mmdebstrap/make_mirror.sh

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#!/bin/sh
set -eu
# This script fills either cache.A or cache.B with new content and then
# atomically switches the cache symlink from one to the other at the end.
# This way, at no point will the cache be in an non-working state, even
# when this script got canceled at any point.
# Working with two directories also automatically prunes old packages in
# the local repository.
deletecache() {
dir="$1"
echo "running deletecache $dir">&2
if [ ! -e "$dir" ]; then
return
fi
if [ ! -e "$dir/mmdebstrapcache" ]; then
echo "$dir cannot be the mmdebstrap cache" >&2
return 1
fi
# be very careful with removing the old directory
# experimental is pulled in with USE_HOST_APT_CONFIG=yes on debci
# when testing a package from experimental
for dist in oldstable stable testing unstable experimental; do
# deleting artifacts from test "debootstrap"
for variant in minbase buildd -; do
if [ -e "$dir/debian-$dist-$variant.tar" ]; then
rm "$dir/debian-$dist-$variant.tar"
else
echo "does not exist: $dir/debian-$dist-$variant.tar" >&2
fi
done
# deleting artifacts from test "mmdebstrap"
for variant in essential apt minbase buildd - standard; do
for format in tar ext2 squashfs; do
if [ -e "$dir/mmdebstrap-$dist-$variant.$format" ]; then
# attempt to delete for all dists because DEFAULT_DIST might've been different the last time
rm "$dir/mmdebstrap-$dist-$variant.$format"
elif [ "$dist" = "$DEFAULT_DIST" ]; then
# only warn about non-existance when it's expected to exist
echo "does not exist: $dir/mmdebstrap-$dist-$variant.$format" >&2
fi
done
done
if [ -e "$dir/debian/dists/$dist" ]; then
rm --one-file-system --recursive "$dir/debian/dists/$dist"
else
echo "does not exist: $dir/debian/dists/$dist" >&2
fi
case "$dist" in oldstable|stable)
if [ -e "$dir/debian/dists/$dist-updates" ]; then
rm --one-file-system --recursive "$dir/debian/dists/$dist-updates"
else
echo "does not exist: $dir/debian/dists/$dist-updates" >&2
fi
;;
esac
case "$dist" in oldstable|stable)
if [ -e "$dir/debian-security/dists/$dist-security" ]; then
rm --one-file-system --recursive "$dir/debian-security/dists/$dist-security"
else
echo "does not exist: $dir/debian-security/dists/$dist-security" >&2
fi
;;
esac
done
for f in "$dir/debian-"*.ext4; do
if [ -e "$f" ]; then
rm --one-file-system "$f"
fi
done
# on i386 and amd64, the intel-microcode and amd64-microcode packages
# from non-free-firwame get pulled in because they are
# priority:standard with USE_HOST_APT_CONFIG=yes
for c in main non-free-firmware; do
if [ -e "$dir/debian/pool/$c" ]; then
rm --one-file-system --recursive "$dir/debian/pool/$c"
else
echo "does not exist: $dir/debian/pool/$c" >&2
fi
done
if [ -e "$dir/debian-security/pool/updates/main" ]; then
rm --one-file-system --recursive "$dir/debian-security/pool/updates/main"
else
echo "does not exist: $dir/debian-security/pool/updates/main" >&2
fi
for i in $(seq 1 6); do
if [ ! -e "$dir/debian$i" ]; then
continue
fi
rm "$dir/debian$i"
done
rm "$dir/mmdebstrapcache"
# remove all symlinks
find "$dir" -type l -delete
# now the rest should only be empty directories
if [ -e "$dir" ]; then
find "$dir" -depth -print0 | xargs -0 --no-run-if-empty rmdir
else
echo "does not exist: $dir" >&2
fi
}
cleanup_newcachedir() {
echo "running cleanup_newcachedir"
deletecache "$newcachedir"
}
cleanupapt() {
