From dfc5e2a61a96cf4f727d2e7b4f41124933746f6d Mon Sep 17 00:00:00 2001

From: Max Reitz <mreitz@redhat.com>

Date: Mon, 18 Jun 2018 14:59:40 +0200

Subject: [PATCH 06/89] qemu-img: Add print_amend_option_help()

RH-Author: Max Reitz <mreitz@redhat.com>

Message-id: <20180618145943.4489-5-mreitz@redhat.com>

Patchwork-id: 80753

O-Subject: [RHV-7.6 qemu-kvm-rhev PATCH 4/7] qemu-img: Add print_amend_option_help()

Bugzilla: 1537956

RH-Acked-by: John Snow <jsnow@redhat.com>

RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

The more generic print_block_option_help() function is not really

suitable for qemu-img amend, for a couple of reasons:

(1) We do not need to append the protocol-level options, as amendment

    happens only on one node and does not descend downwards to its

    children.

(2) print_block_option_help() says those options are "supported".  For

    option amendment, we do not really know that.  So this new function

    explicitly says that those options are the creation options, and not

    all of them may be supported.

(3) If the driver does not support option amendment, we should not print

    anything (except for an error message that amendment is not

    supported).

Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=1537956

Signed-off-by: Max Reitz <mreitz@redhat.com>

Reviewed-by: John Snow <jsnow@redhat.com>

Reviewed-by: Eric Blake <eblake@redhat.com>

Message-id: 20180509210023.20283-5-mreitz@redhat.com

Signed-off-by: Max Reitz <mreitz@redhat.com>

(cherry picked from commit 51641351420e4f9dc6613d0dd03a5f0f214ed5b6)

Signed-off-by: Max Reitz <mreitz@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 qemu-img.c                 | 30 ++++++++++++++++++++++++++++--

 tests/qemu-iotests/082.out | 44 +++++++++++++++++++++++++++-----------------

 2 files changed, 55 insertions(+), 19 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c

index cdeb01b..d4cbb63 100644

--- a/qemu-img.c

+++ b/qemu-img.c

@@ -3609,6 +3609,32 @@ static void amend_status_cb(BlockDriverState *bs,

     qemu_progress_print(100.f * offset / total_work_size, 0);

 }

+static int print_amend_option_help(const char *format)

+{

+    BlockDriver *drv;

+

+    /* Find driver and parse its options */

+    drv = bdrv_find_format(format);

+    if (!drv) {

+        error_report("Unknown file format '%s'", format);

+        return 1;

+    }

+

+    if (!drv->bdrv_amend_options) {

+        error_report("Format driver '%s' does not support option amendment",

+                     format);

+        return 1;

+    }

+

+    /* Every driver supporting amendment must have create_opts */

+    assert(drv->create_opts);

+

+    printf("Creation options for '%s':\n", format);

+    qemu_opts_print_help(drv->create_opts);

+    printf("\nNote that not all of these options may be amendable.\n");

+    return 0;

+}

+

 static int img_amend(int argc, char **argv)

 {

     Error *err = NULL;

@@ -3708,7 +3734,7 @@ static int img_amend(int argc, char **argv)

     if (fmt && has_help_option(options)) {

         /* If a format is explicitly specified (and possibly no filename is

          * given), print option help here */

-        ret = print_block_option_help(filename, fmt);

+        ret = print_amend_option_help(fmt);

         goto out;

     }

@@ -3737,7 +3763,7 @@ static int img_amend(int argc, char **argv)

     if (has_help_option(options)) {

         /* If the format was auto-detected, print option help here */

-        ret = print_block_option_help(filename, fmt);

+        ret = print_amend_option_help(fmt);

         goto out;

     }

diff --git a/tests/qemu-iotests/082.out b/tests/qemu-iotests/082.out

index 1527fbe..4e52dce 100644

--- a/tests/qemu-iotests/082.out

+++ b/tests/qemu-iotests/082.out

@@ -546,7 +546,7 @@ cluster_size: 65536

 === amend: help for -o ===

 Testing: amend -f qcow2 -o help TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -564,10 +564,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o ? TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -585,10 +586,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o cluster_size=4k,help TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -606,10 +608,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o cluster_size=4k,? TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -627,10 +630,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o help,cluster_size=4k TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -648,10 +652,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o ?,cluster_size=4k TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -669,10 +674,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o cluster_size=4k -o help TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -690,10 +696,11 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o cluster_size=4k -o ? TEST_DIR/t.qcow2

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -711,7 +718,8 @@ cluster_size     qcow2 cluster size

 preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

-nocow            Turn off copy-on-write (valid only on btrfs)

+

+Note that not all of these options may be amendable.

 Testing: amend -f qcow2 -o backing_file=TEST_DIR/t.qcow2,,help TEST_DIR/t.qcow2

@@ -731,7 +739,7 @@ Testing: amend -f qcow2 -o backing_file=TEST_DIR/t.qcow2 -o ,, -o help TEST_DIR/

 qemu-img: Invalid option list: ,,

 Testing: amend -f qcow2 -o help

-Supported options:

+Creation options for 'qcow2':

 size             Virtual disk size

 compat           Compatibility level (0.10 or 1.1)

 backing_file     File name of a base image

@@ -750,6 +758,8 @@ preallocation    Preallocation mode (allowed values: off, metadata, falloc, full

 lazy_refcounts   Postpone refcount updates

 refcount_bits    Width of a reference count entry in bits

+Note that not all of these options may be amendable.

+

 Testing: convert -o help

 Supported options:

 size             Virtual disk size

-- 

1.8.3.1