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tailscale-android/version/mkversion.sh

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#!/bin/sh
set -eu
mode=$1
describe=$2
other=$3
# Git describe output overall looks like
# MAJOR.MINOR.PATCH-NUMCOMMITS-GITHASH. Depending on the tag being
# described and the state of the repo, ver can be missing PATCH,
# NUMCOMMITS, or both.
#
# Valid values look like: 1.2.3-1234-abcdef, 0.98-1234-abcdef,
# 1.0.0-abcdef, 0.99-abcdef.
ver="${describe#v}"
stem="${ver%%-*}" # Just the semver-ish bit e.g. 1.2.3, 0.98
suffix="${ver#$stem}" # The rest e.g. -23-abcdef, -abcdef
# Normalize the stem into a full major.minor.patch semver. We might
# not use all those pieces depending on what kind of version we're
# making, but it's good to have them all on hand.
case "$stem" in
*.*.*)
# Full SemVer, nothing to do
stem="$stem"
;;
*.*)
# Old style major.minor, add a .0
stem="${stem}.0"
;;
*)
echo "Unparseable version $stem" >&2
exit 1
;;
esac
major=$(echo "$stem" | cut -f1 -d.)
minor=$(echo "$stem" | cut -f2 -d.)
patch=$(echo "$stem" | cut -f3 -d.)
# Extract the change count and git ID from the suffix.
case "$suffix" in
-*-*)
# Has both a change count and a commit hash.
changecount=$(echo "$suffix" | cut -f2 -d-)
githash=$(echo "$suffix" | cut -f3 -d-)
;;
-*)
# Git hash only, change count is zero.
changecount="0"
githash=$(echo "$suffix" | cut -f2 -d-)
;;
*)
echo "Unparseable version suffix $suffix" >&2
exit 1
;;
esac
# The git hash is of the form "gCOMMITHASH". We want to replace the
# 'g' with a 't', for "tailscale", to convey that it's specifically
# the commit hash of the tailscale repo.
if [ -n "$githash" ]; then
# POSIX shell doesn't understand ${foo:1:9} syntax, gaaah.
githash="$(echo $githash | cut -c2-10)"
githash="t${githash}"
fi
# "other" is a second git commit hash for another repository used to
# build the Tailscale code. In practice it's either the commit hash in
# the Android repository, or the commit hash of Tailscale's
# proprietary repository (which pins a bunch things like build scripts
# used and Go toolchain version).
if [ -n "$other" ]; then
other="$(echo $other | cut -c1-9)"
other="-g${other}"
fi
# Validate that the version data makes sense. Rules:
# - Odd number minors are unstable. Patch must be 0, and gets
# replaced by changecount.
# - Even number minors are stable. Changecount must be 0, and
# gets removed.
#
# After this section, we only use major/minor/patch, which have been
# tweaked as needed.
if expr "$minor" : "[0-9]*[13579]$" >/dev/null; then
# Unstable
if [ "$patch" != "0" ]; then
# This is a fatal error, because a non-zero patch number
# indicates that we created an unstable git tag in violation
# of our versioning policy, and we want to blow up loudly to
# get that fixed.
echo "Unstable release $describe has a non-zero patch number, which is not allowed" >&2
exit 1
fi
patch="$changecount"
else
# Stable
if [ "$changecount" != "0" ]; then
# This is a commit that's sitting between two stable
# releases. We never want to release such a commit to the
# pbulic, but it's useful to be able to build it for
# debugging. Just force the version to 0.0.0, so that we're
# forced to rely on the git commit hash.
major="0"
minor="0"
patch="0"
fi
fi
if [ "$minor" -eq 1 ]; then
# Hack for 1.1: add 1000 to the patch number, so that builds that
# use the OSS change count order after the builds that used the
# proprietary repo's changecount. Otherwise, the version numbers
# would go backwards and things would be unhappy.
patch=$((patch + 1000))
fi
case "$1" in
long)
echo "${major}.${minor}.${patch}-${githash}${other}"
;;
short)
echo "${major}.${minor}.${patch}"
;;
xcode)
# CFBundleShortVersionString: the "short name" used in the App
# Store. eg. 0.92.98
echo "VERSION_NAME = ${major}.${minor}.${patch}"
# CFBundleVersion: the build number. Needs to be 3 numeric
# sections that increment for each release according to SemVer
# rules.
#
# We start counting at 100 because we submitted using raw
# build numbers before, and Apple doesn't let you start over.
# e.g. 0.98.3 -> 100.98.3
echo "VERSION_ID = $((major + 100)).${minor}.${patch}"
;;
esac