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Posted to commits@subversion.apache.org by st...@apache.org on 2017/05/09 10:41:35 UTC

svn commit: r1794530 - in /subversion/branches/1.9.x-strict-rep-sharing: ./ build/ subversion/libsvn_client/ subversion/libsvn_fs_fs/ subversion/libsvn_repos/ subversion/libsvn_subr/ subversion/svnadmin/ subversion/tests/libsvn_subr/

Author: stsp
Date: Tue May  9 10:41:35 2017
New Revision: 1794530

URL: http://svn.apache.org/viewvc?rev=1794530&view=rev
Log:
On the 1.9.x-strict-rep-sharing branch, catch up with 1.9.x@r1794526.
This was a clean merge.

Modified:
    subversion/branches/1.9.x-strict-rep-sharing/   (props changed)
    subversion/branches/1.9.x-strict-rep-sharing/STATUS
    subversion/branches/1.9.x-strict-rep-sharing/build/run_tests.py
    subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_client/copy.c
    subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/rep-cache.c
    subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_repos/dump.c
    subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_subr/io.c
    subversion/branches/1.9.x-strict-rep-sharing/subversion/svnadmin/svnadmin.c
    subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_subr/io-test.c

Propchange: subversion/branches/1.9.x-strict-rep-sharing/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Tue May  9 10:41:35 2017
@@ -2,6 +2,7 @@
 /subversion/branches/1.5.x-r30215:870312
 /subversion/branches/1.7.x-fs-verify:1146708,1161180
 /subversion/branches/1.9-cache-improvements:1678948-1679863
+/subversion/branches/1.9.x:1786535-1794526
 /subversion/branches/1.9.x-fsfs-pack-fixes:1759183-1770158
 /subversion/branches/1.9.x-fsfs-rep-comparison:1717869-1739708
 /subversion/branches/1.9.x-r1664664:1674265-1674433
@@ -103,4 +104,4 @@
 /subversion/branches/verify-at-commit:1462039-1462408
 /subversion/branches/verify-keep-going:1439280-1546110
 /subversion/branches/wc-collate-path:1402685-1480384
-/subversion/trunk:1660545-1660547,1660549-1662901,1663003,1663183-1663184,1663253,1663286,1663338,1663347,1663355,1663374,1663450,1663500,1663530,1663671,1663697,1663706,1663738,1663749,1663791,1663991,1664035,1664078,1664080,1664084-1664085,1664187,1664191,1664193,1664200,1664344,1664476,1664480-1664481,1664483,1664489-1664490,1664507,1664520-1664521,1664523,1664526-1664527,1664531-1664532,1664588,1664593-1664594,1664596,1664653,1664664,1664672,1664674,1664684,1664927,1664938-1664940,1664978,1664984,1664997,1665164,1665195,1665213,1665259,1665318,1665437-1665438,1665609,1665611-1665612,1665845,1665850,1665852,1665873,1665886,1665894,1665896,1666096,1666258,1666270,1666272,1666379,1666449,1666690,1666832,1666851,1666965,1667101,1667106-1667107,1667120,1667228,1667233-1667235,1667249-1667250,1667258,1667290,1667301,1667471,1667691-1667693,1667699-1667700,1667715,1667941,1667976,1668320,1668598-1668600,1668602-1668603,1668607-1668608,1668618,1668625,1669743,1669746,1669749,1669945,167
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 24,1706375,1706428,1706437,1706783,1706983,1706999,1708699,1709388-1709389,1709553,1709562,1710104,1710167,1710215,1710290,1710558,1711250,1711346,1711507,1711510,1714314,1714358,1714790,1715224,1715232,1715262,1715777,1715793,1716808,1717154,1717869,1717871,1717873-1717875,1717878,1718167,1718267,1718269,1718484,1720015,1720643,1721174-1721175,1721285,1721488,1721648,1722164,1722860-1722861,1722879,1722887,1724448,1725180,1728308,1728387,1729060,1729519,1730856,1734106,1734926,1735179,1735826,1736432,1737122,1738259,1738659,1738828,1739278,1739280,1740252,1740254,1740316,1741071-1741073,1741078,1741096,1741200,1741206,1741401,1745515,1746053,1746277,1746364,1748514,1754190,1756266,1757529,1757532,1757539,1758128-1758130,1758153,1758202,1758204,1758207,1758209,1758224,1758269,1758385,1758781,1759117-1759124,1759686,1760570,1761334,1761653,1761755,1762338-1762339,1763934,1764034,1764676,1764851,1766240,1766323,1766327,1766352,1766590,1766699,1766704,1766711,1767768,1769152,1769456,17
 69973,1770677,1785734,1785737-1785738,1785754,1786445-1786447,1786515
