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/usr/bin/git-pbuilder is in git-buildpackage 0.8.12.2.

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The actual contents of the file can be viewed below.

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#!/bin/bash
# $Id: git-pbuilder,v 1.43 2016/12/10 18:54:05 eagle Exp $
#
# Wrapper around pbuilder for gbp buildpackage
#
# Note that this script requires bash, not a POSIX shell, because it uses bash
# arrays to handle GIT_PBUILDER_OPTIONS and GIT_PBUILDER_PDEBUILDOPTIONS.
# It's otherwise quite difficult to get the contents of that environment
# variable to undergo the correct amount of shell expansion.
#
# Written by Russ Allbery <eagle@eyrie.org>
# Based on the example in the git-buildpackage documentation
# Copyright 2014, 2015, 2016 Russ Allbery <eagle@eyrie.org>
# Copyright 2008, 2009, 2010, 2011, 2012, 2013
#     The Board of Trustees of the Leland Stanford Junior University
#
# Permission to use, copy, modify, and distribute this software and its
# documentation for any purpose and without fee is hereby granted, provided
# that the above copyright notice appear in all copies and that both that
# copyright notice and this permission notice appear in supporting
# documentation, and that the name of Stanford University not be used in
# advertising or publicity pertaining to distribution of the software without
# specific, written prior permission.  Stanford University makes no
# representations about the suitability of this software for any purpose.  It
# is provided "as is" without express or implied warranty.
#
# THIS SOFTWARE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
# WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

set -e

# Helper function to quote an argument so that it's protected from the shell.
# This is used when passing arguments through in --debbuildopts, since they'll
# undergo another round of shell expansion.
shell_quote () {
    echo "$1" | sed -e "s/'/'\"'\"'/g" -e "1 s/^/'/" -e "\$ s/\$/'/"
}

# Set default BUILDER, DIST, and ARCH based on the name we were invoked as.
# This allows people to create symlinks like git-pbuilder-squeeze and
# git-qemubuilder-squeeze-amd64 pointing to git-pbuilder and auto-detecting
# the builder, distribution, and architecture from that.
default_BUILDER=${0#*git-}
default_DIST=${default_BUILDER#*-}
default_BUILDER=${default_BUILDER%%-*}
case $default_BUILDER in
    pbuilder|cowbuilder) default_BUILDER=cowbuilder ;;
    /*)                  default_BUILDER=cowbuilder ;;
esac
case $default_BUILDER in
    *builder) ;;
    *)        default_BUILDER=cowbuilder ;;
esac
case $default_DIST in
    *builder)
        default_DIST=
        ;;
    *-*)
        default_ARCH=${default_DIST#*-}
        default_DIST=${default_DIST%%-*}
        ;;
esac
: ${default_BUILDER:=cowbuilder}

# Set BUILDER, DIST, and ARCH, allowing existing settings to override.
: ${BUILDER:=$default_BUILDER}
: ${DIST:=$default_DIST}
: ${ARCH:=$default_ARCH}

# If DIST ends in -backports, strip that out of DIST and add it to EXT.
if expr "$DIST" : '.*-backports$' >/dev/null; then
    DIST=${DIST%-backports}
    EXT="-backports"

    # The URL to the Debian backports repository to add to the chroot
    # configuration when created via this script for a distribution ending in
    # -backports.  Backports was incorporated into the main mirrors as of
    # wheezy.
    case $DIST in
        squeeze)
            BACKPORTS='http://backports.debian.org/debian-backports'
            ;;
        *)
            BACKPORTS='http://ftp.debian.org/debian'
            ;;
    esac
elif expr "$DIST" : '.*-lts$' >/dev/null; then
    DIST=${DIST%-lts}
    EXT="-lts"

    # The URL to the Debian LTS repository to add to the chroot
    # configuration when created via this script for a distribution ending in
    # -lts.
    LTS='http://ftp.debian.org/debian'
else
    EXT=
fi

