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-rw-r--r--generic/tclIOUtil.c87
1 files changed, 86 insertions, 1 deletions
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index 295e313..3d33992 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -24,6 +24,12 @@
#endif
#include "tclFileSystem.h"
+#ifdef TCL_TEMPLOAD_NO_UNLINK
+#ifndef NO_FSTATFS
+#include <sys/statfs.h>
+#endif
+#endif
+
/*
* struct FilesystemRecord --
*
@@ -3149,6 +3155,83 @@ Tcl_FSLoadFile(
typedef int (Tcl_FSLoadFileProc2) (Tcl_Interp *interp, Tcl_Obj *pathPtr,
Tcl_LoadHandle *handlePtr, Tcl_FSUnloadFileProc **unloadProcPtr, int flags);
+/*
+ * Workaround for issue with modern HPUX which do allow the unlink (no ETXTBSY
+ * error) yet somehow trash some internal data structures which prevents the
+ * second and further shared libraries from getting properly loaded. Only the
+ * first is ok. We try to get around the issue by not unlinking,
+ * i.e. emulating the behaviour of the older HPUX which denied removal.
+ *
+ * Doing the unlink is also an issue within docker containers, whose AUFS
+ * bungles this as well, see
+ * https://github.com/dotcloud/docker/issues/1911
+ *
+ * For these situations the change below makes the execution of the unlink
+ * semi-controllable at runtime.
+ *
+ * An AUFS filesystem (if it can be detected) will force avoidance of
+ * unlink. The env variable TCL_TEMPLOAD_NO_UNLINK allows detection of a
+ * users general request (unlink and not.
+ *
+ * By default the unlink is done (if not in AUFS). However if the variable is
+ * present and set to true (any integer > 0) then the unlink is skipped.
+ */
+
+int
+TclSkipUnlink (Tcl_Obj* shlibFile)
+{
+ /* Order of testing:
+ * 1. On hpux we generally want to skip unlink in general
+ *
+ * Outside of hpux then:
+ * 2. For a general user request (TCL_TEMPLOAD_NO_UNLINK present, non-empty, => int)
+ * 3. For general AUFS environment (statfs, if available).
+ *
+ * Ad 2: This variable can disable/override the AUFS detection, i.e. for
+ * testing if a newer AUFS does not have the bug any more.
+ *
+ * Ad 3: This is conditionally compiled in. Condition currently must be set manually.
+ * This part needs proper tests in the configure(.in).
+ */
+
+#ifdef hpux
+ return 1;
+#else
+ int skip = 0;
+ char* skipstr;
+
+ skipstr = getenv ("TCL_TEMPLOAD_NO_UNLINK");
+ if (skipstr && (skipstr[0] != '\0')) {
+ return atoi(skipstr);
+ }
+
+#ifdef TCL_TEMPLOAD_NO_UNLINK
+#ifndef NO_FSTATFS
+ {
+ struct statfs fs;
+ /* Have fstatfs. May not have the AUFS super magic ... Indeed our build
+ * box is too old to have it directly in the headers. Define taken from
+ * http://mooon.googlecode.com/svn/trunk/linux_include/linux/aufs_type.h
+ * http://aufs.sourceforge.net/
+ * Better reference will be gladly taken.
+ */
+#ifndef AUFS_SUPER_MAGIC
+#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's')
+#endif /* AUFS_SUPER_MAGIC */
+ if ((statfs(Tcl_GetString (shlibFile), &fs) == 0) &&
+ (fs.f_type == AUFS_SUPER_MAGIC)) {
+ return 1;
+ }
+ }
+#endif /* ... NO_FSTATFS */
+#endif /* ... TCL_TEMPLOAD_NO_UNLINK */
+
+ /* Fallback: !hpux, no EV override, no AUFS (detection, nor detected):
+ * Don't skip */
+ return 0;
+#endif /* hpux */
+}
+
int
TclLoadFile(
Tcl_Interp *interp, /* Used for error reporting. */
@@ -3353,7 +3436,9 @@ TclLoadFile(
* avoids any worries about leaving the copy laying around on exit.
*/
- if (Tcl_FSDeleteFile(copyToPtr) == TCL_OK) {
+ if (
+ !TclSkipUnlink (copyToPtr) &&
+ (Tcl_FSDeleteFile(copyToPtr) == TCL_OK)) {
Tcl_DecrRefCount(copyToPtr);
/*