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      1 #include "files.h"
      2 #include <stdio.h>
      3 #include <string.h>
      4 #include <stdlib.h>
      5 #include <errno.h>
      6 #include <sys/stat.h>
      7 #include <unistd.h>
      8 #include <dirent.h>
      9 #include <fnmatch.h>
     10 #include <string.h>
     11 #include <stdlib.h>
     12 
     13 static bool
     14 is_comment_line(const char* p)
     15 {
     16     while (*p && isspace(*p)) {
     17         p++;
     18     }
     19     return *p == '#';
     20 }
     21 
     22 static string
     23 path_append(const string& base, const string& leaf)
     24 {
     25     string full = base;
     26     if (base.length() > 0 && leaf.length() > 0) {
     27         full += '/';
     28     }
     29     full += leaf;
     30     return full;
     31 }
     32 
     33 static bool
     34 is_whitespace_line(const char* p)
     35 {
     36     while (*p) {
     37         if (!isspace(*p)) {
     38             return false;
     39         }
     40         p++;
     41     }
     42     return true;
     43 }
     44 
     45 static bool
     46 is_exclude_line(const char* p) {
     47     while (*p) {
     48         if (*p == '-') {
     49             return true;
     50         }
     51         else if (isspace(*p)) {
     52             p++;
     53         }
     54         else {
     55             return false;
     56         }
     57     }
     58     return false;
     59 }
     60 
     61 void
     62 split_line(const char* p, vector<string>* out)
     63 {
     64     const char* q = p;
     65     enum { WHITE, TEXT, IN_QUOTE } state = WHITE;
     66     while (*p) {
     67         if (*p == '#') {
     68             break;
     69         }
     70 
     71         switch (state)
     72         {
     73             case WHITE:
     74                 if (!isspace(*p)) {
     75                     q = p;
     76                     state = (*p == '"') ? IN_QUOTE : TEXT;
     77                 }
     78                 break;
     79             case IN_QUOTE:
     80                 if (*p == '"') {
     81                     state = TEXT;
     82                     break;
     83                 }
     84                 // otherwise fall-through to TEXT case
     85             case TEXT:
     86                 if (state != IN_QUOTE && isspace(*p)) {
     87                     if (q != p) {
     88                         const char* start = q;
     89                         size_t len = p-q;
     90                         if (len > 2 && *start == '"' && start[len - 1] == '"') {
     91                             start++;
     92                             len -= 2;
     93                         }
     94                         out->push_back(string(start, len));
     95                     }
     96                     state = WHITE;
     97                 }
     98                 break;
     99         }
    100         p++;
    101     }
    102     if (state == TEXT) {
    103         const char* start = q;
    104         size_t len = p-q;
    105         if (len > 2 && *start == '"' && start[len - 1] == '"') {
    106             start++;
    107             len -= 2;
    108         }
    109         out->push_back(string(start, len));
    110     }
    111 }
    112 
    113 static void
    114 add_file(vector<FileRecord>* files, const FileOpType fileOp,
    115             const string& listFile, int listLine,
    116             const string& sourceName, const string& outName)
    117 {
    118     FileRecord rec;
    119     rec.listFile = listFile;
    120     rec.listLine = listLine;
    121     rec.fileOp = fileOp;
    122     rec.sourceName = sourceName;
    123     rec.outName = outName;
    124     files->push_back(rec);
    125 }
    126 
    127 static string
    128 replace_variables(const string& input,
    129                   const map<string, string>& variables,
    130                   bool* error) {
    131     if (variables.empty()) {
    132         return input;
    133     }
    134 
    135     // Abort if the variable prefix is not found
    136     if (input.find("${") == string::npos) {
    137         return input;
    138     }
    139 
    140     string result = input;
    141 
    142     // Note: rather than be fancy to detect recursive replacements,
    143     // we simply iterate till a given threshold is met.
