vfsfss2dir.cpp@ 83743

Last change on this file since 83743 was 82968, checked in by vboxsync, 5 years ago
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1	/* $Id: vfsfss2dir.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* IPRT - Virtual File System, FS write stream dumping in a normal directory.
4	*
5	* This is just a simple mechanism to provide a drop in for the TAR creator
6	* that writes files individually to the disk instead of a TAR archive. It
7	* has an additional feature for removing the files to help bail out on error.
8	*/
9
10	/*
11	* Copyright (C) 2010-2020 Oracle Corporation
12	*
13	* This file is part of VirtualBox Open Source Edition (OSE), as
14	* available from http://www.virtualbox.org. This file is free software;
15	* you can redistribute it and/or modify it under the terms of the GNU
16	* General Public License (GPL) as published by the Free Software
17	* Foundation, in version 2 as it comes in the "COPYING" file of the
18	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
19	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
20	*
21	* The contents of this file may alternatively be used under the terms
22	* of the Common Development and Distribution License Version 1.0
23	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
24	* VirtualBox OSE distribution, in which case the provisions of the
25	* CDDL are applicable instead of those of the GPL.
26	*
27	* You may elect to license modified versions of this file under the
28	* terms and conditions of either the GPL or the CDDL or both.
29	*/
30
31
32	/*********************************************************************************************************************************
33	* Header Files *
34	*********************************************************************************************************************************/
35	/// @todo #define RTVFSFSS2DIR_USE_DIR
36	#include "internal/iprt.h"
37	#include <iprt/vfs.h>
38
39	#include <iprt/assert.h>
40	#include <iprt/err.h>
41	#include <iprt/file.h>
42	#include <iprt/mem.h>
43	#ifndef RTVFSFSS2DIR_USE_DIR
44	# include <iprt/path.h>
45	#endif
46	#include <iprt/string.h>
47	#include <iprt/vfslowlevel.h>
48
49
50	/*********************************************************************************************************************************
51	* Structures and Typedefs *
52	*********************************************************************************************************************************/
53	/**
54	* Undo entry for RTVFSFSSWRITE2DIR.
55	*/
56	typedef struct RTVFSFSSWRITE2DIRENTRY
57	{
58	/** The list entry (head is RTVFSFSSWRITE2DIR::Entries). */
59	RTLISTNODE Entry;
60	/** The file mode mask. */
61	RTFMODE fMode;
62	#ifdef RTVFSFSS2DIR_USE_DIR
63	/** The name (relative to RTVFSFSSWRITE2DIR::hVfsBaseDir). */
64	#else
65	/** The name (relative to RTVFSFSSWRITE2DIR::szBaseDir). */
66	#endif
67	char szName[RT_FLEXIBLE_ARRAY];
68	} RTVFSFSSWRITE2DIRENTRY;
69	/** Pointer to a RTVFSFSSWRITE2DIR undo entry. */
70	typedef RTVFSFSSWRITE2DIRENTRY *PRTVFSFSSWRITE2DIRENTRY;
71
72	/**
73	* FSS write to directory instance.
74	*/
75	typedef struct RTVFSFSSWRITE2DIR
76	{
77	/** Flags (RTVFSFSS2DIR_F_XXX). */
78	uint32_t fFlags;
79	/** Number of files and stuff we've created. */
80	uint32_t cEntries;
81	/** Files and stuff we've created (RTVFSFSSWRITE2DIRENTRY).
