mk: provide a mechanism to default to `rc` For cross-compiling plan9 from Unix, provide a way to force `mk` to use `rc` instead of `sh` without setting `MKSHELL` in individual `mkfile`s. If the environment variable `FORCERCFORMK` is set, `mk` will default to using `rc`, not `sh`. Signed-off-by: Dan Cross <cross@gajendra.net>

sam: fix spurious overwrite message Fixes: % sam -d -. w foo foo: (new file) #0 w foo ?warning: write might change good version of `foo'

acme: fix extra print args

lib9p: Fix compile error commit 385a6d5877258cee0cac6151e6359c9206006b01 removed src/lib9p/_post.c from the code base, but overlooked removing a reference to the _post.o object file from the src/lib9p/mkfile. This results in lib9p failing to compile: * Running on Darwin... * Compiler version: Apple clang version 12.0.5 (clang-1205.0.22.11) * Building mk... * Building everything (be patient)... >>> mk: don't know how to make '/Users/sasha/plan9port_fork/lib/lib9p.a(_post.o)' in /Users/sasha/plan9port_fork/src/lib9p mk: for i in ... : exit status=exit(1) Remove _post.o from the list of dependent object files from src/lib9p/mkfile to have lib9p compile. Fixes: 385a6d587725 ("lib9p: Remove postmountsrv (#505)")

lib9p: Remove postmountsrv (#505)

.gitignore: Ignore some more things that get created during compile.

9term: Skip unnecessary ioctl call on AIX.

libdraw: Fix GUI programs on AIX (#398)

bin/9c, bin/9l: Re-enable optimization on AIX.

libthread: use setpgid instead of setpgrp

install(1): mention libfontconfig1-dev for Debian Also update install.txt, which mistakenly contained intro(1). Pointed out by Nicholas Schwartz.

fspread: fix buffer overflow Without this fix, fspread is trusting the server to return as much data as requested, or less. If a server responds with more data though, fspread writes beyond the bounds of the buffer to fill, which is passed in by the caller. It depends on the caller of fspread() where that buffer is, so there are various possible attack vectors. In the Plan9 kernel, I found this implemented in devmnt.c, where overly large responses are truncated to the size requested before copying, so I assume that this strategy works here too. This also affects fsread() and fsreadn(), which are based on fspread().

all: update for new MIT license On March 23, 2021, Nokia transferred the copyrights in the Plan 9 software to the Plan 9 Foundation, which relicensed them under the MIT license. This commit updates the Plan 9 from User Space license to reflect the new base license. The vast majority of the contributions beyond the base Plan 9 set were by me, many of them explicitly under an MIT license. Those are all under the new MIT license now as well. The port of mk to Unix was taken from Inferno via Vita Nuova and had been made available under GPL, but Vita Nuova has relicensed Inferno under the MIT license as well, to match the new Plan 9 license. Michael Teichgraber contributed src/lib9/zoneinfo.c explicitly under the Lucent Public License but has agreed to change the contribution to the MIT license now used in the rest of the distribution. There remain a few exceptions, most notably fonts. See the root LICENSE file for full details. The only mention of the Lucent Public License in the whole tree now is in the LICENSE file, explaining the history.

mk: fix for Unix build

acme: fix double-free in acmeerrorproc The receiver of cerr takes ownership of s.