git apply --directory broken for new files

> apply --directory: handle creation and deletion patches
>
> We carefully verify that the input to git-apply is sane, including
> cross-checking that the filenames we see in "+++" headers match what was
> provided on the command line of "diff --git". When --directory is used,
> however, we ended up comparing the unadorned name to one with the
> prepended root, causing us to complain about a mismatch.
>
> We simply need to prepend the root directory, if any, when pulling the
> name out of the git header.

> diff --git a/builtin-apply.c b/builtin-apply.c
> index 2ab4aba..f9070d5 100644
> --- a/builtin-apply.c
> +++ b/builtin-apply.c
> @@ -787,6 +787,13 @@ static char *git_header_name(char *line, int llen)
>  					break;
>  			}
>  			if (second[len] == '\n' && !memcmp(name, second, len)) {
> +				if (root) {
> +					char *ret = xmalloc(root_len + len + 1);
> +					strcpy(ret, root);
> +					memcpy(ret + root_len, name, len);
> +					ret[root_len + len] = '\0';
> +					return ret;
> +				}
>  				return xmemdupz(name, len);
>  			}
>  		}

> I suspect this is only half of the story, because the code to parse:
> 
>  	diff --git "a/f\244o/bar.c" "b/f\244o/bar.c"
> 
> in the same function before the part you patched needs similar
> treatment.  There are two return of strbuf_detach(&first, NULL)
> in the if(){} block, and the return value needs to be prefixed with the
> value of --directory when given.

>> It would be easier to do this --directory prefixing in the sole caller of
>> git_header_name(), though.
>
> I went this route, and it is much more readable if slightly less
> efficient (one extra malloc/free).

>
> -- >8 --
> git apply --directory broken for new files
>
> We carefully verify that the input to git-apply is sane,
> including cross-checking that the filenames we see in "+++"
> headers match what was provided on the command line of "diff
> --git". When --directory is used, however, we ended up
> comparing the unadorned name to one with the prepended root,
> causing us to complain about a mismatch.
>
> We simply need to prepend the root directory, if any, when
> pulling the name out of the git header.
>
> Signed-off-by: Jeff King <peff@peff.net>
> ---
>  builtin-apply.c       |    7 ++++++
>  t/t4128-apply-root.sh |   52 +++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 59 insertions(+), 0 deletions(-)
>
> diff --git a/builtin-apply.c b/builtin-apply.c
> index bf80610..be7e1bd 100644
> --- a/builtin-apply.c
> +++ b/builtin-apply.c
> @@ -810,6 +810,13 @@ static int parse_git_header(char *line, int len, unsigned int size, struct patch
>  	 * the default name from the header.
>  	 */
>  	patch->def_name = git_header_name(line, len);
> +	if (patch->def_name && root) {
> +		char *s = xmalloc(root_len + strlen(patch->def_name) + 1);
> +		strcpy(s, root);
> +		strcpy(s + root_len, patch->def_name);
> +		free(patch->def_name);
> +		patch->def_name = s;
> +	}
>  
>  	line += len;
>  	size -= len;
> diff --git a/t/t4128-apply-root.sh b/t/t4128-apply-root.sh
> index 2dd0c75..bc7a8a8 100755
> --- a/t/t4128-apply-root.sh
> +++ b/t/t4128-apply-root.sh
> @@ -40,4 +40,56 @@ test_expect_success 'apply --directory -p (2) ' '
>  
>  '
>  
> +cat > patch << EOF
> +diff --git a/newfile b/newfile
> +new file mode 100644
> +index 0000000..d95f3ad
> +--- /dev/null
> ++++ b/newfile
> +@@ -0,0 +1 @@
> ++content
> +EOF
> +
> +test_expect_success 'apply --directory (new file)' '
> +	git reset --hard initial &&
> +	git apply --directory=some/sub/dir/ --index patch &&
> +	test content = $(git show :some/sub/dir/newfile) &&
> +	test content = $(cat some/sub/dir/newfile)
> +'
> +
> +cat > patch << EOF
> +diff --git a/delfile b/delfile
> +deleted file mode 100644
> +index d95f3ad..0000000
> +--- a/delfile
> ++++ /dev/null
> +@@ -1 +0,0 @@
> +-content
> +EOF
> +
> +test_expect_success 'apply --directory (delete file)' '
> +	git reset --hard initial &&
> +	echo content >some/sub/dir/delfile &&
> +	git add some/sub/dir/delfile &&
> +	git apply --directory=some/sub/dir/ --index patch &&
> +	! git ls-files | grep delfile
> +'
> +
> +cat > patch << 'EOF'
> +diff --git "a/qu\157tefile" "b/qu\157tefile"
> +new file mode 100644
> +index 0000000..d95f3ad
> +--- /dev/null
> ++++ "b/qu\157tefile"
> +@@ -0,0 +1 @@
> ++content
> +EOF
> +
> +test_expect_success 'apply --directory (quoted filename)' '
> +	git reset --hard initial &&
> +	git apply --directory=some/sub/dir/ --index patch &&
> +	test content = $(git show :some/sub/dir/quotefile) &&
> +	test content = $(cat some/sub/dir/quotefile)
> +'
> +
>  test_done
> -- 
> 1.6.0.2.519.g6cb82.dirty