git ssb

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#!/bin/sh
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# git-ssb v2.7.0 binary installer.
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# Copyright 2020 cel @f/6sQ6d2CMxRUhLpspgGIulDxDCwYD7DzFzPNr7u5AU=.ed25519
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# Usage of the works is permitted provided that this instrument is
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# retained with the works, so that any entity that uses the works is
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# notified of this instrument.
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# DISCLAIMER: THE WORKS ARE WITHOUT WARRANTY.
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{ # Only execute if entire script is read
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version=2.7.0
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blobs_prefix=${BLOBS_PREFIX:-http://localhost:8989/blobs/get}
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max_tries=10
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is_dir_in_path() { case ":$PATH:" in *:"$dir":*) return 0;; *) return 1;; esac }
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# Pick installation directory.
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# $BIN_DIR overrides.
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if [ -n "$BIN_DIR" ]; then
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	dir=$BIN_DIR
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else
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	# If root user, install system-wide.
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	# Prefer $PREFIX/bin if set.
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	if [ ${UID:-$(id -u)} = 0 ]
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	then set -- "${PREFIX:+$PREFIX/bin}" /usr/local/bin /opt/bin
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	else set -- "${PREFIX:+$PREFIX/bin}" ~/.local/bin ~/bin /usr/local/bin /opt/bin
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	fi
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	# Try to find a directory that is writable and in $PATH.
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	for dir; do
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		is_dir_in_path "$dir" && break || false
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	done || for dir; do
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		# Fall back to use or create a sensible directory.
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		mkdir -vp "$dir" && {
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			is_dir_in_path "$dir" || printf 'Warning: install directory is not in $PATH\n' >&2
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		}
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	done || {
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		printf 'Unable to find directory to install to.' >&2
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		exit 1
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	}
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fi
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cd "$dir" || exit 1
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system=$(uname -sm)
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case "$system" in
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	Linux\ aarch64) set -- \
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		'&FuEB1/cg0lDFQLtTs9ssgZVUsLNGIK4AzeoNWcvczHY=.sha256' \
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		'&htorGp8VGgPm26OX+so4yeTLmefStU0D8I0Nal1L9TM=.sha256' \
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		'&aeAukW57G8IDHw+cZhnWWt612/wTuHlGlxvF6+TKI5E=.sha256' \
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		'&LDJzHMS/WB6d6koLZWTjW2bV40xafZRmUixzMtxQtXI=.sha256' \
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		'&tdxQN/2eqG1jffYhICvm/Jur5alAxg74wwbA/hnHa2k=.sha256';;
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	Linux\ i686) set -- \
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		'&9GLKZFDOQcvGKrdIaSZ0Lae2ECTpIutrdLkQvEWCsZQ=.sha256' \
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		'&qNnPksNvZb7Fu3vIxQVSEkuhJkT0Se35ENNOYq0n2d0=.sha256' \
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		'&s+r8iLtDH3omWt0s+TOUjaXNhTTo5T6QOt+uQViVyhA=.sha256';;
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	Linux\ armv7l) set -- \
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		'&ChBEP/AQTlpEcHhJIZ/q4NjJUCu4mcTs2fZV5lFdXWw=.sha256' \
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		'&M+0VduMNaixEe3dRS4YtYHS21+dZzZC/na8iTF2dMZ0=.sha256' \
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		'&wYo+DyX0D/Jog24Y4cElta21xwesKF9lSpdWQ8sgRUQ=.sha256' \
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		'&Xu3D6uHGm6nhnGMVTke/T6Wc/tOXZndBVevaQCvLLCM=.sha256';;
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	Linux\ x86_64) set -- \
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		'&i3zGqeyKY/kiPB16QEoYyNfhaTlUp6SMpWnoUMC3QDI=.sha256' \
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		'&/iwz3UVEV+tcF/E7t8h8XIAIyMiCZc+949jJV4EbTUk=.sha256' \
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		'&SAA+m3ha1EIzRp7tHKSDDdWe3jJZ4RhgGuhpSs5wqhc=.sha256' \
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		'&d7M41GGbclGr9I7lrV2WABfiYcC1nztYoEH1z+epKEA=.sha256';;
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	Darwin*\ x86_64) set -- \
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		'&29FiLMMYVKaq9BAx9FCRpwh+Z3vjivaZlX93PqvQIOk=.sha256' \
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		'&4cUioC57AHK0NBo5lIyawWJhn0EQFzovqgKIfCfiTp4=.sha256' \
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		'&XYKxDOrVnDfaijhojKC6mPzBtyF5mczNOEpJXElhzcg=.sha256';;
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	*)
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		printf 'System not recognized: %s\n' "$system" >&2
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		exit 1
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		;;
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esac
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printf 'Installing git-ssb %s to %s\n' "$version" "$dir"
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# Want each blob in parallel
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for id; do curl -sSI -o /dev/null "$blobs_prefix/$id" & done
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# Fetch, concat, and extract blobs
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tries=0
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while ! for id
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do
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	printf "%s\n" "$id" >&2
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	curl -sS "$blobs_prefix/$id"
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done | tar xvz
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do
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	if [ $((tries = tries + 1)) -ge $max_tries ]
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	then
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		printf 'Unable to get blobs\n' >&2
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		exit 1
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	fi
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	sleep 1
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done
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echo 'Installation complete.'
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}
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