+/subversion/trunk:1660545-1660547,1660549-1662901,1663003,1663183-1663184,1663253,1663286,1663338,1663347,1663355,1663374,1663450,1663500,1663530,1663671,1663697,1663706,1663738,1663749,1663791,1663991,1664035,1664078,1664080,1664084-1664085,1664187,1664191,1664193,1664200,1664344,1664476,1664480-1664481,1664483,1664489-1664490,1664507,1664520-1664521,1664523,1664526-1664527,1664531-1664532,1664588,1664593-1664594,1664596,1664653,1664664,1664672,1664674,1664684,1664927,1664938-1664940,1664978,1664984,1664997,1665164,1665195,1665213,1665259,1665318,1665437-1665438,1665609,1665611-1665612,1665845,1665850,1665852,1665873,1665886,1665894,1665896,1666096,1666258,1666270,1666272,1666379,1666449,1666690,1666832,1666851,1666965,1667101,1667106-1667107,1667120,1667228,1667233-1667235,1667249-1667250,1667258,1667290,1667301,1667471,1667691-1667693,1667699-1667700,1667715,1667941,1667976,1668320,1668598-1668600,1668602-1668603,1668607-1668608,1668618,1668625,1669743,1669746,1669749,1669945,167
 0139,1670149,1670152,1670329,1670337,1670347,1670353,1671164,1671388,1672295,1672311,1672372,1672404,1672511-1672512,1672578,1672728,1673044,1673062-1673063,1673065,1673153,1673170,1673172,1673197,1673202,1673204,1673228,1673282,1673445,1673691-1673692,1673746,1673785,1673803,1674015,1674032,1674170,1674301,1674305,1674308,1674339-1674340,1674406,1674415,1674455-1674456,1674475,1674487,1674522,1674580,1674626-1674627,1674785,1674891,1675771,1675774,1676526,1676535,1676538,1676555,1676564,1676570,1676665,1676667,1676769,1677003,1677191,1677267,1677440,1678147,1678149,1678494,1678571,1678734,1678742,1678745-1678746,1678755,1678839,1678846,1678894,1678950,1678963,1679166,1679169,1679228,1679230,1679240,1679287,1679864,1679866,1679909,1680242,1680264,1680495,1680705,1680819,1681317,1682714,1682854,1683071,1683126,1683135,1683266-1683267,1683290,1683303,1683311,1683378,1683387,1684034,1684077,1684322,1684325,1684344,1684412,1684940,1685034,1685085,1686175,1686239,1686478,1686541,1686543,
 1686554,1686557,1686802,1686888,1686984,1687029,1687304,1687389,1687769,1687776,1687812,1688258,1688273,1688395,1689214,1689216,1689721,1689729,1691712-1691713,1691924,1691928,1692091,1692093,1692098,1692448,1692469-1692470,1692798-1692799,1693135,1693138,1693159,1693886,1694023,1694194,1694481,1694929,1695022,1695600,1695606,1695681,1696222,1696225,1696387,1696695,1697381,1697384,1697387,1697664,1697824,1697835,1697845,1697914,1697967,1698106,1698312,1700130,1700215,1700219-1700220,1700740,1700951,1701064,1701206,1701270,1701298,1701598,1701603,1701611,1701633,1701638,1701646,1701736,1701792,1701797,1701838,1701997,1702198,1702200,1702203,1702218,1702231,1702237-1702239,1702247,1702288,1702299-1702300,1702310,1702397,1702407,1702467,1702472,1702474,1702478,1702533,1702549,1702553,1702565,1702891,1702974,1702991,1703470,1703475-1703477,1703544,1703581,1703675,1703688-1703689,1703740,1704292,1704573,1704821,1704847,1705060,1705062,1705064,1705088,1705328,1705843,1706241,1706323-17063
 24,1706375,1706428,1706432,1706437,1706783,1706983,1706999,1708699,1709388-1709389,1709553,1709562,1710104,1710167,1710215,1710290,1710558,1711250,1711346,1711507,1711510,1714314,1714358,1714790,1715224,1715232,1715262,1715777,1715793,1716808,1717154,1717869,1717871,1717873-1717875,1717878,1718167,1718267,1718269,1718484,1720015,1720643,1721174-1721175,1721285,1721488,1721648,1722164,1722860-1722861,1722879,1722887,1724448,1725180,1728308,1728387,1729060,1729519,1730856,1734106,1734926,1735179,1735826,1736432,1737122,1738259,1738659,1738828,1739278,1739280,1740252,1740254,1740316,1741071-1741073,1741078,1741096,1741200,1741206,1741401,1745515,1746053,1746277,1746364,1748514,1754190,1756266,1757529,1757532,1757539,1758128-1758130,1758153,1758202,1758204,1758207,1758209,1758224,1758269,1758385,1758781,1759116-1759124,1759686,1760570,1761334,1761653,1761755,1762338-1762339,1763934,1764034,1764676,1764851,1766240,1766323,1766327,1766352,1766590,1766699,1766704,1766711,1767768,1769152,17
 69456,1769973,1770677,1774109,1779948,1781507,1781655,1785734,1785737-1785738,1785754,1786445-1786447,1786515

