annotate toys/pending/cpio.c @ 1227:903acf85bd1d draft

Most of the remaining cpio cleanup.
author Rob Landley <rob@landley.net>
date Mon, 24 Mar 2014 08:19:21 -0500
parents a7d5b93111a5
children 2366f9d73745
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* cpio.c - a basic cpio
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2 *
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3 * Written 2013 AD by Isaac Dunham; this code is placed under the
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4 * same license as toybox or as CC0, at your option.
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5 *
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6 * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cpio.html
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7 * and http://pubs.opengroup.org/onlinepubs/7908799/xcu/cpio.html
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8 *
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9 * Yes, that's SUSv2, the newer standards removed it around the time RPM
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10 * and initramfs started heavily using this archive format.
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11 *
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12 * Modern cpio expanded header to 110 bytes (first field 6 bytes, rest are 8).
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13 * In order: magic ino mode uid gid nlink mtime filesize devmajor devminor
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14 * rdevmajor rdevminor namesize check
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15
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16 USE_CPIO(NEWTOY(cpio, "duH:i|t|F:o|v(verbose)[!io][!ot]", TOYFLAG_BIN))
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17
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18 config CPIO
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19 bool "cpio"
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20 default n
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21 help
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22 usage: cpio -{o|t|i} [-v] [--verbose] [-F FILE] [ignored: -du -H newc]
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24 copy files into and out of a "newc" format cpio archive
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25
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26 -F FILE use archive FILE instead of stdin/stdout
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27 -i extract from archive into file system (stdin=archive)
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28 -o create archive (stdin=list of files, stdout=archive)
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29 -t test files (list only, stdin=archive, stdout=list of files)
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30 -v verbose (list files during create/extract)
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31 */
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32
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33 #define FOR_cpio
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34 #include "toys.h"
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35
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36 GLOBALS(
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37 char *archive;
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38 char *fmt;
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39 )
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40
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41 // Read strings, tail padded to 4 byte alignment. Argument "align" is amount
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42 // by which start of string isn't aligned (usually 0).
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43 static char *strpad(int fd, unsigned len, unsigned align)
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44 {
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45 char *str;
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46
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47 align = (align + len) & 3;
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48 if (align) len += (4-align);
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49
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50 xreadall(fd, str = xmalloc(len+1), len);
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51 str[len]=0; // redundant, in case archive is bad
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52
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53 return str;
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54 }
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55
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56 //convert hex to uint; mostly to allow using bits of non-terminated strings
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57 unsigned x8u(char *hex)
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58 {
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59 unsigned val, inpos = 8, outpos;
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60 char pattern[6];
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61
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62 while (*hex == '0') {
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63 hex++;
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64 if (!--inpos) return 0;
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65 }
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66 // Because scanf gratuitously treats %*X differently than printf does.
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67 sprintf(pattern, "%%%dX%%n", inpos);
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68 sscanf(hex, pattern, &val, &outpos);
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69 if (inpos != outpos) error_exit("bad header");
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70
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71 return val;
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72 }
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73
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74 void cpio_main(void)
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75 {
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76 int afd;
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77
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78 // Subtle bit: FLAG_o is 1 so we can just use it to select stdin/stdout.
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79
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80 afd = toys.optflags & FLAG_o;
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81 if (TT.archive) {
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82 int perm = (toys.optflags & FLAG_o) ? O_CREAT|O_WRONLY|O_TRUNC : O_RDONLY;
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83
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84 afd = xcreate(TT.archive, perm, 0644);
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85 }
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86
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87 // read cpio archive
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88
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89 if (toys.optflags & (FLAG_i|FLAG_t)) for (;;) {
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90 char *name, *tofree, *data;
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91 unsigned size, mode;
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92 int test = toys.optflags & FLAG_t, err = 0;
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93
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94 // Read header and name.
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95 xreadall(afd, toybuf, 110);
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96 tofree = name = strpad(afd, x8u(toybuf+94), 110);
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97 if (!strcmp("TRAILER!!!", name)) break;
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98
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99 // If you want to extract absolute paths, "cd /" and run cpio.
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100 while (*name == '/') name++;
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101
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102 // Align to 4 bytes. Note header is 110 bytes which is 2 bytes over.
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103
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104 size = x8u(toybuf+54);
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105 mode = x8u(toybuf+14);
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106
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107 if (toys.optflags & (FLAG_t|FLAG_v)) puts(name);
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108
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109 if (!test && strrchr(name, '/') && mkpathat(AT_FDCWD, name, 0, 2)) {
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110 perror_msg("mkpath '%s'", name);
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111 test++;
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112 }
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113
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114 // Consume entire record even if it couldn't create file, so we're
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115 // properly aligned with next file.
