Subject: Re: [PATCH 4/5] bundle-uri: add support for http(s):// and file://

From: Josh Steadmon <[email-masked]>
Date: Wed, 27 Jul 2022 15:09:30 -0700

On 2022.07.25 20:34, Derrick Stolee via GitGitGadget wrote:
> From: Derrick Stolee <[email-masked]>
> 
> The previous change created the 'git clone --bundle-uri=<uri>' option.
> Currently, <uri> must be a filename.
> 
> Update copy_uri_to_file() to first inspect the URI for an HTTP(S) prefix
> and use git-remote-https as the way to download the data at that URI.
> Otherwise, check to see if file:// is present and modify the prefix
> accordingly.
> 
> Signed-off-by: Derrick Stolee <[email-masked]>
> ---
>  bundle-uri.c                | 70 +++++++++++++++++++++++++++++++++++--
>  t/t5558-clone-bundle-uri.sh | 45 ++++++++++++++++++++++++
>  2 files changed, 112 insertions(+), 3 deletions(-)
> 
> diff --git a/bundle-uri.c b/bundle-uri.c
> index b35babc36aa..7086382b186 100644
> --- a/bundle-uri.c
> +++ b/bundle-uri.c
> @@ -23,10 +23,74 @@ static int find_temp_filename(struct strbuf *name)
>  	return 0;
>  }
>  
> -static int copy_uri_to_file(const char *file, const char *uri)
> +static int download_https_uri_to_file(const char *file, const char *uri)
>  {
> -	/* File-based URIs only for now. */
> -	return copy_file(file, uri, 0);
> +	int result = 0;
> +	struct child_process cp = CHILD_PROCESS_INIT;
> +	FILE *child_in = NULL, *child_out = NULL;
> +	struct strbuf line = STRBUF_INIT;
> +	int found_get = 0;
> +
> +	strvec_pushl(&cp.args, "git-remote-https", "origin", uri, NULL);
> +	cp.in = -1;
> +	cp.out = -1;
> +
> +	if (start_command(&cp))
> +		return 1;
> +
> +	child_in = fdopen(cp.in, "w");
> +	if (!child_in) {
> +		result = 1;
> +		goto cleanup;
> +	}
> +
> +	child_out = fdopen(cp.out, "r");
> +	if (!child_out) {
> +		result = 1;
> +		goto cleanup;
> +	}
> +
> +	fprintf(child_in, "capabilities\n");
> +	fflush(child_in);
> +
> +	while (!strbuf_getline(&line, child_out)) {
> +		if (!line.len)
> +			break;
> +		if (!strcmp(line.buf, "get"))
> +			found_get = 1;
> +	}
> +	strbuf_release(&line);
> +
> +	if (!found_get) {
> +		result = error(_("insufficient capabilities"));
> +		goto cleanup;
> +	}
> +
> +	fprintf(child_in, "get %s %s\n\n", uri, file);
> +
> +cleanup:
> +	if (child_in)
> +		fclose(child_in);
> +	if (finish_command(&cp))
> +		return 1;
> +	if (child_out)
> +		fclose(child_out);
> +	return result;
> +}
> +
> +static int copy_uri_to_file(const char *filename, const char *uri)
> +{
> +	const char *out;
> +
> +	if (skip_prefix(uri, "https:", &out) ||
> +	    skip_prefix(uri, "http:", &out))
> +		return download_https_uri_to_file(filename, uri);

Since we're not using "out" here, should we replace the skip_prefix()s
with starts_with(), or perhaps even istarts_with()?

> +	if (!skip_prefix(uri, "file://", &out))
> +		out = uri;
> +
> +	/* Copy as a file */
> +	return copy_file(filename, out, 0);
>  }
>  
>  static int unbundle_from_file(struct repository *r, const char *file)
> diff --git a/t/t5558-clone-bundle-uri.sh b/t/t5558-clone-bundle-uri.sh
> index f709bcb729c..ad666a2d28a 100755
> --- a/t/t5558-clone-bundle-uri.sh
> +++ b/t/t5558-clone-bundle-uri.sh
> @@ -33,4 +33,49 @@ test_expect_success 'clone with path bundle' '
>  	test_cmp expect actual
>  '
>  
> +test_expect_success 'clone with file:// bundle' '
> +	git clone --bundle-uri="file://$(pwd)/clone-from/B.bundle" \
> +		clone-from clone-file &&
> +	git -C clone-file rev-parse refs/bundles/topic >actual &&
> +	git -C clone-from rev-parse topic >expect &&
> +	test_cmp expect actual
> +'
> +
> +#########################################################################
> +# HTTP tests begin here
> +
> +. "$TEST_DIRECTORY"/lib-httpd.sh
> +start_httpd
> +
> +test_expect_success 'fail to fetch from non-existent HTTP URL' '
> +	test_when_finished rm -rf test &&
> +	git clone --bundle-uri="$HTTPD_URL/does-not-exist" . test 2>err &&
> +	grep "failed to download bundle from URI" err
> +'
> +
> +test_expect_success 'fail to fetch from non-bundle HTTP URL' '
> +	test_when_finished rm -rf test &&
> +	echo bogus >"$HTTPD_DOCUMENT_ROOT_PATH/bogus" &&
> +	git clone --bundle-uri="$HTTPD_URL/bogus" . test 2>err &&
> +	grep "is not a bundle" err
> +'
> +
> +test_expect_success 'clone HTTP bundle' '
> +	cp clone-from/B.bundle "$HTTPD_DOCUMENT_ROOT_PATH/B.bundle" &&
> +
> +	git clone --no-local --mirror clone-from \
> +		"$HTTPD_DOCUMENT_ROOT_PATH/fetch.git" &&
> +
> +	git clone --bundle-uri="$HTTPD_URL/B.bundle" \
> +		"$HTTPD_URL/smart/fetch.git" clone-http &&
> +	git -C clone-http rev-parse refs/bundles/topic >actual &&
> +	git -C clone-from rev-parse topic >expect &&
> +	test_cmp expect actual &&
> +
> +	test_config -C clone-http log.excludedecoration refs/bundle/
> +'
> +
> +# Do not add tests here unless they use the HTTP server, as they will
> +# not run unless the HTTP dependencies exist.
> +
>  test_done
> -- 
> gitgitgadget
>