add wrapper around dpkg to be able to use it easily in the tests

[apt.git] / apt-pkg / contrib / fileutl.cc

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 62d42e4da8abe8e84a6706273e13a9da6fac22df..2b73d142488de5cbcc647705273d2a51e102e4a2 100644 (file)
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -11,6 +11,7 @@
    Most of this source is placed in the Public Domain, do with it what 
    you will
    It was originally written by Jason Gunthorpe <jgg@debian.org>.
+   FileFd gzip support added by Martin Pitt <martin.pitt@canonical.com>
    
    The exception is RunScripts() it is under the GPLv2
 
@@ -308,7 +309,8 @@ std::vector<string> GetListOfFilesInDir(string const &Dir, std::vector<string> c
            {
               if (Debug == true)
                  std::clog << "Bad file: " << Ent->d_name << " → no extension" << std::endl;
-              _error->Notice("Ignoring file '%s' in directory '%s' as it has no filename extension", Ent->d_name, Dir.c_str());
+              if (SilentIgnore.Match(Ent->d_name) == false)
+                 _error->Notice("Ignoring file '%s' in directory '%s' as it has no filename extension", Ent->d_name, Dir.c_str());
               continue;
            }
         }
@@ -656,8 +658,19 @@ bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
       case ReadOnly:
       iFd = open(FileName.c_str(),O_RDONLY);
       break;
+
+      case ReadOnlyGzip:
+      iFd = open(FileName.c_str(),O_RDONLY);
+      if (iFd > 0) {
+        gz = gzdopen (iFd, "r");
+        if (gz == NULL) {
+            close (iFd);
+            iFd = -1;
+        }
+      }
+      break;
       
-      case WriteEmpty:
+      case WriteAtomic:
       {
         Flags |= Replace;
         char *name = strdup((FileName + ".XXXXXX").c_str());
@@ -666,6 +679,15 @@ bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
         free(name);
         break;
       }
+
+      case WriteEmpty:
+      {
+        struct stat Buf;
+        if (lstat(FileName.c_str(),&Buf) == 0 && S_ISLNK(Buf.st_mode))
+           unlink(FileName.c_str());
+        iFd = open(FileName.c_str(),O_RDWR | O_CREAT | O_TRUNC,Perms);
+        break;
+      }
       
       case WriteExists:
       iFd = open(FileName.c_str(),O_RDWR);
@@ -688,6 +710,24 @@ bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)
    SetCloseExec(iFd,true);
    return true;
 }
+
+bool FileFd::OpenDescriptor(int Fd, OpenMode Mode, bool AutoClose)
+{
+   Close();
+   Flags = (AutoClose) ? FileFd::AutoClose : 0;
+   iFd = Fd;
+   if (Mode == ReadOnlyGzip) {
+      gz = gzdopen (iFd, "r");
+      if (gz == NULL) {
+        if (AutoClose)
+           close (iFd);
+        return _error->Errno("gzdopen",_("Could not open file descriptor %d"),
+                             Fd);
+      }
+   }
+   this->FileName = "";
+   return true;
+}
                                                                        /*}}}*/
 // FileFd::~File - Closes the file                                     /*{{{*/
 // ---------------------------------------------------------------------
@@ -711,7 +751,10 @@ bool FileFd::Read(void *To,unsigned long Size,unsigned long *Actual)
    
