[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-block] [PATCH v2 4/7] qemu-img: Add print_amend_option_help()
From: |
Max Reitz |
Subject: |
[Qemu-block] [PATCH v2 4/7] qemu-img: Add print_amend_option_help() |
Date: |
Wed, 9 May 2018 23:00:20 +0200 |
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 <address@hidden>
Reviewed-by: John Snow <address@hidden>
Reviewed-by: Eric Blake <address@hidden>
---
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 c84d047872..a1ae718a52 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 1527fbe1b7..4e52dce8d6 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
--
2.14.3
- [Qemu-block] [PATCH v2 0/7] qemu-img: Improve option help for amend, Max Reitz, 2018/05/09
- [Qemu-block] [PATCH v2 3/7] qemu-option: Pull out "Supported options" print, Max Reitz, 2018/05/09
- [Qemu-block] [PATCH v2 1/7] qemu-img: Amendment support implies create_opts, Max Reitz, 2018/05/09
- [Qemu-block] [PATCH v2 2/7] block: Add Error parameter to bdrv_amend_options, Max Reitz, 2018/05/09
- [Qemu-block] [PATCH v2 4/7] qemu-img: Add print_amend_option_help(),
Max Reitz <=
- [Qemu-block] [PATCH v2 5/7] qemu-img: Recognize no creation support in -o help, Max Reitz, 2018/05/09
- [Qemu-block] [PATCH v2 6/7] iotests: Test help option for unsupporting formats, Max Reitz, 2018/05/09
- [Qemu-block] [PATCH v2 7/7] iotests: Rework 113, Max Reitz, 2018/05/09