Work around a design defect in Ninja whereby a zero mtime is used to
denote missing files (we happen to produce files that have a zero mtime
and yet really do exist.)

--- ninja-1.5.3/src/disk_interface.cc	2014-11-24 18:37:47.000000000 +0100
+++ ninja-1.5.3/src/disk_interface.cc	2015-07-18 23:20:38.572290139 +0200
@@ -194,6 +194,12 @@ TimeStamp RealDiskInterface::Stat(const
     }
     return -1;
   }
+
+  if (st.st_mtime == 0)
+    // All the code assumes that mtime == 0 means "file missing".  Here we
+    // know the file is not missing, so tweak the mtime.
+    st.st_mtime = 1;
+
   return st.st_mtime;
 #endif
 }
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<div class='path'>path: <a href='/guix/log/?id=49962b15a1c4e72a55b6cf273806d203906de2ed'>root</a>/<a href='/guix/log/tests?id=49962b15a1c4e72a55b6cf273806d203906de2ed'>tests</a>/<a href='/guix/log/tests/store.scm?id=49962b15a1c4e72a55b6cf273806d203906de2ed'>store.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/store.scm?id=49962b15a1c4e72a55b6cf273806d203906de2ed&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-05-07 00:18:36 +0200'>2017-05-07</span></td><td><a href='/guix/commit/tests/store.scm?id=1a0adad83f804d1d7190af7accb58284e4c69e3e'>tests: Corrupt archive import test is robust against different store prefixes.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-04-21 17:23:37 +0200'>2017-04-21</span></td><td><a href='/guix/commit/tests/store.scm?id=1397b422e254929de1805aaf1d0759cd5da6a60b'>store: 'GUIX_DAEMON_SOCKET' can now be a URI.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>