#include <errno.h>
#include <apti18n.h>
+/* this method implements a patch functionality similar to "patch --ed" that is
+ * used by the "tiffany" incremental packages download stuff. it differs from
+ * "ed" insofar that it is way more restricted (and therefore secure). in the
+ * moment only the "c", "a" and "d" commands of ed are implemented (diff
+ * doesn't output any other). additionally the records must be reverse sorted
+ * by line number and may not overlap (diff *seems* to produce this kind of
+ * output).
+ * */
+
const char *Prog;
class RredMethod : public pkgAcqMethod
{
+ bool Debug;
+ // the size of this doesn't really matter (except for performance)
+ const static int BUF_SIZE = 1024;
+ // the ed commands
+ enum Mode {MODE_CHANGED, MODE_DELETED, MODE_ADDED};
+ // return values
+ enum State {ED_OK, ED_ORDERING, ED_PARSER, ED_FAILURE};
+ // this applies a single hunk, it uses a tail recursion to
+ // reverse the hunks in the file
+ int ed_rec(FILE *ed_cmds, FILE *in_file, FILE *out_file, int line,
+ char *buffer, unsigned int bufsize, Hashes *hash);
+ // apply a patch file
+ int ed_file(FILE *ed_cmds, FILE *in_file, FILE *out_file, Hashes *hash);
+ // the methods main method
virtual bool Fetch(FetchItem *Itm);
public:
RredMethod() : pkgAcqMethod("1.1",SingleInstance | SendConfig) {};
-
};
-#define BUF_SIZE (1024)
-
-// XXX use enums
-#define MODE_CHANGED 0
-#define MODE_DELETED 1
-#define MODE_ADDED 2
-
-#define ED_OK 0
-#define ED_ORDERING 1
-#define ED_PARSER 2
-#define ED_FAILURE 3
-
-// XXX someone better go out and understand the error reporting/handling here...
-int ed_rec(FILE *ed_cmds, FILE *in_file, FILE *out_file, int line,
- char *buffer, unsigned int bufsize, Hashes *hash) {
- int pos;
- int startline;
- int stopline;
- int mode;
- int written;
- char *idx;
-
- /* get the current command and parse it*/
- if (fgets(buffer, bufsize, ed_cmds) == NULL) {
- return line;
- }
- startline = strtol(buffer, &idx, 10);
- if (startline < line) {
- return ED_ORDERING;
- }
- if (*idx == ',') {
- idx++;
- stopline = strtol(idx, &idx, 10);
- }
- else {
- stopline = startline;
- }
- if (*idx == 'c') {
- mode = MODE_CHANGED;
- }
- else if (*idx == 'a') {
- mode = MODE_ADDED;
- }
- else if (*idx == 'd') {
- mode = MODE_DELETED;
- }
- else {
- return ED_PARSER;
- }
- /* get the current position */
- pos = ftell(ed_cmds);
- /* if this is add or change then go to the next full stop */
- if ((mode == MODE_CHANGED) || (mode == MODE_ADDED)) {
- do {
- fgets(buffer, bufsize, ed_cmds);
- while ((strlen(buffer) == (bufsize - 1))
- && (buffer[bufsize - 2] != '\n')) {
- fgets(buffer, bufsize, ed_cmds);
- buffer[0] = ' ';
- }
- } while (strncmp(buffer, ".", 1) != 0);
- }
- /* do the recursive call */
- line = ed_rec(ed_cmds, in_file, out_file, line, buffer, bufsize,
- hash);
- /* pass on errors */
- if (line < 0) {
- return line;
- }
- /* apply our hunk */
- fseek(ed_cmds, pos, SEEK_SET);
- /* first wind to the current position */
- if (mode != MODE_ADDED) {
- startline -= 1;
- }
- while (line < startline) {
- fgets(buffer, bufsize, in_file);
- written = fwrite(buffer, 1, strlen(buffer), out_file);
