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mdbx-windows: refine WSL1 detection.

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Try to fix https://github.com/snej/nimdbx/issues/1

Change-Id: Iec1c77c82ced8095e3f4e03a27a58e0bba3df76b
This commit is contained in:
Leonid Yuriev 2020-11-18 22:38:26 +03:00
parent 87161f5920
commit 862cfb9a3b
3 changed files with 23 additions and 12 deletions
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1
.github/actions/spelling/expect.txt vendored
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@ -1516,6 +1516,7 @@ stepbystep
storz
stoull
strcasecmp
strcasestr
strcat
strchr
strcmp

31
src/lck-posix.c
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@ -26,13 +26,17 @@
#ifndef MDBX_ALLOY
uint32_t mdbx_linux_kernel_version;
bool mdbx_RunningOnWSL;
bool mdbx_RunningOnWSL1;
#endif /* MDBX_ALLOY */
static __cold bool probe_for_WSL(const char *tag) {
/* "Official" way of detecting WSL but not WSL2
* https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364 */
return strstr(tag, "Microsoft") || strstr(tag, "WSL");
static __cold uint8_t probe_for_WSL(const char *tag) {
const char *const WSL = strstr(tag, "WSL");
if (WSL && WSL[3] >= '2' && WSL[3] <= '9')
return WSL[3] - '0';
const char *const wsl = strstr(tag, "wsl");
if (wsl && wsl[3] >= '2' && wsl[3] <= '9')
return wsl[3] - '0';
return (WSL || wsl || strcasestr(tag, "Microsoft")) ? 1 : 0;
}
#endif /* Linux */
@ -42,9 +46,16 @@ mdbx_global_constructor(void) {
#if defined(__linux__) || defined(__gnu_linux__)
struct utsname buffer;
if (uname(&buffer) == 0) {
mdbx_RunningOnWSL = probe_for_WSL(buffer.version) ||
probe_for_WSL(buffer.sysname) ||
probe_for_WSL(buffer.release);
/* "Official" way of detecting WSL1 but not WSL2
* https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364
*
* WARNING: False negative detection of WSL1 will result in DATA LOSS!
* So, the REQUIREMENTS for this code:
* 1. MUST detect WSL1 without false-negatives.
* 2. DESIRABLE detect WSL2 but without the risk of violating the first. */
mdbx_RunningOnWSL1 = probe_for_WSL(buffer.version) == 1 ||
probe_for_WSL(buffer.sysname) == 1 ||
probe_for_WSL(buffer.release) == 1;
int i = 0;
char *p = buffer.release;
while (*p && i < 4) {
@ -314,10 +325,10 @@ MDBX_INTERNAL_FUNC int __cold mdbx_lck_seize(MDBX_env *env) {
int rc = MDBX_SUCCESS;
#if defined(__linux__) || defined(__gnu_linux__)
if (unlikely(mdbx_RunningOnWSL)) {
if (unlikely(mdbx_RunningOnWSL1)) {
rc = ENOLCK /* No record locks available */;
mdbx_error("%s, err %u",
"WSL (Windows Subsystem for Linux) is mad and trouble-full, "
"WSL1 (Windows Subsystem for Linux) is mad and trouble-full, "
"injecting failure to avoid data loss",
rc);
return rc;

3
src/osal.h
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@ -583,8 +583,7 @@ MDBX_INTERNAL_FUNC int mdbx_vasprintf(char **strp, const char *fmt, va_list ap);
#if defined(__linux__) || defined(__gnu_linux__)
MDBX_INTERNAL_VAR uint32_t mdbx_linux_kernel_version;
MDBX_INTERNAL_VAR bool
mdbx_RunningOnWSL /* Windows Subsystem for Linux is mad and trouble-full */;
MDBX_INTERNAL_VAR bool mdbx_RunningOnWSL1 /* Windows Subsystem 1 for Linux */;
#endif /* Linux */
#ifndef mdbx_strdup