726 lines
15 KiB
Bash
Executable File
726 lines
15 KiB
Bash
Executable File
#!/bin/sh
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#
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# git-subtree.sh: split/join git repositories in subdirectories of this one
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#
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# Copyright (C) 2009 Avery Pennarun <apenwarr@gmail.com>
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#
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if [ $# -eq 0 ]; then
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set -- -h
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fi
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OPTS_SPEC="\
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git subtree add --prefix=<prefix> <commit>
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git subtree add --prefix=<prefix> <repository> <commit>
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git subtree merge --prefix=<prefix> <commit>
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git subtree pull --prefix=<prefix> <repository> <refspec...>
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git subtree push --prefix=<prefix> <repository> <refspec...>
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git subtree split --prefix=<prefix> <commit...>
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--
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h,help show the help
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q quiet
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d show debug messages
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P,prefix= the name of the subdir to split out
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m,message= use the given message as the commit message for the merge commit
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options for 'split'
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annotate= add a prefix to commit message of new commits
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b,branch= create a new branch from the split subtree
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ignore-joins ignore prior --rejoin commits
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onto= try connecting new tree to an existing one
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rejoin merge the new branch back into HEAD
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options for 'add', 'merge', 'pull' and 'push'
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squash merge subtree changes as a single commit
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"
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eval "$(echo "$OPTS_SPEC" | git rev-parse --parseopt -- "$@" || echo exit $?)"
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PATH=$PATH:$(git --exec-path)
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. git-sh-setup
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require_work_tree
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quiet=
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branch=
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debug=
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command=
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onto=
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rejoin=
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ignore_joins=
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annotate=
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squash=
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message=
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debug()
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{
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if [ -n "$debug" ]; then
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echo "$@" >&2
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fi
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}
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say()
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{
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if [ -z "$quiet" ]; then
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echo "$@" >&2
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fi
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}
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assert()
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{
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if "$@"; then
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:
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else
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die "assertion failed: " "$@"
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fi
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}
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#echo "Options: $*"
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while [ $# -gt 0 ]; do
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opt="$1"
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shift
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case "$opt" in
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-q) quiet=1 ;;
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-d) debug=1 ;;
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--annotate) annotate="$1"; shift ;;
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--no-annotate) annotate= ;;
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-b) branch="$1"; shift ;;
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-P) prefix="$1"; shift ;;
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-m) message="$1"; shift ;;
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--no-prefix) prefix= ;;
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--onto) onto="$1"; shift ;;
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--no-onto) onto= ;;
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--rejoin) rejoin=1 ;;
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--no-rejoin) rejoin= ;;
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--ignore-joins) ignore_joins=1 ;;
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--no-ignore-joins) ignore_joins= ;;
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--squash) squash=1 ;;
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--no-squash) squash= ;;
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--) break ;;
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*) die "Unexpected option: $opt" ;;
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esac
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done
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command="$1"
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shift
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case "$command" in
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add|merge|pull) default= ;;
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split|push) default="--default HEAD" ;;
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*) die "Unknown command '$command'" ;;
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esac
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if [ -z "$prefix" ]; then
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die "You must provide the --prefix option."
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fi
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case "$command" in
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add) [ -e "$prefix" ] &&
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die "prefix '$prefix' already exists." ;;
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*) [ -e "$prefix" ] ||
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die "'$prefix' does not exist; use 'git subtree add'" ;;
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esac
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dir="$(dirname "$prefix/.")"
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if [ "$command" != "pull" -a "$command" != "add" -a "$command" != "push" ]; then
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revs=$(git rev-parse $default --revs-only "$@") || exit $?
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dirs="$(git rev-parse --no-revs --no-flags "$@")" || exit $?
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if [ -n "$dirs" ]; then
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die "Error: Use --prefix instead of bare filenames."
