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tailscale/version/version.sh

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#!/bin/sh
set -eu
# Return the commitid of the given ref in the given repo dir. If the worktree
# or index is dirty, also appends -dirty.
#
# $ git_hash_dirty ../.. HEAD
# 1be01ddc6e430ca3aa9beea3587d16750efb3241-dirty
git_hash_dirty() {
(
cd "$1"
x=$(git rev-parse HEAD)
if ! git diff-index --quiet HEAD; then
x="$x-dirty"
fi
echo "$x"
)
}
case $# in
0|1)
# extra_hash_or_dir is either:
# - a git commitid
# or
# - the path to a git repo from which to calculate the real hash.
#
# It gets embedded as an additional commit hash in built
# binaries, to help us locate the exact set of tools and code
# that were used.
extra_hash_or_dir="${1:-}"
if [ -z "$extra_hash_or_dir" ]; then
# Nothing, empty extra hash is fine.
extra_hash=""
elif [ -d "$extra_hash_or_dir/.git" ]; then
extra_hash=$(git_hash_dirty "$extra_hash_or_dir" HEAD)
elif ! expr "$extra_hash_or_dir" : "^[0-9a-f]*$"; then
echo "Invalid extra hash '$extra_hash_or_dir', must be a git commit or path to a git repo" >&2
exit 1
else
extra_hash="$extra_hash_or_dir"
fi
# Load the base version and optional corresponding git hash
# from the VERSION file. If there is no git hash in the file,
# we use the hash of the last change to the VERSION file.
version_file="$(dirname $0)/../VERSION.txt"
IFS=".$IFS" read -r major minor patch base_git_hash <"$version_file"
if [ -z "$base_git_hash" ]; then
base_git_hash=$(git rev-list --max-count=1 HEAD -- "$version_file")
fi
git_hash=$(git_hash_dirty . HEAD)
# The number of extra commits between the release base to git_hash.
change_count=$(git rev-list --count HEAD "^$base_git_hash")
;;
6)
# Test mode: rather than run git commands and whatnot, take in
# all the version pieces as arguments.
git_hash=$1
extra_hash=$2
major=$3
minor=$4
patch=$5
change_count=$6
;;
*)
echo "Usage: $0 [extra-git-commitid-or-dir]"
exit 1
esac
# Shortened versions of git hashes, so that they fit neatly into an
# "elongated" but still human-readable version number.
short_git_hash=$(echo "$git_hash" | cut -c1-9)
short_extra_hash=$(echo "$extra_hash" | cut -c1-9)
# Convert major/minor/patch/change_count into an adjusted
# major/minor/patch. This block is where all our policies on
# versioning are.
if expr "$minor" : "[0-9]*[13579]$" >/dev/null; then
# Odd minor numbers are unstable builds.
if [ "$patch" != "0" ]; then
# This is a fatal error, because a non-zero patch number
# indicates that we created an unstable VERSION.txt in violation
# of our versioning policy, and we want to blow up loudly to
# get that fixed.
echo "Unstable release $major.$minor.$patch has a non-zero patch number, which is not allowed" >&2
exit 1
fi
patch="$change_count"
change_suffix=""
elif [ "$change_count" != "0" ]; then
# Even minor numbers are stable builds, but stable builds are
# supposed to have a zero change count. Therefore, we're currently
# describing a commit that's on a release branch, but hasn't been
# tagged as a patch release yet.
#
# We used to change the version number to 0.0.0 in that case, but that
# caused some features to get disabled due to the low version number.
# Instead, add yet another suffix to the version number, with a change
# count.
change_suffix="-$change_count"
else
# Even minor number with no extra changes.
change_suffix=""
fi
# Hack for 1.1: add 1000 to the patch number. We switched from using
# the proprietary repo's change_count over to using the OSS repo's
# change_count, and this was necessary to avoid a backwards jump in
# release numbers.
if [ "$major.$minor" = "1.1" ]; then
patch="$((patch + 1000))"
fi
# At this point, the version number correctly reflects our
# policies. All that remains is to output the various vars that other
# code can use to embed version data.
if [ -z "$extra_hash" ]; then
long_version_suffix="$change_suffix-t$short_git_hash"
else
long_version_suffix="$change_suffix-t$short_git_hash-g$short_extra_hash"
fi
cat <<EOF
VERSION_SHORT="$major.$minor.$patch"
VERSION_LONG="$major.$minor.$patch$long_version_suffix"
VERSION_GIT_HASH="$git_hash"
VERSION_EXTRA_HASH="$extra_hash"
VERSION_XCODE="$((major + 100)).$minor.$patch"
VERSION_WINRES="$major,$minor,$patch,0"
EOF