215 lines
8.4 KiB
XML
215 lines
8.4 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="emrootfslib">
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<refentryinfo>
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<productname>emrootfslib</productname>
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<productnumber/>
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</refentryinfo>
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<refmeta>
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<refentrytitle>emrootfslib</refentrytitle>
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<manvolnum>3</manvolnum>
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<refmiscinfo class="source">EMDEBIAN-ROOTFS</refmiscinfo>
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<refmiscinfo class="manual">EMDEBIAN-ROOTFS</refmiscinfo>
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</refmeta>
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<refnamediv id="name">
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<refname>emrootfslib</refname>
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<refpurpose>Common functions for Emdebian root filesystems</refpurpose>
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</refnamediv>
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<refsect1 id="description">
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<title>DESCRIPTION</title>
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<para><emphasis>emrootfslib</emphasis> is intended solely for use on
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the build machine. Do not use these functions in second_stage_install !
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<emphasis>emrootfslib</emphasis> requires <emphasis role="bold">perl</emphasis>!
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</para>
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<para>There should be no need to call pbuilder code within scripts that
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generate a root filesystem and bash code must not be used in
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<emphasis>emrootfslib</emphasis>.</para>
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</refsect1>
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<refsect1 id="basic_etc_fstab">
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<title>basic_etc_fstab</title>
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<para>Removing packages from the normal Debian debootstrap set can
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mean that certain critical files can be omitted. basic_etc_fstab
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creates a basic version of $TARGET/etc/fstab where it does not
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already exist.
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</para>
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</refsect1>
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<refsect1 id="basic_group_setup">
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<title>basic_group_setup</title>
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<para>Removing packages from the normal Debian debootstrap set can
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mean that certain critical files can be omitted. basic_group_setup
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creates a basic version of $TARGET/etc/group where it does not
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already exist.
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</para>
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</refsect1>
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<refsect1 id="basic_passwd_setup">
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<title>basic_passwd_setup</title>
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<para>Removing packages from the normal Debian debootstrap set can
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mean that certain critical files can be omitted. basic_passwd_setup
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creates a basic version of $TARGET/etc/passwd where it does not
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already exist.
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</para>
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</refsect1>
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<refsect1 id="busybox_inittab">
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<title>busybox_inittab</title>
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<para>Note: this function overwrites an existing $TARGET/etc/inittab
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</para>
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<para>busybox does not support runlevels and so the /etc/inittab
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file needs to be modified to support busybox. Currently, this function
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overwrites an existing $TARGET/etc/inittab - this is likely to change
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in future versions.
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</para>
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</refsect1>
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<refsect1 id="busybox_rcS">
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<title>busybox_rcS</title>
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<para>Note: this function overwrites an existing $TARGET/etc/init.d/rcS
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</para>
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<para>busybox does not support runlevels and so the /etc/init.d/rcS
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script needs to be modified to support busybox. Currently, this function
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overwrites an existing $TARGET/etc/init.d/rcS - this is likely to change
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in future versions.
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</para>
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</refsect1>
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<refsect1 id="check_dirs">
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<title>check_dirs</title>
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<para>Check that the $BUILDPLACE, $BUILDRESULT and $APTCACHE directories
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exist (used by empdebuild).</para>
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</refsect1>
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<refsect1 id="checkarch">
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<title>checkarch</title>
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<para>Calls check_arch from Debian::DpkgCross using perl.
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The perl call dies if the specified string does not match a
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supported architecture.</para>
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</refsect1>
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<refsect1 id="create_emdebiantgz">
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<title>create_emdebiantgz</title>
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<para>Modified version of the equivalent function in pbuilder-modules
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to extract the compressed chroot (used by empdebuild).</para>
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</refsect1>
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<refsect1 id="disable_apt_recommends">
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<title>disable_apt_recommends</title>
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<para>Enforces a default of not installing recommended packages inside the
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chroot.
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</para>
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</refsect1>
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<refsect1 id="extra_etc_rcd">
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<title>extra_etc_rcd</title>
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<para>Removing packages from the normal Debian debootstrap set can
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mean that certain critical files can be omitted. extra_etc_rcd
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creates a basic version of $TARGET/etc/rcS.d where it does not
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already exist.
