git-checkhash

#!/bin/bash
# Author: Gokberk Cinbis, 2017
set -e

if [ "$#" -eq 1 ]; then
    file="$1"
else
    echo 'git-checkhash <file>'
    echo ''   
    echo 'Check the current git hash to make sure the right code-base is being used for evaluating a pre-trained model'
    echo 'Test fails if there are uncommitted changes or the current commit hash differs from the one in <file>.'
    echo ''
    echo 'EXIT CODES'
    echo '  0 if check passes'
    echo '  non-zero otherwise, with following details:'
    echo '      1 if <file> does not exist'
    echo '      2 if there are uncommitted changes'
    echo '      3 if working copy corresponds to a different commit'
    echo '      4 if the number of input args is invalid'
    echo '      some non-zero if git-writehash reports another error'
    echo ''
    echo 'Important: for some errors, there may not be any error message printed on screen'
    echo ''
    echo 'Suggested use of the exit code:'
    echo '  if git-checkhash <file>; then echo "git-checkhash passed"; else exit $?; fi'
    echo ''   
    echo 'SUGGESTED USE'   
    echo 'Call git-uniqueid to generate a log directory in the beginning of an experiment script'   
    echo 'Call git-writehash to write the current hash into a file into the log directory'
    echo 'Call git-checkhash at test time to make sure that the right revision is being used at evaluation time (if necessary)'
    echo ''   
    echo 'PACKAGE'
    echo 'git-uniqueid    Generate a unique log file/directory name for running an experiment'
    echo 'git-writehash   Write git hash into a file'
    echo 'git-checkhash   Check whether the current git hash to make sure the right code-base is being used for evaluating a pre-trained model'
    exit 4
fi

if [ ! -f $file ]
then
    echo "git-checkhash: $file does not exit."
    exit 1
fi
idf=$(command cat $file)

# handle this explicitly to report the problem:
if [[ ! -z $(command git status -s) ]]; then # see https://stackoverflow.com/questions/3878624/how-do-i-programmatically-determine-if-there-are-uncommited-changes
    echo "git-checkhash: there are uncommitted changes. Checkout version ${idf} to use the right version."
    exit 2
fi

idg=$(command git-writehash) # exits automatically if git-writehash returns a non-zero exit code.

# trim
idf=$(echo -e "${idf}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
idg=$(echo -e "${idg}" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')

if [ "${idf}" == "${idg}" ]
then
    echo "git-checkhash: OK."
    exit 0
else
    echo "git-checkhash: hash differs. Checkout version ${idf} to use the right version."
    # RUN: "git checkout ${idf}"
    exit 3
fi