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* win32: use built-in applets for non-existent binaries with Unix-style pathsRon Yorston2020-08-131-0/+13
| | | | | | | | | | | | | | | | | | | | Shell scripts moved from Unix may contain hard-coded paths to binaries such as /bin/sh. A recent commit made it possible to execute such binaries reliably, but that does require them to be installed. As an alternative solution: if a binary with a standard Unix path prefix can't be found but is available as a built-in applet, run the applet. Add the function unix_path() to detect paths starting with /bin, /usr/bin, /sbin or /usr/sbin. Use this function in: - the 'which' applet - shellexec(), describe_command() and find_command() in ash - mingw_spawn_1() See GitHub issue #195.
* win32: handle Unix-style absolute paths for executablesRon Yorston2020-08-131-0/+15
| | | | | | | | | | | | | | | | | | | | | | As noted in commit 548ec7045 (win32: interpret absolute paths as relative to %SYSTEMDRIVE%) a path starting with a '/' in the Unix world is treated as relative to the current drive by Windows. To avoid ambiguity that commit considered certain such paths to be relative to %SYSTEMDRIVE%. Extend this to paths representing executables. Add the functions need_system_drive() and auto_add_system_drive() to detect the need for a system drive prefix and to add it if necessary. Use these functions in: - the 'which' applet - the find_executable() function - tab-completion code - PATH look-up, shellexec(), describe_command() and find_command() in ash - parse_interpreter() and mingw_spawn_1() With these changes executable paths starting with a slash are handled consistently, whatever the current drive.
* win32: use a static buffer in get_system_drive()Ron Yorston2020-08-131-14/+13
| | | | | | | Allocate static storage for the system drive string instead of making a new allocation on every call. This is easier to manage. Adds 16 bytes.
* win32: code shrinkRon Yorston2020-08-131-0/+8
| | | | | | | | | | Add a new function, has_path(), to detect that an executable name doesn't require a path look-up. Also, since is_absolute_path() is now only used in shell/ash.c move its definition there from include/mingw.h. Saves 128 bytes.
* win32: return raw file attributes in struct mingw_statRon Yorston2020-07-091-0/+4
| | | | | | Until now the emulated stat(2) system calls have only returned a synthesised Unix-style mode value. Also return the raw Windows file attributes.
* ash: improve handling of UNC pathsRon Yorston2020-06-301-1/+2
| | | | | | | | | | | | | | Be more strict about identifying UNC paths in unc_root_len(). In updatepwd() in ash: - Skip duplicate leading slashes unless the directory is a UNC path. - Rewrite detection and handling of the five possible types of path. This improves cases like 'cd ///' and 'cd /xyz' when the current directory is a UNC path. See GitHub issue #192.
* win32: enable globbing by defaultRon Yorston2020-06-141-1/+17
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Change how busybox.exe expands wildcards on the command line. When globbing is enabled at compile time provide an implementation of _setargv(), which is run early during startup of C programs. This: - enables globbing by setting _dowildcard to -1 - checks for the presence of the environment BB_GLOBBING - if it exists and is set to 0 disables globbing - if it doesn't exist sets BB_GLOBBING=0 but continues to apply Windows' globbing in the current process The consequences of this are: - When busybox.exe is initially run from a Command Prompt Windows' globbing is applied; - Windows' globbing is turned off for future child processes, thus allowing the shell re-execute busybox.exe without it interfering with wildcards; - this behaviour can be overridden by setting BB_GLOBBING explicitly. Globbing can still be disabled at compile time if required. In that case BB_GLOBBING has no effect. With these changes globbing can be enabled by default and BusyBox will do the right thing in most circumstances. (See GitHub issues #172 and #189.)
* win32: use lazy loading for certain DLLsRon Yorston2020-06-021-6/+21
| | | | | | | | | Only a handful of functions are used from shell32.dll, userenv.dll and psapi.dll. Mostly these functions are in out of the way places. By loading the functions only when required we can avoid the startup cost of linking the three DLLs in the common case that they aren't needed.
* dd: fix handling of 'conv=notrunc seek=N'Ron Yorston2020-05-201-3/+3
| | | | | | | | | | | | | | | | | | Commit e6680912a (dd: create a sparse file when seek=N is used) broke the use of 'conv=notrunc seek=N' to modify existing files. Rename seek_sparse() to make_sparse() and: - add an argument to specify the start of the sparse region; - call make_sparse() before ftruncate(); - call make_sparse() only if: * we can determine the size of the file; * the file is not open in append mode; * the file is being extended. This should fix GitHub issue #186.
* dd: create a sparse file when seek=N is usedRon Yorston2020-03-241-0/+17
| | | | | | | When the seek=N argument is used mark the file as sparse and set the range that is sparse. See https://stackoverflow.com/questions/4011508/how-to-create-a-sparse-file-on-ntfs
* win32: stat(2): return correct st_blocks for compressed/sparse filesRon Yorston2020-03-241-1/+13
| | | | | | Use GetCompressedFileSize to obtain the actual number of blocks for compressed or sparse files. Use this to return a more accurate value for st_blocks.
* win32: tidy up detection of device filesRon Yorston2020-02-161-9/+3
| | | | | | | Define NOT_DEVICE as -1 so the return value of index_in_strings() when no device name is matched is NOT_DEVICE. Make the logic in mingw_open() clearer.
* win32: rework device file detectionRon Yorston2020-02-151-6/+4
| | | | | | Improve get_dev_type() and use it to dectect /dev/null in mingw_xopen(). Saves 64 bytes.
* win32: code shrinkRon Yorston2020-02-131-11/+9
| | | | | Have bs_to_slash() return a pointer to its argument. This allows some calls to be chained, saving 32 bytes.
* date: code shrinkRon Yorston2020-02-111-6/+0
| | | | | | | Since we don't have a working clock_settime(2) there's no point in claiming to support the '-s' option. Saves 96 bytes
* mingw: fix off-by-one error in mingw_strftime()Ron Yorston2020-01-191-1/+1
| | | | | | | | | | | | When a format specification is replaced the loop variable 't' should point to the last character of the replacement string in the new format buffer. In an extreme case if the original format string is "%z" and tm->tm_isdst is negative to indicate that no DST information is available the replacement string will be empty and 't' will point to the location before the start of the new format buffer. This is OK.
* mingw: fix use after free in file_owner()Ron Yorston2020-01-191-9/+6
| | | | | The security descriptor was being freed before its contents were accessed.
* Build fixesFRP-3329-gcf0fa4d13Ron Yorston2020-01-081-1/+1
| | | | | | - Update configuration files - Omit unnecessary libraries - Replace fake stime(2) with fake clock_settime(2)
* win32: allow nanosecond precision in file timesRon Yorston2019-08-161-12/+29
| | | | | | Modern Linux kernels use struct timespec to represent file times, thus allowing nanosecond precision. Update the WIN32 emulation of struct stat and stat(2) to do the same.
* win32: try to make working directory names consistentRon Yorston2019-04-021-1/+26
| | | | | | | | | | | | | | | Standardise the path names used for the current working directory by: - resolving with realpath(3); - making the drive name or host name uppercase. The first only really works for physical drives; results for mapped drives are patchy. The standardisation is applied in two places: - at the end of updatepwd() in ash; - when a symbolic link is resolved in mingw_chdir().
* win32: track current directory of mapped drivesRon Yorston2019-04-011-4/+7
| | | | | | | | | | | Drives mapped to a network share or path didn't have their current directory tracked when using path names of the form 'c:path'. This was because commit 585d17d26 used realpath(3) to canonicalise paths in chdir(2). Use readlink(2) instead so that mapped drives aren't canonicalised but symlinks are resolved. See GitHub issue #147.
* win32: improved support for c:path path namesRon Yorston2019-03-301-0/+12
| | | | | | | | | | | | | | | | | | | | | | | | Microsoft Windows permits path names of the form 'c:path', without a path separator after the colon. The system records a current directory for each drive and the path is interpreted relative to that. Since Windows API calls understand 'c:path' path names many commands in busybox-w32 already work with them. This commit adds the following: - The 'cd' shell built-in interprets 'c:path' path names correctly. Previously it treated them as relative to the shell's concept of the current working directory, not the current directory of the specified drive. - The 'pwd' shell built-in takes the '-a' option to list the current directory for all drives. - 'c:path' path names are subject to tab-completion. Paths of the form 'c:path' don't work for mapped network drives or paths that have been associated with a drive using SUBST. See GitHub issue #147.
