Re: [PATCH v2 2/8] fast-import: directly use strbufs for paths

[Patrick Steinhardt <ps@pks.im>]

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On Mon, Apr 01, 2024 at 09:03:06AM +0000, Thalia Archibald wrote:
> Previously, one case would not write the path to the strbuf: when the
> path is unquoted and at the end of the string. It was essentially
> copy-on-write. However, with the logic simplification of the previous
> commit, this case was eliminated and the strbuf is always populated.
> 
> Directly use the strbufs now instead of an alias.
> 
> Since this already changes all the lines that use the strbufs, rename
> them from `uq` to be more descriptive. That they are unquoted is not
> their most important property, so name them after what they carry.
> 
> Additionally, `file_change_m` no longer needs to copy the path before
> reading inline data.
> 
> Signed-off-by: Thalia Archibald <thalia@archibald.dev>
> ---
>  builtin/fast-import.c | 64 ++++++++++++++++++-------------------------
>  1 file changed, 27 insertions(+), 37 deletions(-)
> 
> diff --git a/builtin/fast-import.c b/builtin/fast-import.c
> index 6f9048a037..fad9324e59 100644
> --- a/builtin/fast-import.c
> +++ b/builtin/fast-import.c
> @@ -2305,7 +2305,
> 7 @@ static void parse_path_space(struct strbuf *sb, const char *p, const char **endp
>  
>  static void file_change_m(const char *p, struct branch *b)
>  {
> -	static struct strbuf uq = STRBUF_INIT;
> +	static struct strbuf path = STRBUF_INIT;
>  	struct object_entry *oe;
>  	struct object_id oid;
>  	uint16_t mode, inline_data = 0;
> @@ -2342,13 +2342,12 @@ static void file_change_m(const char *p, struct branch *b)
>  			die("Missing space after SHA1: %s", command_buf.buf);
>  	}
>  
> -	strbuf_reset(&uq);
> -	parse_path_eol(&uq, p, "path");
> -	p = uq.buf;
> +	strbuf_reset(&path);
> +	parse_path_eol(&path, p, "path");
>  
>  	/* Git does not track empty, non-toplevel directories. */
> -	if (S_ISDIR(mode) && is_empty_tree_oid(&oid) && *p) {
> -		tree_content_remove(&b->branch_tree, p, NULL, 0);
> +	if (S_ISDIR(mode) && is_empty_tree_oid(&oid) && *path.buf) {
> +		tree_content_remove(&b->branch_tree, path.buf, NULL, 0);
>  		return;
>  	}
>  
> @@ -2369,10 +2368,6 @@ static void file_change_m(const char *p, str
> uct branch *b)
>  		if (S_ISDIR(mode))
>  			die("Directories cannot be specified 'inline': %s",
>  				command_buf.buf);
> -		if (p != uq.buf) {
> -			strbuf_addstr(&uq, p);
> -			p = uq.buf;
> -		}
>  		while (read_next_command() != EOF) {
>  			const char *v;
>  			if (skip_prefix(command_buf.buf, "cat-blob ", &v))
> @@ -2398,55 +2393,51 @@ static void file_change_m(const char *p, struct branch *b)
>  				command_buf.buf);
>  	}
>  
> -	if (!*p) {
> +	if (!*path.buf) {
>  		tree_content_replace(&b->branch_tree, &oid, mode, NULL);
>  		return;
>  	}
> -	tree_content_set(&b->branch_tree, p, &oid, mode, NULL);
> +	tree_content_set(&b->branch_tree, path.buf, &oid, mode, NULL);
>  }
>  
>  static void file_change_d(const char *p, struct branch *b)
>  {
> -	static struct strbuf uq = STRBUF_INIT;
> +	static struct strbuf path = STRBUF_INIT;
>  
> -	strbuf_reset(&uq);
> -	parse_path_eol(&uq, p, "path");
> -	p = uq.buf;
> -	tree_content_remove(&b->branch_tree, p, NULL, 1);
> +	strbuf_reset(&path);
> +	parse_path_eol(&path, p
> , "path");

This looks weird. Did you manually edit the patch or is there some weird
character in here that breaks diff generation?

