From d402b6a21a825a5c07aac9251990860723d49f5d Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Wed, 9 May 2018 23:00:21 +0200 Subject: [PATCH] qemu-img: Recognize no creation support in -o help The only users of print_block_option_help() are qemu-img create and qemu-img convert for the output image, so this function is always used for image creation (it used to be used for amendment also, but that is no longer the case). So if image creation is not supported by either the format or the protocol, there is no need to print any option description, because the user cannot create an image like this anyway. This also fixes an assertion failure: $ qemu-img create -f bochs -o help Supported options: qemu-img: util/qemu-option.c:219: qemu_opts_print_help: Assertion `list' failed. [1] 24831 abort (core dumped) qemu-img create -f bochs -o help Signed-off-by: Max Reitz Reviewed-by: John Snow Reviewed-by: Eric Blake Message-id: 20180509210023.20283-6-mreitz@redhat.com Signed-off-by: Max Reitz --- qemu-img.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/qemu-img.c b/qemu-img.c index 07935cb232..b1c1e484d2 100644 --- a/qemu-img.c +++ b/qemu-img.c @@ -249,6 +249,11 @@ static int print_block_option_help(const char *filename, const char *fmt) return 1; } + if (!drv->create_opts) { + error_report("Format driver '%s' does not support image creation", fmt); + return 1; + } + create_opts = qemu_opts_append(create_opts, drv->create_opts); if (filename) { proto_drv = bdrv_find_protocol(filename, true, &local_err); @@ -257,6 +262,11 @@ static int print_block_option_help(const char *filename, const char *fmt) qemu_opts_free(create_opts); return 1; } + if (!proto_drv->create_opts) { + error_report("Protocal driver '%s' does not support image creation", + proto_drv->format_name); + return 1; + } create_opts = qemu_opts_append(create_opts, proto_drv->create_opts); } -- 2.11.4.GIT