Hello, I'm sorry for the delay due to my vacation. Here are details from GH CI. Jiri Run .\.github\scripts\debug_environment.ps1 .\.github\scripts\debug_environment.ps1 shell: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.EXE -command ". '{0}'" env: SCOOP: C:\Users\runneradmin\scoop =================== OS & SYSTEM INFO =================== Caption : Microsoft Windows Server 2025 Datacenter Version : 10.0.26100 BuildNumber : 26100 OSArchitecture : 64-bit SystemDirectory : C:\Windows\system32 LastBootUpTime : 9/13/2026 5:27:39 PM PSVersion : 5.1.26100.33296 PSEdition : Desktop CLRVersion : 4.0.30319.42000 ProcessorArch : AMD64 AnsiCodePage : 1252 LongPathsEnabled : 1 ProbedVolumes : D:\a\scoop-bucket\scoop-bucket, C:\Users\runneradmin\scoop =================== FILESYSTEM INFO =================== --- volume D: (probe root: D:\a\scoop-bucket\scoop-bucket) --- DriveLetter : D FileSystemLabel : Temporary Storage FileSystem : NTFS FileSystemType : NTFS DriveType : Fixed AllocationUnitSize : 4096 Size : 161059172352 SizeRemaining : 157865340928 DeviceID : D: VolumeName : Temporary Storage FileSystem : NTFS MaximumComponentLength : 255 SupportsFileBasedCompression : True VolumeSerialNumber : 922614C0 GetVolumeInformationW: label=Temporary Storage fs=NTFS serial=922614C0 maxComponentLength=255 flags=0x03E72EFF flags set: FILE_CASE_PRESERVED_NAMES, FILE_UNICODE_ON_DISK, FILE_FILE_COMPRESSION, FILE_VOLUME_IS_COMPRESSED, , , , , , , , --- volume C: (probe root: C:\Users\runneradmin\scoop) --- DriveLetter : C FileSystemLabel : Windows FileSystem : NTFS FileSystemType : NTFS DriveType : Fixed AllocationUnitSize : 4096 Size : 160467759104 SizeRemaining : 33966383104 DeviceID : C: VolumeName : Windows FileSystem : NTFS MaximumComponentLength : 255 SupportsFileBasedCompression : True VolumeSerialNumber : D6F2A281 GetVolumeInformationW: label=Windows fs=NTFS serial=D6F2A281 maxComponentLength=255 flags=0x03E72EFF flags set: FILE_CASE_PRESERVED_NAMES, FILE_UNICODE_ON_DISK, FILE_FILE_COMPRESSION, FILE_VOLUME_IS_COMPRESSED, , , , , , , , =================== C RUNTIME fopen() TRAILING-SEPARATOR TEST =================== --- volume D:, probe directory D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78 --- ucrtbase fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\marker_ucrtbase_fwdslash/", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk ucrtbase fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\marker_ucrtbase_backslash\", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk ucrtbase fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\marker_ucrtbase_plain", "wb") -> OPENED -> created: marker_ucrtbase_plain [FILE, 0 bytes] attributes=Archive msvcrt fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\marker_msvcrt_fwdslash/", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk msvcrt fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\marker_msvcrt_backslash\", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk msvcrt fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\marker_msvcrt_plain", "wb") -> OPENED -> created: marker_msvcrt_plain [FILE, 0 bytes] attributes=Archive --- volume C:, probe directory C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af --- ucrtbase fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\marker_ucrtbase_fwdslash/", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk ucrtbase fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\marker_ucrtbase_backslash\", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk ucrtbase fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\marker_ucrtbase_plain", "wb") -> OPENED -> created: marker_ucrtbase_plain [FILE, 0 bytes] attributes=Archive msvcrt fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\marker_msvcrt_fwdslash/", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk msvcrt fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\marker_msvcrt_backslash\", "wb") -> FAILED errno=22 (Invalid argument) -> nothing created on disk msvcrt fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\marker_msvcrt_plain", "wb") -> OPENED -> created: marker_msvcrt_plain [FILE, 0 bytes] attributes=Archive =================== CONSEQUENCE: DOES A MARKER FILE BLOCK mkdir()? =================== fopen("D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78\web2c/", "wb") -> FAILED errno=22 (Invalid argument) 'web2c' was not created - mkdir() would not be blocked here fopen("C:\Users\runneradmin\scoop\ctx-probe-44ee47e2feb14608a2f94c23526a11af\web2c/", "wb") -> FAILED errno=22 (Invalid argument) 'web2c' was not created - mkdir() would not be blocked here =================== LUAMETATEX io.open() TRAILING-SEPARATOR TEST =================== --- C:\Users\runneradmin\scoop\apps\context\current\tex\texmf-win64\bin\luametatex.exe --luaonly (probe directory D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78) --- lua version: Lua 5.5 io.open("D:\\a\\scoop-bucket\\scoop-bucket\\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78/lua_marker_fwdslash/", 'wb') -> nil err=D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78/lua_marker_fwdslash/: Invalid argument errno=22 io.open("D:\\a\\scoop-bucket\\scoop-bucket\\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78/lua_marker_backslash\\", 'wb') -> nil err=D:\a\scoop-bucket\scoop-bucket\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78/lua_marker_backslash\: Invalid argument errno=22 io.open("D:\\a\\scoop-bucket\\scoop-bucket\\ctx-probe-b967d7f6d6fb4084b0c7a5ecfbafdf78/lua_marker_plain", 'wb') -> file (00007ff90cddda90) err=nil errno=nil lua_marker_fwdslash -> nothing created on disk lua_marker_backslash -> nothing created on disk lua_marker_plain -> created: [FILE, 0 bytes] attributes=Archive =================== SUMMARY =================== Volume Probe Opened Created ------ ----- ------ ------- D: ucrtbase fopen(...'/') False False D: msvcrt fopen(...'/') False False C: ucrtbase fopen(...'/') False False C: msvcrt fopen(...'/') False False Reading: "Opened=True, Created=True" means this Windows CRT accepts a path ending in "/" for writing and materialises a literal 0-byte file under the separator-stripped name - the behaviour util-zip.lua's unzipdir() relies on NOT happening (on POSIX the same open fails, making the write a no-op). On Fri, Sep 4, 2026 at 2:25 PM Hans Hagen via ntg-context < ntg-context@ntg.nl> wrote:

On 9/4/2026 10:25 AM, Jiri Bělka wrote:

...

Fix util-zip.lua's unzipdir() writing zip directory-marker entries as 0-byte files, which then blocks mkdir() for the real files that belong underneath them (reproducible on Windows; the same code path happens to no-op harmlessly on POSIX, where opening a path ending in "/" for writing simply fails).

Upstream: ConTeXt LMTX, tex/context/base/mkiv/util-zip.lua, function unzipdir - bundled (minified, concatenated with other core modules) into bin/mtxrun.lua inside the small bootstrap archive (context-<platform>.zip) that ships from lmtx.pragma-ade.com . This patch targets that bundled bin/mtxrun.lua copy, applied with `git apply -p1` from the app's install directory before the first `mtx-install.lua --update` bootstrap run.

How this was found ------------------- The jirib/scoop-bucket "context" package's own Windows CI (GitHub Actions, windows-latest) failed a fresh `scoop install context` with mtxrun unable to find tex/texmf-context/web2c/contextcnf.lua, and every mtxrun/context script lookup afterwards failing with "unknown script ...". A diagnostic step added to that CI listed the tree after bootstrap: tex/texmf-context had only ~10 entries, and every one of them - including "web2c" - was a 0-byte *file* rather than a directory (`Get-ChildItem` showed `-a----` file-mode entries where directories were expected).

To rule out a scoop-specific packaging mistake, the exact same `mtx-install.lua --update` bootstrap was reproduced by hand, fresh, directly against the real upstream context-linux-64.zip / context-win64.zip / texmf-context.zip - on Linux it succeeded on the first try (5723 real files under tex/texmf-context, web2c a real directory); the identical code, same zip, same directory-marker entries, failed only on Windows. Tracing unzipdir()/unzipfile() in the bundled bin/mtxrun.lua explained the split: unzipfile() returns "" for a directory-marker entry (0 compressed bytes), which Lua treats as truthy, so unzipdir() proceeds to mkdirs()+savedata() for it. Writing a file to a path ending in "/" apparently fails silently on POSIX (harmless no-op there) but succeeds on Windows as a literal 0-byte file with that name - which then blocks mkdir() for every real file meant to live underneath it.

This patch was applied to bin/mtxrun.lua and verified against a real, fresh `scoop install context` on a GitHub Actions windows-latest runner (jirib/scoop-bucket CI): the bootstrap now completes in ~2 minutes (previously it either corrupted the tree, or - with a detect-and-retry workaround instead of this patch - took ~48 minutes falling back to downloading ~6700 files individually), tex/texmf-context contains the correct 5723 files with web2c as a real directory, and `context --version` / `mtxrun --generate` both work.

Reported upstream to ntg-context@ntg.nl mailto:ntg-context@ntg.nl.

--- a/bin/mtxrun.lua +++ b/bin/mtxrun.lua @@ -16453,7 +16453,8 @@ for i=1,count do local l=list[i] local n=l.filename - if not validate or validate(n) then + if n:sub(-1) == "/" then + elseif not validate or validate(n) then local d=unzipfile(z,n) if d then local p=filejoin(path,n)

more like (in util-zip.lua):

if find(n,"/$") then -- mkdirs(dirname(n)) elseif not validate or validate(n) then

and then

mtxrun --selfmerge

but ... as I never saw this on windows, what file system are you using?

Hans

----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------

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