- hash->Add((unsigned char*)buffer, written);
- while ((strlen(buffer) == (bufsize - 1))
- && (buffer[bufsize - 2] != '\n')) {
- fgets(buffer, bufsize, in_file);
- written = fwrite(buffer, 1, strlen(buffer), out_file);
- hash->Add((unsigned char*)buffer, written);
- }
- line++;
- }
- /* include from ed script */
- if ((mode == MODE_ADDED) || (mode == MODE_CHANGED)) {
- do {
- fgets(buffer, bufsize, ed_cmds);
- if (strncmp(buffer, ".", 1) != 0) {
- written = fwrite(buffer, 1, strlen(buffer), out_file);
- hash->Add((unsigned char*)buffer, written);
- while ((strlen(buffer) == (bufsize - 1))
- && (buffer[bufsize - 2] != '\n')) {
- fgets(buffer, bufsize, ed_cmds);
- written = fwrite(buffer, 1, strlen(buffer), out_file);
- hash->Add((unsigned char*)buffer, written);
- }
- }
- else {
- break;
- }
- } while (1);
- }
- /* ignore the corresponding number of lines from input */
- if ((mode == MODE_DELETED) || (mode == MODE_CHANGED)) {
- while (line < stopline) {
- fgets(buffer, bufsize, in_file);
- while ((strlen(buffer) == (bufsize - 1))
- && (buffer[bufsize - 2] != '\n')) {
- fgets(buffer, bufsize, in_file);
- }
- line++;
- }
- }
- return line;
+int RredMethod::ed_rec(FILE *ed_cmds, FILE *in_file, FILE *out_file, int line,
+ char *buffer, unsigned int bufsize, Hashes *hash) {
+ int pos;
+ int startline;
+ int stopline;
+ int mode;
+ int written;
+ char *idx;
+
+ /* get the current command and parse it*/
+ if (fgets(buffer, bufsize, ed_cmds) == NULL) {
+ return line;
+ }
+ startline = strtol(buffer, &idx, 10);
+ if (startline < line) {
+ return ED_ORDERING;
+ }
+ if (*idx == ',') {
+ idx++;
+ stopline = strtol(idx, &idx, 10);
+ }
+ else {
+ stopline = startline;
+ }
+ if (*idx == 'c') {
+ mode = MODE_CHANGED;
+ if (Debug == true) {
+ std::clog << "changing from line " << startline
+ << " to " << stopline << std::endl;
+ }
+ }
+ else if (*idx == 'a') {
+ mode = MODE_ADDED;
+ if (Debug == true) {
+ std::clog << "adding after line " << startline << std::endl;
+ }
+ }
+ else if (*idx == 'd') {
+ mode = MODE_DELETED;
+ if (Debug == true) {
+ std::clog << "deleting from line " << startline
+ << " to " << stopline << std::endl;
+ }
+ }
+ else {
+ return ED_PARSER;
+ }
+ /* get the current position */
+ pos = ftell(ed_cmds);
+ /* if this is add or change then go to the next full stop */
+ if ((mode == MODE_CHANGED) || (mode == MODE_ADDED)) {
+ do {
+ fgets(buffer, bufsize, ed_cmds);
+ while ((strlen(buffer) == (bufsize - 1))
+ && (buffer[bufsize - 2] != '\n')) {
+ fgets(buffer, bufsize, ed_cmds);
+ buffer[0] = ' ';
+ }
+ } while (strncmp(buffer, ".", 1) != 0);
+ }
+ /* do the recursive call */
+ line = ed_rec(ed_cmds, in_file, out_file, line, buffer, bufsize,
+ hash);
+ /* pass on errors */
+ if (line < 0) {
+ return line;
+ }
+ /* apply our hunk */
+ fseek(ed_cmds, pos, SEEK_SET);
+ /* first wind to the current position */
+ if (mode != MODE_ADDED) {
+ startline -= 1;
+ }
+ while (line < startline) {
+ fgets(buffer, bufsize, in_file);
+ written = fwrite(buffer, 1, strlen(buffer), out_file);
+ hash->Add((unsigned char*)buffer, written);
+ while ((strlen(buffer) == (bufsize - 1))