* win32: interpret absolute paths as relative to %SYSTEMDRIVE%Ron Yorston2019-03-281-0/+56
| | | | | | | | | | | | | | | | | | | | | | BusyBox contains hardcoded references to absolute paths which are unique in the *nix world but on Microsoft Windows are interpreted as being on the current drive. To make these unique again consider them to be relative to %SYSTEMDRIVE%. Support this by adding functions to: - determine the system drive (not using the environment variable); - change a process's current directory to the root of the system drive; - make relative paths absolute before changing directory (if needed). The following applications have been modified: - ash references /etc/profile from the system drive; - dpkg places its data store on and installs files to the system drive; - rpm installs files to the system drive; - man looks for configuration files and man pages on the system drive. See GitHub issue #158.
* win32: share code to find root prefix of pathRon Yorston2019-03-231-0/+35
| | | | | | | Move unc_root_len() from ash to mingw32.c and use it in the new function root_len(), which can be used in make_directory(). This reduces changes to upstream code and saves a few bytes.
* win32: change stat(2) error code in certain casesRon Yorston2019-03-201-1/+0
| | | | | | | | | | | | | | | Commit 325fee1f9 (win32: change handling of trailing slashes in stat(2)) caused stat(2) to return EINVAL in some cases when ENOENT might have been more appropriate. This caused the command: rm -f dir/* to report an error when the directory was empty, contrary to its expected behaviour of saying nothing. Fixes GitHub issue #155.
* win32: add function to convert slashes to backslashesRon Yorston2019-03-151-5/+14
| | | | | | | | | There are now two places where slashes are converted to backslashes throughout a string so it makes sense to create a function to do this. To avoid confusion rename convert_slashes() to bs_to_slash() and call the new function slash_to_bs().
* win32: realpath(3): remove trailing slashRon Yorston2019-03-141-1/+4
| | | | | | | | | If the path is that of a drive mapped to a network share _fullpath() leaves the trailing slash on the drive name and it remains present after the call to resolve_symlinks(). Remove a trailing slash from the resolved path unless it's preceded by a colon.
* win32: consolidate file metadata optionsRon Yorston2019-03-121-8/+2
| | | | Merge FEATURE_IDENTIFY_OWNER into FEATURE_EXTRA_FILE_DATA.
* win32: changes to user idsRon Yorston2019-03-101-20/+30
| | | | | | | | | | | | | | | | Formalise the use of 0 as the uid of a process running with elevated privileges: - Rewrite getuid(2) to return DEFAULT_UID by default and 0 if the process has elevated privileges. - geteuid(2) and the corresponding functions for groups are aliases for getuid(2). - Change root's home directory to be whatever GetSystemDirectory() returns, probably C:/Windows/System32 in most cases. - Remove the special handling of geteuid(2) in the line editing code. With these changes the shell started by 'su' is a lot more like a *nix root shell.
* win32: add a function to detect running with elevated privilegesRon Yorston2019-03-091-0/+18
| | | | | Add is_admin() and use it to alter the command prompt in the line editor when running with admin privileges.
* win32: extend normalisation of paths in realpath(3)Ron Yorston2019-03-081-2/+20
| | | | | | | | | | | The code to normalise paths in resolve_symlinks(), which is used by realpath(3), was incomplete and unable to handle UNC paths. Make an ASCII version of normalize_ntpath() to extend the cases covered. This fixes a regression introduced by commit 585d17d26 (win32: canonicalize path in chdir(2)): it wasn't possible to change to a directory with a UNC path.
* win32: canonicalize path in chdir(2)Ron Yorston2019-03-061-0/+13
| | | | | | | | | | | | Provide an implementation of chdir(2) which canonicalizes the path to resolve symlinks. Otherwise changing to a symlinked directory confuses 'ls -l' because it thinks '.' is a link rather than a directory. OTOH, using 'cd' in the shell to change to a symlinked directory now results in a mismatch between the shell's idea of where we are and what's displayed in the prompt. But upstream BusyBox does that too so it must be OK.
* win32: implement readlink(2)Ron Yorston2019-03-061-0/+65
| | | | | | | | | | Provide an implementation of readlink(2) based on code from Git for Windows. This version only supports symbolic links, not mount points, as the latter seem to work well enough as-is. With this change the ls and stat applets can display the targets of symbolic links. The readlink applet has been enabled in the default configuration.
