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2bb04905 LC |
1 | #define _XOPEN_SOURCE 600 |
2 | ||
36457566 LC |
3 | #include "config.h" |
4 | ||
5 | #include <cerrno> | |
6 | #include <algorithm> | |
7 | #include <vector> | |
2bb04905 LC |
8 | #include <map> |
9 | ||
10 | #include <strings.h> // for strcasecmp | |
36457566 | 11 | |
36457566 LC |
12 | #include <sys/types.h> |
13 | #include <sys/stat.h> | |
14 | #include <unistd.h> | |
15 | #include <dirent.h> | |
16 | #include <fcntl.h> | |
17 | ||
18 | #include "archive.hh" | |
19 | #include "util.hh" | |
20 | ||
21 | ||
22 | namespace nix { | |
23 | ||
36457566 LC |
24 | static string archiveVersion1 = "nix-archive-1"; |
25 | ||
2bb04905 | 26 | static string caseHackSuffix = "~nix~case~hack~"; |
36457566 LC |
27 | |
28 | PathFilter defaultPathFilter; | |
29 | ||
30 | ||
2bb04905 | 31 | static void dumpContents(const Path & path, size_t size, |
36457566 LC |
32 | Sink & sink) |
33 | { | |
34 | writeString("contents", sink); | |
35 | writeLongLong(size, sink); | |
36 | ||
37 | AutoCloseFD fd = open(path.c_str(), O_RDONLY); | |
38 | if (fd == -1) throw SysError(format("opening file `%1%'") % path); | |
2bb04905 | 39 | |
36457566 LC |
40 | unsigned char buf[65536]; |
41 | size_t left = size; | |
42 | ||
43 | while (left > 0) { | |
44 | size_t n = left > sizeof(buf) ? sizeof(buf) : left; | |
45 | readFull(fd, buf, n); | |
46 | left -= n; | |
47 | sink(buf, n); | |
48 | } | |
49 | ||
50 | writePadding(size, sink); | |
51 | } | |
52 | ||
53 | ||
54 | static void dump(const Path & path, Sink & sink, PathFilter & filter) | |
55 | { | |
56 | struct stat st; | |
57 | if (lstat(path.c_str(), &st)) | |
58 | throw SysError(format("getting attributes of path `%1%'") % path); | |
59 | ||
60 | writeString("(", sink); | |
61 | ||
62 | if (S_ISREG(st.st_mode)) { | |
63 | writeString("type", sink); | |
64 | writeString("regular", sink); | |
65 | if (st.st_mode & S_IXUSR) { | |
66 | writeString("executable", sink); | |
67 | writeString("", sink); | |
68 | } | |
69 | dumpContents(path, (size_t) st.st_size, sink); | |
2bb04905 | 70 | } |
36457566 LC |
71 | |
72 | else if (S_ISDIR(st.st_mode)) { | |
73 | writeString("type", sink); | |
74 | writeString("directory", sink); | |
2bb04905 LC |
75 | |
76 | /* If we're on a case-insensitive system like Mac OS X, undo | |
77 | the case hack applied by restorePath(). */ | |
78 | std::map<string, string> unhacked; | |
79 | for (auto & i : readDirectory(path)) | |
7eca7892 | 80 | unhacked[i.name] = i.name; |
2bb04905 LC |
81 | |
82 | for (auto & i : unhacked) | |
83 | if (filter(path + "/" + i.first)) { | |
84 | writeString("entry", sink); | |
85 | writeString("(", sink); | |
86 | writeString("name", sink); | |
87 | writeString(i.first, sink); | |
88 | writeString("node", sink); | |
89 | dump(path + "/" + i.second, sink, filter); | |
90 | writeString(")", sink); | |
91 | } | |
36457566 LC |
92 | } |
93 | ||
94 | else if (S_ISLNK(st.st_mode)) { | |
95 | writeString("type", sink); | |
96 | writeString("symlink", sink); | |
97 | writeString("target", sink); | |
98 | writeString(readLink(path), sink); | |
99 | } | |
100 | ||
15ddeff5 | 101 | else throw Error(format("file `%1%' has an unsupported type") % path); |
36457566 LC |
102 | |
103 | writeString(")", sink); | |
104 | } | |
105 | ||
106 | ||
107 | void dumpPath(const Path & path, Sink & sink, PathFilter & filter) | |
108 | { | |
109 | writeString(archiveVersion1, sink); | |
