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package/procps-ng: add busybox-related comments to S02sysctl

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Explain the busybox peculiarities and how the script works with both
versions of the sysctl utility.

Signed-off-by: Carlos Santos <unixmania@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Carlos Santos 2020-03-29 20:49:23 -03:00 committed by Thomas Petazzoni
parent 8920c41a9d
commit 16de37d96b
1 changed files with 13 additions and 6 deletions
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19
package/procps-ng/S02sysctl
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@ -1,4 +1,17 @@
#!/bin/sh #!/bin/sh
#
# This script is used by busybox and procps-ng.
#
# With procps-ng, the "--system" option of sysctl also enables "--ignore", so
# errors are not reported via syslog. Use the run_logger function to mimic the
# --system behavior, still reporting errors via syslog. Users not interested
# on error reports can add "-e" to SYSCTL_ARGS.
#
# busybox does not have a "--system" option neither reports errors via syslog,
# so the scripting provides a consistent behavior between the implementations.
# Testing the busybox sysctl exit code is fruitless, as at the moment, since
# its exit status is zero even if errors happen. Hopefully this will be fixed
# in a future busybox version.
PROGRAM="sysctl" PROGRAM="sysctl"
@ -12,12 +25,6 @@ SYSCTL_ARGS=""
# symlinks to it. No attempt is made to prevent this. # symlinks to it. No attempt is made to prevent this.
SYSCTL_SOURCES="/etc/sysctl.d/ /usr/local/lib/sysctl.d/ /usr/lib/sysctl.d/ /lib/sysctl.d/ /etc/sysctl.conf" SYSCTL_SOURCES="/etc/sysctl.d/ /usr/local/lib/sysctl.d/ /usr/lib/sysctl.d/ /lib/sysctl.d/ /etc/sysctl.conf"
# The "--system" option activates "--ignore", which is bad because invalid
# variable settings in the configuration files will not be reported on the
# system log. Use some scripting to mimic the --system behavior but still
# reporting errors. Users not interested on error report can put "-e" in
# SYSCTL_ARGS.
#
# The file redirections do the following: # The file redirections do the following:
# #
# - stdout is redirected to syslog with facility.level "kern.info" # - stdout is redirected to syslog with facility.level "kern.info"