PureUNIX v0.4.0

Highlights

Writable EXT2

• Writable EXT2 filesystem
• Block bitmap allocation
• Inode allocation
• Directory insertion/removal
• mkdir(), creat(), unlink(), rename()
• Hard links (link)
• Symbolic links (symlink/readlink)
• Fast symlinks and block-backed symlinks
• Relative and absolute symlink resolution
• Symlink loop detection (ELOOP)

POSIX/VFS

• stat() / lstat() semantics
• Permission engine
• Root/non-root access checks
• Cross-filesystem EXDEV handling
• Improved errno propagation

Testing

• New comprehensive systest.elf
• 203 automated kernel, VFS, filesystem and syscall tests
• Stress testing of allocator, directory growth, large files, FAT16 and EXT2

Result:

203 tests
203 PASS
0 FAIL

PureUNIX 0.3.0 — Writable EXT2

PureUNIX 0.3.0 — Writable EXT2

This release marks PureUNIX's transition from a read-only demonstration kernel to a writable Unix-style operating system.

Highlights

EXT2

• Read/write EXT2 support
• Block bitmap allocation
• Inode allocation
• mkdir / rmdir
• creat / unlink
• rename
• Hard links
• Symbolic links
• readlink()
• lstat()
• Relative & absolute symlink resolution
• Symlink loop detection

Unix

• UID/GID process credentials
• Unix permission enforcement
• access()
• chmod/chown stubs
• Execute permission checks

Testing

• 36 regression suites
• 116 passing checks
• 0 failures

Next milestone: v0.4.0 — Processes & IPC (fork, exec, wait, pipes).

PureUNIX 0.2

Full Changelog: https://github.com/linuxkid473/PureUNIX/commits/v0.2