Another error message for failed updates

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

diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index a761794eefd4d4ad6764cc0d1a4d9fca99ed394f..a2c6ab370553ebb4048a07d3f6a4e5dd917d1de9 100644 (file)
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/

-// $Id: fileutl.cc,v 1.22 1999/03/15 08:10:39 jgg Exp $
+// $Id: fileutl.cc,v 1.30 1999/07/26 17:46:08 jgg Exp $

 /* ######################################################################
    
    File Utilities
 /* ######################################################################
    
    File Utilities


@@ -25,6 +25,8 @@
 #include <sys/fcntl.h>
 #include <sys/types.h>
 #include <sys/time.h>
 #include <sys/fcntl.h>
 #include <sys/types.h>
 #include <sys/time.h>

+#include <signal.h>
+#include <wait.h>

 #include <errno.h>
                                                                        /*}}}*/
 
 #include <errno.h>
                                                                        /*}}}*/
 


@@ -38,14 +40,21 @@ bool CopyFile(FileFd &From,FileFd &To)
    
    // Buffered copy between fds
    unsigned char *Buf = new unsigned char[64000];
    
    // Buffered copy between fds
    unsigned char *Buf = new unsigned char[64000];

-   long Size;
-   while ((Size = read(From.Fd(),Buf,64000)) > 0)
+   unsigned long Size = From.Size();
+   while (Size != 0)

    {
    {

-      if (To.Write(Buf,Size) == false)
+      unsigned long ToRead = Size;
+      if (Size > 64000)
+        ToRead = 64000;
+      
+      if (From.Read(Buf,ToRead) == false || 
+         To.Write(Buf,ToRead) == false)

       {
         delete [] Buf;
         return false;
       }
       {
         delete [] Buf;
         return false;
       }

+      
+      Size -= ToRead;

    }
 
    delete [] Buf;
    }
 
    delete [] Buf;


@@ -76,6 +85,11 @@ int GetLock(string File,bool Errors)
    fl.l_len = 0;
    if (fcntl(FD,F_SETLK,&fl) == -1)
    {
    fl.l_len = 0;
    if (fcntl(FD,F_SETLK,&fl) == -1)
    {

+      if (errno == ENOLCK)
+      {
+        _error->Warning("Not using locking for nfs mounted lock file %s",File.c_str());
+        return true;
+      }      

       if (Errors == true)
         _error->Errno("open","Could not get lock %s",File.c_str());
       close(FD);
       if (Errors == true)
         _error->Errno("open","Could not get lock %s",File.c_str());
       close(FD);


@@ -175,25 +189,115 @@ bool WaitFd(int Fd,bool write,unsigned long timeout)
    tv.tv_sec = timeout;
    tv.tv_usec = 0;
    if (write == true) 
    tv.tv_sec = timeout;
    tv.tv_usec = 0;
    if (write == true) 

-   {
-      if (select(Fd+1,0,&Set,0,(timeout != 0?&tv:0)) <= 0)
-         return false;
+   {      
+      int Res;
+      do
+      {
+        Res = select(Fd+1,0,&Set,0,(timeout != 0?&tv:0));
+      }
+      while (Res < 0 && errno == EINTR);
+      
+      if (Res <= 0)
+        return false;

    } 
    else 
    {
    } 
    else 
    {

-      if (select(Fd+1,&Set,0,0,(timeout != 0?&tv:0)) <= 0)
-         return false;
+      int Res;
+      do
+      {
+        Res = select(Fd+1,&Set,0,0,(timeout != 0?&tv:0));
+      }
+      while (Res < 0 && errno == EINTR);
+      
+      if (Res <= 0)
+        return false;

    }
    
    return true;
 }
                                                                        /*}}}*/
    }
    
    return true;
 }
                                                                        /*}}}*/

+// ExecFork - Magical fork that sanitizes the context before execing   /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used if you want to cleanse the environment for the forked 
+   child, it fixes up the important signals and nukes all of the fds,
+   otherwise acts like normal fork. */
+int ExecFork()
+{
+   // Fork off the process
+   pid_t Process = fork();
+   if (Process < 0)
+   {
+      cerr << "FATAL -> Failed to fork." << endl;
+      exit(100);
+   }

 
 

-// FileFd::FileFd - Open a file                                                /*{{{*/
+   // Spawn the subprocess
+   if (Process == 0)
+   {
+      // Setup the signals
+      signal(SIGPIPE,SIG_DFL);
+      signal(SIGQUIT,SIG_DFL);
+      signal(SIGINT,SIG_DFL);
+      signal(SIGWINCH,SIG_DFL);
+      signal(SIGCONT,SIG_DFL);
+      signal(SIGTSTP,SIG_DFL);
+      
+      // Close all of our FDs - just in case
+      for (int K = 3; K != 40; K++)
+        fcntl(K,F_SETFD,FD_CLOEXEC);
+   }
+   
+   return Process;
+}
+                                                                       /*}}}*/
+// ExecWait - Fancy waitpid                                            /*{{{*/
+// ---------------------------------------------------------------------
+/* Waits for the given sub process. If Reap is set the no errors are 
+   generated. Otherwise a failed subprocess will generate a proper descriptive
+   message */
+bool ExecWait(int Pid,const char *Name,bool Reap)
+{
+   if (Pid <= 1)
+      return true;
+   
+   // Wait and collect the error code
+   int Status;
+   while (waitpid(Pid,&Status,0) != Pid)
+   {
+      if (errno == EINTR)
+        continue;
+
+      if (Reap == true)
+        return false;
+      
+      return _error->Error("Waited, for %s but it wasn't there",Name);
+   }
+
+   
+   // Check for an error code.
+   if (WIFEXITED(Status) == 0 || WEXITSTATUS(Status) != 0)
+   {
+      if (Reap == true)
+        return false;
+      if (WIFSIGNALED(Status) != 0 && WTERMSIG(Status) == SIGSEGV)
+        return _error->Error("Sub-process %s recieved a segmentation fault.",Name);
+
+      if (WIFEXITED(Status) != 0)
+        return _error->Error("Sub-process %s returned an error code (%u)",Name,WEXITSTATUS(Status));
+      
+      return _error->Error("Sub-process %s exited unexpectedly",Name);
+   }      
+   
+   return true;
+}
+                                                                       /*}}}*/
+
+// FileFd::Open - Open a file                                          /*{{{*/

