Re: Create a new commit from patches without using any worktree?

[Bert Wesarg <bert.wesarg@googlemail.com>]

On Wed, Oct 27, 2010 at 11:07, Johannes Sixt <j.sixt@viscovery.net> wrote:
> Am 10/27/2010 3:49, schrieb Klas Lindberg:
>> Is there any way to record a new commit based on contents in a patch
>> without going through a worktree?
>
> This script may be a starter. It takes a commit on the command line
> instead of a patch, but it processes that commit as a patch ("diff-tree -p"),
> so the script should be easy to adapt.
>
> -- Hannes
>
> -- 8< --
> #!/bin/sh
>
> OPTIONS_SPEC="\
> git post to-ref [from-rev]
> --
> "
> . git-sh-setup
>
> while test $# != 0
> do
>        case "$1" in
>        --)     shift; break;;
>        -*)     usage;;
>        *)      break;;
>        esac
>        shift
> done
>
> FROM=$(git rev-parse --verify --symbolic-full-name "$1") || exit
> shift
> if test $# = 0; then
>        set -- HEAD
> fi
> test $# = 1 || usage
>
> # populate a temporary index
> tmpidx=$GIT_DIR/index-post-$$

I think you should honor GIT_INDEX_FILE here, so that you can
guarantee that tmpidx is on the same device as the index file used by
git read-tree.

Bert

> git read-tree --index-output="$tmpidx" "$FROM" || exit
> GIT_INDEX_FILE=$tmpidx
> export GIT_INDEX_FILE
> trap 'rm -f "$tmpidx"' 0 1 2 15
>
> git diff-tree -p -M -C "$@" | git apply --cached || exit
>
> newtree=$(git write-tree) &&
> newrev=$(
>        eval "$(get_author_ident_from_commit "$1")"
>        git-cat-file commit "$1" | sed -e '1,/^$/d' |
>        git commit-tree $newtree -p "$FROM"
> ) || exit
>
> if git check-ref-format "$FROM"
> then
>        set_reflog_action post
>        subject=$(git log --no-walk --pretty=%s "$newrev") &&
>        git update-ref -m "$GIT_REFLOG_ACTION: $subject" "$FROM" $newrev || exit
> fi
> if test -z "$GIT_QUIET"
> then
>        git rev-list -1 --oneline $newrev
> fi
> --
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