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#! /bin/sh
set -eu
# requires env:
# $state_dir
# $origin
# in PATH: git,lentil,coreutils
subdir=`echo "$1" | tr -dc "[:alnum:]"`
name=`echo "$origin" | tr -dc "[:alnum:]"`
track="$state_dir/$name-checkout"
(if test -e "$track" ;then
cd "$track"
git fetch origin master
git reset --hard origin/master
else
git clone "$origin" "$track"
fi) >&2
cd "$track"
lentil "${subdir:-.}" -f csv | sed 1d | shuf | head -1
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