 // ---------------------------------------------------------------------
 /* The most commonly used open mode combinations are given with Mode */
 // ---------------------------------------------------------------------
 /* The most commonly used open mode combinations are given with Mode */

-FileFd::FileFd(string FileName,OpenMode Mode, unsigned long Perms)
+bool FileFd::Open(string FileName,OpenMode Mode, unsigned long Perms)

 {
 {

+   Close();

    Flags = AutoClose;
    switch (Mode)
    {
    Flags = AutoClose;
    switch (Mode)
    {


@@ -220,12 +324,11 @@ FileFd::FileFd(string FileName,OpenMode Mode, unsigned long Perms)
    }  
 
    if (iFd < 0)
    }  
 
    if (iFd < 0)

-      _error->Errno("open","Could not open file %s",FileName.c_str());
-   else
-   {
-      this->FileName = FileName;
-      SetCloseExec(iFd,true);
-   }   
+      return _error->Errno("open","Could not open file %s",FileName.c_str());
+   
+   this->FileName = FileName;
+   SetCloseExec(iFd,true);
+   return true;

 }
                                                                        /*}}}*/
 // FileFd::~File - Closes the file                                     /*{{{*/
 }
                                                                        /*}}}*/
 // FileFd::~File - Closes the file                                     /*{{{*/


@@ -239,16 +342,40 @@ FileFd::~FileFd()
                                                                        /*}}}*/
 // FileFd::Read - Read a bit of the file                               /*{{{*/
 // ---------------------------------------------------------------------
                                                                        /*}}}*/
 // FileFd::Read - Read a bit of the file                               /*{{{*/
 // ---------------------------------------------------------------------

-/* */
-bool FileFd::Read(void *To,unsigned long Size)
+/* We are carefull to handle interruption by a signal while reading 
+   gracefully. */
+bool FileFd::Read(void *To,unsigned long Size,bool AllowEof)

 {
 {

-   if (read(iFd,To,Size) != (signed)Size)
+   int Res;
+   errno = 0;
+   do

    {
    {

-      Flags |= Fail;
-      return _error->Errno("read","Read error");
-   }   
+      Res = read(iFd,To,Size);
+      if (Res < 0 && errno == EINTR)
+        continue;
+      if (Res < 0)
+      {
+        Flags |= Fail;
+        return _error->Errno("read","Read error");
+      }

       
       

-   return true;
+      To = (char *)To + Res;
+      Size -= Res;
+   }
+   while (Res > 0 && Size > 0);
+   
+   if (Size == 0)
+      return true;
+   
+   // Eof handling
+   if (AllowEof == true)
+   {
+      Flags |= HitEof;
+      return true;
+   }
+   
+   Flags |= Fail;
+   return _error->Error("read, still have %u to read but none left",Size);

 }
                                                                        /*}}}*/
 // FileFd::Write - Write to the file                                   /*{{{*/
 }
                                                                        /*}}}*/
 // FileFd::Write - Write to the file                                   /*{{{*/


@@ -256,13 +383,29 @@ bool FileFd::Read(void *To,unsigned long Size)
 /* */
 bool FileFd::Write(const void *From,unsigned long Size)
 {
 /* */
 bool FileFd::Write(const void *From,unsigned long Size)
 {

-   if (write(iFd,From,Size) != (signed)Size)
+   int Res;
+   errno = 0;
+   do

    {
    {

-      Flags |= Fail;
-      return _error->Errno("write","Write error");
+      Res = write(iFd,From,Size);
+      if (Res < 0 && errno == EINTR)
+        continue;
+      if (Res < 0)
+      {
+        Flags |= Fail;
+        return _error->Errno("write","Write error");
+      }
+      
+      From = (char *)From + Res;
+      Size -= Res;

    }
    }

+   while (Res > 0 && Size > 0);

    
    

-   return true;
+   if (Size == 0)
+      return true;
+   
+   Flags |= Fail;
+   return _error->Error("write, still have %u to write but couldn't",Size);

 }
                                                                        /*}}}*/
 // FileFd::Seek - Seek in the file                                     /*{{{*/
 }
                                                                        /*}}}*/
 // FileFd::Seek - Seek in the file                                     /*{{{*/


@@ -276,6 +419,20 @@ bool FileFd::Seek(unsigned long To)
       return _error->Error("Unable to seek to %u",To);
    }
    
       return _error->Error("Unable to seek to %u",To);
    }
    

+   return true;
+}
+                                                                       /*}}}*/
+// FileFd::Skip - Seek in the file                                     /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool FileFd::Skip(unsigned long Over)
+{
+   if (lseek(iFd,Over,SEEK_CUR) < 0)
+   {
+      Flags |= Fail;
+      return _error->Error("Unable to seek ahead %u",Over);
+   }
+   

    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/