Modified: subversion/branches/1.9.x-strict-rep-sharing/STATUS
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/STATUS?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/STATUS (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/STATUS Tue May  9 10:41:35 2017
@@ -28,13 +28,6 @@ Candidate changes:
                    this behavior change was reverted when a better fix was
                    implemented)
 
- * r1774109
-   Document the purpose of 'svnadmin freeze' more clearly.
-   Justification:
-     Not very important, nice to have documentation fix. Trivial merge.
-   Votes:
-     +1: stsp, julianfoad
-
  * r1776742, r1776783, r1776788
    Issue #4667: Reduce memory usage during merge, by tighter pool usage.
    Justification:
@@ -46,49 +39,40 @@ Candidate changes:
      nominated later. The issue #4667 need not be "closed" for this to be
      a useful backport.
    Votes:
-     +1: julianfoad
-
- * r1779948
-   Improve error message when copying/moving into unversioned dir.
-   Justification:
-     The current error message is misleading. It says "not a directory"
-     but there is a directory on disk.
-     User complained.
-   Votes:
-     +1: stsp
-
-* r1706432
-  Fix tests on Windows when passing --bin to win_tests.py.
-  Justification:
-    Tests should simply work.
-  Notes:
-    Fixes a bad commandline argument encoding in the Windows test runner.
-    Regression introduced in 1.9.2.
-  Votes:
-    +1: rhuijben
-    +1 (non-binding): luke1410
-
- * r1781507
-   Fix a NULL deref in libsvn_repos which makes svndumpfilter crash.
-   Justification:
-     Should not crash. User complained.
-   Votes:
-     +1: stsp
-
- * r1781655
-   Improve error message upon failure to open rep-cache.
-   Justification:
-     The current message lacks sufficient detail to be useful when it appears
-     in server logs.
-   Votes:
-     +1: stsp
+     +1: julianfoad, stefan2
 
