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C_RED="$(echo -e '\e[31m')"
C_GREEN="$(echo -e '\e[32m')"
C_YELLOW="$(echo -e '\e[33m')"
C_NORMAL="$(echo -e '\e[0m')"
export DEBIAN_FRONTEND=noninteractive
B_APT_UPDATED=
progress ()
{
echo "${C_GREEN}$1${C_NORMAL}" >&2
}
note ()
{
echo "${C_YELLOW}$1${C_NORMAL}" >&2
}
warn ()
{
echo "${C_RED}WARNING: $1${C_NORMAL}" >&2
}
die ()
{
echo "${C_RED}ERROR: $1${C_NORMAL}" >&2
exit 1
}
update-pkgs ()
{
if [ -z "$B_APT_UPDATED" ] ; then
apt update
B_APT_UPDATED=1
fi
}
install-pkgs ()
{
update-pkgs
apt install -y --no-install-recommends --no-install-suggests "$@"
}
install-config ()
{
[ $# = 2 ] || die "Usage: install-config <source> (<target-file> | <target-dir>/)"
local S=$1
local T=$2
if [ ${T%/} != $T ] ; then
T=$T$(basename $S)
fi
local B=$BUILD_CONFIG$T
mkdir -p $(dirname $B) $(dirname $T)
if [ -f $T ] ; then
if [ ! -f $B.orig ] ; then
echo "Backing up $T to $B.orig"
cp $T $B.orig
else
echo "Backup of $T already present in $B.orig"
fi
fi
if [ -f $S ] ; then
# Just a new file: overwrite
echo "Overwriting $T"
cp $S $T
cp $S $B.new
elif [ -f $S.orig -a -f $S.new ] ; then
# Try 3-way merge
if cmp --quiet $S.new $T ; then
warn "Skipping merge of $T: changes already present"
else
echo "Merging $T"
if diff3 -m $S.new $S.orig $T >$B.new ; then
cp $B.new $T
else
die "Merge failed, please review $B.new"
fi
fi
else
die "Do not know how to install config $T"
fi
}
sed-config ()
{
[ $# = 2 ] || die "Usage: sed-config <target> <sed-script>"
local T=$1
local SCRIPT=$2
local B=$BUILD_CONFIG$T
mkdir -p $(dirname $B)
[ -f $T ] || die "Want to sed $T, but it is missing"
if [ ! -f $B.orig ] ; then
echo "Backing up $T to $B.orig"
cp $T $B.orig
else
echo "Backup of $T already present in $B.orig"
fi
sed -ri "$SCRIPT" $T
cp $T $B.new
}
pipe-config ()
{
[ $# = 1 ] || die "Usage: <command> | pipe-config <target>"
local TMP=$(mktemp)
cat >$TMP
install-config $TMP $1
rm $TMP
}
rm-config ()
{
[ $# = 1 ] || die "Usage: rm-config <target>"
local T=$1
local B=$BUILD_CONFIG$T
if [ -f $T ] ; then
if [ ! -f $B.orig ] ; then
echo "Backing up $T to $B.orig"
cp $T $B.orig
fi
echo "Removing $T"
rm -f $T
else
echo "Wanted to remove $T, but it does not exist"
fi
}
download ()
{
[ $# = 3 ] || die "Usage: download <URL> <hash-type> <hash>"
local URL=$1
local HTYPE=$2
local HASH=$3
local DEST=$(basename $URL)
local CACHE=/root/.cache/download
if [ -d $CACHE ] ; then
if [ -f $CACHE/$DEST ] ; then
echo "Using cached $DEST"
else
echo "Downloading $URL with caching"
curl $URL >$CACHE/$DEST.tmp
mv $CACHE/$DEST.tmp $CACHE/$DEST
fi
ln -s $CACHE/$DEST .
else
warn "Cache $CACHE not found: downloading directly"
echo "Downloading $URL"
curl $URL >$DEST
fi
local H=$(${HTYPE}sum $DEST | cut -d' ' -f1)
[ $H == $HASH ] || die "Mismatched hash: got $H, want $HASH"
}