rustdatehash.sh

#!/bin/bash

# rustdatehash: computes a git commit hash for a nightly from a given date.
# Works from about 2015-03-01
# usage: ./rustdatehash yyyy-mm-dd

set -e
set -u
set -o pipefail

# not using $1 in grep because the date in version string sometimes doesn't match the argument
wget -q -O - https://static.rust-lang.org/dist/$1/rust-nightly-i686-unknown-linux-gnu.tar.gz |\
 gunzip -c |\
 strings -n 10 |\
 grep '([0-9a-z]\{5,\} 20[0-9][0-9]-[0-9][0-9]-[0-9][0-9])' -o |\
 grep '[0-9a-z]\{5,\}*' -o |\
 head -n 1