ostree/man/ostree.repo-config.xml

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<refentry id="ostree.repo-config">

  <refentryinfo>
    <title>ostree.repo-config</title>
    <productname>OSTree</productname>

    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Colin</firstname>
        <surname>Walters</surname>
        <email>walters@verbum.org</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>ostree.repo-config</refentrytitle>
    <manvolnum>5</manvolnum>
  </refmeta>

  <refnamediv>
    <refname>ostree.repo-config</refname>
    <refpurpose>OSTree repository configuration</refpurpose>
  </refnamediv>

  <refsect1>
    <title>Description</title>

    <para>
      The <filename>config</filename> file in an OSTree
      repository is a "keyfile" in the <ulink
      url="http://standards.freedesktop.org/desktop-entry-spec/latest/">XDG
      Desktop Entry Specification</ulink> format.  It has
      several global flags, as well as zero or more remote
      entries which describe how to access remote
      repositories.
    </para>
    
    <para>
      See <citerefentry><refentrytitle>ostree.repo</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information
      about OSTree repositories.
    </para>
  </refsect1>

  <refsect1>
    <title>[core] Section Options</title>

    <para>
      Repository-global options.  The following entries are defined:
    </para>

    <variablelist>
      <varlistentry>
        <term><varname>mode</varname></term>
        <listitem><para>One of <literal>bare</literal>, <literal>bare-user</literal>, <literal>bare-user-only</literal>, or <literal>archive-z2</literal> (note that <literal>archive</literal> is used everywhere else.)</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>repo_version</varname></term>
        <listitem><para>Currently, this must be set to <literal>1</literal>.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>auto-update-summary</varname></term>
        <listitem><para>Boolean value controlling whether or not to
        automatically update the summary file after any ref is added,
        removed, or updated. Other modifications which may render a
        summary file stale (like static deltas, or collection IDs) do
        not currently trigger an auto-update.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>commit-update-summary</varname></term>
        <listitem><para>This option is deprecated. Use
        <literal>auto-update-summary</literal> instead, for which this
        option is now an alias.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>fsync</varname></term>
        <listitem><para>Boolean value controlling whether or not to
        ensure files are on stable storage when performing operations
        such as commits, pulls, and checkouts.  Defaults to
        <literal>true</literal>.</para>
        <para>
          If you disable fsync, OSTree will no longer be robust
          against kernel crashes or power loss.
        </para>
        <para>
          You might choose to disable this for local development
          repositories, under the assumption they can be recreated from
          source.  Similarly, you could disable for a mirror where you could
          re-pull.
        </para>
        <para>
          For the system repository, you might choose to disable fsync
          if you have uninterruptable power supplies and a well tested
          kernel.
        </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>per-object-fsync</varname></term>
        <listitem><para>By default, OSTree will batch fsync() after
        writing everything; however, this can cause latency spikes
        for other processes which are also invoking fsync().
        Turn on this boolean to reduce potential latency spikes,
        at the cost of slowing down OSTree updates.  You most
        likely want this on by default for "background" OS updates.
        </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>min-free-space-percent</varname></term>
        <listitem>
          <para>
            Integer percentage value (0-99) that specifies a minimum percentage
            of total space (in blocks) in the underlying filesystem to keep
            free. The default value is 3, which is enforced when neither this
            option nor <varname>min-free-space-size</varname> are set.
          </para>
          <para>
            If <varname>min-free-space-size</varname> is set to a non-zero
            value, <varname>min-free-space-percent</varname> is ignored. Note
            that, <varname>min-free-space-percent</varname> is not enforced on
            metadata objects. It is assumed that metadata objects are relatively
            small in size compared to content objects and thus kept outside the
            scope of this option.
          </para>
        </listitem>
      </varlistentry>