110 | dump(path, sink, filter); | |
111 | } | |
112 | ||
113 | ||
114 | static SerialisationError badArchive(string s) | |
115 | { | |
116 | return SerialisationError("bad archive: " + s); | |
117 | } | |
118 | ||
119 | ||
2bb04905 | 120 | #if 0 |
36457566 LC |
121 | static void skipGeneric(Source & source) |
122 | { | |
123 | if (readString(source) == "(") { | |
124 | while (readString(source) != ")") | |
125 | skipGeneric(source); | |
126 | } | |
127 | } | |
2bb04905 | 128 | #endif |
36457566 LC |
129 | |
130 | ||
131 | static void parseContents(ParseSink & sink, Source & source, const Path & path) | |
132 | { | |
133 | unsigned long long size = readLongLong(source); | |
2bb04905 | 134 | |
36457566 LC |
135 | sink.preallocateContents(size); |
136 | ||
137 | unsigned long long left = size; | |
138 | unsigned char buf[65536]; | |
139 | ||
140 | while (left) { | |
141 | checkInterrupt(); | |
142 | unsigned int n = sizeof(buf); | |
143 | if ((unsigned long long) n > left) n = left; | |
144 | source(buf, n); | |
145 | sink.receiveContents(buf, n); | |
146 | left -= n; | |
147 | } | |
148 | ||
149 | readPadding(size, source); | |
150 | } | |
151 | ||
152 | ||
2bb04905 LC |
153 | struct CaseInsensitiveCompare |
154 | { | |
155 | bool operator() (const string & a, const string & b) const | |
156 | { | |
157 | return strcasecmp(a.c_str(), b.c_str()) < 0; | |
158 | } | |
159 | }; | |
160 | ||
161 | ||
36457566 LC |
162 | static void parse(ParseSink & sink, Source & source, const Path & path) |
163 | { | |
164 | string s; | |
165 | ||
166 | s = readString(source); | |
167 | if (s != "(") throw badArchive("expected open tag"); | |
168 | ||
169 | enum { tpUnknown, tpRegular, tpDirectory, tpSymlink } type = tpUnknown; | |
170 | ||
2bb04905 LC |
171 | std::map<Path, int, CaseInsensitiveCompare> names; |
172 | ||
36457566 LC |
173 | while (1) { |
174 | checkInterrupt(); | |
175 | ||
176 | s = readString(source); | |
177 | ||
178 | if (s == ")") { | |
179 | break; | |
180 | } | |
181 | ||
182 | else if (s == "type") { | |
183 | if (type != tpUnknown) | |
184 | throw badArchive("multiple type fields"); | |
185 | string t = readString(source); | |
186 | ||
187 | if (t == "regular") { | |
188 | type = tpRegular; | |
189 | sink.createRegularFile(path); | |
190 | } | |
191 | ||
192 | else if (t == "directory") { | |
193 | sink.createDirectory(path); | |
194 | type = tpDirectory; | |
195 | } | |
196 | ||
197 | else if (t == "symlink") { | |
198 | type = tpSymlink; | |
199 | } | |
2bb04905 | 200 | |
36457566 | 201 | else throw badArchive("unknown file type " + t); |
2bb04905 | 202 | |
36457566 LC |
203 | } |
204 | ||
205 | else if (s == "contents" && type == tpRegular) { | |
206 | parseContents(sink, source, path); | |
207 | } | |
208 | ||
209 | else if (s == "executable" && type == tpRegular) { | |
210 | readString(source); | |
211 | sink.isExecutable(); | |
212 | } | |
213 | ||
214 | else if (s == "entry" && type == tpDirectory) { | |
2bb04905 LC |
215 | string name, prevName; |
216 | ||
217 | s = readString(source); | |
218 | if (s != "(") throw badArchive("expected open tag"); | |
219 | ||
220 | while (1) { | |
221 | checkInterrupt(); | |
222 | ||
223 | s = readString(source); | |
224 | ||
225 | if (s == ")") { | |
226 | break; | |
227 | } else if (s == "name") { | |
228 | name = readString(source); | |
229 | if (name.empty() || name == "." || name == ".." || name.find('/') != string::npos || name.find((char) 0) != string::npos) | |
