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bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS
From: |
Paul Eggert |
Subject: |
bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS |
Date: |
Fri, 10 Feb 2023 13:50:46 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 |
On 2/10/23 13:35, George Valkov wrote:
Since the source and it’s clone have separate metadata,
it should be possible to change it on the clone, to comply with standards.
Attached is a hacky patch to do that. It also uses the new CLONE_ACL
flag. The old code apparently mishandled ACLs; the new code tries to do
a better job.
This whole area is a mess, but the patch should improve correctness on
macOS, while also being efficient in the usual case.
It feels more natural when the metadata is kept intact for the two files.
That depends on the application. The longstanding tradition for cp is to
preserve metadata if you use 'cp -p', and to not preserve with plain cp.
For interactive use you can use an alias or a little script if you
prefer -p to be enabled by default.
Here is a good example: I create a tarball on my OpenWRT router. Extract on the
Mac.
That's fine, because 'tar' historically has preserved the timestamp and
(if you're root) permissions. Plain cp has not.
I found this link in one of the mailing lists you sent, it explains what was
wrong
with the original SEEK_DATA and SEEK_HOLE approach on macOS
GNU cp does a pass over the file with SEEK_HOLE and SEEK_DATA, so if I
understand things correctly it shouldn't run into the problem mentioned
there.
In other words, that email doesn't appear to explain our current problem.
0001-cp-improve-use-of-fclonefileat.patch
Description: Text Data
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, (continued)
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Paul Eggert, 2023/02/09
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Pádraig Brady, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Pádraig Brady, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Pádraig Brady, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Paul Eggert, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS,
Paul Eggert <=
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Pádraig Brady, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Paul Eggert, 2023/02/11
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/11
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/10
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Paul Eggert, 2023/02/11
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/11
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Paul Eggert, 2023/02/11
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, George Valkov, 2023/02/11
- bug#61386: [PATCH] cp,mv,install: Disable sparse copy on macOS, Pádraig Brady, 2023/02/12