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scripts: support GNU make 4.4 in jobserver-exec 

Starting with GNU make 4.4, --jobserver-auth newly uses named
pipe (fifo) instead of part of opened file descriptors:
https://www.gnu.org/software/make/manual/html_node/POSIX-Jobserver.html

Support also the new format.

Signed-off-by: Martin Liska <mliska@suse.cz>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Martin Liska 2023-01-16 11:45:33 +01:00 committed by Masahiro Yamada
parent aedee9e8d9
commit 8c0089882a
1 changed files with 14 additions and 5 deletions
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19
scripts/jobserver-exec
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@ -26,11 +26,20 @@ try:
# If the MAKEFLAGS variable contains multiple instances of the
# --jobserver-auth= option, the last one is relevant.
fds = opts[-1].split("=", 1)[1]
reader, writer = [int(x) for x in fds.split(",", 1)]
# Open a private copy of reader to avoid setting nonblocking
# on an unexpecting process with the same reader fd.
reader = os.open("/proc/self/fd/%d" % (reader),
os.O_RDONLY | os.O_NONBLOCK)
# Starting with GNU Make 4.4, named pipes are used for reader and writer.
# Example argument: --jobserver-auth=fifo:/tmp/GMfifo8134
_, _, path = fds.partition('fifo:')
if path:
reader = os.open(path, os.O_RDONLY | os.O_NONBLOCK)
writer = os.open(path, os.O_WRONLY)
else:
reader, writer = [int(x) for x in fds.split(",", 1)]
# Open a private copy of reader to avoid setting nonblocking
# on an unexpecting process with the same reader fd.
reader = os.open("/proc/self/fd/%d" % (reader),
os.O_RDONLY | os.O_NONBLOCK)
# Read out as many jobserver slots as possible.
while True: