mirror of
https://github.com/ostreedev/ostree.git
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105 lines
3.3 KiB
XML
105 lines
3.3 KiB
XML
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<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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Copyright 2016 Colin Walters <walters@verbum.org>
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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-->
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<refentry id="ostree">
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<refentryinfo>
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<title>rofiles-fuse</title>
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<productname>rofiles-fuse</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Colin</firstname>
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<surname>Walters</surname>
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<email>walters@verbum.org</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>rofiles-fuse</refentrytitle>
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<manvolnum>1</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>rofiles-fuse</refname>
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<refpurpose>Use FUSE to create a view where directories are writable, files are immutable</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>rofiles-fuse SRCDIR MNTPOINT</command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para>
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Creating a checkout from an OSTree repository by default
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uses hard links, which means an in-place mutation to any
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file corrupts the repository and all checkouts. This can be
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problematic if one wishes to run arbitrary programs against
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such a checkout. For example, RPM <literal>%post</literal>
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scripts or equivalent.
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</para>
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<para>
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In the case where one wants to create a tree commit derived
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from other content, using <command>rofiles-fuse</command> in
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concert with <command>ostree commit
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--link-checkout-speedup</command> (or the underlying API)
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can ensure that only new files are checksummed.
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</para>
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</refsect1>
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<refsect1>
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<title>Example: Update an OSTree commit</title>
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<programlisting>
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# Initialize a checkout and mount
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$ ostree --repo=repo checkout somebranch branch-checkout
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$ mkdir mnt
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$ rofiles-fuse branch-checkout mnt
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# Now, arbitrary changes to mnt/ are reflected in branch-checkout
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$ echo somenewcontent > mnt/anewfile
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$ mkdir mnt/anewdir
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$ rm mnt/someoriginalcontent -rf
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# Commit and cleanup
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$ fusermount -u mnt
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$ ostree --repo=repo commit --link-checkout-speedup -b somebranch -s 'Commit new content' --tree=dir=branch-checkout
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$ rm mnt branch-checkout -rf
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</programlisting>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>ostree</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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