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Extra zero-length file created after 7.42.0 appears to have broken -z option #237

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vszakats opened this Issue Apr 23, 2015 · 4 comments

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vszakats commented Apr 23, 2015

This code example (Windows platform):

echo TESTTEST> index.html
curl -fR -z .\index.html https://example.org/index.html -o .\index.html.newer
echo %ERRORLEVEL%

will create a zero-length file and return result code 0 when using curl 7.42.0.

In previous versions it was returning result 0 but the zero-length file was not created, which seems to be the correct behavior, given that -z means to download only if there is a newer than the reference-file found on the server. New behavior also makes it not possible to use -z either by checking the result code (always 0) or the existence of the output (always created).

This seems to be related to update #183. Here, the description "curl: create output file on successful download of an empty file" (and Daniel's video) suggests that a zero-length file is only expected if the server actually serves a zero-length file, which is not the case in above scenario; the file on the server has a length of 1270 bytes.

Therefore I believe this to be a bug.

@bagder bagder added the regression label Apr 23, 2015

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bagder commented Apr 23, 2015

@kdudka, feel like looking into this?

@kdudka kdudka self-assigned this Apr 23, 2015

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kdudka commented Apr 23, 2015

Sure, I will have a look. Sorry for the breakage!

kdudka added a commit that referenced this issue Apr 23, 2015

@kdudka
curl -z: do not write empty file on unmet condition 
This commit fixes a regression introduced in curl-7_41_0-186-g261a0fe.
It also introduces a regression test 1424 based on tests 78 and 1423.

Reported-by: Viktor Szakats
Bug: #237
710a2e9
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kdudka commented Apr 23, 2015

Fixed in 710a2e9. Thanks for the bug report!

@kdudka kdudka closed this Apr 23, 2015

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vszakats commented Apr 23, 2015

Thank you guys for the quick fix!

kdudka added a commit that referenced this issue Apr 23, 2015

@kdudka @bagder
curl -z: do not write empty file on unmet condition 
This commit fixes a regression introduced in curl-7_41_0-186-g261a0fe.
It also introduces a regression test 1424 based on tests 78 and 1423.

Reported-by: Viktor Szakats
Bug: #237
097460a

@jay jay referenced this issue Apr 27, 2015

Closed

curl -z -o appears to be broken #240

@mkoskar mkoskar referenced this issue Apr 28, 2015

Closed

FAILED to unzip ... #27

jsonn pushed a commit to jsonn/pkgsrc that referenced this issue May 3, 2015

wiz
Update to 7.42.1: 
Version 7.42.1 (28 Apr 2015)

Daniel Stenberg (28 Apr 2015)
- RELEASE-NOTES: 7.42.1 ready

- CURLOPT_HEADEROPT: default to separate

  Make the HTTP headers separated by default for improved security and
  reduced risk for information leakage.

  Bug: http://curl.haxx.se/docs/adv_20150429.html
  Reported-by: Yehezkel Horowitz, Oren Souroujon

- RELEASE-NOTES: synced with a6e0270e

- sws: init http2 state properly

  It would otherwise cause problems when running tests after 1801 etc.

- curl_easy_getinfo.3: document 'internals' in CURLINFO_TLS_SESSION

  ... as it was previouly undocumented what the pointer was.

- openssl: fix serial number output

  The code extracting the cert serial number was broken and didn't display
  it properly.

  Bug: curl/curl#235
  Reported-by: dkjjr89

- [Alessandro Ghedini brought this change]

  curl.1: fix typo

- RELEASE-NOTES: toward 7.42.1, synced with 097460a

- [Kamil Dudka brought this change]

  curl -z: do not write empty file on unmet condition

  This commit fixes a regression introduced in curl-7_41_0-186-g261a0fe.
  It also introduces a regression test 1424 based on tests 78 and 1423.

  Reported-by: Viktor Szakats
  Bug: curl/curl#237

- [Kamil Dudka brought this change]

  docs: distribute the CURLOPT_PINNEDPUBLICKEY(3) man page, too

- connectionexists: follow-up to fd9d3a1ef1f

  PROTOPT_CREDSPERREQUEST still needs to be checked even when NTLM is not
  enabled.

  Mistake-caught-by: Kamil Dudka

- connectionexists: fix build without NTLM

  Do not access NTLM-specific struct fields when built without NTLM
  enabled!

  bug: http://curl.haxx.se/?i=231
  Reported-by: Patrick Rapin

- dist: include {src,lib}/checksrc.whitelist
42a0292

@surr surr referenced this issue May 8, 2015

Closed

sudo nix-channel --update fails on recent unstable-channel #7669

@kdudka kdudka referenced this issue May 15, 2015

Closed

curl -z is useless #270

This was referenced May 24, 2015

Closed
Closed

mamash pushed a commit to joyent/pkgsrc-legacy that referenced this issue Sep 18, 2015

wiz Filip Hajny
Update to 7.42.1: 
Version 7.42.1 (28 Apr 2015)

Daniel Stenberg (28 Apr 2015)
- RELEASE-NOTES: 7.42.1 ready

- CURLOPT_HEADEROPT: default to separate

  Make the HTTP headers separated by default for improved security and
  reduced risk for information leakage.

  Bug: http://curl.haxx.se/docs/adv_20150429.html
  Reported-by: Yehezkel Horowitz, Oren Souroujon

- RELEASE-NOTES: synced with a6e0270e

- sws: init http2 state properly

  It would otherwise cause problems when running tests after 1801 etc.

- curl_easy_getinfo.3: document 'internals' in CURLINFO_TLS_SESSION

  ... as it was previouly undocumented what the pointer was.

- openssl: fix serial number output

  The code extracting the cert serial number was broken and didn't display
  it properly.

  Bug: curl/curl#235
  Reported-by: dkjjr89

- [Alessandro Ghedini brought this change]

  curl.1: fix typo

- RELEASE-NOTES: toward 7.42.1, synced with 097460a

- [Kamil Dudka brought this change]

  curl -z: do not write empty file on unmet condition

  This commit fixes a regression introduced in curl-7_41_0-186-g261a0fe.
  It also introduces a regression test 1424 based on tests 78 and 1423.

  Reported-by: Viktor Szakats
  Bug: curl/curl#237

- [Kamil Dudka brought this change]

  docs: distribute the CURLOPT_PINNEDPUBLICKEY(3) man page, too

- connectionexists: follow-up to fd9d3a1ef1f

  PROTOPT_CREDSPERREQUEST still needs to be checked even when NTLM is not
  enabled.

  Mistake-caught-by: Kamil Dudka

- connectionexists: fix build without NTLM

  Do not access NTLM-specific struct fields when built without NTLM
  enabled!

  bug: http://curl.haxx.se/?i=231
  Reported-by: Patrick Rapin

- dist: include {src,lib}/checksrc.whitelist
32adf10

jgsogo added a commit to jgsogo/curl that referenced this issue Oct 19, 2015

@kdudka @jgsogo
curl -z: do not write empty file on unmet condition 
This commit fixes a regression introduced in curl-7_41_0-186-g261a0fe.
It also introduces a regression test 1424 based on tests 78 and 1423.

Reported-by: Viktor Szakats
Bug: curl#237
1aaa279

@hjuutilainen hjuutilainen referenced this issue Nov 10, 2015

Closed

CURLDownloader downloads a zero byte file if download is unchanged (304) #235

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