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fi
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fi
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debug "command: {$command}"
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debug "quiet: {$quiet}"
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debug "revs: {$revs}"
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debug "dir: {$dir}"
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debug "opts: {$*}"
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debug
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cache_setup()
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{
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cachedir="$GIT_DIR/subtree-cache/$$"
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rm -rf "$cachedir" || die "Can't delete old cachedir: $cachedir"
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mkdir -p "$cachedir" || die "Can't create new cachedir: $cachedir"
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mkdir -p "$cachedir/notree" || die "Can't create new cachedir: $cachedir/notree"
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debug "Using cachedir: $cachedir" >&2
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}
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cache_get()
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{
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for oldrev in $*; do
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if [ -r "$cachedir/$oldrev" ]; then
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read newrev <"$cachedir/$oldrev"
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echo $newrev
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fi
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done
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}
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cache_miss()
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{
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for oldrev in $*; do
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if [ ! -r "$cachedir/$oldrev" ]; then
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echo $oldrev
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fi
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done
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}
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check_parents()
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{
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missed=$(cache_miss $*)
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for miss in $missed; do
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if [ ! -r "$cachedir/notree/$miss" ]; then
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debug " incorrect order: $miss"
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fi
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done
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}
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set_notree()
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{
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echo "1" > "$cachedir/notree/$1"
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}
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cache_set()
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{
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oldrev="$1"
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newrev="$2"
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if [ "$oldrev" != "latest_old" \
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-a "$oldrev" != "latest_new" \
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-a -e "$cachedir/$oldrev" ]; then
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die "cache for $oldrev already exists!"
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fi
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echo "$newrev" >"$cachedir/$oldrev"
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}
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rev_exists()
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{
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if git rev-parse "$1" >/dev/null 2>&1; then
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return 0
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else
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return 1
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fi
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}
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rev_is_descendant_of_branch()
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{
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newrev="$1"
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branch="$2"
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branch_hash=$(git rev-parse $branch)
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match=$(git rev-list -1 $branch_hash ^$newrev)
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if [ -z "$match" ]; then
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return 0
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else
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return 1
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fi
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}
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# if a commit doesn't have a parent, this might not work. But we only want
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# to remove the parent from the rev-list, and since it doesn't exist, it won't
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# be there anyway, so do nothing in that case.
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try_remove_previous()
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{
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if rev_exists "$1^"; then
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echo "^$1^"
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fi
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}
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find_latest_squash()
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{
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debug "Looking for latest squash ($dir)..."
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dir="$1"
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sq=
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main=
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sub=
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git log --grep="^git-subtree-dir: $dir/*\$" \
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--pretty=format:'START %H%n%s%n%n%b%nEND%n' HEAD |
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while read a b junk; do
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debug "$a $b $junk"
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debug "{{$sq/$main/$sub}}"
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case "$a" in
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START) sq="$b" ;;
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git-subtree-mainline:) main="$b" ;;
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git-subtree-split:) sub="$b" ;;
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END)
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if [ -n "$sub" ]; then
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if [ -n "$main" ]; then
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# a rejoin commit?
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# Pretend its sub was a squash.
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sq="$sub"
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fi
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debug "Squash found: $sq $sub"
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echo "$sq" "$sub"
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break
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fi
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sq=
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main=
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sub=
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;;
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esac
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done
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}
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find_existing_splits()
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{
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debug "Looking for prior splits..."
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dir="$1"
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revs="$2"
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main=
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sub=
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git log --grep="^git-subtree-dir: $dir/*\$" \
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--pretty=format:'START %H%n%s%n%n%b%nEND%n' $revs |
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while read a b junk; do
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case "$a" in
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START) sq="$b" ;;
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git-subtree-mainline:) main="$b" ;;
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git-subtree-split:) sub="$b" ;;
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END)
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debug " Main is: '$main'"
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if [ -z "$main" -a -n "$sub" ]; then
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# squash commits refer to a subtree
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debug " Squash: $sq from $sub"
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cache_set "$sq" "$sub"
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fi
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if [ -n "$main" -a -n "$sub" ]; then
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debug " Prior: $main -> $sub"
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cache_set $main $sub
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cache_set $sub $sub
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try_remove_previous "$main"
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try_remove_previous "$sub"
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fi
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main=
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sub=
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;;
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esac
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done
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}
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copy_commit()
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{
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# We're going to set some environment vars here, so
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# do it in a subshell to get rid of them safely later
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debug copy_commit "{$1}" "{$2}" "{$3}"
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git log -1 --pretty=format:'%an%n%ae%n%ad%n%cn%n%ce%n%cd%n%B' "$1" |
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(