  * r1783704
    Add support to build with 'zlibstat.lib' in install-layout on Windows.
    Justification:
      Simplifies build process on Windows.
    Votes:
-     +1: luke1410
+     +1: luke1410, rhuijben
+
+ * r1785737, r1785738, r1785734, r1786447, r1785754, r1786445, r1786446, r1786515
+   Make FSFS consistency no longer depend on hash algorithms.
+   Justification:
+     This eliminates any existing or future FSFS vulnerability due to
+     attacks on MD5 or SHA1.
+   Branch:
+     ^/subversion/branches/1.9.x-strict-rep-sharing
+   Notes:
+     Depends on r1759116 for correctness with older APR.
+     While the backport code is very close to the /trunk changes, it is
+     easier to review them as r1786580, r1786581 and r1786619 on the branch.
+     Will create a text conflict with the r1785053 backport.  Depending on
+     which change gets merged first, the respective other must be updated.
+   Votes:
+     +1: stefan2, rhuijben
+
+ * r1794166
+   Find gpg-agent socket using gpgconf, if possible.
+   Justification:
+     Improves GPG socket detection when $GPG_AGENT_INFO is unset or when gpg
+     >= 2.1.13 is used
+   Branch:
+     ^/subversion/branches/1.9.x-r1794166
+   Votes:
+     +1: jamessan
 
 Veto-blocked changes:
 =====================
@@ -111,3 +95,18 @@ Veto-blocked changes:
 
 Approved changes:
 =================
+
+ * r1785053
+   Never attempt to share directory representations in FSFS.
+   Justification:
+     This fixes inconsistent behavior.  We never add dir reps to the rep-
+     cache but would happily share any file or prop rep that happens to
+     match the respective directory rep.
+   Branch:
+     ^/subversion/branches/1.9.x-r1785053
+   Notes:
+     Will create a text conflict with the strict-rep-sharing patches.
+     Depending on which change gets merged first, the respective other
+     needs to be updated.
+   Votes:
+     +1: stefan2, rhuijben, stsp

Modified: subversion/branches/1.9.x-strict-rep-sharing/build/run_tests.py
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/build/run_tests.py?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/build/run_tests.py (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/build/run_tests.py Tue May  9 10:41:35 2017
@@ -213,7 +213,7 @@ class TestHarness:
       else:
         cmdline.append('--parallel-instances=%d' % self.opts.parallel)
     if self.opts.svn_bin is not None:
-      cmdline.append('--bin=%s', self.opts.svn_bin)
+      cmdline.append('--bin=%s' % self.opts.svn_bin)
     if self.opts.url is not None:
       cmdline.append('--url=%s' % self.opts.url)
     if self.opts.fs_type is not None:

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_client/copy.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_client/copy.c?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_client/copy.c (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_client/copy.c Tue May  9 10:41:35 2017
@@ -1057,10 +1057,24 @@ verify_wc_dsts(const apr_array_header_t
                                 ctx->wc_ctx, pair->dst_parent_abspath,
                                 FALSE, TRUE,
                                 iterpool));
-      if (make_parents && dst_parent_kind == svn_node_none)
+      if (dst_parent_kind == svn_node_none)
         {
-          SVN_ERR(svn_client__make_local_parents(pair->dst_parent_abspath,
-                                                 TRUE, ctx, iterpool));
+          if (make_parents)
+            SVN_ERR(svn_client__make_local_parents(pair->dst_parent_abspath,
+                                                   TRUE, ctx, iterpool));
+          else
+            {
+              SVN_ERR(svn_io_check_path(pair->dst_parent_abspath,
+                                        &dst_parent_kind, scratch_pool));
+              return svn_error_createf(SVN_ERR_WC_PATH_NOT_FOUND, NULL,
+                                       (dst_parent_kind == svn_node_dir)
+                                         ? _("Directory '%s' is not under "
+                                             "version control")
+                                         : _("Path '%s' is not a directory"),
+                                       svn_dirent_local_style(
+                                         pair->dst_parent_abspath,
+                                         scratch_pool));
+            }
         }
       else if (dst_parent_kind != svn_node_dir)
         {

