This file is indexed.

/etc/schroot/setup.d/90apt-sources is in sbuild-launchpad-chroot 0.4.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
# Copyright © 2012  Andy Whitcroft <apw@ubuntu.com>
#
# schroot is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# schroot is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see
# <http://www.gnu.org/licenses/>.
#
#####################################################################

set -e

. "$SETUP_DATA_DIR/common-data"
. "$SETUP_DATA_DIR/common-functions"
if [ -f "$SETUP_DATA_DIR/common-config" ]; then
    . "$SETUP_DATA_DIR/common-config"
else
    # handle precise where we cannot set variables, and do not get
    # alias information.
    desc="`schroot --config -c "$CHROOT_NAME" | \
    awk -F= '
        /^description/ {
            r=$2
            for (n=3; n <= NF; n++) { r = r "=" $n }
             print r
        }
    '`"

    case "$desc" in
    *apt.enable=true*)
    APT_ENABLE=true
    CHROOT_ALIAS="$CHROOT_NAME"
    CHROOT_NAME=`echo "$desc" | sed -e 's/apt.enable=true//' -e 's/^ *//' -e 's/ *$//'` 
    ;;
    esac
fi

changed=false
if [ $STAGE = "setup-start" ] || [ $STAGE = "setup-recover" ]; then
    sources="${CHROOT_PATH}/etc/apt/sources.list"

    if [ "$CHROOT_SESSION_PURGE" = 'false' ]; then
        exit 0
    fi

    # Alias driven mode.
    if [ -n "$APT_ENABLE" ]; then
        suite="proposed"
        comp="universe"
        [ -n "$APT_DEFAULT_SUITE" ] && suite="$APT_DEFAULT_SUITE"
        [ -n "$APT_DEFAULT_COMPONENT" ] && comp="$APT_DEFAULT_COMPONENT"

        # "Subtract" the CHROOT_NAME from the CHROOT_ALIAS to extract
        # the pocket/component information.
        suite_comp=`awk -v base="$CHROOT_NAME" -v name="$CHROOT_ALIAS" '
                BEGIN {
                        bbh = split(base, bb, "-")
                        nbh = split(name, nb, "-")
                        bbl = 1
                        nbl = 1

                        while (bbl <= bbh && bb[bbl] == nb[nbl]) { bbl++; nbl++; }
                        while (bbh >= bbl && bb[bbh] == nb[nbh]) { bbh--; nbh--; }

                        extra=""
                        for (; nbl <= nbh; nbl++) {
                                extra = extra "-" nb[nbl]
                        }
                        print(substr(extra, 2))
                }
        '`

        case "$suite_comp" in
            '')
                ;;
            *+*)
                suite=`echo "$suite_comp" | sed -e 's/\+.*//'`
                comp=`echo "$suite_comp" | sed -e 's/[^\+]*+//'`
                ;;
            *)
                suite="$suite_comp"
            ;;
        esac

        case "$suite" in
            release)    suites="" ;;
            security)    suites="security" ;;
            updates)    suites="security updates" ;;
            proposed)    suites="security updates proposed" ;;
            *) echo "unknown suite $suite" 1>&2; exit 1 ;;
        esac
        case "$comp" in
            main)        comps="main" ;;
            restricted)    comps="main restricted" ;;
            universe)    comps="main universe" ;;
            multiverse)    comps="main restricted universe multiverse" ;;
            '')        ;;
            *) echo "unknown component $comp" 1>&2; exit 1 ;;
        esac

        APT_POCKETS="$suites"
        APT_COMPONENTS="$comps"
    fi

    if [ -n "$APT_POCKETS" ]; then
        echo "setting apt pockets to 'release $APT_POCKETS' in sources.list"
        awk -v pockets="$APT_POCKETS" '
            BEGIN        { n = 0; split(pockets, plist); }
            /^#/        { print ; next }
            ($3 !~ /-/)    { print;
                      release = $3;
                      for (m in plist) {
                        $3 = release "-" plist[m];
                        new[n] = $0; n++;
                      }
                        next;
                    }
            END        { for (x = 0; x < n; x++) {
                        print new[x]
                      }
                    }
        ' <"$sources" >"$sources.new"
        mv "$sources.new" "$sources"
        changed=true
    fi
    if [ -n "$APT_COMPONENTS" ]; then
        echo "setting apt components to '$APT_COMPONENTS' in sources.list"
        awk -v components="$APT_COMPONENTS" '
            /^#/        { print ; next }
                    { print $1 " " $2 " " $3 " " components }
        ' <"$sources" >"$sources.new"
        mv "$sources.new" "$sources"
        changed=true
    fi

    if [ "$VERBOSE" = 'verbose' -a "$changed" = 'true' ]; then
        echo "Resulting sources.list"
        cat "$sources"
    fi
fi