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#!/bin/sh
imgdir=./debootstrap
warn() { printf 'Warning: %s\n' "$*" >&2; }
die() { printf 'Error: %s\n' "$*" >&2; exit 1; }
[ -d "$imgdir" ] || die "directory does not exist: $imgdir"
usage()
{
cat <<EOF >&2
Usage:
$0 init <suite>
$0 new <suite> <new-name>
$0 clone <suite> <source-name> <new-name>
$0 chroot <suite> <name>
$0 list
EOF
list
exit 1
}
list()
{
local f suite name header_printed=
for f in $imgdir/*.btrfs; do
[ -e "$f" ] || continue
f=${f##*/}
f=${f%.btrfs}
case "$f" in *.*) continue ;; esac
suite=${f%%-*}
[ "$header_printed" ] || echo 'Existing initialized suites:'
printf ' %s\n' "$suite"
header_printed=y
done
header_printed=
for f in $imgdir/*.*.btrfs; do
[ -e "$f" ] || continue
f=${f##*/}
f=${f%.btrfs}
suite=${f%%-*}
name=${f##*.}
[ "$header_printed" ] || echo 'Existing images:'
printf ' %s %s\n' "$suite" "$name"
header_printed=y
done
}
validate_suite()
{
case "$1" in
jessie|stretch|sid) return 0 ;;
*) return 1 ;;
esac
}
i_am_root() { [ "$(id -u)" = 0 ]; }
btrfs_show_subvolume_id()
{
local result path="$1"
result=$(btrfs subvolume show "$path" | sed -n -e 's/^[ \t]*Subvolume ID:[ \t]*//p; s/.*is toplevel subvolume/5/p')
if [ "$result" ]
then printf '%s\n' "$result"
else false
fi
}
mkfs_btrfs()
{
local target="$1"
mountpoint="$2" # can't be local because of trap
mkfs.btrfs "$target" || die "mkfs.btrfs failed"
mount -t btrfs "$target" "$mountpoint" || die "mount failed"
trap 'umount "$mountpoint"' EXIT
btrfs subvolume create "$mountpoint"/root || die "command 'btrfs subvolume create' failed"
mkdir -p "$mountpoint"/root/var/cache/apt
btrfs subvolume create "$mountpoint"/root/var/cache/apt/archives || die "command 'btrfs subvolume create' failed"
subvol_id=$(btrfs_show_subvolume_id "$mountpoint"/root) || die "could not find btrfs subvolume name"
btrfs subvolume set-default "$subvol_id" "$mountpoint" || die "command 'btrfs subvolume set-default' failed"
trap - EXIT
umount "$mountpoint"
}
suite_to_basename()
{
suite=$1
variant=minbase
arch=$(dpkg-architecture -q DEB_HOST_ARCH) || die "command 'dpkg-architecture' failed"
printf '%s\n' "$suite-$variant-$arch.btrfs"
}
suite_name_to_imagename()
{
suite=$1
name=$2
variant=minbase
arch=$(dpkg-architecture -q DEB_HOST_ARCH) || die "command 'dpkg-architecture' failed"
printf '%s/%s-%s-%s.%s.btrfs\n' "$imgdir" "$suite" "$variant" "$arch" "$name"
}
chroot_image()
{
suite=$1
name=$2
[ "$suite" -a "$name" ] || usage
imagename=$(suite_name_to_imagename "$suite" "$name")
[ -e "$imagename" ] || die "no such file: $imagename"
[ -d "$imagename".mnt ] || mkdir "$imagename".mnt || die "mkdir"
mountpoint -q "$imagename".mnt || mount "$imagename" "$imagename".mnt || die "mount"
unshare -f -m -p \
chroot "$imagename".mnt \
/bin/sh -c 'mount -t proc proc /proc; mount -t devpts devpts /dev/pts; exec /bin/bash'
r=$?
umount "$imagename".mnt
rmdir "$imagename".mnt
return $r
}
clone()
{
suite=$1
source_name=$2
name=$3
[ "$suite" -a "$name" -a "$source_name" ] || usage
image_basename=$imgdir/$(suite_to_basename "$suite") || die 'suite_to_basename'
source=${image_basename%.btrfs}.$source_name.btrfs
dest=${image_basename%.btrfs}.$name.btrfs
[ -e "$source" ] || die "source image not found -- run '$0 new $suite $source_name' to create it"
[ ! -e "$dest" ] || die "file exists: $dest"
cp --reflink=always "$source" "$dest"
}
new()
{
suite=$1
name=$2
[ "$suite" -a "$name" ] || usage
image_basename=$imgdir/$(suite_to_basename "$suite") || die 'suite_to_basename'
source=$image_basename
dest=${source%.btrfs}.$name.btrfs
[ -e "$source" ] || die "source image not found -- run '$0 init $suite' to create it"
[ ! -e "$dest" ] || die "file exists: $dest"
cp --reflink=always "$source" "$dest"
}
init()
{
suite=$1
variant=minbase
arch=$(dpkg-architecture -q DEB_HOST_ARCH) || die "command 'dpkg-architecture' failed"
size=1G # truncate(1) format
i_am_root || die 'you are not root'
validate_suite "$suite" || die "invalid suite: '$suite'"
target=$imgdir/$suite-$variant-$arch.btrfs
[ -e "$target" ] && return
[ -e "$target".tmp ] && die "refusing to overwrite existing temporary file: $target.tmp"
[ -d "$target".mnt ] || mkdir "$target".mnt || die "could not create directory $target.mnt"
truncate -s "$size" "$target".tmp || die "truncate failed"
mkfs_btrfs "$target".tmp "$target".mnt || die "btrfs filesystem creation failed"
mount -t btrfs "$target".tmp "$target".mnt || die "mount failed"
trap 'umount "$target.mnt"' EXIT
debootstrap_efficiently "$arch" "$variant" "$suite" \
"$target".mnt "${target%.btrfs}".debs.txt || die "debootstrap failed"
if umount "$target".mnt
then trap - EXIT
else warn "umount failed"
fi
mv "$target".tmp "$target"
}
debootstrap_efficiently()
{
local arch="$1" variant="$2" suite="$3" target="$4" savedebs="$5"
set -- --arch "$arch" --variant "$variant" "$suite" "$target"
debs=$(debootstrap --print-debs --keep-debootstrap-dir "$@" | tee "$savedebs") || die "debootstrap failed"
for deb in $debs; do
cp /var/cache/apt/archives/${deb}_* $target/var/cache/apt/archives/
done
debootstrap "$@" || die "debootstrap failed"
}
case "$1" in
init|new|clone|list) cmd=$1; shift; $cmd "$@" ;;
chroot) cmd=chroot_image; shift; $cmd "$@" ;;
*) usage ;;
esac
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