version.sh

#!/bin/sh
# Generate version information from git

GIT_SHA1="00000000"
GIT_DIRTY="0"

# Check if we're in a git repository
if command -v git >/dev/null 2>&1 && [ -d .git ] || git rev-parse --git-dir > /dev/null 2>&1; then
    # Get the short SHA1
    GIT_SHA1=$(git rev-parse --short=8 HEAD 2>/dev/null || echo "00000000")
    
    # Check if working directory is dirty
    git diff-index --quiet HEAD -- 2>/dev/null
    if [ $? -ne 0 ]; then
        GIT_DIRTY="1"
    else
        GIT_DIRTY="0"
    fi
fi

# Generate the header file
cat > version.h.tmp << EOF
/* This file is automatically generated by version.sh */
#ifndef MEMTIER_VERSION_H
#define MEMTIER_VERSION_H

#define MEMTIER_GIT_SHA1 "$GIT_SHA1"
#define MEMTIER_GIT_DIRTY "$GIT_DIRTY"

#endif /* MEMTIER_VERSION_H */
EOF

# Only update version.h if it changed (to avoid unnecessary recompilation)
if [ ! -f version.h ] || ! cmp -s version.h.tmp version.h; then
    mv version.h.tmp version.h
else
    rm -f version.h.tmp
fi