diff options
| -rw-r--r-- | compat/mingw.c | 87 | ||||
| -rwxr-xr-x | t/t0610-reftable-basics.sh | 8 |
2 files changed, 88 insertions, 7 deletions
diff --git a/compat/mingw.c b/compat/mingw.c index 0d9600543c..c4320769db 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -2217,10 +2217,16 @@ int mingw_accept(int sockfd1, struct sockaddr *sa, socklen_t *sz) #undef rename int mingw_rename(const char *pold, const char *pnew) { + static int supports_file_rename_info_ex = 1; DWORD attrs, gle; int tries = 0; wchar_t wpold[MAX_PATH], wpnew[MAX_PATH]; - if (xutftowcs_path(wpold, pold) < 0 || xutftowcs_path(wpnew, pnew) < 0) + int wpnew_len; + + if (xutftowcs_path(wpold, pold) < 0) + return -1; + wpnew_len = xutftowcs_path(wpnew, pnew); + if (wpnew_len < 0) return -1; /* @@ -2231,11 +2237,84 @@ int mingw_rename(const char *pold, const char *pnew) return 0; if (errno != EEXIST) return -1; + repeat: - if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING)) - return 0; + if (supports_file_rename_info_ex) { + /* + * Our minimum required Windows version is still set to Windows + * Vista. We thus have to declare required infrastructure for + * FileRenameInfoEx ourselves until we bump _WIN32_WINNT to + * 0x0A00. Furthermore, we have to handle cases where the + * FileRenameInfoEx call isn't supported yet. + */ +#define FILE_RENAME_FLAG_REPLACE_IF_EXISTS 0x00000001 +#define FILE_RENAME_FLAG_POSIX_SEMANTICS 0x00000002 + FILE_INFO_BY_HANDLE_CLASS FileRenameInfoEx = 22; + struct { + /* + * This is usually an unnamed union, but that is not + * part of ISO C99. We thus inline the field, as we + * really only care for the Flags field anyway. + */ + DWORD Flags; + HANDLE RootDirectory; + DWORD FileNameLength; + /* + * The actual structure is defined with a single-character + * flex array so that the structure has to be allocated on + * the heap. As we declare this structure ourselves though + * we can avoid the allocation and define FileName to have + * MAX_PATH bytes. + */ + WCHAR FileName[MAX_PATH]; + } rename_info = { 0 }; + HANDLE old_handle = INVALID_HANDLE_VALUE; + BOOL success; + + old_handle = CreateFileW(wpold, DELETE, + FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE, + NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); + if (old_handle == INVALID_HANDLE_VALUE) { + errno = err_win_to_posix(GetLastError()); + return -1; + } + + rename_info.Flags = FILE_RENAME_FLAG_REPLACE_IF_EXISTS | + FILE_RENAME_FLAG_POSIX_SEMANTICS; + rename_info.FileNameLength = wpnew_len * sizeof(WCHAR); + memcpy(rename_info.FileName, wpnew, wpnew_len * sizeof(WCHAR)); + + success = SetFileInformationByHandle(old_handle, FileRenameInfoEx, + &rename_info, sizeof(rename_info)); + gle = GetLastError(); + CloseHandle(old_handle); + if (success) + return 0; + + /* + * When we see ERROR_INVALID_PARAMETER we can assume that the + * current system doesn't support FileRenameInfoEx. Keep us + * from using it in future calls and retry. + */ + if (gle == ERROR_INVALID_PARAMETER) { + supports_file_rename_info_ex = 0; + goto repeat; + } + + /* + * In theory, we shouldn't get ERROR_ACCESS_DENIED because we + * always open files with FILE_SHARE_DELETE But in practice we + * cannot assume that Git is the only one accessing files, and + * other applications may not set FILE_SHARE_DELETE. So we have + * to retry. + */ + } else { + if (MoveFileExW(wpold, wpnew, MOVEFILE_REPLACE_EXISTING)) + return 0; + gle = GetLastError(); + } + /* TODO: translate more errors */ - gle = GetLastError(); if (gle == ERROR_ACCESS_DENIED && (attrs = GetFileAttributesW(wpnew)) != INVALID_FILE_ATTRIBUTES) { if (attrs & FILE_ATTRIBUTE_DIRECTORY) { diff --git a/t/t0610-reftable-basics.sh b/t/t0610-reftable-basics.sh index babec7993e..eaf6fab6d2 100755 --- a/t/t0610-reftable-basics.sh +++ b/t/t0610-reftable-basics.sh @@ -450,10 +450,12 @@ test_expect_success 'ref transaction: retry acquiring tables.list lock' ' ) ' -# This test fails most of the time on Windows systems. The root cause is +# This test fails most of the time on Cygwin systems. The root cause is # that Windows does not allow us to rename the "tables.list.lock" file into -# place when "tables.list" is open for reading by a concurrent process. -test_expect_success !WINDOWS 'ref transaction: many concurrent writers' ' +# place when "tables.list" is open for reading by a concurrent process. We have +# worked around that in our MinGW-based rename emulation, but the Cygwin +# emulation seems to be insufficient. +test_expect_success !CYGWIN 'ref transaction: many concurrent writers' ' test_when_finished "rm -rf repo" && git init repo && ( |