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#!/usr/bin/env bash
((NEW_NIX_FIRST_BUILD_UID=301))
id_available(){
dscl . list /Users UniqueID | grep -E '\b'$1'\b' >/dev/null
}
change_nixbld_names_and_ids(){
local name uid next_id
((next_id=NEW_NIX_FIRST_BUILD_UID))
echo "Attempting to migrate nixbld users."
echo "Each user should change from nixbld# to _nixbld#"
echo "and their IDs relocated to $next_id+"
while read -r name uid; do
echo " Checking $name (uid: $uid)"
# iterate for a clean ID
while id_available "$next_id"; do
((next_id++))
if ((next_id >= 400)); then
echo "We've hit UID 400 without placing all of your users :("
echo "You should use the commands in this script as a starting"
echo "point to review your UID-space and manually move the"
echo "remaining users (or delete them, if you don't need them)."
exit 1
fi
done
if [[ $name == _* ]]; then
echo " It looks like $name has already been renamed--skipping."
else
# first 3 are cleanup, it's OK if they aren't here
sudo dscl . delete /Users/$name dsAttrTypeNative:_writers_passwd &>/dev/null || true
sudo dscl . change /Users/$name NFSHomeDirectory "/private/var/empty 1" "/var/empty" &>/dev/null || true
# remove existing user from group
sudo dseditgroup -o edit -t user -d $name nixbld || true
sudo dscl . change /Users/$name UniqueID $uid $next_id
sudo dscl . change /Users/$name RecordName $name _$name
# add renamed user to group
sudo dseditgroup -o edit -t user -a _$name nixbld
echo " $name migrated to _$name (uid: $next_id)"
fi
done < <(dscl . list /Users UniqueID | grep nixbld | sort -n -k2)
}
change_nixbld_names_and_ids
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