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d64e6b0429
"empty ident not allowed" error makes commit-tree fail, so we are already safer in that we would not end up with commit objects that have bogus names on the author or committer fields. However, before commit-tree is called there are already changes made to the index file and the working tree. The operation can be resumed after fixing the environment problem, but when this triggers to a newcomer with unusable gecos, the first question becomes "what did I lose and how would I recover". This patch modifies some Porcelainish commands to verify GIT_COMMITTER_IDENT as soon as we know we are going to make some commits before doing much damage to prevent confusion. Signed-off-by: Junio C Hamano <junkio@cox.net>
326 lines
6.9 KiB
Bash
Executable file
326 lines
6.9 KiB
Bash
Executable file
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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USAGE='[-n] [--no-commit] [-s <strategy>]... <merge-message> <head> <remote>+'
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. git-sh-setup
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LF='
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'
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all_strategies='recursive octopus resolve stupid ours'
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default_strategies='recursive'
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use_strategies=
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if test "@@NO_PYTHON@@"; then
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all_strategies='resolve octopus stupid ours'
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default_strategies='resolve'
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fi
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dropsave() {
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rm -f -- "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/MERGE_MSG" \
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"$GIT_DIR/MERGE_SAVE" || exit 1
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}
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savestate() {
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# Stash away any local modifications.
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git-diff-index -z --name-only $head |
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cpio -0 -o >"$GIT_DIR/MERGE_SAVE"
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}
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restorestate() {
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if test -f "$GIT_DIR/MERGE_SAVE"
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then
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git reset --hard $head
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cpio -iuv <"$GIT_DIR/MERGE_SAVE"
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git-update-index --refresh >/dev/null
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fi
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}
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finish () {
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test '' = "$2" || echo "$2"
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case "$merge_msg" in
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'')
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echo "No merge message -- not updating HEAD"
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;;
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*)
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git-update-ref HEAD "$1" "$head" || exit 1
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;;
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esac
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case "$no_summary" in
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'')
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git-diff-tree -p -M "$head" "$1" |
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git-apply --stat --summary
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;;
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esac
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}
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while case "$#" in 0) break ;; esac
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do
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case "$1" in
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-n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
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--no-summa|--no-summar|--no-summary)
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no_summary=t ;;
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--no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
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no_commit=t ;;
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-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
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--strateg=*|--strategy=*|\
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-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
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case "$#,$1" in
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*,*=*)
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strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
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1,*)
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usage ;;
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*)
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strategy="$2"
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shift ;;
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esac
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case " $all_strategies " in
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*" $strategy "*)
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use_strategies="$use_strategies$strategy " ;;
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*)
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die "available strategies are: $all_strategies" ;;
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esac
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;;
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-*) usage ;;
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*) break ;;
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esac
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shift
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done
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test "$#" -le 2 && usage ;# we need at least two heads.
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merge_msg="$1"
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shift
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head_arg="$1"
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head=$(git-rev-parse --verify "$1"^0) || usage
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shift
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# All the rest are remote heads
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remoteheads=
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for remote
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do
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remotehead=$(git-rev-parse --verify "$remote"^0) ||
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die "$remote - not something we can merge"
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remoteheads="${remoteheads}$remotehead "
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done
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set x $remoteheads ; shift
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case "$#" in
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1)
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common=$(git-merge-base --all $head "$@")
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;;
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*)
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common=$(git-show-branch --merge-base $head "$@")
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;;
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esac
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echo "$head" >"$GIT_DIR/ORIG_HEAD"
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case "$#,$common,$no_commit" in
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*,'',*)
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# No common ancestors found. We need a real merge.
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;;
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1,"$1",*)
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# If head can reach all the merge then we are up to date.
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# but first the most common case of merging one remote
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echo "Already up-to-date."
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dropsave
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exit 0
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;;
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1,"$head",*)
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# Again the most common case of merging one remote.
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echo "Updating from $head to $1."
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git-update-index --refresh 2>/dev/null
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new_head=$(git-rev-parse --verify "$1^0") &&
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git-read-tree -u -m $head "$new_head" &&
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finish "$new_head" "Fast forward"
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dropsave
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exit 0
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;;
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1,?*"$LF"?*,*)
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# We are not doing octopus and not fast forward. Need a
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# real merge.
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;;
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1,*,)
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# We are not doing octopus, not fast forward, and have only
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# one common. See if it is really trivial.
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git var GIT_COMMITTER_IDENT >/dev/null || exit
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echo "Trying really trivial in-index merge..."
