On Friday, May 31, 2013 8:58:06 AM UTC+2, Jason Smith wrote:
> Hi All,
>
> Currently I am looking at a way to redirect standard output and error from
> git.
>
> What I am finding is that when I call something like "git fetch
> g...@github.com:username/project.git" there is a challenge for the ssh
> passphrase waiting on the console. When I do this via a "CreateProcess" in
> an application and try to redirect the output to another location I don't
> see the output come through the pipe I have setup. Has this been seen
> before and is there a way to fix this? Currently haven't been able to find
> something in the archive, or on google about it.
>
> The test code I am using is listed below. As a test you can make the
> command anything which returns a large amount of text and this is returned
> to the calling application. E.g. ipconfig. Note that the working directory
> needs to be change to something which exists, and already contains the
> project being fetched.
>
>
> ##### CODE ######
>
> #define _WIN32_WINNT _WIN32_WINNT_WIN7
> #include <windows.h>
> #include <stdio.h>
> #include <string>
> #include <iostream>
>
> void launch(const char * cmdline_in)
> {
> PROCESS_INFORMATION processInfo;
> STARTUPINFOA startupInfo;
> SECURITY_ATTRIBUTES saAttr;
>
> HANDLE stdoutReadHandle = NULL;
> HANDLE stdoutWriteHandle = NULL;
>
> char cmdline[256];
> char outbuf[32768];
> DWORD bytes_read;
> char tBuf[257];
>
> DWORD exitcode;
>
> strcpy_s(cmdline, sizeof(cmdline), cmdline_in);
>
> memset(&saAttr, 0, sizeof(saAttr));
> saAttr.nLength = sizeof(SECURITY_ATTRIBUTES);
> saAttr.bInheritHandle = TRUE;
> saAttr.lpSecurityDescriptor = NULL;
>
> // Create a pipe for the child process's STDOUT.
> if (!CreatePipe(&stdoutReadHandle, &stdoutWriteHandle, &saAttr, 5000))
> {
> printf("CreatePipe: %u\n", GetLastError());
> return;
> }
>
> // Ensure the read handle to the pipe for STDOUT is not inherited.
> if (!SetHandleInformation(stdoutReadHandle, HANDLE_FLAG_INHERIT, 0))
> {
> printf("SetHandleInformation: %u\n", GetLastError());
> return;
> }
>
> memset(&startupInfo, 0, sizeof(startupInfo));
> startupInfo.cb = sizeof(startupInfo);
> startupInfo.hStdError = stdoutWriteHandle;
> startupInfo.hStdOutput = stdoutWriteHandle;
> startupInfo.hStdInput = GetStdHandle(STD_INPUT_HANDLE);
> startupInfo.dwFlags |= STARTF_USESTDHANDLES;
>
> // memset(&processInfo, 0, sizeof(processInfo)); // Not actually
> necessary
>
> printf("Starting.\n");
>
> if (!CreateProcessA(NULL, cmdline, NULL, NULL, TRUE,
> CREATE_NO_WINDOW, NULL, "C:\\SourceDirectory\\", &startupInfo,
> &processInfo))
> {
> printf("Create Process Failed %u\n", GetLastError());
> return;
> }
>
> printf("Close Handle\n");
> CloseHandle(stdoutWriteHandle);
>
> strcpy_s(outbuf, sizeof(outbuf), "");
> printf("Start of Loop\n");
> for (;;) {
> printf("Just before ReadFile(...)\n");
> if (!ReadFile(stdoutReadHandle, tBuf, 256, &bytes_read, NULL))
> {
> printf("ReadFile: %u\n", GetLastError());
> break;
> }
> printf("Just after ReadFile, read %u byte(s)\n", bytes_read);
> if (bytes_read > 0)
> {
> tBuf[bytes_read] = '\0';
> strcat_s(outbuf, sizeof(outbuf), tBuf);
> }
> Sleep(1);
> }
>
> printf("Output: %s\n", outbuf);
>
> if (WaitForSingleObject(processInfo.hProcess, INFINITE) !=
> WAIT_OBJECT_0)
> {
> printf("WaitForSingleObject: %u\n", GetLastError());
> return;
> }
>
> if (!GetExitCodeProcess(processInfo.hProcess, &exitcode))
> {
> printf("GetExitCodeProcess: %u\n", GetLastError());
> return;
> }
>
> printf("Exit code: %u\n", exitcode);
>
> CloseHandle( processInfo.hProcess );
> CloseHandle( processInfo.hThread );
>
> return;
> }
>
> int main(int argc, char** argv)
> {
> launch("C:\\Program Files (x86)\\Git\\bin\\git.exe fetch
> https://github.com/username/project.git";);
> std::string line;
> std::getline(std::cin, line);
> return 0;
> }
>
>
>
I think this question would be better aimed at the Git developer mailing
list: https://gist.github.com/tfnico/4441562
Furthermore, seeing you are embedding Git inside another program, why not
use libgit2 <http://libgit2.github.com/> instead? It seems like they finally
implemented SSH support <https://github.com/libgit2/libgit2/pull/1558>.
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