1 /*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <stdlib.h>
20
21 #include "edify/expr.h"
22 #include "updater.h"
23 #include "install.h"
24 #include "minzip/Zip.h"
25
26 // Generated by the makefile, this function defines the
27 // RegisterDeviceExtensions() function, which calls all the
28 // registration functions for device-specific extensions.
29 #include "register.inc"
30
31 // Where in the package we expect to find the edify script to execute.
32 // (Note it's "updateR-script", not the older "update-script".)
33 #define SCRIPT_NAME "META-INF/com/google/android/updater-script"
34
main(int argc,char ** argv)35 int main(int argc, char** argv) {
36 // Various things log information to stdout or stderr more or less
37 // at random. The log file makes more sense if buffering is
38 // turned off so things appear in the right order.
39 setbuf(stdout, NULL);
40 setbuf(stderr, NULL);
41
42 if (argc != 4) {
43 fprintf(stderr, "unexpected number of arguments (%d)\n", argc);
44 return 1;
45 }
46
47 char* version = argv[1];
48 if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
49 version[1] != '\0') {
50 // We support version 1, 2, or 3.
51 fprintf(stderr, "wrong updater binary API; expected 1, 2, or 3; "
52 "got %s\n",
53 argv[1]);
54 return 2;
55 }
56
57 // Set up the pipe for sending commands back to the parent process.
58
59 int fd = atoi(argv[2]);
60 FILE* cmd_pipe = fdopen(fd, "wb");
61 setlinebuf(cmd_pipe);
62
63 // Extract the script from the package.
64
65 char* package_data = argv[3];
66 ZipArchive za;
67 int err;
68 err = mzOpenZipArchive(package_data, &za);
69 if (err != 0) {
70 fprintf(stderr, "failed to open package %s: %s\n",
71 package_data, strerror(err));
72 return 3;
73 }
74
75 const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
76 if (script_entry == NULL) {
77 fprintf(stderr, "failed to find %s in %s\n", SCRIPT_NAME, package_data);
78 return 4;
79 }
80
81 char* script = malloc(script_entry->uncompLen+1);
82 if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
83 fprintf(stderr, "failed to read script from package\n");
84 return 5;
85 }
86 script[script_entry->uncompLen] = '\0';
87
88 // Configure edify's functions.
89
90 RegisterBuiltins();
91 RegisterInstallFunctions();
92 RegisterDeviceExtensions();
93 FinishRegistration();
94
95 // Parse the script.
96
97 Expr* root;
98 int error_count = 0;
99 yy_scan_string(script);
100 int error = yyparse(&root, &error_count);
101 if (error != 0 || error_count > 0) {
102 fprintf(stderr, "%d parse errors\n", error_count);
103 return 6;
104 }
105
106 // Evaluate the parsed script.
107
108 UpdaterInfo updater_info;
109 updater_info.cmd_pipe = cmd_pipe;
110 updater_info.package_zip = &za;
111 updater_info.version = atoi(version);
112
113 State state;
114 state.cookie = &updater_info;
115 state.script = script;
116 state.errmsg = NULL;
117
118 char* result = Evaluate(&state, root);
119 if (result == NULL) {
120 if (state.errmsg == NULL) {
121 fprintf(stderr, "script aborted (no error message)\n");
122 fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
123 } else {
124 fprintf(stderr, "script aborted: %s\n", state.errmsg);
125 char* line = strtok(state.errmsg, "\n");
126 while (line) {
127 fprintf(cmd_pipe, "ui_print %s\n", line);
128 line = strtok(NULL, "\n");
129 }
130 fprintf(cmd_pipe, "ui_print\n");
131 }
132 free(state.errmsg);
133 return 7;
134 } else {
135 fprintf(stderr, "script result was [%s]\n", result);
136 free(result);
137 }
138
139 if (updater_info.package_zip) {
140 mzCloseZipArchive(updater_info.package_zip);
141 }
142 free(script);
143
144 return 0;
145 }
146