82	* This is used for reverting changes on failure. */
83	RTLISTANCHOR Entries;
84	#ifdef RTVFSFSS2DIR_USE_DIR
85	/** The handle of the base directory. */
86	RTVFSDIR hVfsBaseDir;
87	#else
88	/** Path to the directory that all operations are relative to. */
89	char szBaseDir[RT_FLEXIBLE_ARRAY];
90	#endif
91	} RTVFSFSSWRITE2DIR;
92	/** Pointer to a write-to-directory FSS instance. */
93	typedef RTVFSFSSWRITE2DIR *PRTVFSFSSWRITE2DIR;
94
95
96	/*********************************************************************************************************************************
97	* Internal Functions *
98	*********************************************************************************************************************************/
99	static DECLCALLBACK(int) rtVfsFssToDir_PushFile(void pvThis, const char pszPath, uint64_t cbFile, PCRTFSOBJINFO paObjInfo,
100	uint32_t cObjInfo, uint32_t fFlags, PRTVFSIOSTREAM phVfsIos);
101
102
103	/**
104	* @interface_method_impl{RTVFSOBJOPS,pfnClose}
105	*/
106	static DECLCALLBACK(int) rtVfsFssToDir_Close(void *pvThis)
107	{
108	PRTVFSFSSWRITE2DIR pThis = (PRTVFSFSSWRITE2DIR)pvThis;
109
110	#ifdef RTVFSFSS2DIR_USE_DIR
111	RTVfsDirRelease(pThis->hVfsBaseDir);
112	pThis->hVfsBaseDir = NIL_RTVFSDIR;
113	#endif
114
115	PRTVFSFSSWRITE2DIRENTRY pCur;
116	PRTVFSFSSWRITE2DIRENTRY pNext;
117	RTListForEachSafe(&pThis->Entries, pCur, pNext, RTVFSFSSWRITE2DIRENTRY, Entry)
118	{
119	RTMemFree(pCur);
120	}
121	return VINF_SUCCESS;
122	}
123
124
125	/**
126	* @interface_method_impl{RTVFSOBJOPS,pfnQueryInfo}
127	*/
128	static DECLCALLBACK(int) rtVfsFssToDir_QueryInfo(void *pvThis, PRTFSOBJINFO pObjInfo, RTFSOBJATTRADD enmAddAttr)
129	{
130	RT_NOREF(pvThis);
131
132	/* no info here, sorry. */
133	RT_ZERO(*pObjInfo);
134	pObjInfo->Attr.enmAdditional = enmAddAttr;
135
136	return VINF_SUCCESS;
137	}
138
139
140	/**
141	* @interface_method_impl{RTVFSFSSTREAMOPS,pfnAdd}
142	*/
143	static DECLCALLBACK(int) rtVfsFssToDir_Add(void pvThis, const char pszPath, RTVFSOBJ hVfsObj, uint32_t fFlags)
144	{
145	PRTVFSFSSWRITE2DIR pThis = (PRTVFSFSSWRITE2DIR)pvThis;
146	RT_NOREF(fFlags);
147
148	/*
149	* Query information about the object.
150	*/
151	RTFSOBJINFO ObjInfo;
152	int rc = RTVfsObjQueryInfo(hVfsObj, &ObjInfo, RTFSOBJATTRADD_UNIX);
153	AssertRCReturn(rc, rc);
154
155	/*
156	* Deal with files.
157	*/
158	if (RTFS_IS_FILE(ObjInfo.Attr.fMode))
159	{
160	RTVFSIOSTREAM hVfsIosSrc = RTVfsObjToIoStream(hVfsObj);
161	AssertReturn(hVfsIosSrc != NIL_RTVFSIOSTREAM, VERR_WRONG_TYPE);
162
163	RTVFSIOSTREAM hVfsIosDst;
164	rc = rtVfsFssToDir_PushFile(pvThis, pszPath, ObjInfo.cbObject, &ObjInfo, 1, 0 /fFlags/, &hVfsIosDst);
165	if (RT_SUCCESS(rc))
166	{
167	rc = RTVfsUtilPumpIoStreams(hVfsIosSrc, hVfsIosDst, (size_t)RT_ALIGN(ObjInfo.cbObject, _4K));
168	RTVfsIoStrmRelease(hVfsIosDst);
169	}
170	RTVfsIoStrmRelease(hVfsIosSrc);
171	}
172	/*
173	* Symbolic links.
