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cfg.mk: block use of d_type from dirent by default

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The use of d_type is non-portable and leads to surprises when the OS
does not fill in any value except DT_UNKNOWN. Blacklist its usage
except in files which inherantly don't require portability (cgroups).

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2019-04-02 13:33:06 +01:00
parent c1ac1e4637
commit 86cc922e31
1 changed files with 16 additions and 0 deletions
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16
cfg.mk
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@ -1083,6 +1083,19 @@ sc_prohibit_class:
halt='use klass instead of class or _class' \
$(_sc_search_regexp)
# The dirent "d_type" field is non-portable and even when it
# exists some filesystems will only ever return DT_UNKNOWN.
# This field should only be used by code which is exclusively
# run platforms supporting "d_type" and must expect DT_UNKNOWN.
# We blacklist it to discourage accidental usage which has
# happened many times. Add an exclude rule if it is genuinely
# needed and the above restrictions are acceptable.
sc_prohibit_dirent_d_type:
@prohibit='(->|\.)d_type' \
in_vc_files='\.[chx]$$' \
halt='do not use the d_type field in "struct dirent"' \
$(_sc_search_regexp)
# We don't use this feature of maint.mk.
prev_version_file = /dev/null
@ -1337,3 +1350,6 @@ exclude_file_name_regexp--sc_prohibit_readdir = \
exclude_file_name_regexp--sc_prohibit_cross_inclusion = \
^(src/util/virclosecallbacks\.h|src/util/virhostdev\.h)$$
exclude_file_name_regexp--sc_prohibit_dirent_d_type = \
^(src/util/vircgroup.c)$