230 | throw Error(format("NAR contains invalid file name `%1%'") % name); | |
231 | if (name <= prevName) | |
232 | throw Error("NAR directory is not sorted"); | |
233 | prevName = name; | |
2bb04905 LC |
234 | } else if (s == "node") { |
235 | if (s.empty()) throw badArchive("entry name missing"); | |
236 | parse(sink, source, path + "/" + name); | |
237 | } else | |
238 | throw badArchive("unknown field " + s); | |
239 | } | |
36457566 LC |
240 | } |
241 | ||
242 | else if (s == "target" && type == tpSymlink) { | |
243 | string target = readString(source); | |
244 | sink.createSymlink(path, target); | |
245 | } | |
246 | ||
2bb04905 | 247 | else |
36457566 | 248 | throw badArchive("unknown field " + s); |
36457566 LC |
249 | } |
250 | } | |
251 | ||
252 | ||
253 | void parseDump(ParseSink & sink, Source & source) | |
254 | { | |
2bb04905 | 255 | string version; |
36457566 LC |
256 | try { |
257 | version = readString(source); | |
258 | } catch (SerialisationError & e) { | |
259 | /* This generally means the integer at the start couldn't be | |
260 | decoded. Ignore and throw the exception below. */ | |
261 | } | |
262 | if (version != archiveVersion1) | |
8327e733 | 263 | throw badArchive("input doesn't look like a normalized archive"); |
36457566 LC |
264 | parse(sink, source, ""); |
265 | } | |
266 | ||
267 | ||
268 | struct RestoreSink : ParseSink | |
269 | { | |
270 | Path dstPath; | |
271 | AutoCloseFD fd; | |
272 | ||
273 | void createDirectory(const Path & path) | |
274 | { | |
275 | Path p = dstPath + path; | |
276 | if (mkdir(p.c_str(), 0777) == -1) | |
277 | throw SysError(format("creating directory `%1%'") % p); | |
278 | }; | |
279 | ||
280 | void createRegularFile(const Path & path) | |
281 | { | |
282 | Path p = dstPath + path; | |
283 | fd.close(); | |
284 | fd = open(p.c_str(), O_CREAT | O_EXCL | O_WRONLY, 0666); | |
285 | if (fd == -1) throw SysError(format("creating file `%1%'") % p); | |
286 | } | |
287 | ||
288 | void isExecutable() | |
289 | { | |
290 | struct stat st; | |
291 | if (fstat(fd, &st) == -1) | |
292 | throw SysError("fstat"); | |
293 | if (fchmod(fd, st.st_mode | (S_IXUSR | S_IXGRP | S_IXOTH)) == -1) | |
294 | throw SysError("fchmod"); | |
295 | } | |
296 | ||
297 | void preallocateContents(unsigned long long len) | |
298 | { | |
299 | #if HAVE_POSIX_FALLOCATE | |
300 | if (len) { | |
301 | errno = posix_fallocate(fd, 0, len); | |
302 | /* Note that EINVAL may indicate that the underlying | |
303 | filesystem doesn't support preallocation (e.g. on | |
304 | OpenSolaris). Since preallocation is just an | |
305 | optimisation, ignore it. */ | |
306 | if (errno && errno != EINVAL) | |
307 | throw SysError(format("preallocating file of %1% bytes") % len); | |
308 | } | |
309 | #endif | |
310 | } | |
311 | ||
312 | void receiveContents(unsigned char * data, unsigned int len) | |
313 | { | |
314 | writeFull(fd, data, len); | |
315 | } | |
316 | ||
317 | void createSymlink(const Path & path, const string & target) | |
318 | { | |
319 | Path p = dstPath + path; | |
320 | nix::createSymlink(target, p); | |
321 | } | |
322 | }; | |
323 | ||
2bb04905 | 324 | |
36457566 LC |
325 | void restorePath(const Path & path, Source & source) |
326 | { | |
327 | RestoreSink sink; | |
328 | sink.dstPath = path; | |
329 | parseDump(sink, source); | |
330 | } | |
331 | ||
2bb04905 | 332 | |
36457566 | 333 | } |