# Make sure we have the necessary tools.
if [ ! -x /usr/sbin/"$BUILDER" ]; then
    echo "$BUILDER not found; you need to install the $BUILDER package" >&2
    exit 1
fi

# Default options come from the environment.  Use eval to parse
# GIT_PBUILDER_OPTIONS and GIT_PBUILDER_PDEBUILDOPTIONS into arrays, since
# some arguments may have quoting.
eval "OPTIONS=( $GIT_PBUILDER_OPTIONS )"
eval "PDEBUILDOPTS=( $GIT_PBUILDER_PDEBUILDOPTIONS )"
OUTPUT_DIR="${GIT_PBUILDER_OUTPUT_DIR:-../}"

# How we handle options depends on what type of builder we're using.  Ignore
# options if $GIT_PBUILDER_AUTOCONF is set to no.
if [ no != "$GIT_PBUILDER_AUTOCONF" ]; then
    case $BUILDER in
        pbuilder)
            # The root directory where different pbuilder --basetgz files are
            # found.  git-pbuilder expects them to be named base-<dist>.tgz.
            : ${PBUILDER_BASE:=/var/cache/pbuilder}

            # If DIST is set, use base-$DIST.tgz.  If DIST is not set, the sid
            # chroot may be either base.tgz or base-sid.tgz.  Try both.  If
            # ARCH is set, use base-$DIST-$ARCH.tgz.
            : ${DIST:=sid}
            if [ -n "$ARCH" ] ; then
                BASE="$PBUILDER_BASE/base-$DIST$EXT-$ARCH.tgz"
                OPTIONS+=( --architecture "$ARCH" )
            elif [ "$DIST" = 'sid' ] ; then
                if [ -f "$PBUILDER_BASE/base-sid.tgz" ]; then
                    BASE="$PBUILDER_BASE/base-sid.tgz"
                else
                    BASE="$PBUILDER_BASE/base.tgz"
                fi
            else
                BASE="$PBUILDER_BASE/base-$DIST$EXT.tgz"
            fi
            OPTIONS+=( --basetgz "$BASE" )

            # Make sure the base tarball exists.
            if [ ! -f "$BASE" ] && [ "$1" != "create" ]; then
                echo "Base tarball $BASE does not exist" >&2
                exit 1
            fi

            # Set --debian-etch-workaround if DIST is etch.  Assume that
            # everything else is new enough that it will be fine.
            if [ "$DIST" = 'etch' ] || [ "$DIST" = 'ebo' ]; then
                OPTIONS+=( --debian-etch-workaround )
            fi
            ;;
    
        cowbuilder)
            # The root directory where different cowbuilder --basepath
            # directories are found.  git-pbuilder expects them to be named
            # base-<dist>.cow.
            : ${COWBUILDER_BASE:=/var/cache/pbuilder}

            # If --basepath is specified on the command line we need to use
            # that and that alone, since if it's specified more than once,
            # cowbuilder will fail.
            bp_found=""
            for opt in $@; do
                case $opt in
                    --basepath|--basepath=*) bp_found="yes" ;;
                esac
            done

            # If --basepath wasn't already provided, we need to set it.  If
            # DIST is set, use base-$DIST.cow.  If DIST is not set, the sid
            # chroot may be either base.cow or base-sid.cow.  Try both.  If
            # ARCH is set, use base-$DIST-$ARCH.cow.
            if [ -z "$bp_found" ]; then
                : ${DIST:=sid}
                if [ -n "$ARCH" ]; then
                    BASE="$COWBUILDER_BASE/base-$DIST$EXT-$ARCH.cow"
                    OPTIONS+=( --architecture "$ARCH" )
                elif [ "$DIST" = 'sid' ]; then
                    if [ -d "$COWBUILDER_BASE/base-sid.cow" ] ; then
                        BASE="$COWBUILDER_BASE/base-sid.cow"
                    else
                        BASE="$COWBUILDER_BASE/base.cow"
                    fi
                else
                    BASE="$COWBUILDER_BASE/base-$DIST$EXT.cow"
                fi
                OPTIONS+=( --basepath "$BASE" )
    