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read GIT_AUTHOR_NAME
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read GIT_AUTHOR_EMAIL
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read GIT_AUTHOR_DATE
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read GIT_COMMITTER_NAME
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read GIT_COMMITTER_EMAIL
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read GIT_COMMITTER_DATE
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export GIT_AUTHOR_NAME \
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GIT_AUTHOR_EMAIL \
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GIT_AUTHOR_DATE \
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GIT_COMMITTER_NAME \
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GIT_COMMITTER_EMAIL \
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GIT_COMMITTER_DATE
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(printf "%s" "$annotate"; cat ) |
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git commit-tree "$2" $3 # reads the rest of stdin
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) || die "Can't copy commit $1"
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}
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add_msg()
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{
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dir="$1"
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latest_old="$2"
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latest_new="$3"
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if [ -n "$message" ]; then
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commit_message="$message"
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else
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commit_message="Add '$dir/' from commit '$latest_new'"
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fi
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cat <<-EOF
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$commit_message
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git-subtree-dir: $dir
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git-subtree-mainline: $latest_old
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git-subtree-split: $latest_new
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EOF
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}
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add_squashed_msg()
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{
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if [ -n "$message" ]; then
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echo "$message"
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else
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echo "Merge commit '$1' as '$2'"
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fi
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}
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rejoin_msg()
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{
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dir="$1"
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latest_old="$2"
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latest_new="$3"
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if [ -n "$message" ]; then
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commit_message="$message"
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else
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commit_message="Split '$dir/' into commit '$latest_new'"
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fi
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cat <<-EOF
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$commit_message
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git-subtree-dir: $dir
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git-subtree-mainline: $latest_old
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git-subtree-split: $latest_new
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EOF
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}
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squash_msg()
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{
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dir="$1"
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oldsub="$2"
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newsub="$3"
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newsub_short=$(git rev-parse --short "$newsub")
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if [ -n "$oldsub" ]; then
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oldsub_short=$(git rev-parse --short "$oldsub")
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echo "Squashed '$dir/' changes from $oldsub_short..$newsub_short"
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echo
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git log --pretty=tformat:'%h %s' "$oldsub..$newsub"
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git log --pretty=tformat:'REVERT: %h %s' "$newsub..$oldsub"
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else
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echo "Squashed '$dir/' content from commit $newsub_short"
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fi
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echo
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echo "git-subtree-dir: $dir"
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echo "git-subtree-split: $newsub"
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}
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toptree_for_commit()
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{
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commit="$1"
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git log -1 --pretty=format:'%T' "$commit" -- || exit $?
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}
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subtree_for_commit()
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{
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commit="$1"
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dir="$2"
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git ls-tree "$commit" -- "$dir" |
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while read mode type tree name; do
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assert [ "$name" = "$dir" ]
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assert [ "$type" = "tree" -o "$type" = "commit" ]
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[ "$type" = "commit" ] && continue # ignore submodules
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echo $tree
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break
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done
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}
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tree_changed()
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{
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tree=$1
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shift
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if [ $# -ne 1 ]; then
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return 0 # weird parents, consider it changed
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else
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ptree=$(toptree_for_commit $1)
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if [ "$ptree" != "$tree" ]; then
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return 0 # changed
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else
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return 1 # not changed
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fi
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fi
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}
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new_squash_commit()
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{
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old="$1"
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oldsub="$2"
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newsub="$3"
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tree=$(toptree_for_commit $newsub) || exit $?
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if [ -n "$old" ]; then
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squash_msg "$dir" "$oldsub" "$newsub" |
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git commit-tree "$tree" -p "$old" || exit $?
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else
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squash_msg "$dir" "" "$newsub" |
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git commit-tree "$tree" || exit $?
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fi
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}
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copy_or_skip()
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{
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rev="$1"
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tree="$2"
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newparents="$3"
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assert [ -n "$tree" ]
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identical=
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nonidentical=
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p=
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gotparents=
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for parent in $newparents; do
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ptree=$(toptree_for_commit $parent) || exit $?
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[ -z "$ptree" ] && continue
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if [ "$ptree" = "$tree" ]; then
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# an identical parent could be used in place of this rev.
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identical="$parent"
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else
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nonidentical="$parent"
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fi
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# sometimes both old parents map to the same newparent;
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# eliminate duplicates
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is_new=1
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for gp in $gotparents; do
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if [ "$gp" = "$parent" ]; then
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is_new=
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break
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fi
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done
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if [ -n "$is_new" ]; then
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gotparents="$gotparents $parent"
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p="$p -p $parent"
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fi
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done
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if [ -n "$identical" ]; then
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echo $identical
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else
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copy_commit $rev $tree "$p" || exit $?