echo "running cleanupapt" >&2
if [ ! -e "$rootdir" ]; then
return
fi
for f in \
"$rootdir/var/cache/apt/archives/"*.deb \
"$rootdir/var/cache/apt/archives/partial/"*.deb \
"$rootdir/var/cache/apt/"*.bin \
"$rootdir/var/lib/apt/lists/"* \
"$rootdir/var/lib/dpkg/status" \
"$rootdir/var/lib/dpkg/lock-frontend" \
"$rootdir/var/lib/dpkg/lock" \
"$rootdir/var/lib/apt/lists/lock" \
"$rootdir/etc/apt/apt.conf" \
"$rootdir/etc/apt/sources.list.d/"* \
"$rootdir/etc/apt/preferences.d/"* \
"$rootdir/etc/apt/sources.list" \
"$rootdir/var/cache/apt/archives/lock"; do
if [ ! -e "$f" ]; then
echo "does not exist: $f" >&2
continue
fi
if [ -d "$f" ]; then
rmdir "$f"
else
rm "$f"
fi
done
find "$rootdir" -depth -print0 | xargs -0 --no-run-if-empty rmdir
}
# note: this function uses brackets instead of curly braces, so that it's run
# in its own process and we can handle traps independent from the outside
update_cache() (
dist="$1"
nativearch="$2"
# use a subdirectory of $newcachedir so that we can use
# hardlinks
rootdir="$newcachedir/apt"
mkdir -p "$rootdir"
# we only set this trap here and overwrite the previous trap, because
# the update_cache function is run as part of a pipe and thus in its
# own process which will EXIT after it finished
trap 'kill "$PROXYPID" || :;cleanupapt' EXIT INT TERM
for p in /etc/apt/apt.conf.d /etc/apt/sources.list.d /etc/apt/preferences.d /var/cache/apt/archives /var/lib/apt/lists/partial /var/lib/dpkg; do
mkdir -p "$rootdir/$p"
done
# read sources.list content from stdin
cat > "$rootdir/etc/apt/sources.list"
cat << END > "$rootdir/etc/apt/apt.conf"
Apt::Architecture "$nativearch";
Apt::Architectures "$nativearch";
Dir::Etc "$rootdir/etc/apt";
Dir::State "$rootdir/var/lib/apt";
Dir::Cache "$rootdir/var/cache/apt";
Apt::Install-Recommends false;
Apt::Get::Download-Only true;
Acquire::Languages "none";
Dir::Etc::Trusted "/etc/apt/trusted.gpg";
Dir::Etc::TrustedParts "/etc/apt/trusted.gpg.d";
Acquire::http::Proxy "http://127.0.0.1:8080/";
END
: > "$rootdir/var/lib/dpkg/status"
if [ "$dist" = "$DEFAULT_DIST" ] && [ "$nativearch" = "$HOSTARCH" ] && [ "$USE_HOST_APT_CONFIG" = "yes" ]; then
# we append sources and settings instead of overwriting after
# an empty line
for f in /etc/apt/sources.list /etc/apt/sources.list.d/*; do
[ -e "$f" ] || continue
[ -e "$rootdir/$f" ] && echo >> "$rootdir/$f"
# Filter out file:// repositories as they are added
# to each mmdebstrap call verbatim by
# debian/tests/copy_host_apt_config
# Also filter out all mirrors that are not of suite
# $DEFAULT_DIST, except experimental if the suite
# is unstable. This prevents packages from
# unstable entering a testing mirror.
if [ "$dist" = unstable ]; then
grep -v ' file://' "$f" \
| grep -E " (unstable|experimental) " \
>> "$rootdir/$f" || :
else
grep -v ' file://' "$f" \
| grep " $DEFAULT_DIST " \
>> "$rootdir/$f" || :
fi
done
for f in /etc/apt/preferences.d/*; do
[ -e "$f" ] || continue
[ -e "$rootdir/$f" ] && echo >> "$rootdir/$f"
cat "$f" >> "$rootdir/$f"
done
fi
echo "creating mirror for $dist" >&2
for f in /etc/apt/sources.list /etc/apt/sources.list.d/* /etc/apt/preferences.d/*; do
[ -e "$rootdir/$f" ] || continue
echo "contents of $f:" >&2
cat "$rootdir/$f" >&2
done
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get update --error-on=any
pkgs=$(APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get indextargets \