                # Make sure the base directory exists.
                if [ ! -d "$BASE" ] && [ "$1" != "create" ]; then
                    echo "Base directory $BASE does not exist" >&2
                    exit 1
                fi
            fi
    
            # Set --debian-etch-workaround if DIST is etch.  Assume that
            # everything else is new enough that it will be fine.
            if [ "$DIST" = 'etch' ] || [ "$DIST" = 'ebo' ]; then
                OPTIONS+=( --debian-etch-workaround )
            fi
            ;;
    
        qemubuilder)
            # There always has to be an architecture for qemubuilder, and it
            # doesn't make much sense to default to the current architecture.
            # There's probably no good default, but this one at least makes
            # some sense.
            : ${DIST:=sid}
            : ${ARCH:=armel}
    
            # There has to be a configuration file matching our distribution
            # and architecture.
            QEMUCONFIG="/var/cache/pbuilder/$BUILDER-$ARCH-$DIST$EXT.conf"
            if [ ! -r "$QEMUCONFIG" ]; then
                echo "Cannot read configuration file $QEMUCONFIG" >&2
                exit 1
            fi
            OPTIONS+=( --config "$QEMUCONFIG" )
            ;;
    
        *)
            echo "Unknown builder $BUILDER" >&2
            exit 1
            ;;
    esac
fi

# If the first argument to the script is update, create, or login (or
# --update, --create, or --login), set the $action.
case $1 in
update|create|login)
    action="--$1"
    shift
    ;;
--update|--create|--login)
    action="$1"
    shift
    ;;
*)
    action=""
    ;;
esac

# If $action is set, run the builder for $action under sudo rather than
# proceeding.
if [ -n "$action" ]; then
    # Since we're running the builder under sudo, $HOME will change to root's
    # home directory and the user's .pbuilderrc won't be run.  sudo -E would
    # fix this, but that requires special configuration in sudoers to allow
    # it.  Instead, check if the user has a .pbuilderrc and, if so, explicitly
    # add it as a configuration file.
    if [ -f "$HOME/.pbuilderrc" ] ; then
        OPTIONS+=( --configfile "$HOME/.pbuilderrc" )
    fi

    # Check that sudo is installed and try to provide a useful error if it
    # is not.
    if ! which sudo >/dev/null 2>&1; then
        cat >&2 <<EOE
git-pbuilder: sudo not found in $PATH

sudo was not found in your path.  You need to install the sudo package and
allow the current user to invoke the builder via sudo.
EOE
        exit 1
    fi

    # Run the builder.
    if [ no = "$GIT_PBUILDER_AUTOCONF" ] ; then
        set -x
        sudo "$BUILDER" "$action" "${OPTIONS[@]}" "$@"
    else
        if [ "$EXT" = '-backports' ] ; then
            OTHERMIRROR="deb $BACKPORTS $DIST$EXT main"
            set -x
            sudo "$BUILDER" "$action" --distribution "$DIST" \
                --othermirror "$OTHERMIRROR" "${OPTIONS[@]}" "$@"
        elif [ "$EXT" = '-lts' ] ; then
            OTHERMIRROR="deb $LTS $DIST$EXT main"
            set -x
            sudo "$BUILDER" "$action" --distribution "$DIST" \
                --othermirror "$OTHERMIRROR" "${OPTIONS[@]}" "$@"
        else
            set -x
            sudo "$BUILDER" "$action" --distribution "$DIST" \
                "${OPTIONS[@]}" "$@"
        fi
    fi
    { set +x; } 2>/dev/null
    exit 0
fi

# Build package: not (update | create | login)
if [ -z "$GBP_BUILD_DIR" ]; then
    echo "Warning: git-pbuilder should be run via 'gbp buildpackage'" >&2
fi

