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#!/bin/sh
##
## applypatch takes four file arguments, and uses those to
## apply the unpacked patch (surprise surprise) that they
## represent to the current tree.
##
## The arguments are:
## $1 - file with commit message
## $2 - file with the actual patch
## $3 - "info" file with Author, email and subject
## $4 - optional file containing signoff to add
##
. git-sh-setup || die "Not a git archive."

final=.dotest/final-commit
##
## If this file exists, we ask before applying
##
query_apply=.dotest/.query_apply

## We do not munge the first line of the commit message too much
## 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
INFO=$3
SIGNOFF=$4
EDIT=${VISUAL:-${EDITOR:-vi}}

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 '' != "$SIGNOFF"
then
if test -f "$SIGNOFF"
then
SIGNOFF=`cat "$SIGNOFF"` || exit
elif case "$SIGNOFF" in yes | true | me | please) : ;; *) false ;; esac
then
SIGNOFF=`git-var GIT_COMMITTER_IDENT | sed -e '
s/>.*/>/
s/^/Signed-off-by: /'
`
else
SIGNOFF=
fi
if test '' != "$SIGNOFF"
then
LAST_SIGNED_OFF_BY=`
sed -ne '/^Signed-off-by: /p' "$MSGFILE" |
tail -n 1
`
test "$LAST_SIGNED_OFF_BY" = "$SIGNOFF" || {
test '' = "$LAST_SIGNED_OFF_BY" && echo
echo "$SIGNOFF"
} >>"$MSGFILE"
fi
fi

patch_header=
test -f "$keep_subject" || patch_header='[PATCH] '

{
echo "$patch_header$SUBJECT"
if test -s "$MSGFILE"
then
echo
cat "$MSGFILE"
fi
} >"$final"

interactive=yes
test -f "$query_apply" || interactive=no

while [ "$interactive" = yes ]; do
echo "Commit Body is:"
echo "--------------------------"
cat "$final"
echo "--------------------------"
echo -n "Apply? [y]es/[n]o/[e]dit/[a]ccept all "
read reply
case "$reply" in
y|Y) interactive=no;;
n|N) exit 2;; # special value to tell dotest to keep going
e|E) "$EDIT" "$final";;
a|A) rm -f "$query_apply"
interactive=no ;;
esac
done

if test -x "$GIT_DIR"/hooks/applypatch-msg
then
"$GIT_DIR"/hooks/applypatch-msg "$final" || exit
fi

echo
echo Applying "'$SUBJECT'"
echo

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 "$GIT_DIR"/hooks/pre-applypatch
then
"$GIT_DIR"/hooks/pre-applypatch || exit
fi

tree=$(git-write-tree) || exit 1
echo Wrote tree $tree
parent=$(git-rev-parse --verify HEAD) &&
commit=$(git-commit-tree $tree -p $parent <"$final") || exit 1
echo Committed: $commit
git-update-ref HEAD $commit $parent || exit

if test -x "$GIT_DIR"/hooks/post-applypatch
then
"$GIT_DIR"/hooks/post-applypatch
fi
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