1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/******************************************************/
/* tpax: a topological pax implementation */
/* Copyright (C) 2020 Z. Gilboa */
/* Released under GPLv2 and GPLv3; see COPYING.TPAX. */
/******************************************************/
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <sys/stat.h>
#include <tpax/tpax.h>
#include <tpax/tpax_specs.h>
#include "tpax_driver_impl.h"
#include "tpax_tmpfile_impl.h"
#include "tpax_errinfo_impl.h"
#ifndef ssizeof
#define ssizeof(x) (ssize_t)(sizeof(x))
#endif
static int tpax_archive_append_memory_data(
int fdout,
void * buf,
ssize_t nbytes)
{
ssize_t ret;
char * ch;
for (ch=buf; nbytes; ch+=ret) {
ret = write(fdout,ch,nbytes);
while ((ret < 0) && (errno == EINTR))
ret = write(fdout,ch,nbytes);
if (ret < 0)
return ret;
nbytes -= ret;
}
return 0;
}
static int tpax_archive_append_pad(
int fdout,
const struct stat * st)
{
ssize_t nbytes;
char buf[512];
nbytes = st->st_size;
nbytes += 0x1ff;
nbytes |= 0x1ff;
nbytes ^= 0x1ff;
nbytes -= st->st_size;
memset(buf,0,nbytes);
return tpax_archive_append_memory_data(
fdout,buf,nbytes);
}
int tpax_archive_append(
const struct tpax_driver_ctx * dctx,
const struct tpax_unit_ctx * uctx)
{
struct tpax_ustar_header uhdr;
int fdout;
int fdtmp;
ssize_t nread;
ssize_t nbytes;
void * buf;
size_t buflen;
size_t cmplen;
void * membuf;
char sbuf[2048];
/* record errors */
tpax_driver_set_ectx(
dctx,0,
*uctx->path);
/* driver */
fdout = tpax_driver_fdout(dctx);
/* header */
if (tpax_init_ustar_header(
dctx,*uctx->path,uctx->st,
*uctx->link,&uhdr) < 0)
return TPAX_NESTED_ERROR(dctx);
/* buffer */
membuf = 0;
fdtmp = -1;
if ((buf = tpax_get_driver_anon_map_addr(dctx,&buflen)))
if (buflen >= (cmplen = uctx->st->st_size))
membuf = buf;
if (ssizeof(sbuf) >= (uctx->st->st_size))
membuf = sbuf;
/* snapshot */
if (membuf) {
if (tpax_file_create_memory_snapshot(
dctx,*uctx->path,
uctx->st,membuf) < 0)
return TPAX_NESTED_ERROR(dctx);
} else {
if ((fdtmp = tpax_file_create_tmpfs_snapshot(
dctx,*uctx->path,
uctx->st)) < 0)
return TPAX_NESTED_ERROR(dctx);
if (lseek(fdtmp,0,SEEK_SET) < 0)
return TPAX_SYSTEM_ERROR(dctx);
}
/* append header */
if (tpax_archive_append_memory_data(fdout,&uhdr,ssizeof(uhdr)) < 0) {
if (fdtmp >= 0)
close(fdtmp);
return TPAX_SYSTEM_ERROR(dctx);
}
/* append data from snapshot */
if (fdtmp >= 0) {
if (!buf) {
buf = sbuf;
buflen = sizeof(sbuf);
}
for (nread=0; nread<uctx->st->st_size; ) {
nbytes = read(fdtmp,buf,buflen);
while ((nbytes < 0) && (errno == EINTR))
nbytes = read(fdtmp,buf,buflen);
if (nbytes < 0) {
close(fdtmp);
return TPAX_SYSTEM_ERROR(dctx);
} else if (nbytes == 0) {
close(fdtmp);
return TPAX_CUSTOM_ERROR(dctx,TPAX_ERR_FLOW_ERROR);
} else {
nread += nbytes;
}
if (tpax_archive_append_memory_data(fdout,buf,nbytes) < 0) {
close(fdtmp);
return TPAX_SYSTEM_ERROR(dctx);
}
}
close(fdtmp);
} else {
if (tpax_archive_append_memory_data(
fdout,membuf,
uctx->st->st_size) < 0)
return TPAX_SYSTEM_ERROR(dctx);
}
return tpax_archive_append_pad(
fdout,uctx->st);
}
|