# Print out some information about what we're doing.
building="Building with $BUILDER"
if [ no = "$GIT_PBUILDER_AUTOCONF" ] ; then
    echo "$building"
elif [ -n "$ARCH" ] ; then
    echo "$building for distribution $DIST$EXT, architecture $ARCH"
else
    echo "$building for distribution $DIST$EXT"
fi

# Source package format 1.0 doesn't automatically exclude Git files, so we
# want to add the appropriate flags to do that.  But source package format 3.0
# does exclude by default and has many other ways of controlling those
# exclusions that we don't want to tromp on.  So we don't want to give any -i
# or -I flags unless we're using source format 1.0.
if [ ! -f debian/source/format ] || grep -qs '^1.0' debian/source/format ; then
    echo 'Source format 1.0 detected, adding exclude flags'
    DEBBUILDOPTS="-i'(?:^|/)\\.git(attributes)?(?:\$|/.*\$)' -I.git"
else
    DEBBUILDOPTS=''
fi

# Add all of the additional arguments we got on the command line, but quote
# them from the shell since they'll undergo another round of shell expansion
# when the pbuilder runs debbuild.
for arg in "$@" ; do
    DEBBUILDOPTS+=" $(shell_quote "$arg")"
done

# Now we can finally run pdebuild.  The quoting here is tricky, but this
# seems to pass everything through properly.
if [ no = "$GIT_PBUILDER_AUTOCONF" ] ; then
    set -e; set -x
    pdebuild --pbuilder "$BUILDER" --debbuildopts "$DEBBUILDOPTS" \
        "${PDEBUILDOPTS[@]}" -- "${OPTIONS[@]}"
    { set +x; } 2>/dev/null; set +e
else
    set -e; set -x
    pdebuild --buildresult "$OUTPUT_DIR" --pbuilder "$BUILDER" \
        --debbuildopts "$DEBBUILDOPTS" "${PDEBUILDOPTS[@]}" -- "${OPTIONS[@]}"
    { set +x; } 2>/dev/null; set +e
fi
exit 0

# Documentation.  Use a hack to hide this from the shell.  Because of the
# above exit line, this should never be executed.
DOCS=<<__END_OF_DOCS__

=head1 NAME

git-pbuilder - Wrapper around cowbuilder/qemubuilder for gbp buildpackage

=head1 SYNOPSIS

DIST=I<distribution> ARCH=I<architecture> [BUILDER=(pbuilder|qemubuilder)] \
    B<git-pbuilder> I<debbuild-options>

DIST=I<distribution> ARCH=I<architecture> [BUILDER=(pbuilder|qemubuilder)] \
    B<git-pbuilder> (update | create | login) I<cowbuilder-options>

=head1 DESCRIPTION

B<git-pbuilder> is a wrapper around B<pdebuild> intended for use by
B<gbp buildpackage>.  It configures B<pdebuild> to use B<cowbuilder> by
default, passes appropriate options to B<debbuild>, and sets the base path
for B<cowbuilder> based on the environment variable DIST and, if set, the
environment variable ARCH.  B<qemubuilder> can be selected instead by
setting the environment variable BUILDER to C<qemubuilder>, and
B<pbuilder> can be selected by setting BUILDER to C<pbuilder>.

By default, B<git-pbuilder> assumes the target distribution is C<sid>, the
same architecture as the B<cowbuilder> default, and uses
F</var/cache/pbuilder/base-sid.cow> if it exists.  If it doesn't,
F</var/cache/pbuilder/base.cow> is tried.  If DIST is set, its value is
the target distribution and F</var/cache/pbuilder/base-I<dist>.cow> is
used instead.  If DIST is C<etch> or C<ebo>, B<--debian-etch-workaround>
is also passed to B<cowbuilder>.  If ARCH is set, its value is the target
architecture and F</var/cache/pbuilder/base-I<dist>-I<arch>.cow> is used,
with I<dist> being set to C<sid> if DIST was not set.

