![]() ![]() And to ensure that the stick will be mounted with ACL support enabled, we need to use tune2fs to adjust the default mount options stored in the filesystem metadata. We need to set a default ACL on the root directory of the USB stick filesystem that assigns full access to everyone on any new file or directory. If you can make sure that your normal user's UID number is the same across all your Linux systems, and you only care about access for that one user (plus root of course), you can get away with just formatting the USB stick to ext4, mounting it for the first time, and assigning the ownership of its root directory to your regular user account before you begin using the filesystem.Īssuming that /dev/sdX1 is the USB stick partition you wish to create the filesystem in, and is your username, you can do this when setting up the USB stick for use: sudo mkfs.ext4 /dev/sdX1īut if you cannot guarantee matching UID/GID numbers, and/or there are multiple users who might want to use the USB stick, you'll need to do something a bit more complicated, but still an one-time operation after creating the ext4 filesystem on the stick. A single mistake could lead you creating an important configuration file with wide-open permissions, that might compromise the security of your user account or cause other more minor problems. and you don't really want to keep changing it to 000 for creating files on the USB stick and back to the default value (usually 002 or 022) for normal use. The problem is, permissions on any new files created are controlled by the umask value. In order to be able to access the stick without needing to adjust permissions, you must make sure any files and directories created on the stick will have non-restrictive permissions automatically. one set of permissions for everyone else.one set of permissions for the group owner, identified by the group's GID number.one set of permissions for the owner, identified by the owner's UID number. ![]() The three classic Unix file permission sets are: ![]() Each file has an owner UID and one group owner GID. That is, the user is identified by an UID number, and each user will belong to one or more groups, each group identified by its GID number. Like any unix-style filesystem, ext4 includes standard Unix file ownership and permission conventions. ![]()
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