mmdebstrap/hooks/maybe-merged-usr/setup00.sh

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#!/bin/sh
set -eu
env --chdir="$1" APT_CONFIG="$MMDEBSTRAP_APT_CONFIG" apt-get update --error-on=any
# if the usr-is-merged package cannot be installed with apt, do nothing
if ! env --chdir="$1" APT_CONFIG="$MMDEBSTRAP_APT_CONFIG" apt-cache show --no-all-versions usr-is-merged > /dev/null 2>&1; then
echo "no package called usr-is-merged found -- not running merged-usr setup hook" >&2
exit 0
else
echo "package usr-is-merged found -- running merged-usr setup hook" >&2
fi
# resolve the script path using several methods in order:
# 1. using dirname -- "$0"
# 2. using ./hooks
# 3. using /usr/share/mmdebstrap/hooks/
for p in "$(dirname -- "$0")/.." ./hooks /usr/share/mmdebstrap/hooks; do
if [ -x "$p/merged-usr/setup00.sh" ] && [ -x "$p/merged-usr/essential00.sh" ]; then
"$p/merged-usr/setup00.sh" "$1"
exit 0
fi
done
echo "cannot find merged-usr hook anywhere" >&2
exit 1