> +	tree_content_remove(&b->branch_tree, path.buf, NULL, 1);
>  }
>  
>  static void file_change_cr(const char *p, struct branch *b, int rename)
>  {
> -	const char *s, *d;
> -	static struct strbuf s_uq = STRBUF_INIT;
> -	static struct strbuf d_uq = STRBUF_INIT;
> +	static struct strbuf source = STRBUF_INIT;
> +	static struct strbuf dest = STRBUF_INIT;
>  	struct tree_entry leaf;
>  
> -	strbuf_reset(&s_uq);
> -	parse_path_space(&s_uq, p, &p, "source");
> -	s = s_uq.buf;
> +	strbuf_reset(&source);
> +	parse_path_space(&source, p, &p, "source");
>  
>  	if (!p)
>  		die("Missing dest: %s", command_buf.buf);
> -	strbuf_reset(&d_uq);
> -	parse_path_eol(&d_uq, p, "dest");
> -	d = d_uq.buf;
> +	strbuf_reset(&dest);
> +	parse_path_eol(&dest, p, "dest");
>  
>  	memset(&leaf, 0, sizeof(leaf));
>  	if (rename)
> -		tree_content_remove(&b->branch_tree, s, &leaf, 1);
> +		tree_content_remove(&b->branch_tree, source.buf, &leaf, 1);
>  	else
> -		tree_content_get(&b->branch_tree, s, &leaf, 1);
> +		tree_content_get(&b-
> >branch_tree, source.buf, &leaf, 1);

Same here. Is your mail agent maybe wrapping lines?

>  	if (!leaf.versions[1].mode)
> -		die("Path %s not in branch", s);
> -	if (!*d) {	/* C "path/to/subdir" "" */
> +		die("Path %s not in branch", source.buf);
> +	if (!*dest.buf) {	/* C "path/to/subdir" "" */
>  		tree_content_replace(&b->branch_tree,
>  			&leaf.versions[1].oid,
>  			leaf.versions[1].mode,
>  			leaf.tree);
>  		return;
>  	}
> -	tree_content_set(&b->branch_tree, d,
> +	tree_content_set(&b->branch_tree, dest.buf,
>  		&leaf.versions[1].oid,
>  		leaf.versions[1].mode,
>  		leaf.tree);
> @@ -3174,7 +3165,7 @@ static void print_ls(int mode, const unsigned char *hash, const char *path)
>  
>  static void parse_ls(const char *p, struct branch *b)
>  {
> -	static struct strbuf uq = STRBUF_INIT;
> +	static struct strbuf path = STRBUF_INIT;
>  	struct tree_entry *root = NULL;
>  	struct tree_entry leaf = {NULL};
>  
> @@ -3191,10 +3182,9 @@ static void parse_ls(const char *p, struct branch *b)
>  			root->versions[1].mode = S_IFDIR;
>  		load_tree(root);
>  	}
> -	s
> trbuf_reset(&uq);

And here.

Other than those formatting issues this patch looks fine to me.

Patrick

> -	parse_path_eol(&uq, p, "path");
> -	p = uq.buf;
> -	tree_content_get(root, p, &leaf, 1);
> +	strbuf_reset(&path);
> +	parse_path_eol(&path, p, "path");
> +	tree_content_get(root, path.buf, &leaf, 1);
>  	/*
>  	 * A directory in preparation would have a sha1 of zero
>  	 * until it is saved.  Save, for simplicity.
> @@ -3202,7 +3192,7 @@ static void parse_ls(const char *p, struct branch *b)
>  	if (S_ISDIR(leaf.versions[1].mode))
>  		store_tree(&leaf);
>  
> -	print_ls(leaf.versions[1].mode, leaf.versions[1].oid.hash, p);
> +	print_ls(leaf.versions[1].mode, leaf.versions[1].oid.hash, path.buf);
>  	if (leaf.tree)
>  		release_tree_content_recursive(leaf.tree);
>  	if (!b || root != &b->branch_tree)
> -- 
> 2.44.0
> 

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