174	*/
175	else if (RTFS_IS_SYMLINK(ObjInfo.Attr.fMode))
176	{
177	RTVFSSYMLINK hVfsSymlink = RTVfsObjToSymlink(hVfsObj);
178	AssertReturn(hVfsSymlink != NIL_RTVFSSYMLINK, VERR_WRONG_TYPE);
179
180	AssertFailedStmt(rc = VERR_NOT_IMPLEMENTED);
181	RT_NOREF(pThis);
182
183	RTVfsSymlinkRelease(hVfsSymlink);
184	}
185	/*
186	* Directories.
187	*/
188	else if (RTFS_IS_DIRECTORY(ObjInfo.Attr.fMode))
189	AssertFailedStmt(rc = VERR_NOT_IMPLEMENTED);
190	/*
191	* And whatever else we need when we need it...
192	*/
193	else
194	AssertFailedStmt(rc = VERR_NOT_IMPLEMENTED);
195
196	return rc;
197	}
198
199
200	/**
201	* @interface_method_impl{RTVFSFSSTREAMOPS,pfnPushFile}
202	*/
203	static DECLCALLBACK(int) rtVfsFssToDir_PushFile(void pvThis, const char pszPath, uint64_t cbFile, PCRTFSOBJINFO paObjInfo,
204	uint32_t cObjInfo, uint32_t fFlags, PRTVFSIOSTREAM phVfsIos)
205	{
206	PRTVFSFSSWRITE2DIR pThis = (PRTVFSFSSWRITE2DIR)pvThis;
207	RT_NOREF(cbFile, fFlags);
208	int rc;
209
210	#ifndef RTVFSFSS2DIR_USE_DIR
211	/*
212	* Join up the path with the base dir and make sure it fits.
213	*/
214	char szFullPath[RTPATH_MAX];
215	rc = RTPathJoin(szFullPath, sizeof(szFullPath), pThis->szBaseDir, pszPath);
216	if (RT_SUCCESS(rc))
217	{
218	#endif
219	/*
220	* Create an undo entry for it.
221	*/
222	size_t const cbRelativePath = strlen(pszPath);
223	PRTVFSFSSWRITE2DIRENTRY pEntry;
224	pEntry = (PRTVFSFSSWRITE2DIRENTRY)RTMemAllocVar(RT_UOFFSETOF_DYN(RTVFSFSSWRITE2DIRENTRY, szName[cbRelativePath]));
225	if (pEntry)
226	{
227	if (cObjInfo)
228	pEntry->fMode = (paObjInfo[0].Attr.fMode & ~RTFS_TYPE_MASK) \| RTFS_TYPE_FILE;
229	else
230	pEntry->fMode = RTFS_TYPE_FILE \| 0664;
231	memcpy(pEntry->szName, pszPath, cbRelativePath);
232
233	/*
234	* Create the file.
235	*/
236	uint64_t fOpen = RTFILE_O_WRITE \| RTFILE_O_DENY_WRITE;
237	fOpen \|= ((pEntry->fMode & RTFS_UNIX_ALL_ACCESS_PERMS) << RTFILE_O_CREATE_MODE_SHIFT);
238	if (!(pThis->fFlags & RTVFSFSS2DIR_F_OVERWRITE_FILES))
239	fOpen \|= RTFILE_O_CREATE;
240	else
241	fOpen \|= RTFILE_O_CREATE_REPLACE;
242	#ifdef RTVFSFSS2DIR_USE_DIR
243	rc = RTVfsDirOpenFileAsIoStream(pThis->hVfsBaseDir, pszPath, fOpen, phVfsIos);
244	#else
245	rc = RTVfsIoStrmOpenNormal(szFullPath, fOpen, phVfsIos);
246	#endif
247	if (RT_SUCCESS(rc))
248	RTListAppend(&pThis->Entries, &pEntry->Entry);
249	else
250	RTMemFree(pEntry);
251	}
252	else
253	rc = VERR_NO_MEMORY;
254	#ifndef RTVFSFSS2DIR_USE_DIR
255	}
256	else if (rc == VERR_BUFFER_OVERFLOW)
257	rc = VERR_FILENAME_TOO_LONG;
258	#endif
259	return rc;
260	}
261
262
263	/**
264	* @interface_method_impl{RTVFSFSSTREAMOPS,pfnEnd}
265	*/
266	static DECLCALLBACK(int) rtVfsFssToDir_End(void *pvThis)
267	{
268	RT_NOREF(pvThis);
269	return VINF_SUCCESS;
270	}
271
272
273	/**
274	* The write-to-directory FSS operations.