    do
    {
-      Res = read(iFd,To,Size);
+      if (gz != NULL)
+         Res = gzread(gz,To,Size);
+      else
+         Res = read(iFd,To,Size);
       if (Res < 0 && errno == EINTR)
         continue;
       if (Res < 0)
@@ -750,7 +793,10 @@ bool FileFd::Write(const void *From,unsigned long Size)
    errno = 0;
    do
    {
-      Res = write(iFd,From,Size);
+      if (gz != NULL)
+         Res = gzwrite(gz,From,Size);
+      else
+         Res = write(iFd,From,Size);
       if (Res < 0 && errno == EINTR)
         continue;
       if (Res < 0)
@@ -776,7 +822,12 @@ bool FileFd::Write(const void *From,unsigned long Size)
 /* */
 bool FileFd::Seek(unsigned long To)
 {
-   if (lseek(iFd,To,SEEK_SET) != (signed)To)
+   int res;
+   if (gz)
+      res = gzseek(gz,To,SEEK_SET);
+   else
+      res = lseek(iFd,To,SEEK_SET);
+   if (res != (signed)To)
    {
       Flags |= Fail;
       return _error->Error("Unable to seek to %lu",To);
@@ -790,7 +841,12 @@ bool FileFd::Seek(unsigned long To)
 /* */
 bool FileFd::Skip(unsigned long Over)
 {
-   if (lseek(iFd,Over,SEEK_CUR) < 0)
+   int res;
+   if (gz)
+      res = gzseek(gz,Over,SEEK_CUR);
+   else
+      res = lseek(iFd,Over,SEEK_CUR);
+   if (res < 0)
    {
       Flags |= Fail;
       return _error->Error("Unable to seek ahead %lu",Over);
@@ -804,6 +860,11 @@ bool FileFd::Skip(unsigned long Over)
 /* */
 bool FileFd::Truncate(unsigned long To)
 {
+   if (gz)
+   {
+      Flags |= Fail;
+      return _error->Error("Truncating gzipped files is not implemented (%s)", FileName.c_str());
+   }
    if (ftruncate(iFd,To) != 0)
    {
       Flags |= Fail;
@@ -818,7 +879,11 @@ bool FileFd::Truncate(unsigned long To)
 /* */
 unsigned long FileFd::Tell()
 {
-   off_t Res = lseek(iFd,0,SEEK_CUR);
+   off_t Res;
+   if (gz)
+     Res = gztell(gz);
+   else
+     Res = lseek(iFd,0,SEEK_CUR);
    if (Res == (off_t)-1)
       _error->Errno("lseek","Failed to determine the current file position");
    return Res;
@@ -829,6 +894,7 @@ unsigned long FileFd::Tell()
 /* */
 unsigned long FileFd::Size()
 {
+   //TODO: For gz, do we need the actual file size here or the uncompressed length?
    struct stat Buf;
    if (fstat(iFd,&Buf) != 0)
       return _error->Errno("fstat","Unable to determine the file size");
@@ -842,20 +908,31 @@ bool FileFd::Close()
 {
    bool Res = true;
    if ((Flags & AutoClose) == AutoClose)
-      if (iFd >= 0 && close(iFd) != 0)
-        Res &= _error->Errno("close",_("Problem closing the file"));
-   iFd = -1;
+   {
+      if (gz != NULL) {
+        int const e = gzclose(gz);
+        // gzdopen() on empty files always fails with "buffer error" here, ignore that
+        if (e != 0 && e != Z_BUF_ERROR)
+           Res &= _error->Errno("close",_("Problem closing the gzip file %s"), FileName.c_str());
+      } else
+        if (iFd > 0 && close(iFd) != 0)
+           Res &= _error->Errno("close",_("Problem closing the file %s"), FileName.c_str());
+   }
 
-   if ((Flags & Replace) == Replace) {
+   if ((Flags & Replace) == Replace && iFd >= 0) {
       if (rename(TemporaryFileName.c_str(), FileName.c_str()) != 0)
-        Res &= _error->Errno("rename",_("Problem renaming the file"));
+        Res &= _error->Errno("rename",_("Problem renaming the file %s to %s"), TemporaryFileName.c_str(), FileName.c_str());
+
       FileName = TemporaryFileName; // for the unlink() below.
    }
-           
+
+   iFd = -1;
+   gz = NULL;
+
    if ((Flags & Fail) == Fail && (Flags & DelOnFail) == DelOnFail &&
        FileName.empty() == false)
       if (unlink(FileName.c_str()) != 0)
-        Res &= _error->WarningE("unlnk",_("Problem unlinking the file"));
+        Res &= _error->WarningE("unlnk",_("Problem unlinking the file %s"), FileName.c_str());
 
 
    return Res;