If B<qemubuilder> is used as the builder, no base directory is used.
Instead, B<qemubuilder> is invoked with the B<--config> option pointing to
the file F</var/cache/pbuilder/qemubuilder-I<arch>-I<dist>.conf>

If B<pbuilder> is used as the builder, B<git-pbuilder> instead looks for
F</var/cache/pbuilder/base-sid.tgz> by default and
F</var/cache/pbuilder/base.tgz> if it doesn't exist.  If DIST or ARCH are
set, they are used to form the expected name of the tgz file in the same
way as they're used to form the expected base directory for B<cowbuilder>.
Similar to B<cowbuilder>, B<--debian-etch-workaround> is passed to
B<pbuilder> if from the DIST setting it looks like the target distribution
is etch.

If B<git-pbuilder> is invoked via a name that starts with C<git-*->, the
part between the hyphens is taken to be the default name of the builder to
use.  However, C<pbuilder> is mapped to B<cowbuilder> for backward
compatibility; if you want to use B<pbuilder>, you have to explicitly set
BUILDER.  The part after the last hyphen is taken to be the default
distribution (if it contains no additional hyphen) or the default
distribution followed by the default architecture (if it contains a
hyphen).  One can therefore create symlinks like C<git-pbuilder-squeeze>
pointing to B<git-pbuilder> and use that name when wanting to use a
distribution of C<squeeze>, or C<git-qemubuilder-sid-armel> to use
B<qemubuilder> to build for the C<armel> architecture and the C<sid>
distribution.  Explicit settings of BUILDER, DIST, or ARCH always override
any guesses from the command name.  (But note that B<gbp buildpackage>
does not pass on environment variables when run with B<--git-pbuilder>;
see below.)

Any arguments are passed as-is to B<dpkg-buildpackage> via the
B<--debbuildopts> option to B<pdebuild>.  To pass arguments to the builder
instead, put them in the environment variable GIT_PBUILDER_OPTIONS.

To disable all attempts to discover the base path, tarball, or
configuration file and set up the pbuilder options and instead rely on the
settings in .pbuilderrc, set GIT_PBUILDER_AUTOCONF to C<no>.

Normally, one does not run this script directly.  Instead, it's used as
the builder script for B<gbp buildpackage> via the B<--git-pbuilder>
command-line option.  When run this way, you should use the B<--git-dist>,
B<--git-arch>, B<--git-qemubuilder>, B<--git-pbuilder-autoconf>, and
B<--git-pbuilder-options> flags instead of setting the DIST, ARCH, BUILDER,
GIT_PBUILDER_AUTOCONF, and GIT_PBUILDER_OPTIONS environment variables.  See
L<gbp-buildpackage(1)> for more information.

Alternately, B<git-pbuilder> may be called with an argument of C<update>,
C<create>, or C<login>.  In this case, it calls B<cowbuilder> (or the
configured builder as described above) using B<sudo> and passes the
corresponding command to the builder, using the same logic as above to
determine the base directory and distribution.  If the distribution (set
in DIST) ends in C<-backports>, one of the following will be added as an
B<--othermirror> parameter to the builder:

    deb http://ftp.debian.org/debian $DIST main
    deb http://backports.debian.org/debian-backports $DIST main

The first will be used for most distributions, and the second for
C<squeeze-backports>. If the distribution ends in C<-lts>, the following will
be added as an B<--othermirror> parameter to the builder:

    deb http://ftp.debian.org/debian $DIST main

to support building for Long Term Support releases.

Any additional arguments to B<git-pbuilder> are passed along to the
builder.  Due to how B<sudo> works, invoking the builder with an action
will not read the user's F<.pbuilderrc> by default, so in this case
B<git-pbuilder> will add an explicit B<--configfile> option pointing to
the user's F<.pbuilderrc> if it exists.

If you use B<git-pbuilder> with one of these arguments, you must have
the C<sudo> package installed, and you must configure B<sudo> to let the
current user run the appropriate builder command.

=head1 ENVIRONMENT

=over 4

=item ARCH

Sets the target architecture.  For a B<cowbuilder> builder, this sets both
the base path and is passed as the B<--architecture> option.  With
B<qemubuilder>, this controls the path to the configuration file.  With
B<pbuilder>, this sets the tgz path and is passed as B<--architecture>.