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git-update-index --refresh 2>/dev/null
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if git-read-tree --trivial -m -u $common $head "$1" &&
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result_tree=$(git-write-tree)
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then
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echo "Wonderful."
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result_commit=$(
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echo "$merge_msg" |
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git-commit-tree $result_tree -p HEAD -p "$1"
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) || exit
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finish "$result_commit" "In-index merge"
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dropsave
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exit 0
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fi
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echo "Nope."
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;;
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*)
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# An octopus. If we can reach all the remote we are up to date.
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up_to_date=t
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for remote
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do
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common_one=$(git-merge-base --all $head $remote)
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if test "$common_one" != "$remote"
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then
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up_to_date=f
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break
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fi
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done
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if test "$up_to_date" = t
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then
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echo "Already up-to-date. Yeeah!"
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dropsave
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exit 0
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fi
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;;
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esac
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# We are going to make a new commit.
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git var GIT_COMMITTER_IDENT >/dev/null || exit
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case "$use_strategies" in
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'')
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case "$#" in
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1)
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use_strategies="$default_strategies" ;;
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*)
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use_strategies=octopus ;;
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esac
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;;
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esac
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# At this point, we need a real merge. No matter what strategy
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# we use, it would operate on the index, possibly affecting the
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# working tree, and when resolved cleanly, have the desired tree
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# in the index -- this means that the index must be in sync with
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# the $head commit. The strategies are responsible to ensure this.
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case "$use_strategies" in
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?*' '?*)
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# Stash away the local changes so that we can try more than one.
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savestate
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single_strategy=no
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;;
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*)
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rm -f "$GIT_DIR/MERGE_SAVE"
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single_strategy=yes
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;;
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esac
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result_tree= best_cnt=-1 best_strategy= wt_strategy=
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merge_was_ok=
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for strategy in $use_strategies
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do
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test "$wt_strategy" = '' || {
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echo "Rewinding the tree to pristine..."
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restorestate
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}
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case "$single_strategy" in
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no)
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echo "Trying merge strategy $strategy..."
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;;
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esac
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# Remember which strategy left the state in the working tree
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wt_strategy=$strategy
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git-merge-$strategy $common -- "$head_arg" "$@"
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exit=$?
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if test "$no_commit" = t && test "$exit" = 0
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then
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merge_was_ok=t
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exit=1 ;# pretend it left conflicts.
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fi
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test "$exit" = 0 || {
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# The backend exits with 1 when conflicts are left to be resolved,
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# with 2 when it does not handle the given merge at all.
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if test "$exit" -eq 1
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then
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cnt=`{
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git-diff-files --name-only
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git-ls-files --unmerged
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} | wc -l`
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if test $best_cnt -le 0 -o $cnt -le $best_cnt
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then
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best_strategy=$strategy
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best_cnt=$cnt
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fi
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fi
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continue
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}
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# Automerge succeeded.
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result_tree=$(git-write-tree) && break
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done
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# If we have a resulting tree, that means the strategy module
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# auto resolved the merge cleanly.
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if test '' != "$result_tree"
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then
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parents="-p $head"
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for remote
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do
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parents="$parents -p $remote"
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done
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result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree $parents) || exit
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finish "$result_commit" "Merge $result_commit, made by $wt_strategy."
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dropsave
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exit 0
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fi
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# Pick the result from the best strategy and have the user fix it up.
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case "$best_strategy" in
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'')
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restorestate
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echo >&2 "No merge strategy handled the merge."
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exit 2
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;;
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"$wt_strategy")
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# We already have its result in the working tree.
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;;
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*)
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echo "Rewinding the tree to pristine..."
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restorestate
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echo "Using the $best_strategy to prepare resolving by hand."
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git-merge-$best_strategy $common -- "$head_arg" "$@"
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;;
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esac
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for remote
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do
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echo $remote
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done >"$GIT_DIR/MERGE_HEAD"
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echo "$merge_msg" >"$GIT_DIR/MERGE_MSG"
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if test "$merge_was_ok" = t
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then
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echo >&2 \
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"Automatic merge went well; stopped before committing as requested"
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exit 0
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else
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{
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echo '
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Conflicts:
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'
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git ls-files --unmerged |
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sed -e 's/^[^ ]* / /' |
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uniq
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} >>"$GIT_DIR/MERGE_MSG"
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if test -d "$GIT_DIR/rr-cache"
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then
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git-rerere
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fi
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die "Automatic merge failed; fix up by hand"
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fi
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