https://bugzilla.mindrot.org/show_bug.cgi?id=3504
Bug ID: 3504
Summary: file content lost after scp to same file at localhost
Product: Portable OpenSSH
Version: 8.7p1
Hardware: amd64
OS: Linux
Status: NEW
Severity: major
Priority: P5
Component: scp
Assignee: [email protected]
Reporter: [email protected]
It looks like that when scp is using the SFTP protocol (the default
now), the following use case doesn't work anymore.
Reproducer:
$ echo bar > /tmp/foo
$ cat /tmp/foo
bar
$ scp /tmp/foo localhost:/tmp/foo
foo
0% 0 0.0KB/s --:-- ETA
Then, data in /tmp/foo is lost:
$ cat /tmp/foo
$
It looks like sftp opens the destination file with O_TRUNC which is
different than with the legacy SCP, which works as expected:
$ echo bar > /tmp/foo
$ scp -O /tmp/foo localhost:/tmp/foo
foo
100% 4 2.6KB/s 00:00
$ cat /tmp/foo
bar
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