     <varlistentry>
        <term><varname>min-free-space-size</varname></term>
        <listitem>
          <para>
            Value (in power-of-2 MB, GB or TB) that specifies a minimum space
            in the underlying filesystem to keep free. Examples of acceptable
            values: <literal>500MB</literal> (524 288 000 bytes),
            <literal>1GB</literal> (1 073 741 824 bytes),
            <literal>1TB</literal> (1 099 511 627 776 bytes).
          </para>
          <para>
            If this option is set to a non-zero value, and
            <varname>min-free-space-percent</varname> is also set, this option
            takes priority. Note that, <varname>min-free-space-size</varname> is
            not enforced on metadata objects. It is assumed that metadata objects
            are relatively small in size compared to content objects and thus kept
            outside the scope of this option.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>add-remotes-config-dir</varname></term>
        <listitem>
          <para>
            Boolean value controlling whether new remotes will be added
            in the remotes configuration directory. Defaults to
            <literal>true</literal> for system ostree repositories. When
            this is <literal>false</literal>, remotes will be added in
            the repository's <filename>config</filename> file.
          </para>
          <para>
            This only applies to repositories that use a remotes
            configuration directory such as system ostree repositories,
            which use <filename>/etc/ostree/remotes.d</filename>.
            Non-system repositories do not use a remotes configuration
            directory unless one is specified when the repository is
            opened.
          </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>payload-link-threshold</varname></term>
        <listitem><para>An integer value that specifies a minimum file size for creating
        a payload link.  By default it is disabled.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>collection-id</varname></term>
        <listitem><para>A reverse DNS domain name under your control, which enables peer
        to peer distribution of refs in this repository. See the
        <literal>--collection-id</literal> section in
        <citerefentry><refentrytitle>ostree-init</refentrytitle><manvolnum>1</manvolnum></citerefentry>
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>locking</varname></term>
        <listitem><para>Boolean value controlling whether or not OSTree does
        repository locking internally. This uses file locks and is
        hence for multiple process exclusion (e.g. Flatpak and OSTree
        writing to the same repository separately). This is enabled by
        default since 2018.5.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>lock-timeout-secs</varname></term>
        <listitem><para>Integer value controlling the number of seconds to
        block while attempting to acquire a lock (see above). A value
        of -1 means block indefinitely. The default value is 300.  This timeout
        is now regarded as a mistake; because it's likely to cause flakes.
        It's recommended to set it to -1, and have timeouts at a higher application
        level if desired.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>default-repo-finders</varname></term>
        <listitem><para>Semicolon separated default list of finders (sources
        for refs) to use when pulling. This can be used to disable
        pulling from mounted filesystems, peers on the local network,
        or the Internet. However note that it only applies when a set
        of finders isn't explicitly specified, either by a consumer of
        libostree API or on the command line. Possible values:
        <literal>config</literal>, <literal>lan</literal>, and
        <literal>mount</literal> (or any combination thereof). If unset, this
        defaults to <literal>config;mount;</literal> (since the LAN finder is
        costly).
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>no-deltas-in-summary</varname></term>
        <listitem><para>Boolean value controlling whether OSTree should skip
        putting an index of available deltas in the summary file. Defaults to false.
        </para>
        <para>
        Since 2020.7 OSTree can use delta indexes outside the summary file,
        making the summary file smaller (especially for larger repositories). However
        by default we still create the index in the summary file to make older clients
        work. If you know all clients will be 2020.7 later you can enable this to
        save network bandwidth.
        </para></listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>[remote "name"] Section Options</title>
    