--format '$(FILENAME)' 'Created-By: Packages' "Architecture: $nativearch" \
| xargs --delimiter='\n' /usr/lib/apt/apt-helper cat-file \
| grep-dctrl --no-field-names --show-field=Package --exact-match \
\( --field=Essential yes --or --field=Priority required \
--or --field=Priority important --or --field=Priority standard \
\))
pkgs="$pkgs build-essential busybox gpg eatmydata fakechroot fakeroot"
# we need usr-is-merged to simulate debootstrap behaviour for all dists
# starting from Debian 12 (Bullseye)
case "$dist" in
oldstable) : ;;
*) pkgs="$pkgs usr-is-merged usrmerge" ;;
esac
# shellcheck disable=SC2086
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get --yes install $pkgs
rm "$rootdir/var/cache/apt/archives/lock"
rmdir "$rootdir/var/cache/apt/archives/partial"
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get --option Dir::Etc::SourceList=/dev/null update
APT_CONFIG="$rootdir/etc/apt/apt.conf" apt-get clean
cleanupapt
# this function is run in its own process, so we unset all traps before
# returning
trap "-" EXIT INT TERM
)
check_proxy_running() {
if timeout 1 bash -c 'exec 3<>/dev/tcp/127.0.0.1/8080 && printf "GET http://deb.debian.org/debian/dists/'"$DEFAULT_DIST"'/InRelease HTTP/1.1\nHost: deb.debian.org\n\n" >&3 && grep "Suite: '"$DEFAULT_DIST"'" <&3 >/dev/null' 2>/dev/null; then
return 0
elif timeout 1 env http_proxy="http://127.0.0.1:8080/" wget --quiet -O - "http://deb.debian.org/debian/dists/$DEFAULT_DIST/InRelease" | grep "Suite: $DEFAULT_DIST" >/dev/null; then
return 0
elif timeout 1 curl --proxy "http://127.0.0.1:8080/" --silent "http://deb.debian.org/debian/dists/$DEFAULT_DIST/InRelease" | grep "Suite: $DEFAULT_DIST" >/dev/null; then
return 0
fi
return 1
}
if [ -e "./shared/cache.A" ] && [ -e "./shared/cache.B" ]; then
echo "both ./shared/cache.A and ./shared/cache.B exist" >&2
echo "was a former run of the script aborted?" >&2
if [ -e ./shared/cache ]; then
echo "cache symlink points to $(readlink ./shared/cache)" >&2
case "$(readlink ./shared/cache)" in
cache.A)
echo "removing ./shared/cache.B" >&2
rm -r ./shared/cache.B
;;
cache.B)
echo "removing ./shared/cache.A" >&2
rm -r ./shared/cache.A
;;
*)
echo "unexpected" >&2
exit 1
;;
esac
else
echo "./shared/cache doesn't exist" >&2
exit 1
fi
fi
if [ -e "./shared/cache.A" ]; then
oldcache=cache.A
newcache=cache.B
else
oldcache=cache.B
newcache=cache.A
fi
oldcachedir="./shared/$oldcache"
newcachedir="./shared/$newcache"
oldmirrordir="$oldcachedir/debian"
newmirrordir="$newcachedir/debian"
mirror="http://deb.debian.org/debian"
security_mirror="http://security.debian.org/debian-security"
components=main
: "${DEFAULT_DIST:=unstable}"
: "${ONLY_DEFAULT_DIST:=no}"
: "${ONLY_HOSTARCH:=no}"
: "${HAVE_QEMU:=yes}"
: "${RUN_MA_SAME_TESTS:=yes}"
# by default, use the mmdebstrap executable in the current directory
: "${CMD:=./mmdebstrap}"
: "${USE_HOST_APT_CONFIG:=no}"
: "${FORCE_UPDATE:=no}"
if [ "$FORCE_UPDATE" != "yes" ] && [ -e "$oldmirrordir/dists/$DEFAULT_DIST/InRelease" ]; then
http_code=$(curl --output /dev/null --silent --location --head --time-cond "$oldmirrordir/dists/$DEFAULT_DIST/InRelease" --write-out '%{http_code}' "$mirror/dists/$DEFAULT_DIST/InRelease")
case "$http_code" in
200) ;; # need update
304) echo up-to-date; exit 0;;
*) echo "unexpected status: $http_code"; exit 1;;
esac
fi
./caching_proxy.py "$oldcachedir" "$newcachedir" &
PROXYPID=$!
