If PORTAGE_LOG_FILTER_FILE_CMD fails after exec, then output will be lost. Therefore, suggest to use bash as a supervisor, with fallback to cat.
Bug: https://bugs.gentoo.org/781854 Signed-off-by: Zac Medico <zmed...@gentoo.org> --- man/make.conf.5 | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/man/make.conf.5 b/man/make.conf.5 index 8d551c95e..8a4a2ae30 100644 --- a/man/make.conf.5 +++ b/man/make.conf.5 @@ -1,4 +1,4 @@ -.TH "MAKE.CONF" "5" "Feb 2021" "Portage VERSION" "Portage" +.TH "MAKE.CONF" "5" "Apr 2021" "Portage VERSION" "Portage" .SH "NAME" make.conf \- custom settings for Portage .SH "SYNOPSIS" @@ -998,7 +998,18 @@ will set idle io priority. For more information about ionice, see .B PORTAGE_LOG_FILTER_FILE_CMD This variable specifies a command that filters build log output to a log file. In order to filter ANSI escape codes from build logs, -\fBansifilter\fR(1) is a convenient setting for this variable. +\fBansifilter\fR(1) is a convenient setting for this variable. Generally, +PORTAGE_LOG_FILTER_FILE_CMD should include a supervisor that falls back +to cat if the real filter command fails after exec. For example, a +supervisor is needed for ansifilter, in case it fails after exec due to +a problem resolving libstdc++ during a gcc upgrade. +.br +.I Example: +.nf +# Use bash as a supervisor, for fallback to cat if asifilter fails +# after exec due to a problem resolving libstdc++ during a gcc upgrade. +PORTAGE_LOG_FILTER_FILE_CMD="bash -c \\"ansifilter; exec cat\\"" +.fi .TP .B PORTAGE_LOGDIR This variable defines the directory in which per\-ebuild logs are kept. -- 2.26.2