275	*/
276	static const RTVFSFSSTREAMOPS g_rtVfsFssToDirOps =
277	{
278	{ /* Obj */
279	RTVFSOBJOPS_VERSION,
280	RTVFSOBJTYPE_FS_STREAM,
281	"TarFsStreamWriter",
282	rtVfsFssToDir_Close,
283	rtVfsFssToDir_QueryInfo,
284	RTVFSOBJOPS_VERSION
285	},
286	RTVFSFSSTREAMOPS_VERSION,
287	0,
288	NULL,
289	rtVfsFssToDir_Add,
290	rtVfsFssToDir_PushFile,
291	rtVfsFssToDir_End,
292	RTVFSFSSTREAMOPS_VERSION
293	};
294
295
296	#ifdef RTVFSFSS2DIR_USE_DIR
297	RTDECL(int) RTVfsFsStrmToDir(RTVFSDIR hVfsBaseDir, uint32_t fFlags, PRTVFSFSSTREAM phVfsFss)
298	{
299	/*
300	* Input validation.
301	*/
302	AssertPtrReturn(phVfsFss, VERR_INVALID_HANDLE);
303	*phVfsFss = NIL_RTVFSFSSTREAM;
304	AssertReturn(!(fFlags & ~RTVFSFSS2DIR_F_VALID_MASK), VERR_INVALID_FLAGS);
305	uint32_t cRefs = RTVfsDirRetain(hVfsBaseDir);
306	AssertReturn(cRefs != UINT32_MAX, VERR_INVALID_HANDLE);
307
308	/*
309	* Create the file system stream handle and init our data.
310	*/
311	PRTVFSFSSWRITE2DIR pThis;
312	RTVFSFSSTREAM hVfsFss;
313	int rc = RTVfsNewFsStream(&g_rtVfsFssToDirOps, sizeof(pThis), NIL_RTVFS, NIL_RTVFSLOCK, false /fReadOnly*/,
314	&hVfsFss, (void **)&pThis);
315	if (RT_SUCCESS(rc))
316	{
317	pThis->fFlags = fFlags;
318	pThis->cEntries = 0;
319	pThis->hVfsBaseDir = hVfsBaseDir;
320	RTListInit(&pThis->Entries);
321
322	*phVfsFss = hVfsFss;
323	return VINF_SUCCESS;
324	}
325	RTVfsDirRelease(hVfsBaseDir);
326
327	}
328	#endif /* RTVFSFSS2DIR_USE_DIR */
329
330
331	RTDECL(int) RTVfsFsStrmToNormalDir(const char *pszBaseDir, uint32_t fFlags, PRTVFSFSSTREAM phVfsFss)
332	{
333	#ifdef RTVFSFSS2DIR_USE_DIR
334	RTVFSDIR hVfsBaseDir;
335	int rc = RTVfsDirOpenNormal(pszBaseDir, 0 /fFlags/, &hVfsBaseDir);
336	if (RT_SUCCESS(rc))
337	{
338	rc = RTVfsFsStrmToDir(hVfsBaseDir, fFlags, phVfsFss);
339	RTVfsDirRelease(hVfsBaseDir);
340	}
341	#else
342
343	/*
344	* Input validation.
345	*/
346	AssertPtrReturn(phVfsFss, VERR_INVALID_HANDLE);
347	*phVfsFss = NIL_RTVFSFSSTREAM;
348	AssertReturn(!(fFlags & ~RTVFSFSS2DIR_F_VALID_MASK), VERR_INVALID_FLAGS);
349	AssertPtrReturn(pszBaseDir, VERR_INVALID_POINTER);
350	AssertReturn(*pszBaseDir != '\0', VERR_INVALID_NAME);
351
352	/*
353	* Straighten the path and make sure it's an existing directory.
