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From: | Paul Eggert |
Subject: | bug#60291: chmod a-r does not fail for vfat |
Date: | Fri, 23 Dec 2022 21:59:10 -0800 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2 |
On 12/23/22 17:09, Krzysztof Żelechowski wrote:
chmod a-r a.txt && stat a.txt Expected: chmod: unsupported permissions Got: -r--r--r-- This is wrong because the command chmod had failed to set the permissions
The chmod command is doing the right thing; the problem lies elsewhere. Run "strace chmod a-r a.txt". You should see something like "fchmodat(AT_FDCWD, "a.txt", 0200) = 0" which means chmod told the kernel to change a.txt's permissions to -w------- and the kernel responded that it did so successfully.
The problem here is a squirrelly filesystem. Run "man ntfs-3g" and look for "Access Handling and Security".
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