Code Location: git://sbcl.git.sourceforge.net/gitroot/sbcl/sbcl.gitmaster
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generate-version.sh
#!/bin/sh
# Not a shell script, but something intended to be sourced from shell scripts
git_available_p() {
    # Check that (1) we have git (2) this is a git tree.
    if ( which git >/dev/null 2>/dev/null && git describe >/dev/null 2>/dev/null )
    then
        echo "ok"
    else
        echo ""
    fi
}

generate_version() {
    AVAILABLE=`git_available_p`
    if [ -f version.lisp-expr -a -z "$AVAILABLE" ]
    then
        # Relase tarball, leave version.lisp-expr alone.
        return
    elif [ -z "$AVAILABLE" ]
    then
        echo "Can't run 'git describe' and version.lisp-expr is missing." >&2
        echo "To fix this, either install git or create a fake version.lisp-expr file." >&2
        echo "You can create a fake version.lisp-expr file like this:" >&2
        echo "    \$ echo '\"1.0.99.999\"' > version.lisp-expr" >&2
        exit 1
    fi
    # Build it.
    version_head=`git rev-parse HEAD`
    if grep -q "ref: refs/heads/.*" .git/HEAD > /dev/null 2>&1
    then
        version_branchname=`cut -d / -f 3- < .git/HEAD`
    else
        # Detached head.
        version_branchname="HEAD"
    fi
    if [ -z "$SBCL_BUILDING_RELEASE_FROM" ]
    then
        if [ "`git rev-list HEAD --not origin/master`" = '' ]
        then
            # If origin/master contains all the commits on current
            # branch, use current head as the root instead.
            version_root="$version_branchname"
        else
            version_root="origin/master"
        fi
    else
        version_root="$SBCL_BUILDING_RELEASE_FROM"
    fi
    version_base=`git rev-parse "$version_root"`
    version_tag=`git describe --tags --match="sbcl*" --abbrev=0 $version_base`
    version_release=`echo $version_tag | sed -e 's/sbcl[_-]//' | sed -e 's/_/\./g'`
    # Using wc -l instead of --count argument to rev-list because
    # pre-1.7.2 Gits are still common out in the wilderness.
    version_n_root=`git rev-list $version_base --not $version_tag | wc -l`
    version_n_branch=`git rev-list HEAD --not $version_base | wc -l`
    if [ -z "$NO_GIT_HASH_IN_VERSION" ]
    then
        version_hash="-`git rev-parse --short $version_head`"
    else
        version_hash=""
    fi
    if git diff HEAD --no-ext-diff --quiet --exit-code
    then
        version_dirty=""
    else
        version_dirty="-dirty"
    fi
    # Now that we have all the pieces, put them together.
    cat >version.lisp-expr <<EOF
;;; This file is auto-generated using generate-version.sh. Every time
;;; you re-run make.sh, this file will be overwritten if you are
;;; working from a Git checkout.
EOF
    if [ "$version_base" = "$version_head" ]
    then
        if [ "0" = "$version_n_root" ]
        then
            printf "\"%s%s\"\n" \
                $version_release $version_dirty >>version.lisp-expr
        else
            printf "\"%s.%s%s%s\"\n" \
                $version_release $version_n_root \
                $version_hash $version_dirty >>version.lisp-expr
        fi
    else
        echo "base=$version_base"
        echo "head=$version_head"
        printf "\"%s.%s.%s.%s%s%s\"\n" \
            $version_release $version_n_root \
            $version_branchname $version_n_branch \
            $version_hash $version_dirty >>version.lisp-expr
    fi
}