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<h1 id="nfsopenhack">nfsopenhack</h1><ul><li><code>nfsopenhack=off</code>: No hack applied.</li><li><code>nfsopenhack=git</code>: Apply hack if path includes <code>/.git/</code>.</li><li><code>nfsopenhack=all</code>: Apply hack on all empty read-only files opened for writing.</li><li>Defaults to <code>off</code>.</li></ul><p>NFS is not fully POSIX compliant and historically certain behaviors,such as opening files with <code>O_EXCL</code>, are not or not wellsupported. When mergerfs (or any FUSE filesystem) is exported over NFSsome of these issues come up due to how NFS and FUSE interact.</p><p>This hack addresses the issue where the creation of a file with aread-only mode but with a read/write or write only flag. Normally thisis perfectly valid but NFS chops the one open call into multiplecalls. Exactly how it is translated depends on the configuration andversions of the NFS server and clients but it results in a permissionerror because a normal user is not allowed to open a read-only file aswritable.</p><p>Even though it's a more niche situation this hack breaks normalsecurity and behavior and as such is <code>off</code> by default. If set to <code>git</code>it will only perform the hack when the path in question includes<code>/.git/</code>. <code>all</code> will result in it applying anytime a read-only filewhich is empty is opened for writing.</p>
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