/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <ctype.h>
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#include <errno.h>
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#include <getopt.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/*
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* Append a tag to a property value in a .prop file if it isn't already there.
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* Normally used to modify build properties to record incremental updates.
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*/
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// Return nonzero if the tag should be added to this line.
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int should_tag(const char *line, const char *propname) {
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const char *prop = strstr(line, propname);
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if (prop == NULL) return 0;
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// Make sure this is actually the property name (not an accidental hit)
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const char *ptr;
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for (ptr = line; ptr < prop && isspace(*ptr); ++ptr) ;
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if (ptr != prop) return 0; // Must be at the beginning of the line
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for (ptr += strlen(propname); *ptr != '\0' && isspace(*ptr); ++ptr) ;
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return (*ptr == '='); // Must be followed by a '='
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}
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// Remove existing tags from the line, return the following number (if any)
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int remove_tag(char *line, const char *tag) {
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char *pos = strstr(line, tag);
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if (pos == NULL) return 0;
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char *end;
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int num = strtoul(pos + strlen(tag), &end, 10);
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strcpy(pos, end);
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return num;
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}
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// Write line to output with the tag added, adding a number (if >0)
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void write_tagged(FILE *out, const char *line, const char *tag, int number) {
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const char *end = line + strlen(line);
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while (end > line && isspace(end[-1])) --end;
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if (number > 0) {
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fprintf(out, "%.*s%s%d%s", end - line, line, tag, number, end);
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} else {
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fprintf(out, "%.*s%s%s", end - line, line, tag, end);
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}
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}
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int main(int argc, char **argv) {
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const char *filename = "/system/build.prop";
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const char *propname = "ro.build.fingerprint";
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const char *tag = NULL;
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int do_remove = 0, do_number = 0;
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int opt;
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while ((opt = getopt(argc, argv, "f:p:rn")) != -1) {
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switch (opt) {
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case 'f': filename = optarg; break;
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case 'p': propname = optarg; break;
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case 'r': do_remove = 1; break;
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case 'n': do_number = 1; break;
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case '?': return 2;
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}
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}
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if (argc != optind + 1) {
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fprintf(stderr,
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"usage: add-property-tag [flags] tag-to-add\n"
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"flags: -f /dir/file.prop (default /system/build.prop)\n"
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" -p prop.name (default ro.build.fingerprint)\n"
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" -r (if set, remove the tag rather than adding it)\n"
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" -n (if set, add and increment a number after the tag)\n");
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return 2;
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}
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tag = argv[optind];
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FILE *input = fopen(filename, "r");
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if (input == NULL) {
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fprintf(stderr, "can't read %s: %s\n", filename, strerror(errno));
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return 1;
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}
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char tmpname[PATH_MAX];
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snprintf(tmpname, sizeof(tmpname), "%s.tmp", filename);
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FILE *output = fopen(tmpname, "w");
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if (output == NULL) {
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fprintf(stderr, "can't write %s: %s\n", tmpname, strerror(errno));
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return 1;
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}
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int found = 0;
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char line[4096];
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while (fgets(line, sizeof(line), input)) {
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if (!should_tag(line, propname)) {
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fputs(line, output); // Pass through unmodified
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} else {
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found = 1;
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int number = remove_tag(line, tag);
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if (do_remove) {
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fputs(line, output); // Remove the tag but don't re-add it
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} else {
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write_tagged(output, line, tag, number + do_number);
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}
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}
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}
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fclose(input);
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fclose(output);
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if (!found) {
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fprintf(stderr, "property %s not found in %s\n", propname, filename);
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remove(tmpname);
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return 1;
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}
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if (rename(tmpname, filename)) {
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fprintf(stderr, "can't rename %s to %s: %s\n",
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tmpname, filename, strerror(errno));
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remove(tmpname);
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return 1;
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}
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return 0;
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}
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