busybox-w32/shell, branch fix_backslash

win32: use built-in applets for non-existent binaries with Unix-style paths

2020-08-13T13:58:01+00:00

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 executables

2020-08-13T13:58:01+00:00

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()

2020-08-13T13:58:01+00:00

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 shrink

2020-08-13T13:58:01+00:00

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.

Merge branch 'busybox' into merge

2020-07-09T12:10:58+00:00

ash: tidy code, no functional change

2020-07-09T08:29:59+00:00

ash: fix shell options

2020-07-07T16:02:58+00:00

The Windows-specific shell options winxp, noconsole and nocaseglob have had the wrong indices in optlist since the merge with upstream BusyBox in commit 517cf74f6.

ash: improve handling of UNC paths

2020-06-30T14:52:54+00:00

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.

ash: avoid duplicated slashes in output of type/command builtins

2020-06-29T10:46:43+00:00

Microsoft developers have a penchant for adding trailing slashes to entries in PATH: C:/Windows/System32/WindowsPowerShell/v1.0/ C:/Windows/System32/OpenSSH/ The 'type' and 'command -v' shell builtins return paths with duplicated slashes for executables in those directories. See GitHub issue #191. Bonus fixes: - handle backslashes as well as slashes in concat_path_file() - convert backslashes to slashes in the output of 'type', 'command -v'

nologin: make it possible to build it as single applet

2020-06-24T13:05:22+00:00

Signed-off-by: Denys Vlasenko