updater.c revision fb2e3af3f915c0e3f2b4b027ef26777267ad46dc 
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// Where in the package we expect to find the edify script to execute.
27// (Note it's "updateR-script", not the older "update-script".)
28#define SCRIPT_NAME "META-INF/com/google/android/updater-script"
29
30int main(int argc, char** argv) {
31    if (argc != 4) {
32        fprintf(stderr, "unexpected number of arguments (%d)\n", argc);
33        return 1;
34    }
35
36    char* version = argv[1];
37    if ((version[0] != '1' && version[0] != '2') || version[1] != '\0') {
38        // We support version "1" or "2".
39        fprintf(stderr, "wrong updater binary API; expected 1 or 2, got %s\n",
40                argv[1]);
41        return 2;
42    }
43
44    // Set up the pipe for sending commands back to the parent process.
45
46    int fd = atoi(argv[2]);
47    FILE* cmd_pipe = fdopen(fd, "wb");
48    setlinebuf(cmd_pipe);
49
50    // Extract the script from the package.
51
52    char* package_data = argv[3];
53    ZipArchive za;
54    int err;
55    err = mzOpenZipArchive(package_data, &za);
56    if (err != 0) {
57        fprintf(stderr, "failed to open package %s: %s\n",
58                package_data, strerror(err));
59        return 3;
60    }
61
62    const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
63    if (script_entry == NULL) {
64        fprintf(stderr, "failed to find %s in %s\n", SCRIPT_NAME, package_data);
65        return 4;
66    }
67
68    char* script = malloc(script_entry->uncompLen+1);
69    if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
70        fprintf(stderr, "failed to read script from package\n");
71        return 5;
72    }
73    script[script_entry->uncompLen] = '\0';
74
75    // Configure edify's functions.
76
77    RegisterBuiltins();
78    RegisterInstallFunctions();
79    FinishRegistration();
80
81    // Parse the script.
82
83    Expr* root;
84    int error_count = 0;
85    yy_scan_string(script);
86    int error = yyparse(&root, &error_count);
87    if (error != 0 || error_count > 0) {
88        fprintf(stderr, "%d parse errors\n", error_count);
89        return 6;
90    }
91
92    // Evaluate the parsed script.
93
94    UpdaterInfo updater_info;
95    updater_info.cmd_pipe = cmd_pipe;
96    updater_info.package_zip = &za;
97
98    State state;
99    state.cookie = &updater_info;
100    state.script = script;
101    state.errmsg = NULL;
102
103    char* result = Evaluate(&state, root);
104    if (result == NULL) {
105        if (state.errmsg == NULL) {
106            fprintf(stderr, "script aborted (no error message)\n");
107            fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
108        } else {
109            fprintf(stderr, "script aborted: %s\n", state.errmsg);
110            char* line = strtok(state.errmsg, "\n");
111            while (line) {
112                fprintf(cmd_pipe, "ui_print %s\n", line);
113                line = strtok(NULL, "\n");
114            }
115            fprintf(cmd_pipe, "ui_print\n");
116        }
117        free(state.errmsg);
118        return 7;
119    } else {
120        fprintf(stderr, "script result was [%s]\n", result);
121        free(result);
122    }
123
124    mzCloseZipArchive(&za);
125    free(script);
126
127    return 0;
128}
129