tree 81080d1577967265cf4e9c4de49857200f693925
parent 3363f6553b3bd196ee51d05c322e395201a49dad
author Jian Zhang <zhangjian.3032@bytedance.com> 1679566690 +0800
committer Jian Zhang <zhangjian.3032@bytedance.com> 1679585057 +0800

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>