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</para>
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</refsect1>
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<refsect1 id="make_dpkg_dirs">
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<title>make_dpkg_dirs</title>
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<para>Prepare for unpacking and general dpkg work by setting up
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$TARGET/var/lib/dpkg/status and $TARGET/var/lib/dpkg/available.
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</para>
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</refsect1>
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<refsect1 id="prepare_proc">
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<title>prepare_proc</title>
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<para>Ensure that $TARGET/proc and $TARGET/sys exist so that
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proc and sys can be mounted automatically.
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</para>
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</refsect1>
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<refsect1 id="prepare_var">
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<title>prepare_var</title>
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<para>Ensure that $TARGET/var/log/ and $TARGET/var/spool exist so
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that various installation routines can proceed.
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</para>
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</refsect1>
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<refsect1 id="set_approx_time">
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<title>set_approx_time</title>
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<para>Normal Debian installations have a network connection and
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typical Debian desktop boxes also have a backup battery. Some
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embedded machines do not have either of these systems, making
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it impossible to store or retrieve even a vaguely close indication
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of the current time.
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</para>
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<para>set_approx_time uses the systems available on the build
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machine to store an approximate indication of the time that the
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root filesystem was created and write that time to a file in the
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root filesystem itself. For most purposes, this is sufficient for
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the purposes of setting up the root filesystem to the point where
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a network connection can be created and a call can be made to an
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internet clock using <command>ntpdate-debian</command>.
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</para>
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</refsect1>
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<refsect1 id="set_cdebconf_default">
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<title>set_cdebconf_default</title>
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<para>Adds "export DEBCONF_USE_CDEBCONF=true" to
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$TARGET/etc/profile for cdebconf support.
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</para>
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</refsect1>
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<refsect1 id="symlink_rcS">
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<title>symlink_rcS</title>
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<para>Call repeatedly to create init symlinks, using the template
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$TARGET/etc/rcS.d/S$number$file
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</para>
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<variablelist remap="TP">
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<varlistentry>
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<term>
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<option>file</option>
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</term>
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<listitem>
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<para>file is the filename in $TARGET/etc/init.d/
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<option>number</option>
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</term>
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<listitem>
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<para>number is the number for the link in the init sequence.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="unpack_debootstrap">
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<title>unpack_debootstrap</title>
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<para>Specialized routine that replaces the normal second stage of
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debootstrap (you may consider it a series of hacks if you prefer).
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unpack uses dpkg to extract the files from the .deb package and
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process the control information. Unlike <command>dpkg</command>
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<option>--unpack</option>, the unpack routine does
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<emphasis role="bold">NOT</emphasis> run any maintainer scripts which
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would inevitably fail in a cross built environment.
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Instead, it updates the relevant dpkg status and database files
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in the root filesystem and leaves the package in the unpacked state.
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</para>
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<para>unpack_debootstrap also sets up the busybox applets - future
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versions may split this functionality into a separate function.
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</para>
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<para>unpack_debootstrap also performs checks on /usr/sbin/invoke-rc.d
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and /usr/sbin/update-rc.d - future versions may split this functionality
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into a separate function.
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</para>
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<para>Finally, unpack_debootstrap removes all .deb package files
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from /var/cache/apt/archives. The remaining task (dpkg --configure -a)
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is performed via emsecondstage.</para>
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</refsect1>
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<refsect1 id="x_feign_install">
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<title>x_feign_install</title>
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<para>Copied from debootstrap suite scripts to make a basic
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installation of a .deb package - although this is the basis of
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unpack_debootstrap, it is only really used for dpkg itself.
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</para>
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</refsect1>
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<refsect1>
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<title>Author</title>
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<para><emphasis>empbuilderlib</emphasis> was written
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by Neil Williams <email>codehelp@debian.org</email>.
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</para>
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<para>This manual page was written by Neil Williams
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<email>codehelp@debian.org</email>
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</para>
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</refsect1>
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<refsect1 id="seealso">
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<title>SEE ALSO</title>
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<para>See also <filename>apt-cross</filename> (1),
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<filename>dpkg-cross</filename> (1), <emphasis>emdebian-tools</emphasis> (1),
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<filename>empdebuilderlib</filename> (3).
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</para>
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</refsect1>
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</refentry>
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