354	*/
355	char szAbsPath[RTPATH_MAX];
356	int rc = RTPathAbs(pszBaseDir, szAbsPath, sizeof(szAbsPath));
357	if (RT_SUCCESS(rc))
358	{
359	RTFSOBJINFO ObjInfo;
360	rc = RTPathQueryInfo(szAbsPath, &ObjInfo, RTFSOBJATTRADD_NOTHING);
361	if (RT_SUCCESS(rc))
362	{
363	if (RTFS_IS_DIRECTORY(ObjInfo.Attr.fMode))
364	{
365	/*
366	* Create the file system stream handle and init our data.
367	*/
368	size_t const cbBaseDir = strlen(szAbsPath) + 1;
369	PRTVFSFSSWRITE2DIR pThis;
370	RTVFSFSSTREAM hVfsFss;
371	rc = RTVfsNewFsStream(&g_rtVfsFssToDirOps, RT_UOFFSETOF_DYN(RTVFSFSSWRITE2DIR, szBaseDir[cbBaseDir]),
372	NIL_RTVFS, NIL_RTVFSLOCK, false /fReadOnly/, &hVfsFss, (void **)&pThis);
373	if (RT_SUCCESS(rc))
374	{
375	pThis->fFlags = fFlags;
376	pThis->cEntries = 0;
377	RTListInit(&pThis->Entries);
378	memcpy(pThis->szBaseDir, szAbsPath, cbBaseDir);
379
380	*phVfsFss = hVfsFss;
381	return VINF_SUCCESS;
382	}
383	}
384	else
385	rc = VERR_NOT_A_DIRECTORY;
386	}
387	}
388	#endif
389	return rc;
390	}
391
392
393	RTDECL(int) RTVfsFsStrmToDirUndo(RTVFSFSSTREAM hVfsFss)
394	{
395	/*
396	* Validate input.
397	*/
398	PRTVFSFSSWRITE2DIR pThis = (PRTVFSFSSWRITE2DIR)RTVfsFsStreamToPrivate(hVfsFss, &g_rtVfsFssToDirOps);
399	AssertReturn(pThis, VERR_WRONG_TYPE);
400
401	/*
402	* Do the job, in reverse order. Dropping stuff we
403	* successfully remove from the list.
404	*/
405	int rc = VINF_SUCCESS;
406	PRTVFSFSSWRITE2DIRENTRY pCur;
407	PRTVFSFSSWRITE2DIRENTRY pPrev;
408	RTListForEachReverseSafe(&pThis->Entries, pCur, pPrev, RTVFSFSSWRITE2DIRENTRY, Entry)
409	{
410	#ifdef RTVFSFSS2DIR_USE_DIR
411	int rc2 = RTVfsDirUnlinkEntry(pThis->hVfsBaseDir, pCur->szName);
412	#else
413	char szFullPath[RTPATH_MAX];
414	int rc2 = RTPathJoin(szFullPath, sizeof(szFullPath), pThis->szBaseDir, pCur->szName);
415	AssertRC(rc2);
416	if (RT_SUCCESS(rc2))
417	rc2 = RTPathUnlink(szFullPath, 0 /fUnlink/);
418	#endif
419	if ( RT_SUCCESS(rc2)
420	\|\| rc2 == VERR_PATH_NOT_FOUND
421	\|\| rc2 == VERR_FILE_NOT_FOUND
422	\|\| rc2 == VERR_NOT_FOUND)
423	{
424	RTListNodeRemove(&pCur->Entry);
425	RTMemFree(pCur);
426	}
427	else if (RT_SUCCESS(rc))
428	rc = rc2;
429	}
430	return rc;
431	}
432

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source: vbox/trunk/src/VBox/Runtime/common/vfs/vfsfss2dir.cpp@ 83743

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