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[31.179.0.202]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-a6fcf560526sm193940766b.152.2024.06.22.06.01.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 22 Jun 2024 06:01:19 -0700 (PDT) From: Roman Storozhenko Date: Sat, 22 Jun 2024 15:01:07 +0200 Subject: [PATCH v2] cpupower: Make help command available for custom install dir Precedence: bulk X-Mailing-List: linux-pm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240622-fix-help-issue-v2-1-6c19e28a4ec1@gmail.com> X-B4-Tracking: v=1; b=H4sIABLLdmYC/13MQQ6CMBCF4auQWTumrbVYVt7DsKAwwiRASatEQ 3p3K3Hl8p/M+zaIFJgiVMUGgVaO7Occ6lBAOzRzT8hdblBCaWGkxTu/cKBxQY7xSXguT60Wzhm tSsijJVD+2MFbnXvg+PDhvfur/F5/lJL/1CpRYmmFsfbSaUPu2k8Nj8fWT1CnlD7Ap4KMrAAAA A== To: Thomas Renninger , Shuah Khan Cc: Javier Carrasco , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, Roman Storozhenko X-Mailer: b4 0.14.0 When the 'cpupower' utility installed in the custom dir, it fails to render appropriate help info for a particular subcommand: $ LD_LIBRARY_PATH=lib64/ bin/cpupower help monitor with error message like 'No manual entry for cpupower-monitor.1' The issue is that under the hood it calls 'exec' function with the following args: 'man cpupower-monitor.1'. In turn, 'man' search path is defined in '/etc/manpath.config'. Of course it contains only standard system man paths. Make subcommands help available for a user by setting up 'MANPATH' environment variable to the custom installation man pages dir. That variable value will be prepended to the man pages standard search paths as described in 'SEARCH PATH' section of MANPATH(5). Signed-off-by: Roman Storozhenko --- Changes in v2: - Fixed spelling errors - Simplified man pages search approach by the 'MANPATH' variable usage - Link to v1: https://lore.kernel.org/r/20240621-fix-help-issue-v1-1-7906998d46eb@gmail.com --- tools/power/cpupower/utils/cpupower.c | 41 ++++++++++++++++++++++++++++++----- 1 file changed, 35 insertions(+), 6 deletions(-) --- base-commit: 2102cb0d050d34d50b9642a3a50861787527e922 change-id: 20240619-fix-help-issue-573c40bb6427 Best regards, diff --git a/tools/power/cpupower/utils/cpupower.c b/tools/power/cpupower/utils/cpupower.c index 9ec973165af1..1b1b79c572ad 100644 --- a/tools/power/cpupower/utils/cpupower.c +++ b/tools/power/cpupower/utils/cpupower.c @@ -12,6 +12,8 @@ #include #include #include +#include +#include #include #include #include @@ -80,14 +82,17 @@ static void print_help(void) static int print_man_page(const char *subpage) { - int len; - char *page; + char *page, *man_path, *exec_dir; + char exec_path[PATH_MAX]; + int subpage_len; - len = 10; /* enough for "cpupower-" */ - if (subpage != NULL) - len += strlen(subpage); + if (!subpage) + return -EINVAL; - page = malloc(len); + subpage_len = 10; /* enough for "cpupower-" */ + subpage_len += strlen(subpage); + + page = malloc(subpage_len); if (!page) return -ENOMEM; @@ -97,6 +102,30 @@ static int print_man_page(const char *subpage) strcat(page, subpage); } + /* Get current process image name full path */ + if (readlink("/proc/self/exe", exec_path, PATH_MAX) > 0) { + exec_dir = strdup(exec_path); + if (!exec_dir) { + free(page); + free(man_path); + return -ENOMEM; + } + + /* Prepend standard search path for man pages with relative path + * to custom install man directory + */ + if (asprintf(&man_path, "%s/../man:", dirname(exec_dir)) > 0) { + setenv("MANPATH", man_path, 1); + free(exec_dir); + free(man_path); + } else { + free(page); + free(exec_dir); + free(man_path); + return -ENOMEM; + } + } + execlp("man", "man", page, NULL); /* should not be reached */