+git-sync
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bin/git-sync
Executable file
385
bin/git-sync
Executable file
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#!/usr/bin/env bash
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#
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# git-sync
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#
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# synchronize tracking repositories
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#
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# 2012-20 by Simon Thum and contributors
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# Licensed as: CC0
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#
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# This scrips intends to sync via git near-automatically
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# in "tracking" repositories where a nice history is not
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# crucial, but having one at all is.
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#
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# Unlike the myriad of scripts to do just that already available,
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# it follows the KISS principle: It is small, requires nothing but
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# git and bash, but does not even try to shield you from git.
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#
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# Mode sync (default)
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#
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# Sync will likely get from you from a dull normal git repo with trivial
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# changes to an updated dull normal git repo equal to origin. No more,
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# no less. The intent is to do everything that's needed to sync
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# automatically, and resort to manual intervention as soon
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# as something non-trivial occurs. It is designed to be safe
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# in that it will likely refuse to do anything not known to
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# be safe.
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#
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# Mode check
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#
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# Check only performs the basic checks to make sure the repository
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# is in an orderly state to continue syncing, i.e. committing
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# changes, pull etc. without losing any data. When check returns
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# 0, sync can start immediately. This does not, however, indicate
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# that syncing is at all likely to succeed.
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# command used to auto-commit file modifications
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DEFAULT_AUTOCOMMIT_CMD="git add -u ; git commit -m \"%message\";"
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# command used to auto-commit all changes
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ALL_AUTOCOMMIT_CMD="git add -A ; git commit -m \"%message\";"
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# default commit message substituted into autocommit commands
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DEFAULT_AUTOCOMMIT_MSG="changes from $(uname -n) on $(date)"
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# AUTOCOMMIT_CMD="echo \"Please commit or stash pending changes\"; exit 1;"
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# TODO mode for stash push & pop
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print_usage() {
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cat << EOF
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usage: $0 [-h] [-n] [-s] [MODE]
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Synchronize the current branch to a remote backup
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MODE may be either "sync" (the default) or "check", to verify that the branch is ready to sync
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OPTIONS:
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-h Show this message
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-n Commit new files even if branch.\$branch_name.syncNewFiles isn't set
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-s Sync the branch even if branch.\$branch_name.sync isn't set
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EOF
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}
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sync_new_files_anyway="false"
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sync_anyway="false"
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while getopts "hns" opt ; do
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case $opt in
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h )
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print_usage
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exit 0
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;;
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n )
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sync_new_files_anyway="true"
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;;
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s )
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sync_anyway="true"
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;;
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esac
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done
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shift $((OPTIND-1))
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#
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# utility functions, some adapted from git bash completion
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#
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__log_msg()
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{
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echo git-sync: $1
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}
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# echo the git dir
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__gitdir()
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{
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if [ "true" = "$(git rev-parse --is-inside-work-tree "$PWD" | head -1)" ]; then
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git rev-parse --git-dir "$PWD" 2>/dev/null
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fi
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}
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# echos repo state
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git_repo_state ()
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{
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local g="$(__gitdir)"
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if [ -n "$g" ]; then
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if [ -f "$g/rebase-merge/interactive" ]; then
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echo "REBASE-i"
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elif [ -d "$g/rebase-merge" ]; then
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echo "REBASE-m"
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else
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if [ -d "$g/rebase-apply" ]; then
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echo "AM/REBASE"
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elif [ -f "$g/MERGE_HEAD" ]; then
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echo "MERGING"
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elif [ -f "$g/CHERRY_PICK_HEAD" ]; then
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echo "CHERRY-PICKING"
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elif [ -f "$g/BISECT_LOG" ]; then
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echo "BISECTING"
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fi
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fi
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if [ "true" = "$(git rev-parse --is-inside-git-dir 2>/dev/null)" ]; then
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if [ "true" = "$(git rev-parse --is-bare-repository 2>/dev/null)" ]; then
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echo "|BARE"
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else
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echo "|GIT_DIR"
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fi
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elif [ "true" = "$(git rev-parse --is-inside-work-tree 2>/dev/null)" ]; then
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git diff --no-ext-diff --quiet --exit-code || echo "|DIRTY"
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# if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ]; then
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# git rev-parse --verify refs/stash >/dev/null 2>&1 && s="$"
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# fi
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#
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# if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ]; then