+ && (buffer[bufsize - 2] != '\n')) {
+ fgets(buffer, bufsize, in_file);
+ written = fwrite(buffer, 1, strlen(buffer), out_file);
+ hash->Add((unsigned char*)buffer, written);
+ }
+ line++;
+ }
+ /* include from ed script */
+ if ((mode == MODE_ADDED) || (mode == MODE_CHANGED)) {
+ do {
+ fgets(buffer, bufsize, ed_cmds);
+ if (strncmp(buffer, ".", 1) != 0) {
+ written = fwrite(buffer, 1, strlen(buffer), out_file);
+ hash->Add((unsigned char*)buffer, written);
+ while ((strlen(buffer) == (bufsize - 1))
+ && (buffer[bufsize - 2] != '\n')) {
+ fgets(buffer, bufsize, ed_cmds);
+ written = fwrite(buffer, 1, strlen(buffer), out_file);
+ hash->Add((unsigned char*)buffer, written);
+ }
+ }
+ else {
+ break;
+ }
+ } while (1);
+ }
+ /* ignore the corresponding number of lines from input */
+ if ((mode == MODE_DELETED) || (mode == MODE_CHANGED)) {
+ while (line < stopline) {
+ fgets(buffer, bufsize, in_file);
+ while ((strlen(buffer) == (bufsize - 1))
+ && (buffer[bufsize - 2] != '\n')) {
+ fgets(buffer, bufsize, in_file);
+ }
+ line++;
+ }
+ }
+ return line;
}
-int ed_file(FILE *ed_cmds, FILE *in_file, FILE *out_file, Hashes *hash) {
- char buffer[BUF_SIZE];
- int result;
- int written;
-
- /* we do a tail recursion to read the commands in the right order */
- result = ed_rec(ed_cmds, in_file, out_file, 0, buffer, BUF_SIZE,
- hash);
-
- /* read the rest from infile */
- if (result > 0) {
- while (fgets(buffer, BUF_SIZE, in_file) != NULL) {
- written = fwrite(buffer, 1, strlen(buffer), out_file);
- hash->Add((unsigned char*)buffer, written);
- }
- }
- else {
- // XXX better error handling
- fprintf(stderr, "Error: %i\n", result);
- return ED_FAILURE;
- }
- return ED_OK;
+int RredMethod::ed_file(FILE *ed_cmds, FILE *in_file, FILE *out_file,
+ Hashes *hash) {
+ char buffer[BUF_SIZE];
+ int result;
+ int written;
+
+ /* we do a tail recursion to read the commands in the right order */
+ result = ed_rec(ed_cmds, in_file, out_file, 0, buffer, BUF_SIZE,
+ hash);
+
+ /* read the rest from infile */
+ if (result > 0) {
+ while (fgets(buffer, BUF_SIZE, in_file) != NULL) {
+ written = fwrite(buffer, 1, strlen(buffer), out_file);
+ hash->Add((unsigned char*)buffer, written);
+ }
+ }
+ else {
+ return ED_FAILURE;
+ }
+ return ED_OK;
}
-// XXX do we need modification times as well?
bool RredMethod::Fetch(FetchItem *Itm)
{
+ Debug = _config->FindB("Debug::pkgAcquire::RRed",false);
URI Get = Itm->Uri;
string Path = Get.Host + Get.Path; // To account for relative paths
// Path contains the filename to patch
URIStart(Res);
// Res.Filename the destination filename
+ if (Debug == true)
+ std::clog << "Patching " << Path << " with " << Path
+ << ".ed and putting result into " << Itm->DestFile << std::endl;
// Open the source and destination files (the d'tor of FileFd will do
// the cleanup/closing of the fds)
FileFd From(Path,FileFd::ReadOnly);
FILE* fTo = fdopen(To.Fd(), "w");
// now do the actual patching
if (ed_file(fPatch, fFrom, fTo, &Hash) != ED_OK) {
+ _error->Errno("rred", _("Could not patch file"));
return false;
}
return true;
}
- /*}}}*/
int main(int argc, char *argv[])
{
projects / apt.git / blobdiff