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From 6503fbef433da29fe1f450e44c8eaca61888bcda Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Mon, 27 Apr 2015 17:25:57 +0200
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Subject: [PATCH] update-done: ignore nanosecond file timestamp components,
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they are not reliable
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https://bugs.freedesktop.org/show_bug.cgi?id=90192
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(cherry picked from commit 329c542585cd92cb905990e3bf59eda16fd88cfb)
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Cherry-picked from: a38a3e0
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Resolves: #1222517
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---
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src/update-done/update-done.c | 12 +++++++++---
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1 file changed, 9 insertions(+), 3 deletions(-)
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diff --git a/src/update-done/update-done.c b/src/update-done/update-done.c
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index 561963e5eb..cb5cd6f4ab 100644
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--- a/src/update-done/update-done.c
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+++ b/src/update-done/update-done.c
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@@ -36,9 +36,15 @@ static int apply_timestamp(const char *path, struct timespec *ts) {
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assert(ts);
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if (stat(path, &st) >= 0) {
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- /* Is the timestamp file already newer than the OS? If so, there's nothing to do. */
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- if (st.st_mtim.tv_sec > ts->tv_sec ||
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- (st.st_mtim.tv_sec == ts->tv_sec && st.st_mtim.tv_nsec >= ts->tv_nsec))
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+ /* Is the timestamp file already newer than the OS? If
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+ * so, there's nothing to do. We ignore the nanosecond
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+ * component of the timestamp, since some file systems
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+ * do not support any better accuracy than 1s and we
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+ * have no way to identify the accuracy
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+ * available. Most notably ext4 on small disks (where
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+ * 128 byte inodes are used) does not support better
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+ * accuracy than 1s. */
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+ if (st.st_mtim.tv_sec > ts->tv_sec)
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return 0;
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/* It is older? Then let's update it */
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