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# if [ -n "$(git ls-files --others --exclude-standard)" ]; then
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# u="%"
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# fi
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# fi
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#
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# if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
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# __git_ps1_show_upstream
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# fi
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fi
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else
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echo "NOGIT"
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fi
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}
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# check if we only have untouched, modified or (if configured) new files
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check_initial_file_state()
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{
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local syncNew="$(git config --get --bool branch.$branch_name.syncNewFiles)"
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if [[ "true" == "$syncNew" || "true" == "$sync_new_files_anyway" ]]; then
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# allow for new files
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if [ ! -z "$(git status --porcelain | grep -E '^[^ \?][^M\?] *')" ]; then
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echo "NonNewOrModified"
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fi
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else
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# also bail on new files
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if [ ! -z "$(git status --porcelain | grep -E '^[^ ][^M] *')" ]; then
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echo "NotOnlyModified"
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fi
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fi
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}
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# look for local changes
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# used to decide if autocommit should be invoked
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local_changes()
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{
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if [ ! -z "$(git status --porcelain | grep -E '^(\?\?|[MARC] |[ MARC][MD])*')" ]; then
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echo "LocalChanges"
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fi
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}
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# determine sync state of repository, i.e. how the remote relates to our HEAD
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sync_state()
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{
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local count="$(git rev-list --count --left-right $remote_name/$branch_name...HEAD)"
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case "$count" in
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"") # no upstream
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echo "noUpstream"
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false
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;;
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"0 0")
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echo "equal"
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true
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;;
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"0 "*)
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echo "ahead"
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true
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;;
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*" 0")
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echo "behind"
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true
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;;
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*)
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echo "diverged"
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true
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;;
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esac
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}
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# exit, issue warning if not in sync
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exit_assuming_sync() {
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if [ "equal" == "$(sync_state)" ] ; then
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__log_msg "In sync, all fine."
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exit 0;
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else
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__log_msg "Synchronization FAILED! You should definitely check your repository carefully!"
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__log_msg "(Possibly a transient network problem? Please try again in that case.)"
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exit 3
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fi
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}
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#
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# Here git-sync actually starts
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#
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# first some sanity checks
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rstate="$(git_repo_state)"
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if [[ -z "$rstate" || "|DIRTY" = "$rstate" ]]; then
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__log_msg "Preparing. Repo in $(__gitdir)"
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elif [[ "NOGIT" = "$rstate" ]] ; then
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__log_msg "No git repository detected. Exiting."
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exit 128 # matches git's error code
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else
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__log_msg "Git repo state considered unsafe for sync: $(git_repo_state)"
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exit 2
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fi
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# determine the current branch (thanks to stackoverflow)
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branch_name=$(git symbolic-ref -q HEAD)
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branch_name=${branch_name##refs/heads/}
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if [ -z "$branch_name" ] ; then
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__log_msg "Syncing is only possible on a branch."
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git status
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exit 2
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fi
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# while at it, determine the remote to operate on
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remote_name=$(git config --get branch.$branch_name.pushRemote)
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if [ -z "$remote_name" ] ; then
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remote_name=$(git config --get remote.pushDefault)
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fi
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if [ -z "$remote_name" ] ; then
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remote_name=$(git config --get branch.$branch_name.remote)
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fi
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if [ -z "$remote_name" ] ; then
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__log_msg "the current branch does not have a configured remote."
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echo
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__log_msg "Please use"
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echo
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__log_msg " git branch --set-upstream-to=[remote_name]/$branch_name"
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echo
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__log_msg "replacing [remote_name] with the name of your remote, i.e. - origin"
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__log_msg "to set the remote tracking branch for git-sync to work"
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exit 2
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fi
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# check if current branch is configured for sync
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if [[ "true" != "$(git config --get --bool branch.$branch_name.sync)" && "true" != "$sync_anyway" ]] ; then
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echo
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__log_msg "Please use"
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echo
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__log_msg " git config --bool branch.$branch_name.sync true"
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echo
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__log_msg "to enlist branch $branch_name for synchronization."
