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-rw-r--r--apt-pkg/contrib/fileutl.cc55
1 files changed, 53 insertions, 2 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 798636647..336f979d6 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -223,6 +223,30 @@ bool RemoveFile(char const * const Function, std::string const &FileName)/*{{{*/
is done all other calls to GetLock in any other process will fail with
-1. The return result is the fd of the file, the call should call
close at some time. */
+
+static std::string GetProcessName(int pid)
+{
+ struct HideError
+ {
+ int err;
+ HideError() : err(errno) { _error->PushToStack(); }
+ ~HideError()
+ {
+ errno = err;
+ _error->RevertToStack();
+ }
+ } hideError;
+ std::string path;
+ strprintf(path, "/proc/%d/status", pid);
+ FileFd status(path, FileFd::ReadOnly);
+ std::string line;
+ while (status.ReadLine(line))
+ {
+ if (line.substr(0, 5) == "Name:")
+ return line.substr(6);
+ }
+ return "";
+}
int GetLock(string File,bool Errors)
{
// GetLock() is used in aptitude on directories with public-write access
@@ -256,6 +280,20 @@ int GetLock(string File,bool Errors)
{
// always close to not leak resources
int Tmp = errno;
+
+ if ((errno == EACCES || errno == EAGAIN))
+ {
+ fl.l_type = F_WRLCK;
+ fl.l_whence = SEEK_SET;
+ fl.l_start = 0;
+ fl.l_len = 0;
+ fl.l_pid = -1;
+ fcntl(FD, F_GETLK, &fl);
+ }
+ else
+ {
+ fl.l_pid = -1;
+ }
close(FD);
errno = Tmp;
@@ -266,8 +304,21 @@ int GetLock(string File,bool Errors)
}
if (Errors == true)
- _error->Errno("open",_("Could not get lock %s"),File.c_str());
-
+ {
+ if (fl.l_pid != -1)
+ {
+ auto name = GetProcessName(fl.l_pid);
+ if (name.empty())
+ _error->Errno("open", _("Could not get lock %s. It is held by process %d"), File.c_str(), fl.l_pid);
+ else
+ _error->Errno("open", _("Could not get lock %s. It is held by process %d (%s)"), File.c_str(), fl.l_pid, name.c_str());
+ }
+ else
+ _error->Errno("open", _("Could not get lock %s"), File.c_str());
+
+ _error->Notice(_("Be aware that removing the lock file is not a solution and may break your system."));
+ }
+
return -1;
}