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#!/bin/bash
#
# Save/restore your .git/config files in a central place.
#
# When called as "git-config-save" or "git config-save",
# this scripts traverses a folder looking for all .git/config files
# and makes backups at ~/.config/gitconfigs.
#
# When called as "git-config-restore" or "git config-restore"
# it does the reverse operation: restores all .git/config
# files, replacing the current repository .git/config's by the one
# available from ~/.config/gitconfigs.
#
# Use cases:
#
# - You work with the repositories in multiple machines and is
# looking for a way to sync not just the content but also the
# same repository configuration (user name, remotes, etc).
#
# - You want to delete working copies of repositories but want
# to keep each repository configuration for future use. In that
# case all you have to do is to clone the repository again and
# run this command inside your working copy.
#
# You may want to put in a schedule job to process all your stuff regularly.
#
# Storage format:
#
# - Use ~/.config/gitconfigs/ as base.
# - Repository identifier is determined by it's path in the system.
# That's the best choice if you have the same repository checked out
# multiple times and with different configurations.
# - Repository identifier can also be determined by the first commit ID
# (not repo URL or any other volatile information). So this
# script may fail if you're doing improbable stuff like rebasing
# your repo and removing the initial commit.
#
# How it saves an item:
#
# - Find all git configurations.
# - Make a backup at $BASE/$ID/config.$DATE if config differs.
# - Save the config at $BASE/ID.
#
# How it restore an item:
#
# - Copy each config from $BASE/ID, if available and if it differs.
# - Restore always save a timestamped copy at .git/config.$DATE.
# Parameters
BASENAME="`basename $0`"
BASE="$HOME/.config/gitconfigs"
DATE="`date +%Y%m%d%I%M%S`"
FILENAME="gitconfig.saved"
OPTION="$1"
COUNTER="$BASE/counter"
SOMETIMES="20"
# Ensure we have a base and that is minimally safe
mkdir -p $BASE
chmod 700 $BASE
# Save config from a repository
function git_config_save {
# Check if we have a config
if [ ! -e ".git/config" ]; then
echo "$BASENAME: missing config at `pwd`"
return
fi
# Repository ID
# https://stackoverflow.com/questions/34874343/how-can-i-uniquely-identify-a-git-repository
#ID="`git rev-list --parents HEAD | tail -1`"
ID="$PWD"
# Display ID
#echo $ID
# Create config folder
mkdir -p $BASE/$ID
# Make a backup
if [ -f "$BASE/$ID/$FILENAME" ] && ! diff .git/config $BASE/$ID/$FILENAME &> /dev/null; then
echo "Differences detected at `pwd`, making a backup..."
cp $BASE/$ID/$FILENAME $BASE/$ID/$FILENAME.$DATE
fi
# Save
cp .git/config $BASE/$ID/$FILENAME
}
# Restore config tor a repository
function git_config_restore {
# Check if we have a config
if [ ! -e ".git/config" ]; then
echo "$BASENAME: missing config at `pwd`"
return
fi
# Repository ID
# https://stackoverflow.com/questions/34874343/how-can-i-uniquely-identify-a-git-repository
#ID="`git rev-list --parents HEAD | tail -1`"
ID="$PWD"
# Display ID
#echo $ID
# Create config folder
mkdir -p $BASE/$ID
# Check if we have a saved config
if [ ! -f "$BASE/$ID/$FILENAME" ]; then
echo "No config for `pwd`, skipping"
return
fi
# Make a backup
if ! diff .git/config $BASE/$ID/$FILENAME &> /dev/null; then
cp .git/config .git/config.$DATE
else
echo "Identical configs for `pwd`, skipping"
return
fi
# Restore
cp $BASE/$ID/$FILENAME .git/config
# Tell the user about the backup
echo "Backup saved at $pwd/.git/config.$DATE"
}
# Check option
if [ ! -z "$OPTION" ] && [ "$OPTION" == "--sometimes" ]; then
if [ ! -e "$COUNTER" ]; then
echo 0 > $COUNTER
fi
COUNT="`cat $COUNTER`"
if (($COUNT >= $SOMETIMES)); then
echo 0 > $COUNTER
else
let COUNT++
echo $COUNT > $COUNTER
echo "Running only sometimes. This is run ${COUNT} of ${SOMETIMES}, skipping."
exit 1
fi
fi
# Process everything we can find
find -type d -name .git | while read repo; do
# Get absolute folder
PWD="`cd $repo/.. &> /dev/null && pwd`"
#echo -n -e "Processing $PWD...\t"
echo "Processing $PWD..."
(
cd $PWD
if [ "$BASENAME" == "git-config-save" ]; then
git_config_save
else
git_config_restore
fi
)
done
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