@matheusbsbs / matheus-bagliano / commits / b6852e1979

mingw: do not treat `COM0` as a reserved file name

In 4dc42c6c186 (mingw: refuse paths containing reserved names, 2019-12-21), we started disallowing file names that are reserved, e.g. `NUL`, `CONOUT$`, etc. This included `COM<n>` where `<n>` is a digit. Unfortunately, this includes `COM0` but only `COM1`, ..., `COM9` are reserved, according to the official documentation, `COM0` is mentioned in the "NT Namespaces" section but it is explicitly _omitted_ from the list of reserved names: https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file#naming-conventions Tests corroborate this: it is totally possible to write a file called `com0.c` on Windows 10, but not `com1.c`. So let's tighten the code to disallow only the reserved `COM<n>` file names, but to allow `COM0` again. This fixes https://github.com/git-for-windows/git/issues/2470. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Johannes Schindelin committed Apr 8, 2020 at 18:06 UTC b6852e19794245566f7c961a434c56ca3b7a883b
2 files changed +7 -3
compat/mingw.c
+5 -3
index 2136744af3..f2c94f9d08 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -2590,12 +2590,14 @@ not_a_reserved_name: continue; } break; - case 'c': case 'C': /* COM<N>, CON, CONIN$, CONOUT$ */ + case 'c': case 'C': + /* COM1 ... COM9, CON, CONIN$, CONOUT$ */ if ((c = path[++i]) != 'o' && c != 'O') goto not_a_reserved_name; c = path[++i]; - if (c == 'm' || c == 'M') { /* COM<N> */ - if (!isdigit(path[++i])) + if (c == 'm' || c == 'M') { /* COM1 ... COM9 */ + c = path[++i]; + if (c < '1' || c > '9') goto not_a_reserved_name; } else if (c == 'n' || c == 'N') { /* CON */ c = path[i + 1];
t/t0060-path-utils.sh
+2
index 2ea2d00c39..56db5c8aba 100755 --- a/t/t0060-path-utils.sh +++ b/t/t0060-path-utils.sh @@ -476,6 +476,7 @@ test_expect_success MINGW 'is_valid_path() on Windows' ' C:\\git \ comm \ conout.c \ + com0.c \ lptN \ \ --not \ @@ -488,6 +489,7 @@ test_expect_success MINGW 'is_valid_path() on Windows' ' "AUX.c" \ "abc/conOut\$ .xyz/test" \ lpt8 \ + com9.c \ "lpt*" \ Nul \ "PRN./abc"