* win32: let realpath(3) succeed on WinXP/ReactOSRon Yorston2019-03-061-8/+14
| | | | | | Allow realpath(3) to return successfully on platforms that don't support GetFinalPathNameByHandleA(). It may still have done some useful work.
* win32: drop argument from err_win_to_posix()Ron Yorston2019-03-061-5/+5
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* win32: improved results for symlinks from stat(2)Ron Yorston2019-03-051-36/+56
| | | | | | | | The file size and times reported when Windows follows a symlink are incorrect. To get the correct values canonicalize the path and try again. Also fetch the correct device id and inode for symlinks.
* win32: change handling of trailing slashes in stat(2)Ron Yorston2019-03-041-40/+11
| | | | | | | | | | The code to implement stat(2) works around the fact that getting the attributes of a file fails if its name ends with a path separator. Directory names with a trailing path separator work fine. Why bother with this workaround? Linux doesn't. Instead try to return a meaningful error code.
* win32: simplify utimes(2) implementationRon Yorston2019-03-041-31/+6
| | | | | | | | | | | SetFileTime only needs FILE_WRITE_ATTRIBUTES access, not full read/write access. Therefore it isn't necessary to change the permissions of read-only files. The flag FILE_FLAG_BACKUP_SEMANTICS is required to access directories but does no harm if used on a file. As a result there's no need to get file attributes.
* win32: let stat(2) report numeric uids for local usersRon Yorston2019-03-021-8/+47
| | | | | | | | | | | Further extend file identification so stat(2) returns the relative identifier as a numeric uid for files with owner SIDs that look like a local or domain user. See: https://blogs.technet.microsoft.com/markrussinovich/2009/11/03/the-machine-sid-duplication-myth-and-why-sysprep-matters/ https://cygwin.com/cygwin-ug-net/ntsec.html
* win32: make stat(2) try to identify the owner of filesRon Yorston2019-03-011-7/+64
| | | | | Extend stat(2) so it tries to determine whether a file belongs to the current user or not. If not it's said to belong to root.
* win32: make more use of common lazy loading codeRon Yorston2019-02-271-10/+5
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* win32: fake permissions/ownership for inaccessible filesRon Yorston2019-02-251-0/+5
| | | | | If stat(2) knows a file exists but can't obtain additional metadata for it give it root ownership and no permissions for other.
* win32: stat(2) succeeds if fetching extra metadata failsRon Yorston2019-02-191-11/+3
| | | | | | | | | Some files can't be opened to fetch additional metadata. When that happens allow stat(2) to successfully return what data it has. In a few cases where the inode number is used to determine if files are identical ignore invalid inode numbers.
* win32: tidy up stat(2) implementationRon Yorston2019-02-181-21/+22
| | | | | | | Since st_nlink now depends on st_mode it should be set after st_mode is initialised. Rearrange the code to fetch extra metadata.
* win32: avoid use of uninitialised metadata in stat(2)Ron Yorston2019-02-181-2/+8
| | | | | | When additional metadata was being fetched the code for non-disk files used uninitialised data from the BY_HANDLE_FILE_INFORMATION structure.
* ash: updated support for hiding consoleRon Yorston2019-02-171-0/+16
| | | | | | | | Move the code to hide the console to a separate function in win32/mingw.c. Use lazy loading to avoid problems on platforms where the require APIs aren't supported (PR #70). Enable console hiding in the default 64-bit configuration.
* win32: make stat(2) fetch additional metadataRon Yorston2019-02-161-4/+35
| | | | | | | | | | | | | | | Modify the WIN32 implementation of stat(2) to fetch inode number, device id and number of hardlinks. This requires opening a handle to the target file so it will be slower. A number of features can be enabled or start to work: - tar can detect if an archive is being stored in itself; - find can support the -inum and -links options; - ls can display inode numbers; - diff can detect attempts to compare a file with itself; - du has better support for hardlinked files; - cp can detect attempts to copy a file over itself.
* win32: add a function to remove CRs from a text bufferRon Yorston2019-02-141-0/+11
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* win32: add a fake root user and groupRon Yorston2019-01-081-13/+26
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* win32: implement umask(2)Ron Yorston2019-01-071-0/+14
| | | | | | | | | umask() in the Microsoft C runtime takes different arguments to umask(2). Implement a fake umask(2) that remembers the mask and calls the Microsoft umask() with an appropriate value. Since the mask won't be inherited by children use an environment variable to pass any value set by the shell built-in umask.
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