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#!/bin/bash
function help {
cat <<EOHELP
Utilities to read/write the git hash for the project.
The script will attempt to get info in the following order:
- Using a git command
- Using a hash file (if speficied by user)
- Otherwise hash = 0xFFFFFFFF
Usage: $0 [--help|-h] [--write] [--hashfile=HASH_FILE]
--hashfile : Location of git hash file [project.githash]
--write : Write the git hash to HASH_FILE in the Ettus 32-bit register format
--help : Shows this message
EOHELP
}
hashfile="project.githash"
write=0
for arg in "$@"; do
if [[ $arg == "--help" ]]; then
help
exit 0
elif [[ $arg =~ "--hashfile="(.*) ]]; then
hashfile=${BASH_REMATCH[1]}
elif [[ $arg =~ "--write" ]]; then
write=1
fi
done
# Default hash value (failsafe)
ettus_githash32="ffffffff"
if [[ $write -eq 0 ]]; then
git_success=0
# First attempt: Use git
if [[ $(command -v git) != "" ]]; then
# Attempt to get hash from git.
# This command will fail if we are not in a git tree
short_hash="$(git rev-parse --verify HEAD --short=7 2>/dev/null)" && git_success=1
if [[ $git_success -eq 1 ]]; then
# Check if tree is clean. If yes, the top 4 bits are 0
if [[ -z $(git status --porcelain --untracked-files=no 2>/dev/null) ]]; then
ettus_githash32="0$short_hash"
else
ettus_githash32="f$short_hash"
fi
fi
fi
# Second attempt: Read from file if it exists
if [[ $git_success -eq 0 ]]; then
if [[ -f $hashfile ]]; then
ettus_githash32=$(cat $hashfile)
fi
fi
echo ${ettus_githash32}
exit 0
else
# Require git
command -v git >/dev/null || { echo "ERROR: git not found"; exit 1; }
# Get hash from git
short_hash="$(git rev-parse --verify HEAD --short=7 2>/dev/null)" || { echo "ERROR: Not a git tree"; exit 2; }
# Check if tree is clean. If yes, the top 4 bits are 0
if [[ -z $(git status --porcelain --untracked-files=no 2>/dev/null) ]]; then
ettus_githash32="0$short_hash"
else
ettus_githash32="f$short_hash"
fi
echo $ettus_githash32 > $hashfile
echo "INFO: Wrote $ettus_githash32 to $hashfile"
exit 0
fi
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