The AbortScript is another function I use. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. If container is running in -read-only mode, then mount a read-write tmpfs on /run, /tmp, and /var/tmp. $ ] & echo "already set to $myvar" || myvar=10 As a matter of fact, you can use this script, which changes the file C:ScriptsTest.vbs from a read-only file to a read-write file: Set objFSO CreateObject(Scripting.FileSystemObject) Set objFile objFSO.GetFile(C:ScriptsTest.vbs) If objFile.Attributes AND ReadOnly Then objFile.Attributes objFile. Welcome to, a friendly and active Linux Community.
If your shell is bash, you can use the -v test: ] || NOTIFY=$(case "$OS" in (macosx) echo macos_notify (linux) echo linux_notify (*) echo : esac) I also tried things along the lines of eval "declare -r $1=$(eval $2)", it feels like eval is required somewhere here but I'm not sure where.Īll of the versions of set_var_once result in not setting the variable they should. The easy options are to remove -r or use set +e for that part of the script.īarring those, is it possible to write a Bash function to take the place of declare -r but not re-assign if the name already exists? Normally declare -r EXISTING_VAR would neither stop the script nor remove the old, working definition of EXISTING_VAR.īut with errexit, assigning to an existing variable is understandably a failure. Workaround: The following workarounds resolve these issues.įor issue 1, run the fsck command on the snapshot volume on the Secondary, to restore the consistency of the file system residing on the snapshot.įor example: # fsck -t vxfs /dev/vx/dsk/ dg/ snapshot_volumeįor issue 2, run the fsck command on the replicated data volumes on the new Primary site, to restore the consistency of the file system residing on the data volume.If I had a script which sets variables read-only to some odd values, and sets errexit because of other unsafe operations: #!/bin/bashĭeclare -r NOTIFY=$(case "$OS" in (macosx) echo macos_notify (linux) echo linux_notify (*) echo : esac)Īnd I source it to get the definitions, the second time because it's in development: $.
The user can always spawn a new shell and change the variable. This is in no way a security feature to prevent the user from changing it. The C variable may also be declared as PyObject. readonly VARfoo POSIX declare -r VARfoo bash export VAR. Some formats require a read-only bytes-like object, and set a pointer instead of a buffer structure. This usually happens because the file system was not quiesced on the original Primary site prior to the global clustering site failover and therefore, the file systems on the new Primary site may not be fully consistent. Readonly variables can be set in POSIX compliant shells using the readonly command. This happens because the file system may not be quiesced before running the vradmin ibc command and therefore, the snapshot volume containing the file system may not be fully consistent.Īfter a global clustering site failover, mounting a replicated data volume containing a VxFS file system on the new Primary site in read-write mode may fail with the following error: UX:vxfs mount: ERROR: V-3-21268: /dev/vx/dsk/ dg/ data_volume In this command the -o flag is for options, the remount option tells mount to remount. The typeset command also works in ksh scripts. This system variables original intention was to.
The declare command is specific to version 2 or later of Bash. Description: If this system variable is set to 1, then temporary tables will be saved to disk intead of memory. Here is how you can remount it with read and write access so that you can make changes to files on it (create new ones and delete others): sudo mount -o remount,rw /. Typing variables: declare or typeset The declare or typeset builtins, which are exact synonyms, permit modifying the properties of variables.This is a very weak form of the typing 1 available in certain programming languages. When the vradmin ibc command is used to take a snapshot of a replicated data volume containing a VxFS file system on the Secondary, mounting the snapshot volume in read-write mode may fail with the following error: UX:vxfs mount: ERROR: V-3-21268: /dev/vx/dsk/ dg/ snapshot_volume where: -f set also the functions corresponding to the names read-only. Sometimes you end up with a storage drive mounted with read-only access in Linux. that all configuration values be treated as read-only variables. A snapshot volume created on the Secondary, containing a VxFS file system may not mount in read-write mode and performing a read-write mount of the VxFS file systems on the new Primary after a global clustering site failover may fail Global variables declared outside of the constructor should be avoided as they provide.