tag 683354 + patch thanks Hi, Alle martedì 31 luglio 2012, Gabriele Giacone ha scritto: > Upgrade to 0.9.7.3 then run apt-get update: > [...] > Reading package lists... Done > E: The package cache file is corrupted > > You won't be able to install/remove any package. > Downgrading apt and libapt-pkg4.12 to 0.9.7.2 fixes that. This happens in 0.9.7.3 because this version was fixed to properly use the fallback code (i.e. not using mremap()) in any occasion on non-Linux OSes. This means that in MMap::Map() mmap() is not used, but SyncToFd + buffer is; when synchronizing this (in the two MMap::Sync()), the write of the buffer to SyncToFd or the msync() call is done inside preprocessor blocks "#ifdef _POSIX_SYNCHRONIZED_IO"... and that symbol is not defined by glibc on Hurd, as msync() is not implemented (and returns ENOSYS). OTOH, you don't need the POSIX synchronized I/O to just write to the file, so the _POSIX_SYNCHRONIZED_IO blocks can be reduced to the actual msync() calls. Attached there is a patch implementing what said above; it makes apt working again on Hurd. Thanks, -- Pino Toscano
--- a/apt-pkg/contrib/mmap.cc
+++ b/apt-pkg/contrib/mmap.cc
@@ -160,7 +160,6 @@
if ((Flags & UnMapped) == UnMapped)
return true;
-#ifdef _POSIX_SYNCHRONIZED_IO
if ((Flags & ReadOnly) != ReadOnly)
{
if (SyncToFd != NULL)
@@ -170,11 +169,12 @@
}
else
{
+#ifdef _POSIX_SYNCHRONIZED_IO
if (msync((char *)Base, iSize, MS_SYNC) < 0)
return _error->Errno("msync", _("Unable to synchronize mmap"));
+#endif
}
}
-#endif
return true;
}
/*}}}*/
@@ -186,7 +186,6 @@
if ((Flags & UnMapped) == UnMapped)
return true;
-#ifdef _POSIX_SYNCHRONIZED_IO
unsigned long long PSize = sysconf(_SC_PAGESIZE);
if ((Flags & ReadOnly) != ReadOnly)
{
@@ -198,11 +197,12 @@
}
else
{
+#ifdef _POSIX_SYNCHRONIZED_IO
if (msync((char *)Base+(unsigned long long)(Start/PSize)*PSize,Stop - Start,MS_SYNC) < 0)
return _error->Errno("msync", _("Unable to synchronize mmap"));
+#endif
}
}
-#endif
return true;
}
/*}}}*/
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