +02:00
parent 0a2f9085e2
commit 329c542585
Notes: Lennart Poettering 2015-05-21 19:11:59 +02:00 
Backport: bugfix
1 changed files with 9 additions and 3 deletions
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12
src/update-done/update-done.c
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@ -38,9 +38,15 @@ static int apply_timestamp(const char *path, struct timespec *ts) {
assert(ts); assert(ts);
if (stat(path, &st) >= 0) { if (stat(path, &st) >= 0) {
/* Is the timestamp file already newer than the OS? If so, there's nothing to do. */ /* Is the timestamp file already newer than the OS? If
if (st.st_mtim.tv_sec > ts->tv_sec || * so, there's nothing to do. We ignore the nanosecond
(st.st_mtim.tv_sec == ts->tv_sec && st.st_mtim.tv_nsec >= ts->tv_nsec)) * component of the timestamp, since some file systems
* do not support any better accuracy than 1s and we
* have no way to identify the accuracy
* available. Most notably ext4 on small disks (where
* 128 byte inodes are used) does not support better
* accuracy than 1s. */
if (st.st_mtim.tv_sec > ts->tv_sec)
return 0; return 0;
/* It is older? Then let's update it */ /* It is older? Then let's update it */