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__log_msg "Branch $branch_name has to have a same-named remote branch"
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__log_msg "for git-sync to work."
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echo
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__log_msg "(If you don't know what this means, you should change that"
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__log_msg "before relying on this script. You have been warned.)"
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echo
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exit 1
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fi
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# determine mode
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if [[ -z "$1" || "$1" == "sync" ]]; then
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mode="sync"
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elif [[ "check" == "$1" ]]; then
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mode="check"
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else
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__log_msg "Mode $1 not recognized"
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exit 100
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fi
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__log_msg "Mode $mode"
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__log_msg "Using $remote_name/$branch_name"
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# check for intentionally unhandled file states
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if [ ! -z "$(check_initial_file_state)" ] ; then
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__log_msg "There are changed files you should probably handle manually."
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git status
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exit 1
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fi
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# if in check mode, this is all we need to know
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if [ $mode == "check" ] ; then
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__log_msg "check OK; sync may start."
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exit 0
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fi
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# check if we have to commit local changes, if yes, do so
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if [ ! -z "$(local_changes)" ]; then
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autocommit_cmd=""
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config_autocommit_cmd="$(git config --get branch.$branch_name.autocommitscript)"
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# discern the three ways to auto-commit
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if [ ! -z "$config_autocommit_cmd" ]; then
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autocommit_cmd="$config_autocommit_cmd"
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elif [[ "true" == "$(git config --get --bool branch.$branch_name.syncNewFiles)" || "true" == "$sync_new_files_anyway" ]]; then
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autocommit_cmd=${ALL_AUTOCOMMIT_CMD}
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else
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autocommit_cmd=${DEFAULT_AUTOCOMMIT_CMD}
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fi
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commit_msg="$(git config --get branch.$branch_name.syncCommitMsg)"
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if [ "" == "$commit_msg" ]; then
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commit_msg=${DEFAULT_AUTOCOMMIT_MSG}
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fi
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autocommit_cmd=$(echo "$autocommit_cmd" | sed "s/%message/$commit_msg/")
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__log_msg "Committing local changes using ${autocommit_cmd}"
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eval $autocommit_cmd
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# after autocommit, we should be clean
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rstate="$(git_repo_state)"
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if [[ ! -z "$rstate" ]]; then
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__log_msg "Auto-commit left uncommitted changes. Please add or remove them as desired and retry."
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exit 1
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fi
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fi
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# fetch remote to get to the current sync state
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# TODO make fetching/pushing optional
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__log_msg "Fetching from $remote_name/$branch_name"
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git fetch $remote_name $branch_name
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if [ $? != 0 ] ; then
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__log_msg "git fetch $remote_name returned non-zero. Likely a network problem; exiting."
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exit 3
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fi
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case "$(sync_state)" in
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"noUpstream")
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__log_msg "Strange state, you're on your own. Good luck."
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exit 2
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;;
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"equal")
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exit_assuming_sync
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;;
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"ahead")
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__log_msg "Pushing changes..."
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git push $remote_name $branch_name:$branch_name
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if [ $? == 0 ]; then
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exit_assuming_sync
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else
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__log_msg "git push returned non-zero. Likely a connection failure."
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exit 3
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fi
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;;
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"behind")
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__log_msg "We are behind, fast-forwarding..."
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git merge --ff --ff-only $remote_name/$branch_name
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if [ $? == 0 ]; then
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exit_assuming_sync
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else
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__log_msg "git merge --ff --ff-only returned non-zero ($?). Exiting."
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exit 2
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fi
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;;
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"diverged")
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__log_msg "We have diverged. Trying to rebase..."
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git rebase $remote_name/$branch_name
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if [[ $? == 0 && -z "$(git_repo_state)" && "ahead" == "$(sync_state)" ]] ; then
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__log_msg "Rebasing went fine, pushing..."
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git push $remote_name $branch_name:$branch_name
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exit_assuming_sync
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else
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__log_msg "Rebasing failed, likely there are conflicting changes. Resolve them and finish the rebase before repeating git-sync."
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exit 1
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fi
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# TODO: save master, if rebasing fails, make a branch of old master
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;;
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esac
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