1 /*
2  * Copyright (c) 2019 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/types.h>
18 #include <sys/stat.h>
19 #include <sys/queue.h>
20 
21 #include <errno.h>
22 #include <fcntl.h>
23 #include <stdio.h>
24 #include <stdlib.h>
25 #include <string.h>
26 #include <stdint.h>
27 #include <sha1.h>
28 #include <unistd.h>
29 #include <zlib.h>
30 
31 #include "got_error.h"
32 #include "got_object.h"
33 #include "got_repository.h"
34 #include "got_opentemp.h"
35 
36 #include "got_lib_sha1.h"
37 #include "got_lib_deflate.h"
38 #include "got_lib_delta.h"
39 #include "got_lib_object.h"
40 #include "got_lib_lockfile.h"
41 #include "got_lib_path.h"
42 
43 #ifndef nitems
44 #define nitems(_a) (sizeof(_a) / sizeof((_a)[0]))
45 #endif
46 
47 const struct got_error *
48 got_object_blob_create(struct got_object_id **id, const char *ondisk_path,
49     struct got_repository *repo)
50 {
51 	const struct got_error *err = NULL, *unlock_err = NULL;
52 	char *header = NULL, *objpath = NULL, *outpath = NULL;
53 	FILE *blobfile = NULL, *outfile = NULL;
54 	int fd = -1;
55 	struct stat sb;
56 	SHA1_CTX sha1_ctx;
57 	uint8_t digest[SHA1_DIGEST_LENGTH];
58 	struct got_lockfile *lf = NULL;
59 	size_t outlen = 0, headerlen = 0;
60 
61 	*id = NULL;
62 
63 	SHA1Init(&sha1_ctx);
64 
65 	fd = open(ondisk_path, O_RDONLY | O_NOFOLLOW);
66 	if (fd == -1)
67 		return got_error_from_errno();
68 
69 	if (fstat(fd, &sb) == -1) {
70 		err = got_error_from_errno();
71 		goto done;
72 	}
73 
74 	if (asprintf(&header, "%s %lld", GOT_OBJ_LABEL_BLOB,
75 		sb.st_size) == -1) {
76 		err = got_error_from_errno();
77 		goto done;
78 	}
79 	headerlen = strlen(header) + 1;
80 	SHA1Update(&sha1_ctx, header, headerlen);
81 
82 	blobfile = got_opentemp();
83 	if (blobfile == NULL) {
84 		err = got_error_from_errno();
85 		goto done;
86 	}
87 
88 	outlen = fwrite(header, 1, headerlen, blobfile);
89 	if (outlen != headerlen) {
90 		err = got_ferror(blobfile, GOT_ERR_IO);
91 		goto done;
92 	}
93 	while (1) {
94 		char buf[8192];
95 		ssize_t inlen;
96 		size_t outlen;
97 
98 		inlen = read(fd, buf, sizeof(buf));
99 		if (inlen == -1) {
100 			err = got_error_from_errno();
101 			goto done;
102 		}
103 		if (inlen == 0)
104 			break; /* EOF */
105 		SHA1Update(&sha1_ctx, buf, inlen);
106 		outlen = fwrite(buf, 1, inlen, blobfile);
107 		if (outlen != inlen) {
108 			err = got_ferror(blobfile, GOT_ERR_IO);
109 			goto done;
110 		}
111 	}
112 
113 	SHA1Final(digest, &sha1_ctx);
114 	*id = malloc(sizeof(**id));
115 	if (*id == NULL) {
116 		err = got_error_from_errno();
117 		goto done;
118 	}
119 	memcpy((*id)->sha1, digest, SHA1_DIGEST_LENGTH);
120 
121 	if (fflush(blobfile) != 0) {
122 		err = got_error_from_errno();
123 		goto done;
124 	}
125 	rewind(blobfile);
126 
127 	err = got_object_get_path(&objpath, *id, repo);
128 	if (err)
129 		goto done;
130 
131 	err = got_opentemp_named(&outpath, &outfile, objpath);
132 	if (err) {
133 		char *parent_path;
134 		if (!(err->code == GOT_ERR_ERRNO && errno == ENOENT))
135 			goto done;
136 		err = got_path_dirname(&parent_path, objpath);
137 		if (err)
138 			goto done;
139 		err = got_path_mkdir(parent_path);
140 		free(parent_path);
141 		if (err)
142 			goto done;
143 		err = got_opentemp_named(&outpath, &outfile, objpath);
144 		if (err)
145 			goto done;
146 	}
147 
148 	err = got_deflate_to_file(&outlen, blobfile, outfile);
149 	if (err)
150 		goto done;
151 
152 	err = got_lockfile_lock(&lf, objpath);
153 	if (err)
154 		goto done;
155 
156 	if (rename(outpath, objpath) != 0) {
157 		err = got_error_from_errno();
158 		goto done;
159 	}
160 	free(outpath);
161 	outpath = NULL;
162 
163 	if (chmod(objpath, GOT_DEFAULT_FILE_MODE) != 0) {
164 		err = got_error_from_errno();
165 		goto done;
166 	}
167 done:
168 	free(header);
169 	free(objpath);
170 	if (outpath) {
171 		if (unlink(outpath) != 0 && err == NULL)
172 			err = got_error_from_errno();
173 		free(outpath);
174 	}
175 	if (fd != -1 && close(fd) != 0 && err == NULL)
176 		err = got_error_from_errno();
177 	if (blobfile && fclose(blobfile) != 0 && err == NULL)
178 		err = got_error_from_errno();
179 	if (outfile && fclose(outfile) != 0 && err == NULL)
180 		err = got_error_from_errno();
181 	if (err) {
182 		free(*id);
183 		*id = NULL;
184 	}
185 	if (lf)
186 		unlock_err = got_lockfile_unlock(lf);
187 	return err ? err : unlock_err;
188 }