=item BUILDER

Sets the builder to use.  The only supported settings are C<cowbuilder>
(the default), C<qemubuilder>, and C<pbuilder>.

=item COWBUILDER_BASE

Set this environment variable to change the default location for the
cowbuilder base directories (F</var/cache/pbuilder>).

=item DIST

Sets the target distribution.  This is used primarily to determine the
base path for B<cowbuilder> or B<pbuilder> or the configuration file path
for B<qemubuilder>, but it's also used to determine whether to pass
B<--debian-etch-workaround> to B<cowbuilder> or B<pbuilder>.

=item GIT_PBUILDER_AUTOCONF

If set to C<no>, disable the logic that constructs the base path, tarball,
or configuration file and all other logic to determine the options to pass
to the builder.  Instead, just run the configured builder and assume its
configuration is handled elsewhere (such as in F<.pbuilderrc>).  This also
suppresses setting B<--buildresult>, so the user will need to ensure that
the configuration still puts packages where B<gbp buildpackage> expects
them.

=item GIT_PBUILDER_OPTIONS

Add additional options for the builder.  These options are passed as-is to
B<cowbuilder>, B<qemubuilder>, or B<pbuilder> via B<pdebuild>.  The
contents of this variable will undergo shell expansion, so any arguments
containing shell metacharacters or whitespace need to be quoted in the
value of the environment variable.

=item GIT_PBUILDER_OUTPUT_DIR

Where to put the result of the build.  The default is C<..> (the parent
directory).  This setting is ignored if GIT_PBUILDER_AUTOCONF is set to
C<no>.

=item GIT_PBUILDER_PDEBUILDOPTIONS

Add additional options for B<pdebuild> itself (such as
B<--use-pdebuild-internal>).  The contents of this variable will undergo
shell expansion, so any arguments containing shell metacharacters or
whitespace need to be quoted in the value of the environment variable.

=item PBUILDER_BASE

Set this environment variable to change the default location for the
pbuilder tgz files (F</var/cache/pbuilder>) when BUILDER is set to
C<pbuilder>.

=back

=head1 FILES

=over 4

=item /var/cache/pbuilder/base-sid.cow

=item /var/cache/pbuilder/base.cow

The default C<cowbuilder --basepath> directories, searched for in that
order, if neither DIST nor ARCH is set.

=item /var/cache/pbuilder/base-sid-$ARCH.cow

The C<cowbuilder --basepath> directory used if ARCH is set and DIST is not
set.

=item /var/cache/pbuilder/base-$DIST.cow

The C<cowbuilder --basepath> directory used if DIST is set and ARCH is
not.

=item /var/cache/pbuilder/base-$DIST-$ARCH.cow

The C<cowbuilder --basepath> directory used if DIST and ARCH are both set.

=item /var/cache/pbuilder/base-sid.tgz

=item /var/cache/pbuilder/base.tgz

=item /var/cache/pbuilder/base-sid-$ARCH.tgz

=item /var/cache/pbuilder/base-$DIST.tgz

=item /var/cache/pbuilder/base-$DIST-$ARCH.tgz

Similar to the above, the C<pbuilder --basetgz> path used for various
settings of DIST and ARCH if BUILDER is set to C<pbuilder>.

=item /var/cache/pbuilder/qemubuilder-$ARCH-$DIST.conf

The C<qemubuilder --config> file used.  $ARCH defaults to C<armel> and
$DIST defaults to C<sid> if not set.

=back

=head1 SEE ALSO

cowbuilder(8), dpkg-buildpackage(1), gbp-buildpackage(1), pbuilder(8),
pdebuild(1), qemubuilder(8), sudo(8)

The latest version of this script is available from
L<http://www.eyrie.org/~eagle/software/scripts/>.

=head1 AUTHOR

Russ Allbery <eagle@eyrie.org>

=cut

__END_OF_DOCS__