trap 'kill "$PROXYPID" || :' EXIT INT TERM
for i in $(seq 10); do
check_proxy_running && break
sleep 1
done
if [ ! -s "$newmirrordir/dists/$DEFAULT_DIST/InRelease" ]; then
echo "failed to start proxy" >&2
kill $PROXYPID
exit 1
fi
trap 'kill "$PROXYPID" || :;cleanup_newcachedir' EXIT INT TERM
mkdir -p "$newcachedir"
touch "$newcachedir/mmdebstrapcache"
HOSTARCH=$(dpkg --print-architecture)
arches="$HOSTARCH"
if [ "$HOSTARCH" = amd64 ]; then
arches="$arches arm64 i386"
elif [ "$HOSTARCH" = arm64 ]; then
arches="$arches amd64 armhf"
fi
# we need the split_inline_sig() function
# shellcheck disable=SC1091
. /usr/share/debootstrap/functions
for dist in oldstable stable testing unstable; do
for nativearch in $arches; do
# non-host architectures are only downloaded for $DEFAULT_DIST
if [ "$nativearch" != "$HOSTARCH" ] && [ "$DEFAULT_DIST" != "$dist" ]; then
continue
fi
# if ONLY_DEFAULT_DIST is set, only download DEFAULT_DIST
if [ "$ONLY_DEFAULT_DIST" = "yes" ] && [ "$DEFAULT_DIST" != "$dist" ]; then
continue
fi
if [ "$ONLY_HOSTARCH" = "yes" ] && [ "$nativearch" != "$HOSTARCH" ]; then
continue
fi
# we need a first pass without updates and security patches
# because otherwise, old package versions needed by
# debootstrap will not get included
echo "deb [arch=$nativearch] $mirror $dist $components" | update_cache "$dist" "$nativearch"
# we need to include the base mirror again or otherwise
# packages like build-essential will be missing
case "$dist" in oldstable|stable)
cat << END | update_cache "$dist" "$nativearch"
deb [arch=$nativearch] $mirror $dist $components
deb [arch=$nativearch] $mirror $dist-updates main
deb [arch=$nativearch] $security_mirror $dist-security main
END
;;
esac
done
codename=$(awk '/^Codename: / { print $2; }' < "$newmirrordir/dists/$dist/InRelease")
ln -s "$dist" "$newmirrordir/dists/$codename"
# split the InRelease file into Release and Release.gpg not because apt
# or debootstrap need it that way but because grep-dctrl does
split_inline_sig \
"$newmirrordir/dists/$dist/InRelease" \
"$newmirrordir/dists/$dist/Release" \
"$newmirrordir/dists/$dist/Release.gpg"
touch --reference="$newmirrordir/dists/$dist/InRelease" "$newmirrordir/dists/$dist/Release" "$newmirrordir/dists/$dist/Release.gpg"
done
kill $PROXYPID
# Create some symlinks so that we can trick apt into accepting multiple apt
# lines that point to the same repository but look different. This is to
# avoid the warning:
# W: Target Packages (main/binary-all/Packages) is configured multiple times...
for i in $(seq 1 6); do
ln -s debian "$newcachedir/debian$i"
done
tmpdir=""
cleanuptmpdir() {
if [ -z "$tmpdir" ]; then
return
fi
if [ ! -e "$tmpdir" ]; then
return
fi
for f in "$tmpdir/worker.sh" "$tmpdir/mmdebstrap.service"; do
if [ ! -e "$f" ]; then
echo "does not exist: $f" >&2
continue
fi
rm "$f"
done
rmdir "$tmpdir"
}
SOURCE_DATE_EPOCH="$(date --date="$(grep-dctrl -s Date -n '' "$newmirrordir/dists/$DEFAULT_DIST/Release")" +%s)"
export SOURCE_DATE_EPOCH
if [ "$HAVE_QEMU" = "yes" ]; then
# we use the caching proxy again when building the qemu image
# - we can re-use the packages that were already downloaded earlier
# - we make sure that the qemu image uses the same Release file even
# if a mirror push happened between now and earlier
# - we avoid polluting the mirror with the additional packages by
# using --readonly
./caching_proxy.py --readonly "$oldcachedir" "$newcachedir" &
PROXYPID=$!
for i in $(seq 10); do
check_proxy_running && break
sleep 1
done
if [ ! -s "$newmirrordir/dists/$DEFAULT_DIST/InRelease" ]; then
echo "failed to start proxy" >&2
kill $PROXYPID
exit 1
fi
tmpdir="$(mktemp -d)"
trap 'kill "$PROXYPID" || :;cleanuptmpdir; cleanup_newcachedir' EXIT INT TERM
pkgs=perl-doc,systemd-sysv,perl,arch-test,fakechroot,fakeroot,mount,uidmap,qemu-user-static,qemu-user,dpkg-dev,mini-httpd,libdevel-cover-perl,libtemplate-perl,debootstrap,procps,apt-cudf,aspcud,python3,libcap2-bin,gpg,debootstrap,distro-info-data,iproute2,ubuntu-keyring,apt-utils,squashfs-tools-ng,genext2fs,linux-image-generic,passwd
if [ ! -e ./mmdebstrap ]; then
pkgs="$pkgs,mmdebstrap"
fi
arches=$HOSTARCH
if [ "$RUN_MA_SAME_TESTS" = "yes" ]; then
case "$HOSTARCH" in
amd64)
arches=amd64,arm64
pkgs="$pkgs,libfakechroot:arm64,libfakeroot:arm64"
;;
arm64)
arches=arm64,amd64
pkgs="$pkgs,libfakechroot:amd64,libfakeroot:amd64"
;;
esac
fi
cat << END > "$tmpdir/mmdebstrap.service"
[Unit]
Description=mmdebstrap worker script
[Service]
Type=oneshot
ExecStart=/worker.sh
[Install]