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/rep-cache.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/rep-cache.c?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/rep-cache.c (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_fs_fs/rep-cache.c Tue May  9 10:41:35 2017
@@ -128,7 +128,10 @@ svn_fs_fs__open_rep_cache(svn_fs_t *fs,
   fs_fs_data_t *ffd = fs->fsap_data;
   svn_error_t *err = svn_atomic__init_once(&ffd->rep_cache_db_opened,
                                            open_rep_cache, fs, pool);
-  return svn_error_quick_wrap(err, _("Couldn't open rep-cache database"));
+  return svn_error_quick_wrapf(err,
+                               _("Couldn't open rep-cache database '%s'"),
+                               svn_dirent_local_style(
+                                 path_rep_cache_db(fs->path, pool), pool));
 }
 
 svn_error_t *

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_repos/dump.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_repos/dump.c?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_repos/dump.c (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_repos/dump.c Tue May  9 10:41:35 2017
@@ -546,11 +546,15 @@ svn_repos__dump_revision_record(svn_stre
                                  "%" APR_SIZE_T_FMT, propstring->len));
     }
 
-  /* Write out a regular Content-length header for the benefit of
-     non-Subversion RFC-822 parsers. */
-  svn_hash_sets(headers, SVN_REPOS_DUMPFILE_CONTENT_LENGTH,
-                apr_psprintf(scratch_pool,
-                             "%" APR_SIZE_T_FMT, propstring->len));
+  if (propstring)
+    {
+      /* Write out a regular Content-length header for the benefit of
+         non-Subversion RFC-822 parsers. */
+      svn_hash_sets(headers, SVN_REPOS_DUMPFILE_CONTENT_LENGTH,
+                    apr_psprintf(scratch_pool,
+                                 "%" APR_SIZE_T_FMT, propstring->len));
+    }
+
   SVN_ERR(write_revision_headers(dump_stream, headers, scratch_pool));
 
   /* End of headers */

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_subr/io.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_subr/io.c?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_subr/io.c (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/libsvn_subr/io.c Tue May  9 10:41:35 2017
@@ -4044,6 +4044,26 @@ svn_io_write_atomic(const char *final_pa
 svn_error_t *
 svn_io_file_trunc(apr_file_t *file, apr_off_t offset, apr_pool_t *pool)
 {
+  /* Workaround for yet another APR issue with trunc.
+
+     If the APR file internally is in read mode, the current buffer pointer
+     will not be clipped to the valid data range. get_file_offset may then
+     return an invalid position *after* new data was written to it.
+
+     To prevent this, write 1 dummy byte just after the OFFSET at which we
+     will trunc it.  That will force the APR file into write mode
+     internally and the flush() work-around below becomes affective. */
+  apr_off_t position = 0;
+
+  /* A frequent usage is OFFSET==0, in which case we don't need to preserve
+     any file content or file pointer. */
+  if (offset)
+    {
+      SVN_ERR(svn_io_file_seek(file, APR_CUR, &position, pool));
+      SVN_ERR(svn_io_file_seek(file, APR_SET, &offset, pool));
+    }
+  SVN_ERR(svn_io_file_putc(0, file, pool));
+
   /* This is a work-around. APR would flush the write buffer
      _after_ truncating the file causing now invalid buffered
      data to be written behind OFFSET. */
@@ -4052,10 +4072,17 @@ svn_io_file_trunc(apr_file_t *file, apr_
                                      N_("Can't flush stream"),
                                      pool));
 
-  return do_io_file_wrapper_cleanup(file, apr_file_trunc(file, offset),
-                                    N_("Can't truncate file '%s'"),
-                                    N_("Can't truncate stream"),
-                                    pool);
+  SVN_ERR(do_io_file_wrapper_cleanup(file, apr_file_trunc(file, offset),
+                                     N_("Can't truncate file '%s'"),
+                                     N_("Can't truncate stream"),
+                                     pool));
+
+  /* Restore original file pointer, if necessary.
+     It's currently at OFFSET. */
+  if (position < offset)
+    SVN_ERR(svn_io_file_seek(file, APR_SET, &position, pool));
+
+  return SVN_NO_ERROR;
 }
 