    144 
    145     int retries = 1000;
    146     bool did_replace;
    147 
    148     do {
    149         did_replace = false;
    150         for (map<string, string>::const_iterator it = variables.begin();
    151              it != variables.end(); ++it) {
    152             string::size_type pos = 0;
    153             while((pos = result.find(it->first, pos)) != string::npos) {
    154                 result = result.replace(pos, it->first.length(), it->second);
    155                 pos += it->second.length();
    156                 did_replace = true;
    157             }
    158         }
    159         if (did_replace && --retries == 0) {
    160             *error = true;
    161             fprintf(stderr, "Recursive replacement detected during variables "
    162                     "substitution. Full list of variables is: ");
    163 
    164             for (map<string, string>::const_iterator it = variables.begin();
    165                  it != variables.end(); ++it) {
    166                 fprintf(stderr, "  %s=%s\n",
    167                         it->first.c_str(), it->second.c_str());
    168             }
    169 
    170             return result;
    171         }
    172     } while (did_replace);
    173 
    174     return result;
    175 }
    176 
    177 int
    178 read_list_file(const string& filename,
    179                const map<string, string>& variables,
    180                vector<FileRecord>* files,
    181                vector<string>* excludes)
    182 {
    183     int err = 0;
    184     FILE* f = NULL;
    185     long size;
    186     char* buf = NULL;
    187     char *p, *q;
    188     int i, lineCount;
    189 
    190     f = fopen(filename.c_str(), "r");
    191     if (f == NULL) {
    192         fprintf(stderr, "Could not open list file (%s): %s\n",
    193                     filename.c_str(), strerror(errno));
    194         err = errno;
    195         goto cleanup;
    196     }
    197 
    198     err = fseek(f, 0, SEEK_END);
    199     if (err != 0) {
    200         fprintf(stderr, "Could not seek to the end of file %s. (%s)\n",
    201                     filename.c_str(), strerror(errno));
    202         err = errno;
    203         goto cleanup;
    204     }
    205 
    206     size = ftell(f);
    207 
    208     err = fseek(f, 0, SEEK_SET);
    209     if (err != 0) {
    210         fprintf(stderr, "Could not seek to the beginning of file %s. (%s)\n",
    211                     filename.c_str(), strerror(errno));
    212         err = errno;
    213         goto cleanup;
    214     }
    215 
    216     buf = (char*)malloc(size+1);
    217     if (buf == NULL) {
    218         // (potentially large)
    219         fprintf(stderr, "out of memory (%ld)\n", size);
    220         err = ENOMEM;
    221         goto cleanup;
    222     }
    223 
    224     if (1 != fread(buf, size, 1, f)) {
    225         fprintf(stderr, "error reading file %s. (%s)\n",
    226                     filename.c_str(), strerror(errno));
    227         err = errno;
    228         goto cleanup;
    229     }
    230 
    231     // split on lines
    232     p = buf;
    233     q = buf+size;
    234     lineCount = 0;
    235     while (p<q) {
    236         if (*p == '\r' || *p == '\n') {
    237             *p = '\0';
    238             lineCount++;
    239         }
    240         p++;
    241     }
    242 
    243     // read lines
    244     p = buf;
    245     for (i=0; i<lineCount; i++) {
    246         int len = strlen(p);
    247         q = p + len + 1;
    248         if (is_whitespace_line(p) || is_comment_line(p)) {
    249             ;
    250         }
    251         else if (is_exclude_line(p)) {
    252             while (*p != '-') p++;
    253             p++;
    254             excludes->push_back(string(p));
    255         }
    256         else {
    257             vector<string> words;
    258 
    259             split_line(p, &words);
    260 
    261 #if 0
    262             printf("[ ");
    263             for (size_t k=0; k<words.size(); k++) {
    264                 printf("'%s' ", words[k].c_str());
    265             }
    266             printf("]\n");
    267 #endif
    268             FileOpType op = FILE_OP_COPY;
    269             string paths[2];
    270             int pcount = 0;
    271             string errstr;
    272             for (vector<string>::iterator it = words.begin(); it != words.end(); ++it) {
    273                 const string& word = *it;
    274                 if (word == "rm") {
    275                     if (op != FILE_OP_COPY) {
    276                         errstr = "Error: you can only specifiy 'rm' or 'strip' once per line.";
    277                         break;
    278                     }
    279                     op = FILE_OP_REMOVE;
    280                 } else if (word == "strip") {
    281                     if (op != FILE_OP_COPY) {
    282                         errstr = "Error: you can only specifiy 'rm' or 'strip' once per line.";
    283                         break;
    284                     }
    285                     op = FILE_OP_STRIP;
    286                 } else if (pcount < 2) {
    287                     bool error = false;
    288                     paths[pcount++] = replace_variables(word, variables, &error);
    289                     if (error) {
    290                         err = 1;
    291                         goto cleanup;
    292                     }
    293                 } else {
    294                     errstr = "Error: More than 2 paths per line.";
    295                     break;
    296                 }
    297             }
    298 
    299             if (pcount == 0 && !errstr.empty()) {
    300                 errstr = "Error: No path found on line.";
    301             }
    302 
    303             if (!errstr.empty()) {
    304                 fprintf(stderr, "%s:%d: bad format: %s\n%s\nExpected: [SRC] [rm|strip] DEST\n",
    305                         filename.c_str(), i+1, p, errstr.c_str());
    306                 err = 1;
    307             } else {
    308                 if (pcount == 1) {
    309                     // pattern: [rm|strip] DEST
    310                     paths[1] = paths[0];
    311                 }
    312 
    313                 add_file(files, op, filename, i+1, paths[0], paths[1]);
    314             }
    315         }
    316         p = q;
    317     }
    318 
    319 cleanup:
    320     if (buf != NULL) {
    321         free(buf);
    322     }
    323     if (f != NULL) {
    324         fclose(f);
    325     }
    326     return err;
    327 }
    328 
    329 
    330 int
    331 locate(FileRecord* rec, const vector<string>& search)
    332 {
    333     if (rec->fileOp == FILE_OP_REMOVE) {
    334         // Don't touch source files when removing a destination.