    <para>
      Describes a remote repository location.
    </para>

    <variablelist>
      <varlistentry>
        <term><varname>url</varname></term>
        <listitem><para>Must be present; declares URL for accessing metadata and
        content for remote. See also <literal>contenturl</literal>. The
        supported schemes are documented below.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>contenturl</varname></term>
        <listitem><para>Declares URL for accessing content (filez, static delta
        parts). When specified, <literal>url</literal> is used just for
        metadata: summary, static delta "superblocks".</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>branches</varname></term>
        <listitem><para>A list of strings. Represents the default configured
        branches to fetch from the remote when no specific branches are
        requested during a pull operation.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>proxy</varname></term>
        <listitem><para>A string value, if given should be a URL for a
        HTTP proxy to use for access to this repository.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>gpg-verify</varname></term>
        <listitem><para>A boolean value, defaults to true.
        Controls whether or not OSTree will require commits to be
        signed by a known GPG key.  For more information, see the
        <citerefentry><refentrytitle>ostree</refentrytitle><manvolnum>1</manvolnum></citerefentry>
        manual under GPG.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>gpg-verify-summary</varname></term>
        <listitem><para>A boolean value, defaults to false.
        Controls whether or not OSTree will check if the summary
        is signed by a known GPG key.
        For more information, see the <citerefentry><refentrytitle>ostree</refentrytitle><manvolnum>1</manvolnum></citerefentry>
        manual under GPG.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>tls-permissive</varname></term>
        <listitem><para>A boolean value, defaults to false.  By
        default, server TLS certificates will be checked against the
        system certificate store.  If this variable is set, any
        certificate will be accepted.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>tls-client-cert-path</varname></term>
        <listitem><para>Path to file for client-side certificate, to present when making requests to this repository.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>tls-client-key-path</varname></term>
        <listitem><para>Path to file containing client-side certificate key, to present when making requests to this repository.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>tls-ca-path</varname></term>
        <listitem><para>Path to file containing trusted anchors instead of the system CA database.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>http2</varname></term>
        <listitem><para>A boolean value, defaults to true.  By
        default, libostree will use HTTP2; setting this to <literal>false</literal>
        will disable it.  May be useful to work around broken servers.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>unconfigured-state</varname></term>
        <listitem><para>If set, pulls from this remote will fail with the configured text.  This is intended for OS vendors which have a subscription process to access content.</para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>custom-backend</varname></term>
        <listitem><para>If set, pulls from this remote via libostree will fail with an error that mentions the value.
                        It is recommended to make this a software identifier token (e.g. "examplecorp-fetcher"), not freeform text ("ExampleCorp Fetcher").
                        This is intended to be used by higher level software that wants to fetch ostree commits via some other mechanism, while still reusing the core libostree infrastructure around e.g. signatures.
                        </para></listitem>
      </varlistentry>

    </variablelist>

  </refsect1>

  <refsect1>
    <title>[sysroot] Section Options</title>

    <para>
      Options for the sysroot, which contains the OSTree repository,
      deployments, and stateroots.  The following entries are defined:
    </para>

    <variablelist>

      <varlistentry>
        <term><varname>readonly</varname></term>
        <listitem><para>A boolean value. If this is set to <literal>true</literal>, then the
        <literal>/sysroot</literal> mount point is mounted read-only. This is configured a
        legacy repository configuration and the equivalent option in <literal>ostree/prepare-root.conf</literal>
        should be used instead - see <citerefentry><refentrytitle>ostree-prepare-root</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
        </para></listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>bootloader</varname></term>
        <listitem><para>Configure the bootloader that OSTree uses when
        deploying the sysroot.  This may take the values
        <literal>bootloader=none</literal>, <literal>bootloader=auto</literal>,
        <literal>bootloader=grub2</literal>, <literal>bootloader=syslinux</literal>,
        <literal>bootloader=uboot</literal> or <literal>bootloader=zipl</literal>.
        Default is <literal>auto</literal>.
        </para>
        <para>
          If <literal>none</literal>, then OSTree will generate only BLS (Boot
          Loader Specification) fragments in <literal>sysroot/boot/loader/entries/</literal>
          for the deployment.
        </para>
        <para>
          If <literal>auto</literal>, then in addition to generating BLS
          fragments, OSTree will dynamically check for the existence of grub2,
          uboot, and syslinux bootloaders.  If one of the bootloaders is found,
          then OSTree will generate a config for the bootloader found.  For
          example, <literal>grub2-mkconfig</literal> is run for the grub2 case.
        </para>
        <para>
          A specific bootloader type may also be explicitly requested by choosing
          <literal>grub2</literal>, <literal>syslinux</literal>, <literal>uboot</literal> or
          <literal>zipl</literal>.
        </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>bls-append-except-default</varname></term>
        <listitem><para>A semicolon separated string list of key-value pairs. For example:
        <literal>bls-append-except-default=key1=value1;key2=value2</literal>. These key-value 
        pairs will be injected into the generated BLS fragments of the non-default deployments.
        In other words, the BLS fragment of the default deployment will be unaffected by
        <literal>bls-append-except-default</literal>.
        </para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><varname>bootprefix</varname></term>
        <listitem><para>A boolean value; defaults to false.  If set to true, the bootloader entries
        generated will include <literal>/boot</literal> as a prefix.  This will likely be turned
        on by default in the future.
        </para>
        </listitem>
      </varlistentry>

