[PATCH v6 01/10] qemu-img: Flush stdout before before potential stderr messages
Eric Blake
eblake at redhat.com
Mon Jul 6 20:39:45 UTC 2020
During 'qemu-img create ... 2>&1', if --quiet is not in force, we can
end up with buffered I/O in stdout that was produced before failure,
but which appears in output after failure. This is confusing; the fix
is to flush stdout prior to attempting anything that might produce an
error message. Several iotests demonstrate the resulting ordering
change now that the merged outputs now reflect chronology. (An even
better fix would be to avoid printf from within block.c altogether,
but that's much more invasive...)
Signed-off-by: Eric Blake <eblake at redhat.com>
---
block.c | 1 +
tests/qemu-iotests/049.out | 8 ++++----
tests/qemu-iotests/054.out | 2 +-
tests/qemu-iotests/079.out | 2 +-
tests/qemu-iotests/112.out | 4 ++--
tests/qemu-iotests/259.out | 2 +-
6 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/block.c b/block.c
index 6dbcb7e083ea..a568196ba250 100644
--- a/block.c
+++ b/block.c
@@ -6186,6 +6186,7 @@ void bdrv_img_create(const char *filename, const char *fmt,
printf("Formatting '%s', fmt=%s ", filename, fmt);
qemu_opts_print(opts, " ");
puts("");
+ fflush(stdout);
}
ret = bdrv_create(drv, filename, opts, &local_err);
diff --git a/tests/qemu-iotests/049.out b/tests/qemu-iotests/049.out
index c54ae21b868a..22f395246b37 100644
--- a/tests/qemu-iotests/049.out
+++ b/tests/qemu-iotests/049.out
@@ -167,12 +167,12 @@ qemu-img create -f qcow2 -o compat=1.1 TEST_DIR/t.qcow2 64M
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 compat=1.1 cluster_size=65536 lazy_refcounts=off refcount_bits=16 compression_type=zlib
qemu-img create -f qcow2 -o compat=0.42 TEST_DIR/t.qcow2 64M
-qemu-img: TEST_DIR/t.qcow2: Invalid parameter '0.42'
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 compat=0.42 cluster_size=65536 lazy_refcounts=off refcount_bits=16 compression_type=zlib
+qemu-img: TEST_DIR/t.qcow2: Invalid parameter '0.42'
qemu-img create -f qcow2 -o compat=foobar TEST_DIR/t.qcow2 64M
-qemu-img: TEST_DIR/t.qcow2: Invalid parameter 'foobar'
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 compat=foobar cluster_size=65536 lazy_refcounts=off refcount_bits=16 compression_type=zlib
+qemu-img: TEST_DIR/t.qcow2: Invalid parameter 'foobar'
== Check preallocation option ==
@@ -183,8 +183,8 @@ qemu-img create -f qcow2 -o preallocation=metadata TEST_DIR/t.qcow2 64M
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 cluster_size=65536 preallocation=metadata lazy_refcounts=off refcount_bits=16 compression_type=zlib
qemu-img create -f qcow2 -o preallocation=1234 TEST_DIR/t.qcow2 64M
-qemu-img: TEST_DIR/t.qcow2: Invalid parameter '1234'
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 cluster_size=65536 preallocation=1234 lazy_refcounts=off refcount_bits=16 compression_type=zlib
+qemu-img: TEST_DIR/t.qcow2: Invalid parameter '1234'
== Check encryption option ==
@@ -206,7 +206,7 @@ qemu-img create -f qcow2 -o compat=0.10,lazy_refcounts=off TEST_DIR/t.qcow2 64M
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 compat=0.10 cluster_size=65536 lazy_refcounts=off refcount_bits=16 compression_type=zlib
qemu-img create -f qcow2 -o compat=0.10,lazy_refcounts=on TEST_DIR/t.qcow2 64M
-qemu-img: TEST_DIR/t.qcow2: Lazy refcounts only supported with compatibility level 1.1 and above (use version=v3 or greater)
Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 size=67108864 compat=0.10 cluster_size=65536 lazy_refcounts=on refcount_bits=16 compression_type=zlib
+qemu-img: TEST_DIR/t.qcow2: Lazy refcounts only supported with compatibility level 1.1 and above (use version=v3 or greater)
*** done
diff --git a/tests/qemu-iotests/054.out b/tests/qemu-iotests/054.out
index e6ec430edd47..71f18bb98760 100644
--- a/tests/qemu-iotests/054.out
+++ b/tests/qemu-iotests/054.out
@@ -1,8 +1,8 @@
QA output created by 054
creating too large image (1 EB)
-qemu-img: TEST_DIR/t.IMGFMT: The image size is too large for file format 'IMGFMT' (try using a larger cluster size)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1152921504606846976
+qemu-img: TEST_DIR/t.IMGFMT: The image size is too large for file format 'IMGFMT' (try using a larger cluster size)
creating too large image (1 EB) using qcow2.py
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296
diff --git a/tests/qemu-iotests/079.out b/tests/qemu-iotests/079.out
index aab922fb369b..f65a9ca84fea 100644
--- a/tests/qemu-iotests/079.out
+++ b/tests/qemu-iotests/079.out
@@ -9,6 +9,6 @@ Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 preallocation=metadat
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 preallocation=metadata
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 preallocation=metadata
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 preallocation=metadata
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 preallocation=metadata
qemu-img: TEST_DIR/t.IMGFMT: Cluster size must be a power of two between 512 and 2048k
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=4294967296 preallocation=metadata
*** done
diff --git a/tests/qemu-iotests/112.out b/tests/qemu-iotests/112.out
index ae0318cabea6..5e77e38a7a13 100644
--- a/tests/qemu-iotests/112.out
+++ b/tests/qemu-iotests/112.out
@@ -2,7 +2,6 @@ QA output created by 112
=== refcount_bits limits ===
-qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864 refcount_bits=-1
@@ -10,6 +9,7 @@ qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not e
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+qemu-img: TEST_DIR/t.IMGFMT: Refcount width must be a power of two and may not exceed 64 bits
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
refcount bits: 1
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
@@ -21,10 +21,10 @@ refcount bits: 16
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
refcount bits: 16
-qemu-img: TEST_DIR/t.IMGFMT: Different refcount widths than 16 bits require compatibility level 1.1 or above (use version=v3 or greater)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
qemu-img: TEST_DIR/t.IMGFMT: Different refcount widths than 16 bits require compatibility level 1.1 or above (use version=v3 or greater)
Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=67108864
+qemu-img: TEST_DIR/t.IMGFMT: Different refcount widths than 16 bits require compatibility level 1.1 or above (use version=v3 or greater)
=== Snapshot limit on refcount_bits=1 ===
diff --git a/tests/qemu-iotests/259.out b/tests/qemu-iotests/259.out
index ffed19c2a0af..e27b9ff38d75 100644
--- a/tests/qemu-iotests/259.out
+++ b/tests/qemu-iotests/259.out
@@ -9,6 +9,6 @@ virtual size: 64 MiB (67108864 bytes)
disk size: unavailable
--- Testing creation for which the node would need to grow ---
-qemu-img: TEST_DIR/t.IMGFMT: Could not resize image: Image format driver does not support resize
Formatting 'TEST_DIR/t.IMGFMT', fmt=qcow2 size=67108864 preallocation=metadata
+qemu-img: TEST_DIR/t.IMGFMT: Could not resize image: Image format driver does not support resize
*** done
--
2.27.0
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