    335         rec->sourceMod = 0;
    336         rec->sourceSize = 0;
    337         rec->sourceIsDir = false;
    338         return 0;
    339     }
    340 
    341     int err;
    342 
    343     for (vector<string>::const_iterator it=search.begin();
    344                 it!=search.end(); it++) {
    345         string full = path_append(*it, rec->sourceName);
    346         struct stat st;
    347         err = stat(full.c_str(), &st);
    348         if (err == 0) {
    349             rec->sourceBase = *it;
    350             rec->sourcePath = full;
    351             rec->sourceMod = st.st_mtime;
    352             rec->sourceSize = st.st_size;
    353             rec->sourceIsDir = S_ISDIR(st.st_mode);
    354             return 0;
    355         }
    356     }
    357 
    358     fprintf(stderr, "%s:%d: couldn't locate source file: %s\n",
    359                 rec->listFile.c_str(), rec->listLine, rec->sourceName.c_str());
    360     return 1;
    361 }
    362 
    363 void
    364 stat_out(const string& base, FileRecord* rec)
    365 {
    366     rec->outPath = path_append(base, rec->outName);
    367 
    368     int err;
    369     struct stat st;
    370     err = stat(rec->outPath.c_str(), &st);
    371     if (err == 0) {
    372         rec->outMod = st.st_mtime;
    373         rec->outSize = st.st_size;
    374         rec->outIsDir = S_ISDIR(st.st_mode);
    375     } else {
    376         rec->outMod = 0;
    377         rec->outSize = 0;
    378         rec->outIsDir = false;
    379     }
    380 }
    381 
    382 string
    383 dir_part(const string& filename)
    384 {
    385     int pos = filename.rfind('/');
    386     if (pos <= 0) {
    387         return ".";
    388     }
    389     return filename.substr(0, pos);
    390 }
    391 
    392 static void
    393 add_more(const string& entry, bool isDir,
    394          const FileRecord& rec, vector<FileRecord>*more)
    395 {
    396     FileRecord r;
    397     r.listFile = rec.listFile;
    398     r.listLine = rec.listLine;
    399     r.sourceName = path_append(rec.sourceName, entry);
    400     r.sourcePath = path_append(rec.sourceBase, r.sourceName);
    401     struct stat st;
    402     int err = stat(r.sourcePath.c_str(), &st);
    403     if (err == 0) {
    404         r.sourceMod = st.st_mtime;
    405     }
    406     r.sourceIsDir = isDir;
    407     r.outName = path_append(rec.outName, entry);
    408     more->push_back(r);
    409 }
    410 
    411 static bool
    412 matches_excludes(const char* file, const vector<string>& excludes)
    413 {
    414     for (vector<string>::const_iterator it=excludes.begin();
    415             it!=excludes.end(); it++) {
    416         if (0 == fnmatch(it->c_str(), file, FNM_PERIOD)) {
    417             return true;
    418         }
    419     }
    420     return false;
    421 }
    422 
    423 static int
    424 list_dir(const string& path, const FileRecord& rec,
    425                 const vector<string>& excludes,
    426                 vector<FileRecord>* more)
    427 {
    428     string full = path_append(rec.sourceBase, rec.sourceName);
    429     full = path_append(full, path);
    430 
    431     DIR *d = opendir(full.c_str());
    432     if (d == NULL) {
    433         return errno;
    434     }
    435 
    436     vector<string> dirs;
    437 
    438     struct dirent *ent;
    439     while (NULL != (ent = readdir(d))) {
    440         if (0 == strcmp(".", ent->d_name)
    441                 || 0 == strcmp("..", ent->d_name)) {
    442             continue;
    443         }
    444         if (matches_excludes(ent->d_name, excludes)) {
    445             continue;
    446         }
    447         string entry = path_append(path, ent->d_name);
    448         bool is_directory = (ent->d_type == DT_DIR);
    449         add_more(entry, is_directory, rec, more);
    450         if (is_directory) {
    451             dirs.push_back(entry);
    452         }
    453     }
    454     closedir(d);
    455 
    456     for (vector<string>::iterator it=dirs.begin(); it!=dirs.end(); it++) {
    457         list_dir(*it, rec, excludes, more);
    458     }
    459 
    460     return 0;
    461 }
    462 
    463 int
    464 list_dir(const FileRecord& rec, const vector<string>& excludes,
    465             vector<FileRecord>* files)
    466 {
    467     return list_dir("", rec, excludes, files);
    468 }
    469 
    470 FileRecord::FileRecord() {
    471     fileOp = FILE_OP_COPY;
    472 }
    473 
    474