Andreas, Thank you for all your help! Best regards, George... On Tue, Mar 9, 2021 at 12:37 AM Andreas Dilger <adilger@xxxxxxxxx> wrote: > > On Mar 8, 2021, at 2:40 PM, Theodore Ts'o <tytso@xxxxxxx> wrote: > > > > On Mon, Mar 08, 2021 at 12:01:46PM -0800, George Goffe wrote: > >> Howdy, > >> > >> I'm helping to shoot a bug on a Fedora Core 35 system and have been > >> requested to provide a meta-data dump of the problem filesystem. The > >> filenames are restricted so I need to scrub this file before sending > >> it. > >> > >> Does ext4 have a facility whereby I can scrub the filenames from the dump? > > > > Yes, please see the following excerpt from the e2image man page: > > > > This will only send the metadata information, without any data > > blocks. However, the filenames in the directory blocks can still > > reveal information about the contents of the filesystem that the > > bug reporter may wish to keep confidential. To address this > > concern, the -s option can be specified. This will cause e2image > > to scramble directory entries and zero out any unused portions of > > the directory blocks before writing the image file. However, the > > -s option will prevent analysis of problems related to hash-tree > > indexed directories. > > I had actually looked for this option in the e2image man page in order > to reply to this email, but I couldn't find it and wondered if I had > mis-remembered the existence of this functionality. > > I've pushed a patch that reorganizes the e2image man page to list all > of the options explicitly in a separate OPTIONS section, rather than > putting them inline in the text, which makes it hard to find them. > > Cheers, Andreas > > > The -s option can be used with the -r and -Q options to e2image, for > > creating raw and qcow2 image dumps, respectively. Because the > > filenames have been scrambled, this will invalidate the hash-tree > > indexes for the directory, so e2fsck will complain about this. But > > for some kinds of corruption, the -s option can provide data when the > > customer would otherwise not be willing to provide a metadata-only > > dump of the file system. > > > > Hope this helps, > > > > - Ted > > > Cheers, Andreas > > > > > -- It's not what you know that hurts you, it's what you KNOW that AINT so. WIll Rodgers