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fi
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}
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ensure_clean()
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{
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if ! git diff-index HEAD --exit-code --quiet 2>&1; then
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die "Working tree has modifications. Cannot add."
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fi
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if ! git diff-index --cached HEAD --exit-code --quiet 2>&1; then
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die "Index has modifications. Cannot add."
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fi
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}
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cmd_add()
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{
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if [ -e "$dir" ]; then
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die "'$dir' already exists. Cannot add."
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fi
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ensure_clean
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if [ $# -eq 1 ]; then
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git rev-parse -q --verify "$1^{commit}" >/dev/null ||
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die "'$1' does not refer to a commit"
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"cmd_add_commit" "$@"
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elif [ $# -eq 2 ]; then
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# Technically we could accept a refspec here but we're
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# just going to turn around and add FETCH_HEAD under the
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# specified directory. Allowing a refspec might be
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# misleading because we won't do anything with any other
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# branches fetched via the refspec.
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git rev-parse -q --verify "$2^{commit}" >/dev/null ||
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die "'$2' does not refer to a commit"
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"cmd_add_repository" "$@"
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else
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say "error: parameters were '$@'"
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die "Provide either a commit or a repository and commit."
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fi
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}
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cmd_add_repository()
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{
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echo "git fetch" "$@"
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repository=$1
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refspec=$2
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git fetch "$@" || exit $?
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revs=FETCH_HEAD
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set -- $revs
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cmd_add_commit "$@"
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}
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cmd_add_commit()
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{
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revs=$(git rev-parse $default --revs-only "$@") || exit $?
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set -- $revs
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rev="$1"
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debug "Adding $dir as '$rev'..."
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git read-tree --prefix="$dir" $rev || exit $?
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git checkout -- "$dir" || exit $?
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tree=$(git write-tree) || exit $?
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headrev=$(git rev-parse HEAD) || exit $?
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if [ -n "$headrev" -a "$headrev" != "$rev" ]; then
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headp="-p $headrev"
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else
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headp=
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fi
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if [ -n "$squash" ]; then
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rev=$(new_squash_commit "" "" "$rev") || exit $?
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commit=$(add_squashed_msg "$rev" "$dir" |
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git commit-tree $tree $headp -p "$rev") || exit $?
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else
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commit=$(add_msg "$dir" "$headrev" "$rev" |
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git commit-tree $tree $headp -p "$rev") || exit $?
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fi
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git reset "$commit" || exit $?
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say "Added dir '$dir'"
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}
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cmd_split()
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{
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debug "Splitting $dir..."
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cache_setup || exit $?
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if [ -n "$onto" ]; then
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debug "Reading history for --onto=$onto..."
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git rev-list $onto |
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while read rev; do
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# the 'onto' history is already just the subdir, so
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# any parent we find there can be used verbatim
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debug " cache: $rev"
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cache_set $rev $rev
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done
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fi
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if [ -n "$ignore_joins" ]; then
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unrevs=
|
|
else
|
|
unrevs="$(find_existing_splits "$dir" "$revs")"
|
|
fi
|
|
|
|
# We can't restrict rev-list to only $dir here, because some of our
|
|
# parents have the $dir contents the root, and those won't match.
|
|
# (and rev-list --follow doesn't seem to solve this)
|
|
grl='git rev-list --topo-order --reverse --parents $revs $unrevs'
|
|
revmax=$(eval "$grl" | wc -l)
|
|
revcount=0
|
|
createcount=0
|
|
eval "$grl" |
|
|
while read rev parents; do
|
|
revcount=$(($revcount + 1))
|
|
say -n "$revcount/$revmax ($createcount)
|
|
"
|
|
debug "Processing commit: $rev"
|
|
exists=$(cache_get $rev)
|
|
if [ -n "$exists" ]; then
|
|
debug " prior: $exists"
|
|
continue
|
|
fi
|
|
createcount=$(($createcount + 1))
|
|
debug " parents: $parents"
|
|
newparents=$(cache_get $parents)
|
|
debug " newparents: $newparents"
|
|
|
|
tree=$(subtree_for_commit $rev "$dir")
|
|
debug " tree is: $tree"
|
|
|
|
check_parents $parents
|
|
|
|
# ugly. is there no better way to tell if this is a subtree
|
|
# vs. a mainline commit? Does it matter?
|
|
if [ -z $tree ]; then
|
|
set_notree $rev
|
|
if [ -n "$newparents" ]; then
|
|
cache_set $rev $rev
|
|
fi
|
|
continue
|
|
fi
|
|
|
|
newrev=$(copy_or_skip "$rev" "$tree" "$newparents") || exit $?
