## if this file exists.
keep_subject=.dotest/.keep_subject
+## We do not attempt the 3-way merge fallback unless this file exists.
+fall_back_3way=.dotest/.3way
MSGFILE=$1
PATCHFILE=$2
SIGNOFF=$4
EDIT=${VISUAL:-${EDITOR:-vi}}
-export GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' .dotest/info)"
-export GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' .dotest/info)"
-export GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' .dotest/info)"
-export SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' .dotest/info)"
+export GIT_AUTHOR_NAME="$(sed -n '/^Author/ s/Author: //p' "$INFO")"
+export GIT_AUTHOR_EMAIL="$(sed -n '/^Email/ s/Email: //p' "$INFO")"
+export GIT_AUTHOR_DATE="$(sed -n '/^Date/ s/Date: //p' "$INFO")"
+export SUBJECT="$(sed -n '/^Subject/ s/Subject: //p' "$INFO")"
if test '' != "$SIGNOFF"
then
sed -ne '/^Signed-off-by: /p' "$MSGFILE" |
tail -n 1
`
- test "$LAST_SIGNED_OFF_BY" = "$SIGNOFF" ||
- echo "$SIGNOFF" >>"$MSGFILE"
+ test "$LAST_SIGNED_OFF_BY" = "$SIGNOFF" || {
+ test '' = "$LAST_SIGNED_OFF_BY" && echo
+ echo "$SIGNOFF"
+ } >>"$MSGFILE"
fi
fi
echo Applying "'$SUBJECT'"
echo
-git-apply --index "$PATCHFILE" || exit 1
+git-apply --index "$PATCHFILE" || {
+
+ # git-apply exits with status 1 when the patch does not apply,
+ # but it die()s with other failures, most notably upon corrupt
+ # patch. In the latter case, there is no point to try applying
+ # it to another tree and do 3-way merge.
+ test $? = 1 || exit 1
+
+ test -f "$fall_back_3way" || exit 1
+
+ # Here if we know which revision the patch applies to,
+ # we create a temporary working tree and index, apply the
+ # patch, and attempt 3-way merge with the resulting tree.
+
+ O_OBJECT=`cd "$GIT_OBJECT_DIRECTORY" && pwd`
+ rm -fr .patch-merge-*
+
+ (
+ N=10
+
+ # if the patch records the base tree...
+ sed -ne '
+ /^diff /q
+ /^applies-to: \([0-9a-f]*\)$/{
+ s//\1/p
+ q
+ }
+ ' "$PATCHFILE"
+
+ # or hoping the patch is against our recent commits...
+ git-rev-list --max-count=$N HEAD
+
+ # or hoping the patch is against known tags...
+ git-ls-remote --tags .
+ ) |
+ while read base junk
+ do
+ # Try it if we have it as a tree.
+ git-cat-file tree "$base" >/dev/null 2>&1 || continue
+
+ rm -fr .patch-merge-tmp-* &&
+ mkdir .patch-merge-tmp-dir || break
+ (
+ cd .patch-merge-tmp-dir &&
+ GIT_INDEX_FILE=../.patch-merge-tmp-index &&
+ GIT_OBJECT_DIRECTORY="$O_OBJECT" &&
+ export GIT_INDEX_FILE GIT_OBJECT_DIRECTORY &&
+ git-read-tree "$base" &&
+ git-apply --index &&
+ mv ../.patch-merge-tmp-index ../.patch-merge-index &&
+ echo "$base" >../.patch-merge-base
+ ) <"$PATCHFILE" 2>/dev/null && break
+ done
+
+ test -f .patch-merge-index &&
+ his_tree=$(GIT_INDEX_FILE=.patch-merge-index git-write-tree) &&
+ orig_tree=$(cat .patch-merge-base) &&
+ rm -fr .patch-merge-* || exit 1
+
+ echo Falling back to patching base and 3-way merge using $orig_tree...
+
+ # This is not so wrong. Depending on which base we picked,
+ # orig_tree may be wildly different from ours, but his_tree
+ # has the same set of wildly different changes in parts the
+ # patch did not touch, so resolve ends up cancelling them,
+ # saying that we reverted all those changes.
+
+ if git-merge-resolve $orig_tree -- HEAD $his_tree
+ then
+ echo Done.
+ else
+ echo Failed to merge in the changes.
+ exit 1
+ fi
+}
if test -x "$GIT_DIR"/hooks/pre-applypatch
then