#!/usr/bin/env bash
#
# usage:
#   maint/cargo-crate-owners
#
# Lists the ownerships of all published crates to stderr,
# and checks that they're all the same.
#
# Exit status is
#   0      all crates have the same owners
#   2      some crates have varying own ers
#   other  trouble
#
# crates which are mentioned in the workspace, but which have never been published,
# are ignored.

set -e
set -o pipefail

maint=maint
# shellcheck source=maint/crates-io-utils.sh
source "$maint"/crates-io-utils.sh
crates=$("$maint"/list_crates)

if [ $# != 0 ]; then fail 'bad usage: no arguments allowed'; fi

tmp_trap_exit_setup

for p in $crates; do
    printf "checking owners of %-40s " "$p"
    crates_io_api_call "v1/crates/$p/owners" .users "$tmp/p,$p.json"

    case "$http_code" in
	404)
	    echo "unpublished"
	    continue
	    ;;
	200)
	    ;;
	*)
	    fail 'internal error'
	    ;;
    esac

    jq -S '.users[].login' <"$tmp/p,$p.json" >"$tmp/owners,$p.json"
    hash=$(sha256sum <"$tmp/owners,$p.json")
    hash=${hash%% *}
    cp "$tmp/owners,$p.json" "$tmp/byhash.$hash.owners"
    printf '%s\n' "$p" >>"$tmp/byhash.$hash.packages"

    n_owners=$(jq <"$tmp/owners,$p.json" 1 | wc -l)
    n_packages=$(wc -l <"$tmp/byhash.$hash.packages")
    printf '%d owners (group size: %d)\n' "$n_owners" "$n_packages"
done

wc -l "$tmp"/byhash.*.packages | grep -v ' total$' | sort -rn >"$tmp/list"

n_groups=$(wc -l <"$tmp/list")

if [ "$n_groups" = 1 ]; then
    echo
    echo 'all ownerships are identical:'
    echo
    status=0
else
    cat <<END

ownerships of published crates vary!
$n_groups different sets of owners

END
    status=2
fi

# in case we want to redirect the report at some future point
exec 4>&2

exec 3<"$tmp/list"
# shellcheck disable=SC2162 # we don't need -r, it has no backslashes
while read <&3 n_packages packages_file; do
    owners_file="${packages_file%.packages}.owners"
    n_packages=$(wc -l <"$packages_file")
    echo "$n_packages package(s) have the following owner(s):" >&4
    sed 's/^/\t/' "$owners_file" | cat -v >&4
    echo "  those are owner(s) of the following package(s):" >&4
    sed 's/^/\t/' "$packages_file" >&4
    echo >&4
done

tmp_trap_exit_finish_status $status