ls: Should print timestamp for dates far in the future #8355
Description
Steps to repro (might need to use tmpfs for this, e.g. my local ext4 does not like such large timestamps)
$ touch -d @9223372036854775807 /tmp/future
$ LC_ALL=C TZ=UTC0 ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 9223372036854775807 /tmp/future
$ LC_ALL=C TZ=UTC0 cargo run ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 ??? /tmp/future
The cutoff is at 67768036191676799/67768036191676800 (basically when the year doesn't fit in signed 32-bit anymore, the timezone does play a role here):
touch -d @67768036191676799 /tmp/future && LC_ALL=C TZ=UTC0 ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 Dec 31 2147485547 /tmp/future
touch -d @67768036191676800 /tmp/future && LC_ALL=C TZ=UTC0 ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 67768036191676800 /tmp/future
Also, ls is unhappy about times much less far in the future (and prints ???):
$ touch -d @677680361916 /tmp/future
$ LC_ALL=C TZ=UTC0 cargo run ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 ??? /tmp/future
$ LC_ALL=C TZ=UTC0 ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 Nov 1 23444 /tmp/future
This causes tests/du/bigtime to be skipped:
util/run-gnu-test.sh tests/du/bigtime
bigtime.sh: skipped test: file system or localtime mishandles big timestamps: -rw-r--r-- 1 drinkcat drinkcat 0 May 10 22:38 future
What the code does is:
export LC_ALL=C
export TZ=UTC0
# 2**63 - 1
bignum=9223372036854775807
touch -d @$bignum future 2>/dev/null &&
future_time=$(ls -l future) &&
...
With GNU coreutils, I also hit this issue on my ext4 filesystem:
$ LC_ALL=C TZ=UTC0 touch -d @9223372036854775807 future
$ LC_ALL=C TZ=UTC0 ls -l future
-rw-r--r-- 1 drinkcat drinkcat 0 May 10 2446 future
But tmpfs is fine:
$ LC_ALL=C TZ=UTC0 touch -d @9223372036854775807 /tmp/future
$ LC_ALL=C TZ=UTC0 ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 9223372036854775807 /tmp/future
Back to uutils/coreutils:
$ LC_ALL=C TZ=UTC0 cargo run touch -d @9223372036854775807 /tmp/future
$ LC_ALL=C TZ=UTC0 ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 9223372036854775807 /tmp/future
$ LC_ALL=C TZ=UTC0 cargo run ls -l /tmp/future
-rw-r--r-- 1 drinkcat drinkcat 0 ??? /tmp/future
touch is fine, ls -l is not.