 

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/svnadmin/svnadmin.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/svnadmin/svnadmin.c?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/svnadmin/svnadmin.c (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/svnadmin/svnadmin.c Tue May  9 10:41:35 2017
@@ -396,6 +396,7 @@ static const svn_opt_subcommand_desc2_t
    ("usage: 1. svnadmin freeze REPOS_PATH PROGRAM [ARG...]\n"
     "               2. svnadmin freeze -F FILE PROGRAM [ARG...]\n\n"
     "1. Run PROGRAM passing ARGS while holding a write-lock on REPOS_PATH.\n"
+    "   Allows safe use of third-party backup tools on a live repository.\n"
     "\n"
     "2. Like 1 except all repositories listed in FILE are locked. The file\n"
     "   format is repository paths separated by newlines.  Repositories are\n"

Modified: subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_subr/io-test.c
URL: http://svn.apache.org/viewvc/subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_subr/io-test.c?rev=1794530&r1=1794529&r2=1794530&view=diff
==============================================================================
--- subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_subr/io-test.c (original)
+++ subversion/branches/1.9.x-strict-rep-sharing/subversion/tests/libsvn_subr/io-test.c Tue May  9 10:41:35 2017
@@ -783,6 +783,51 @@ test_install_stream_to_longpath(apr_pool
   return SVN_NO_ERROR;
 }
 
+static svn_error_t *
+test_apr_trunc_workaround(apr_pool_t *pool)
+{
+  const char *tmp_dir;
+  const char *tmp_file;
+  apr_file_t *f;
+  apr_size_t len;
+  apr_off_t offset;
+  char dummy;
+
+  /* create a temp folder & schedule it for automatic cleanup */
+  SVN_ERR(svn_dirent_get_absolute(&tmp_dir, "test_apr_trunc_workaround",
+                                  pool));
+  SVN_ERR(svn_io_remove_dir2(tmp_dir, TRUE, NULL, NULL, pool));
+  SVN_ERR(svn_io_make_dir_recursively(tmp_dir, pool));
+  svn_test_add_dir_cleanup(tmp_dir);
+
+  /* create an r/w file */
+  tmp_file = svn_dirent_join(tmp_dir, "file", pool);
+  SVN_ERR(svn_io_file_open(&f, tmp_file,
+                           APR_READ | APR_WRITE | APR_BUFFERED | APR_CREATE |
+                              APR_TRUNCATE,
+                           APR_OS_DEFAULT, pool));
+
+  /* write some content and put it internally into read mode */
+  len = 10;
+  SVN_ERR(svn_io_file_write(f, "0123456789", &len, pool));
+
+  offset = 0;
+  SVN_ERR(svn_io_file_seek(f, APR_SET, &offset, pool));
+  SVN_ERR(svn_io_file_getc(&dummy, f, pool));
+
+  /* clear the file and write some new content */
+  SVN_ERR(svn_io_file_trunc(f, 0, pool));
+  len = 3;
+  SVN_ERR(svn_io_file_write(f, "abc", &len, pool));
+
+  /* we should now be positioned at the end of the new content */
+  offset = 0;
+  SVN_ERR(svn_io_file_seek(f, APR_CUR, &offset, pool));
+  SVN_TEST_ASSERT(offset == (int)len);
+
+  return SVN_NO_ERROR;  
+}
+
 /* The test table.  */
 
 static int max_threads = 3;
@@ -806,6 +851,8 @@ static struct svn_test_descriptor_t test
                    "test ignore-enoent"),
     SVN_TEST_PASS2(test_install_stream_to_longpath,
                    "test svn_stream__install_stream to long path"),
+    SVN_TEST_PASS2(test_apr_trunc_workaround,
+                   "test workaround for APR in svn_io_file_trunc"),
     SVN_TEST_NULL
   };