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116
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117 if (S_ISDIR(mode)) {
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118 if (!test) err = mkdir(name, mode);
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119 } else if (S_ISLNK(mode)) {
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120 data = strpad(afd, size, 0);
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121 if (!test) err = symlink(data, name);
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122 } else if (S_ISREG(mode)) {
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123 int fd;
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124
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125 // If write fails, we still need to read/discard data to continue with
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126 // archive. Since doing so overwrites errno, report error now
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127 fd = test ? 0 : open(name, O_CREAT|O_WRONLY|O_TRUNC|O_NOFOLLOW, mode);
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128 if (fd < 0) {
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129 perror_msg("create %s", name);
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130 test++;
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131 }
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132
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133 data = toybuf;
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134 while (size) {
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135 if (size < sizeof(toybuf)) data = strpad(afd, size, 0);
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136 else xreadall(afd, toybuf, sizeof(toybuf));
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
137 if (!test) xwrite(fd, data, data == toybuf ? sizeof(toybuf) : size);
903acf85bd1d Most of the remaining cpio cleanup.
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diff changeset
138 if (data != toybuf) {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
139 free(data);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
140 break;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
141 }
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
142 size -= sizeof(toybuf);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
143 }
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
144 close(fd);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
145 } else if (!test)
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
146 err = mknod(name, mode, makedev(x8u(toybuf+62), x8u(toybuf+70)));
903acf85bd1d Most of the remaining cpio cleanup.
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diff changeset
147
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
148 if (err<0) perror_msg("create '%s'", name);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
149 free(tofree);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
150
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
151 // Output cpio archive
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
152
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
153 } else {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
154 char *name = 0;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
155 size_t size = 0;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
156
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
157 for (;;) {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
158 struct stat st;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
159 unsigned nlen = strlen(name)+1, error = 0, zero = 0;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
160 int len, fd;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
161 ssize_t llen;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
162
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
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diff changeset
163 len = getline(&name, &size, stdin);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
164 if (len<1) break;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
165 if (name[len-1] == '\n') name[--len] = 0;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
166 if (lstat(name, &st) || (fd = open(name, O_RDONLY))<0) {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
167 perror_msg("%s", name);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
168 continue;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
169 }
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
170
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
171 if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode)) st.st_size = 0;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
172 if (st.st_size >> 32) perror_msg("skipping >2G file '%s'", name);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
173 else {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
174 llen = sprintf(toybuf,
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
175 "070701%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X%08X",
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
176 (int)st.st_ino, st.st_mode, st.st_uid, st.st_gid, (int)st.st_nlink,
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
177 (int)st.st_mtime, (int)st.st_size, major(st.st_dev),
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
178 minor(st.st_dev), major(st.st_rdev), minor(st.st_rdev), nlen, 0);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
179 xwrite(afd, toybuf, llen);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
180 xwrite(afd, name, nlen);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
181
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
182 // NUL Pad header up to 4 multiple bytes.
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
183 llen = (llen + nlen) & 3;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
184 if (llen) xwrite(afd, &zero, 4-llen);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
185
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
186 // Write out body for symlink or regular file
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
187 llen = st.st_size;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
188 if (S_ISLNK(st.st_mode)) {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
189 if (readlink(name, toybuf, sizeof(toybuf)-1) == llen)
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
190 xwrite(afd, toybuf, llen);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
191 else perror_msg("readlink '%s'", name);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
192 } else while (llen) {
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
193 nlen = llen > sizeof(toybuf) ? sizeof(toybuf) : llen;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
194 // If read fails, write anyway (already wrote size in header)
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
195 if (nlen != readall(fd, toybuf, nlen))
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
196 if (!error++) perror_msg("bad read from file '%s'", name);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
197 xwrite(afd, toybuf, nlen);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
198 }
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
199 llen = st.st_size & 3;
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
200 if (nlen) write(afd, &zero, 4-llen);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
201 }
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
202 close(fd);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
203 }
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
204 free(name);
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
205
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
206 xwrite(afd, toybuf,
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
207 sprintf(toybuf, "070701%040X%056X%08XTRAILER!!!%c%c%c",
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
208 1, 0x0b, 0, 0, 0, 0));
903acf85bd1d Most of the remaining cpio cleanup.
Rob Landley <rob@landley.net>
parents: 1223
diff changeset
209 }
1087
b73a61542297 I've finally gotten 'cpio' into a shape where it could be useable.
Isaac Dunham <ibid.ag@gmail.com>
parents:
diff changeset
210 }