Simpliying download-latest.sh script

[curquiza]

A huge part of download-latest.sh script is about ensuring we download the latest version of Meilisearch regarding semver and NOT regarding date.

For example, I release Meilisearch v2.1 and then 1 week later I release v1.39 (for security support), when using the script, I want to download v2.1 despite v1.39 has been released after.

Here is the related part of code

meilisearch/download-latest.sh

Lines 23 to 146 in c7caadb

	# semverParseInto and semverLT from: https://github.com/cloudflare/semver_bash/blob/master/semver.sh
	# usage: semverParseInto version major minor patch special
	# version: the string version
	# major, minor, patch, special: will be assigned by the function
	semverParseInto() {
	local RE='[^0-9]*\([0-9]*\)[.]\([0-9]*\)[.]\([0-9]*\)\([0-9A-Za-z-]*\)'
	# MAJOR
	eval $2=`echo $1 | sed -e "s#$RE#\1#"`
	# MINOR
	eval $3=`echo $1 | sed -e "s#$RE#\2#"`
	# PATCH
	eval $4=`echo $1 | sed -e "s#$RE#\3#"`
	# SPECIAL
	eval $5=`echo $1 | sed -e "s#$RE#\4#"`
	}
	# usage: semverLT version1 version2
	semverLT() {
	local MAJOR_A=0
	local MINOR_A=0
	local PATCH_A=0
	local SPECIAL_A=0
	local MAJOR_B=0
	local MINOR_B=0
	local PATCH_B=0
	local SPECIAL_B=0
	semverParseInto $1 MAJOR_A MINOR_A PATCH_A SPECIAL_A
	semverParseInto $2 MAJOR_B MINOR_B PATCH_B SPECIAL_B
	if [ $MAJOR_A -lt $MAJOR_B ]; then
	return 0
	fi
	if [ $MAJOR_A -le $MAJOR_B ] && [ $MINOR_A -lt $MINOR_B ]; then
	return 0
	fi
	if [ $MAJOR_A -le $MAJOR_B ] && [ $MINOR_A -le $MINOR_B ] && [ $PATCH_A -lt $PATCH_B ]; then
	return 0
	fi
	if [ "_$SPECIAL_A" == '_' ] && [ "_$SPECIAL_B" == '_' ] ; then
	return 1
	fi
	if [ "_$SPECIAL_A" == '_' ] && [ "_$SPECIAL_B" != '_' ] ; then
	return 1
	fi
	if [ "_$SPECIAL_A" != '_' ] && [ "_$SPECIAL_B" == '_' ] ; then
	return 0
	fi
	if [ "_$SPECIAL_A" < "_$SPECIAL_B" ]; then
	return 0
	fi
	return 1
	}
	# Get a token from: https://github.com/settings/tokens to increase rate limit (from 60 to 5000),
	# make sure the token scope is set to 'public_repo'.
	# Create GITHUB_PAT environment variable once you acquired the token to start using it.
	# Returns the tag of the latest stable release (in terms of semver and not of release date).
	get_latest() {
	# temp_file is needed because the grep would start before the download is over
	temp_file=$(mktemp -q /tmp/$PNAME.XXXXXXXXX)
	if [ $? -ne 0 ]; then
	echo "$0: Can't create temp file, bye bye.."
	exit 1
	fi
	if [ -z "$GITHUB_PAT" ]; then
	curl -s $GITHUB_API > "$temp_file" || return 1
	else
	curl -H "Authorization: token $GITHUB_PAT" -s $GITHUB_API > "$temp_file" || return 1
	fi
	releases=$(cat "$temp_file" | \
	grep -E '"tag_name":|"draft":|"prerelease":' \
	| tr -d ',"' | cut -d ':' -f2 | tr -d ' ')
	# Returns a list of [tag_name draft_boolean prerelease_boolean ...]
	# Ex: v0.10.1 false false v0.9.1-rc.1 false true v0.9.0 false false...
	i=0
	latest=''
	current_tag=''
	for release_info in $releases; do
	# Checking tag_name
	if [ $i -eq 0 ]; then
	# If it's not an alpha or beta release
	if echo "$release_info" | grep -q "$GREP_SEMVER_REGEXP"; then
	current_tag=$release_info
	else
	current_tag=''
	fi
	i=1
	# Checking draft boolean
	elif [ $i -eq 1 ]; then
	if [ "$release_info" = 'true' ]; then
	current_tag=''
	fi
	i=2
	# Checking prerelease boolean
	elif [ $i -eq 2 ]; then
	if [ "$release_info" = 'true' ]; then
	current_tag=''
	fi
	i=0
	# If the current_tag is valid
	if [ "$current_tag" != '' ]; then
	# If there is no latest yes
	if [ "$latest" = '' ]; then
	latest="$current_tag"
	else
	# Comparing latest and the current tag
	semverLT $current_tag $latest
	if [ $? -eq 1 ]; then
	latest="$current_tag"
	fi
	fi
	fi
	fi
	done
	rm -f "$temp_file"
	return 0
	}

But this part is useless because

1. Currently we don't support multiple versions of Meilisearch
2. Now, GitHub let us decide which version is the latest, see

Goal of the issues

Remove the complex part to download the latest release only using the GitHub API without caring of the returned version since the latest returned by GitHub is the one we want to provide

Related issues

Will fix #2613
The future PR will close #2699