WantedBy=multi-user.target
END
# here is something crazy:
# as we run mmdebstrap, the process ends up being run by different users with
# different privileges (real or fake). But for being able to collect
# Devel::Cover data, they must all share a single directory. The only way that
# I found to make this work is to mount the database directory with a
# filesystem that doesn't support ownership information at all and a umask that
# gives read/write access to everybody.
# https://github.com/pjcj/Devel--Cover/issues/223
cat << 'END' > "$tmpdir/worker.sh"
#!/bin/sh
echo 'root:root' | chpasswd
mount -t 9p -o trans=virtio,access=any,msize=128k mmdebstrap /mnt
# need to restart mini-httpd because we mounted different content into www-root
systemctl restart mini-httpd
ip link set enp0s1 down || :
handler () {
while IFS= read -r line || [ -n "$line" ]; do
printf "%s %s: %s\n" "$(date -u -d "0 $(date +%s.%3N) seconds - $2 seconds" +"%T.%3N")" "$1" "$line"
done
}
(
cd /mnt;
if [ -e cover_db.img ]; then
mkdir -p cover_db
mount -o loop,umask=000 cover_db.img cover_db
fi
now=$(date +%s.%3N)
ret=0
{ { { { {
sh -x ./test.sh 2>&1 1>&4 3>&- 4>&-; echo $? >&2;
} | handler E "$now" >&3;
} 4>&1 | handler O "$now" >&3;
} 2>&1;
} | { read xs; exit $xs; };
} 3>&1 || ret=$?
echo $ret > /mnt/exitstatus.txt
if [ -e cover_db.img ]; then
df -h cover_db
umount cover_db
fi
) > /mnt/output.txt 2>&1
umount /mnt
systemctl poweroff
END
chmod +x "$tmpdir/worker.sh"
if [ -z ${DISK_SIZE+x} ]; then
DISK_SIZE=10G
fi
# set PATH to pick up the correct mmdebstrap variant
env PATH="$(dirname "$(realpath --canonicalize-existing "$CMD")"):$PATH" \
debvm-create --skip=usrmerge,systemdnetwork \
--size="$DISK_SIZE" --release="$DEFAULT_DIST" \
--output="$newcachedir/debian-$DEFAULT_DIST.ext4" -- \
--architectures="$arches" --include="$pkgs" \
--setup-hook='echo "Acquire::http::Proxy \"http://127.0.0.1:8080/\";" > "$1/etc/apt/apt.conf.d/00proxy"' \
--hook-dir=/usr/share/mmdebstrap/hooks/maybe-merged-usr \
--customize-hook='rm "$1/etc/apt/apt.conf.d/00proxy"' \
--customize-hook='mkdir -p "$1/etc/systemd/system/multi-user.target.wants"' \
--customize-hook='ln -s ../mmdebstrap.service "$1/etc/systemd/system/multi-user.target.wants/mmdebstrap.service"' \
--customize-hook='touch "$1/mmdebstrap-testenv"' \
--customize-hook='copy-in "'"$tmpdir"'/mmdebstrap.service" /etc/systemd/system/' \
--customize-hook='copy-in "'"$tmpdir"'/worker.sh" /' \
--customize-hook='echo 127.0.0.1 localhost > "$1/etc/hosts"' \
--customize-hook='printf "START=1\nDAEMON_OPTS=\"-h 127.0.0.1 -p 80 -u nobody -dd /mnt/cache -i /var/run/mini-httpd.pid -T UTF-8\"\n" > "$1/etc/default/mini-httpd"' \
"$mirror"
kill $PROXYPID
cleanuptmpdir
trap "cleanup_newcachedir" EXIT INT TERM
fi
# delete possibly leftover symlink
if [ -e ./shared/cache.tmp ]; then
rm ./shared/cache.tmp
fi
# now atomically switch the symlink to point to the other directory
ln -s $newcache ./shared/cache.tmp
mv --no-target-directory ./shared/cache.tmp ./shared/cache
deletecache "$oldcachedir"
trap - EXIT INT TERM
echo "$0 finished successfully" >&2