commit cb4f0ca3462af9c2353f85d3bb4836e7bdb03bdc
author Jian Zhang <zhangjian.3032@bytedance.com> Thu Mar 23 18:18:10 2023 +0800
committer Jian Zhang <zhangjian.3032@bytedance.com> Thu Mar 23 23:24:17 2023 +0800
tree 81080d1577967265cf4e9c4de49857200f693925
parent 3363f6553b3bd196ee51d05c322e395201a49dad

Fix rsync unexpectly skip file

Normally rsync will skip any files that are already the same size and
have the same modification timestamp. Due to this, if 2 modify event
in one file happen in a short time, the second modify event will be
skipped by rsync.

This patch add a new option `-I` (--ignore-times) to rsync, which
sync file forcely even if the file size and modification timestamp
are the same.

Before this patch:
1. Prepare the file `foo`, content is:
```
123
```

2. Modify the file `foo` twice in a short time.
Note: Don't Change the File Size. I use this cpp code to mock.
```
\#include <fstream>
\#include <thread>

int main() {
  std::ofstream file("foo");
  file << "foo";
  file.close();

  std::this_thread::sleep_for(std::chrono::milliseconds(200));

  std::ofstream file1("foo");
  file1 << "bar";
  file1.close();

  return 0;
}
```

3. Check the syncd file, expect the content is `bar`, but the `foo`
was found.

After this patch the the file `foo` is synced always.

Change-Id: I25799319fed93631aa9d20b5b5efdd7391b585e1
Signed-off-by: Jian Zhang <zhangjian.3032@bytedance.com>