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scripts/jobserver-exec: parse the last --jobserver-auth= option

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In the GNU Make manual, the section "Sharing Job Slots with GNU make"
says:

    Be aware that the MAKEFLAGS variable may contain multiple instances
    of the --jobserver-auth= option. Only the last instance is relevant.

Take the last element of the array, not the first.

Link: https://www.gnu.org/software/make/manual/html_node/Job-Slots.html
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
This commit is contained in:
Masahiro Yamada 2022-11-15 03:10:55 +09:00
parent be5ea98983
commit f8f4dc7685
1 changed files with 3 additions and 1 deletions
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scripts/jobserver-exec
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@ -23,7 +23,9 @@ try:
opts = [x for x in flags.split(" ") if x.startswith("--jobserver")]
# Parse out R,W file descriptor numbers and set them nonblocking.
fds = opts[0].split("=", 1)[1]
# 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.