Background: I'm trying to host a git repository at my Box.com account, which offers DAV access using a server called SabreDAV. I ran into a few issues along the way. The first is that Box.com apparently doesn't like it if a directory has a dot in the name. No big deal, just use "foo" instead of "foo.git" for a bare repository. Next, it gives 404 errors when you try to GET a URL with an extraneous query string. Solution: use GIT_SMART_HTTP=0. Authentication is handled by libcurl automatically reading .netrc. I've gotten to the point where I can clone a repository, but pushing changes back to origin hangs followed by timeout. I don't know if this bug is in git or libcurl, but I think it's the former (as explained below).
Problem (see also attachment): When you try to push changes to the remote, it hangs, followed by erroring out with "code 52", which is CURLE_GOT_NOTHING. Further investigation shows that cURL successfully uses basic authentication to GET a few files before trying a PROPFIND request on the repository's root directory. The body of the request is in a separate XML file asking the server about the supportedlock property.
The first time, cURL sends the request without authentication and receives back 401 Unauthorized. The second time it tries the same request using Basic authentication (this is the same pattern which worked on the earlier GET requests). It gets back a 100-Continue, but fails to upload the XML file like it did before (if you're following along on the typescript, the verbose cURL output should say "* We are completely uploaded and fine"). Instead it hangs for 60 seconds and errors out with "Empty reply from server".
I don't think this bug is in libcurl, since it successfully executes all the other commands. I will try to investigate further, but I think it has something to do with the multi-pass authentication. Attached is a typescript of the behavior (editorial comments are placed inside [[ ]], and all user info has been scrubbed). In case the attachment doesn't go through, I have also pasted the typescript to gist [1]. If anyone else wants to reproduce the bug, Box.com does offer a free account.
[1] https://gist.githubusercontent.com/abbaad/d4a8ba1e36000eeb8e02/raw/dd5b10ae42b1936d8da33bd384c9affdb103f686/typescript.txt
-- Abbaad Haider abbaad@gmail.com
$ git --version && uname -a && curl-config --version git version 2.0.1 Linux localhost 3.15.3-1-ARCH #1 SMP PREEMPT Tue Jul 1 07:32:45 CEST 2014 x86_64 GNU/Linux libcurl 7.37.0 $ mkdir foo; cd foo $ git --bare init Initialized empty Git repository in /home/user/foo/ $ git update-server-info $ cd .. $ sudo mount -t davfs https://dav.box.com/dav ./box $ cp -r foo box $ sudo umount box $ rm -r foo $ cat > .netrc << EOF
> machine dav.box.com > login [[ redacted ]] > password [[ redacted ]] > EOF
$ chmod 600 .netrc $ GIT_SMART_HTTP=0 git clone https://dav.box.com/dav/foo Cloning into 'foo'... warning: You appear to have cloned an empty repository. Checking connectivity... done. $ cd foo/.git/hooks $ mv post-update.sample post-update $ cd ../.. $ touch bar $ git add . $ git commit -a -m "foo bar" [master (root-commit) 2031b47] foo bar 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 bar $ GIT_SMART_HTTP=0 GIT_CURL_VERBOSE=1 GIT_TRACE=1 git push origin master trace: built-in: git 'push' 'origin' 'master' trace: run_command: 'git-remote-https' 'origin' 'https://dav.box.com/dav/foo' * Hostname was NOT found in DNS cache * Trying 74.112.185.70... * Connected to dav.box.com (74.112.185.70) port 443 (#0) * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: none * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384 * Server certificate: * subject: serialNumber=jde9iuVneOEaNkFotOvLFaWx0vb5-Qpv; C=US; ST=California; L=Los Altos; O=Box, Inc.; CN=*.box.com * start date: 2014-04-07 05:14:35 GMT * expire date: 2017-10-31 20:06:48 GMT * subjectAltName: dav.box.com matched * issuer: C=US; O=GeoTrust, Inc.; CN=GeoTrust SSL CA * SSL certificate verify ok.
