Subject: Re: [PATCH 2/2] ignorecase: Fix git mv on insensitive filesystems

From: Johannes Sixt <[email-masked]>
Date: Wed, 07 May 2014 08:17:02 +0200

Am 5/7/2014 0:59, schrieb [email-masked]:
> From: David Turner <[email-masked]>
> 
> Make it possible to change the case of a filename on a
> case-insensitive filesystem using git mv.  Change git mv to allow
> moves where the destination file exists if either the destination file
> has the same inode as the source file (for Mac) or the same name
> ignoring case (for Win).
> 
> Signed-off-by: David Turner <[email-masked]>
> ---
>  builtin/mv.c                | 18 ++++++++++--------
>  t/t6039-merge-ignorecase.sh |  2 +-
>  2 files changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/builtin/mv.c b/builtin/mv.c
> index 45e57f3..8cead13 100644
> --- a/builtin/mv.c
> +++ b/builtin/mv.c
> @@ -74,7 +74,7 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
>  	};
>  	const char **source, **destination, **dest_path, **submodule_gitfile;
>  	enum update_mode { BOTH = 0, WORKING_DIRECTORY, INDEX } *modes;
> -	struct stat st;
> +	struct stat src_st,dst_st;
>  	struct string_list src_for_dst = STRING_LIST_INIT_NODUP;
>  
>  	gitmodules_config();
> @@ -102,8 +102,8 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
>  	if (dest_path[0][0] == '\0')
>  		/* special case: "." was normalized to "" */
>  		destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
> -	else if (!lstat(dest_path[0], &st) &&
> -			S_ISDIR(st.st_mode)) {
> +	else if (!lstat(dest_path[0], &dst_st) &&
> +			S_ISDIR(dst_st.st_mode)) {
>  		dest_path[0] = add_slash(dest_path[0]);
>  		destination = internal_copy_pathspec(dest_path[0], argv, argc, DUP_BASENAME);
>  	} else {
> @@ -122,13 +122,13 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
>  			printf(_("Checking rename of '%s' to '%s'\n"), src, dst);
>  
>  		length = strlen(src);
> -		if (lstat(src, &st) < 0)
> +		if (lstat(src, &src_st) < 0)
>  			bad = _("bad source");
>  		else if (!strncmp(src, dst, length) &&
>  				(dst[length] == 0 || dst[length] == '/')) {
>  			bad = _("can not move directory into itself");
> -		} else if ((src_is_dir = S_ISDIR(st.st_mode))
> -				&& lstat(dst, &st) == 0)
> +		} else if ((src_is_dir = S_ISDIR(src_st.st_mode))
> +				&& lstat(dst, &dst_st) == 0)
>  			bad = _("cannot move directory over file");
>  		else if (src_is_dir) {
>  			int first = cache_name_pos(src, length);
> @@ -202,14 +202,16 @@ int cmd_mv(int argc, const char **argv, const char *prefix)
>  			}
>  		} else if (cache_name_pos(src, length) < 0)
>  			bad = _("not under version control");
> -		else if (lstat(dst, &st) == 0) {
> +		else if (lstat(dst, &dst_st) == 0 &&
> +			 (src_st.st_ino != dst_st.st_ino ||
> +			  (src_st.st_ino == 0 && strcasecmp(src, dst)))) {

Don't do that. st_ino is zero on Windows only because we do not spend time
to fill in the field. Don't use it as an indicator for a case-insensitive
file system; zero may be a valid inode number on other systems.

>  			bad = _("destination exists");
>  			if (force) {
>  				/*
>  				 * only files can overwrite each other:
>  				 * check both source and destination
>  				 */
> -				if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode)) {
> +				if (S_ISREG(dst_st.st_mode) || S_ISLNK(dst_st.st_mode)) {
>  					if (verbose)
>  						warning(_("overwriting '%s'"), dst);
>  					bad = NULL;
> diff --git a/t/t6039-merge-ignorecase.sh b/t/t6039-merge-ignorecase.sh
> index ad06752..28cfb49 100755
> --- a/t/t6039-merge-ignorecase.sh
> +++ b/t/t6039-merge-ignorecase.sh
> @@ -35,7 +35,7 @@ test_expect_success 'merge with case-changing rename on both sides' '
>  	git reset --hard baseline &&
>  	git branch -D with-camel &&
>  	git checkout -b with-camel &&
> -	git mv --force TestCase testcase &&
> +	git mv TestCase testcase &&
>  	git commit -m "recase on branch" &&
>  	> foo &&
>  	git add foo &&