    </variablelist>
  </refsect1>

  <refsect1>
    <title>[ex-integrity] Section Options</title>

    <para>
      The "ex-" prefix here signifies experimental options.  The <literal>ex-integrity</literal> section
      contains options related to system integrity.  Information about experimental
      options is canonically found in upstream tracking issues.
    </para>
  </refsect1>

  <refsect1>
    <title>/etc/ostree/remotes.d</title>

    <para>
      In addition to the <filename>/ostree/repo/config</filename>
      file, remotes may also be specified in
      <filename>/etc/ostree/remotes.d</filename>.  The remote
      configuration file must end in <literal>.conf</literal>; files
      whose name does not end in <literal>.conf</literal> will be
      ignored.
    </para>
  </refsect1>

  <refsect1>
    <title>Repository url/contenturl</title>
    <para>
      Originally, OSTree had just a <literal>url</literal> option
      for remotes.  Since then, the <literal>contenturl</literal>
      option was introduced.  Both of these support 
      <literal>file</literal>, <literal>http</literal>, and
      <literal>https</literal> schemes.
    </para>
    <para>
      Additionally, both of these can be prefixed with the string
      <literal>mirrorlist=</literal>, which instructs the client
      that the target url is a "mirrorlist" format, which is
      a plain text file of newline-separated URLs.  Earlier
      URLs will be given precedence.
    </para>
    <para>
      Note that currently, the <literal>tls-ca-path</literal> and
      <literal>tls-client-cert-path</literal> options apply to every HTTP
      request, even when <literal>contenturl</literal> and/or
      <literal>mirrorlist</literal> are in use. This may change in the future to
      only apply to metadata (i.e. <literal>url</literal>, not
      <literal>contenturl</literal>) fetches.
    </para>
  </refsect1>

  <refsect1>
    <title>Per-remote GPG keyrings and verification</title>
    <para>
      OSTree supports a per-remote GPG keyring, as well as a
      <literal>gpgkeypath</literal> option.  For more information see
      <citerefentry><refentrytitle>ostree</refentrytitle><manvolnum>1</manvolnum></citerefentry>.
      in the section <literal>GPG verification</literal>.
    </para>
  </refsect1>

  <refsect1>
    <title>Per-remote HTTP cookies</title>
    <para>
      Some content providers may want to control access to remote
      repositories via HTTP cookies.  The <command>ostree remote
      add-cookie</command> and <command>ostree remote
      delete-cookie</command> commands will update a per-remote
      lookaside cookie jar, named
      <filename>$remotename.cookies.txt</filename>.
    </para>
  </refsect1>
  
  <refsect1>
    <title>See Also</title>
    <para>
      <citerefentry><refentrytitle>ostree</refentrytitle><manvolnum>1</manvolnum></citerefentry>, <citerefentry><refentrytitle>ostree.repo</refentrytitle><manvolnum>5</manvolnum></citerefentry>
    </para>
  </refsect1>
</refentry>