> GET /dav/foo/info/refs HTTP/1.1
User-Agent: git/2.0.1 Host: dav.box.com Accept: */* Accept-Encoding: gzip Pragma: no-cache
< HTTP/1.1 401 Unauthorized * Server nginx is not blacklisted < Server: nginx < Date: Fri, 04 Jul 2014 23:34:18 GMT < Content-Type: application/xml; charset=utf-8 < Content-Length: 242 < Connection: keep-alive < Vary: Host < WWW-Authenticate: Basic realm="dav.box.com" < * Ignoring the response-body * Connection #0 to host dav.box.com left intact * Issue another request to this URL: 'https://dav.box.com/dav/foo/info/refs' * Found bundle for host dav.box.com: 0x123ff40 * Re-using existing connection! (#0) with host dav.box.com * Connected to dav.box.com (74.112.185.70) port 443 (#0) * Server auth using Basic with user '[[ redacted ]]'
> GET /dav/foo/info/refs HTTP/1.1
Authorization: Basic [[ redacted ]] User-Agent: git/2.0.1 Host: dav.box.com Accept: */* Accept-Encoding: gzip Pragma: no-cache
< HTTP/1.1 200 OK * Server nginx is not blacklisted < Server: nginx < Date: Fri, 04 Jul 2014 23:34:19 GMT < Content-Type: application/octet-stream < Content-Length: 0 < Connection: keep-alive < Vary: Host < Cache-control: private < Accept-Ranges: bytes < Content-Disposition: attachment;filename="refs";filename*=UTF-8''refs < X-Content-Type-Options: nosniff < Last-Modified: Fri, 04 Jul 2014 23:23:51 GMT < ETag: "da39a3ee5e6b4b0d3255bfef95601890afd80709" < Accept-Ranges: bytes < * Connection #0 to host dav.box.com left intact * Found bundle for host dav.box.com: 0x123ff40 * Re-using existing connection! (#0) with host dav.box.com * Connected to dav.box.com (74.112.185.70) port 443 (#0) * Server auth using Basic with user '[[ redacted ]]'
> GET /dav/foo/HEAD HTTP/1.1
Authorization: Basic [[ redacted ]] User-Agent: git/2.0.1 Host: dav.box.com Accept: */* Accept-Encoding: gzip Pragma: no-cache
< HTTP/1.1 200 OK * Server nginx is not blacklisted < Server: nginx < Date: Fri, 04 Jul 2014 23:34:20 GMT < Content-Type: application/octet-stream < Content-Length: 23 < Connection: keep-alive < Vary: Host < Cache-control: private < Accept-Ranges: bytes < Content-Disposition: attachment;filename="HEAD";filename*=UTF-8''HEAD < X-Content-Type-Options: nosniff < Last-Modified: Fri, 04 Jul 2014 23:24:12 GMT < ETag: "acbaef275e46a7f14c1ef456fff2c8bbe8c84724" < Accept-Ranges: bytes < * Connection #0 to host dav.box.com left intact trace: run_command: 'http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master' trace: exec: 'git' 'http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master' trace: exec: 'git-http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master' trace: run_command: 'git-http-push' '--helper-status' 'https://dav.box.com/dav/foo/' 'refs/heads/master:refs/heads/master' * Hostname was NOT found in DNS cache * Trying 74.112.184.70... * Connected to dav.box.com (74.112.184.70) port 443 (#0) * successfully set certificate verify locations: * CAfile: /etc/ssl/certs/ca-certificates.crt CApath: none * SSL connection using TLSv1.2 / ECDHE-RSA-AES256-GCM-SHA384 * Server certificate: * subject: serialNumber=jde9iuVneOEaNkFotOvLFaWx0vb5-Qpv; C=US; ST=California; L=Los Altos; O=Box, Inc.; CN=*.box.com * start date: 2014-04-07 05:14:35 GMT * expire date: 2017-10-31 20:06:48 GMT * subjectAltName: dav.box.com matched * issuer: C=US; O=GeoTrust, Inc.; CN=GeoTrust SSL CA * SSL certificate verify ok.
> PROPFIND /dav/foo/ HTTP/1.1
User-Agent: git/2.0.1 Host: dav.box.com Accept: */* Depth: 0 Content-Type: text/xml Content-Length: 158 Expect: 100-continue
< HTTP/1.1 100 Continue * We are completely uploaded and fine < HTTP/1.1 401 Unauthorized * Server nginx is not blacklisted < Server: nginx < Date: Fri, 04 Jul 2014 23:34:21 GMT < Content-Type: application/xml; charset=utf-8 < Content-Length: 242 < Connection: keep-alive < Vary: Host < WWW-Authenticate: Basic realm="dav.box.com" * the ioctl callback returned 0 < * Ignoring the response-body * Connection #0 to host dav.box.com left intact * Issue another request to this URL: 'https://dav.box.com/dav/foo/' * Found bundle for host dav.box.com: 0x20469c0 * Re-using existing connection! (#0) with host dav.box.com * Connected to dav.box.com (74.112.184.70) port 443 (#0) * Server auth using Basic with user '[[ redacted ]]'
> PROPFIND /dav/foo/ HTTP/1.1
Authorization: Basic [[ redacted ]] User-Agent: git/2.0.1 Host: dav.box.com Accept: */* Depth: 0 Content-Type: text/xml Content-Length: 158 Expect: 100-continue
< HTTP/1.1 100 Continue [[ This is where it hangs for about 60 seconds ]] * Empty reply from server * Connection #0 to host dav.box.com left intact error: Cannot access URL https://dav.box.com/dav/foo/, return code 52 fatal: git-http-push failed error: failed to push some refs to 'https://dav.box.com/dav/foo'