|
|
debug " newrev is: $newrev"
|
|
cache_set $rev $newrev
|
|
cache_set latest_new $newrev
|
|
cache_set latest_old $rev
|
|
done || exit $?
|
|
latest_new=$(cache_get latest_new)
|
|
if [ -z "$latest_new" ]; then
|
|
die "No new revisions were found"
|
|
fi
|
|
|
|
if [ -n "$rejoin" ]; then
|
|
debug "Merging split branch into HEAD..."
|
|
latest_old=$(cache_get latest_old)
|
|
git merge -s ours \
|
|
-m "$(rejoin_msg $dir $latest_old $latest_new)" \
|
|
$latest_new >&2 || exit $?
|
|
fi
|
|
if [ -n "$branch" ]; then
|
|
if rev_exists "refs/heads/$branch"; then
|
|
if ! rev_is_descendant_of_branch $latest_new $branch; then
|
|
die "Branch '$branch' is not an ancestor of commit '$latest_new'."
|
|
fi
|
|
action='Updated'
|
|
else
|
|
action='Created'
|
|
fi
|
|
git update-ref -m 'subtree split' "refs/heads/$branch" $latest_new || exit $?
|
|
say "$action branch '$branch'"
|
|
fi
|
|
echo $latest_new
|
|
exit 0
|
|
}
|
|
|
|
cmd_merge()
|
|
{
|
|
revs=$(git rev-parse $default --revs-only "$@") || exit $?
|
|
ensure_clean
|
|
|
|
set -- $revs
|
|
if [ $# -ne 1 ]; then
|
|
die "You must provide exactly one revision. Got: '$revs'"
|
|
fi
|
|
rev="$1"
|
|
|
|
if [ -n "$squash" ]; then
|
|
first_split="$(find_latest_squash "$dir")"
|
|
if [ -z "$first_split" ]; then
|
|
die "Can't squash-merge: '$dir' was never added."
|
|
fi
|
|
set $first_split
|
|
old=$1
|
|
sub=$2
|
|
if [ "$sub" = "$rev" ]; then
|
|
say "Subtree is already at commit $rev."
|
|
exit 0
|
|
fi
|
|
new=$(new_squash_commit "$old" "$sub" "$rev") || exit $?
|
|
debug "New squash commit: $new"
|
|
rev="$new"
|
|
fi
|
|
|
|
version=$(git version)
|
|
if [ "$version" \< "git version 1.7" ]; then
|
|
if [ -n "$message" ]; then
|
|
git merge -s subtree --message="$message" $rev
|
|
else
|
|
git merge -s subtree $rev
|
|
fi
|
|
else
|
|
if [ -n "$message" ]; then
|
|
git merge -Xsubtree="$prefix" --message="$message" $rev
|
|
else
|
|
git merge -Xsubtree="$prefix" $rev
|
|
fi
|
|
fi
|
|
}
|
|
|
|
cmd_pull()
|
|
{
|
|
ensure_clean
|
|
git fetch "$@" || exit $?
|
|
revs=FETCH_HEAD
|
|
set -- $revs
|
|
cmd_merge "$@"
|
|
}
|
|
|
|
cmd_push()
|
|
{
|
|
if [ $# -ne 2 ]; then
|
|
die "You must provide <repository> <refspec>"
|
|
fi
|
|
if [ -e "$dir" ]; then
|
|
repository=$1
|
|
refspec=$2
|
|
echo "git push using: " $repository $refspec
|
|
localrev=$(git subtree split --prefix="$prefix") || die
|
|
git push $repository $localrev:refs/heads/$refspec
|
|
else
|
|
die "'$dir' must already exist. Try 'git subtree add'."
|
|
fi
|
|
}
|
|
|
|
"cmd_$command" "$@"
|