get_repo_version.sh

#!/bin/bash

# This script prints the "version" of the repository.
# The defenition of version is:
# If there is a tag points to the current commit - the prefix will be the tag. If not, it will be the current commit.
# If the repository is dirty, it will add "-dirty" as suffix.
# Examples:
# Tag and not dirty:		v1.2.3
# Tag and dirty:		v1.2.3-dirty
# Not a tag and not dirty:	3cccdf4a163d0b9fea760d5de83ad2ed23dc938d
# Not a tag and dirty: 		3cccdf4a163d0b9fea760d5de83ad2ed23dc938d-dirty

_is_repo()
{
	git branch > /dev/null 2>&1;
	if [ $? -eq 0 ]; then
		return;
	fi
	false;
}

_is_clean()
{
	git status | grep -q "nothing to commit"  ;
	if [ $? -eq 0 ]; then
		return;
	fi
	false;
}

_get_commit()
{
	local commit=`git rev-parse HEAD` 2> /dev/null;
	echo "$commit"
}

_get_tag()
{
	local commit=$1
	local tag=`git describe --exact-match $commit 2> /dev/null` ;
	echo "$tag";
}

get_repo_version()
{
	if ! _is_repo; then
		>&2 echo "Not git repository"
		exit 1;
	fi
	tag=$(_get_tag);
	if [ -z $tag ]; then
		version=$(_get_commit)
	else
		version=$tag
	fi

	if ! _is_clean; then
		version=$version-dirty
	fi

	echo $version
}

BASH_SOURCE=".$0" # cannot be changed in bash
test ".$0" != ".$BASH_SOURCE" || get_repo_version