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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Many source files in the tree are missing licensing information, which makes it harder for compliance tools to determine the correct license. By default all files without license information are under the default license of the kernel, which is GPL version 2. Update the files which contain no license information with the 'GPL-2.0' SPDX license identifier. The SPDX identifier is a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. How this work was done: Patches were generated and checked against linux-4.14-rc6 for a subset of the use cases: - file had no licensing information it it. - file was a */uapi/* one with no licensing information in it, - file was a */uapi/* one with existing licensing information, Further patches will be generated in subsequent months to fix up cases where non-standard license headers were used, and references to license had to be inferred by heuristics based on keywords. The analysis to determine which SPDX License Identifier to be applied to a file was done in a spreadsheet of side by side results from of the output of two independent scanners (ScanCode & Windriver) producing SPDX tag:value files created by Philippe Ombredanne. Philippe prepared the base worksheet, and did an initial spot review of a few 1000 files. The 4.13 kernel was the starting point of the analysis with 60,537 files assessed. Kate Stewart did a file by file comparison of the scanner results in the spreadsheet to determine which SPDX license identifier(s) to be applied to the file. She confirmed any determination that was not immediately clear with lawyers working with the Linux Foundation. Criteria used to select files for SPDX license identifier tagging was: - Files considered eligible had to be source code files. - Make and config files were included as candidates if they contained >5 lines of source - File already had some variant of a license header in it (even if <5 lines). All documentation files were explicitly excluded. The following heuristics were used to determine which SPDX license identifiers to apply. - when both scanners couldn't find any license traces, file was considered to have no license information in it, and the top level COPYING file license applied. For non */uapi/* files that summary was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 11139 and resulted in the first patch in this series. If that file was a */uapi/* path one, it was "GPL-2.0 WITH Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was: SPDX license identifier # files ---------------------------------------------------|------- GPL-2.0 WITH Linux-syscall-note 930 and resulted in the second patch in this series. - if a file had some form of licensing information in it, and was one of the */uapi/* ones, it was denoted with the Linux-syscall-note if any GPL family license was found in the file or had no licensing in it (per prior point). Results summary: SPDX license identifier # files ---------------------------------------------------|------ GPL-2.0 WITH Linux-syscall-note 270 GPL-2.0+ WITH Linux-syscall-note 169 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21 ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17 LGPL-2.1+ WITH Linux-syscall-note 15 GPL-1.0+ WITH Linux-syscall-note 14 ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5 LGPL-2.0+ WITH Linux-syscall-note 4 LGPL-2.1 WITH Linux-syscall-note 3 ((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3 ((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1 and that resulted in the third patch in this series. - when the two scanners agreed on the detected license(s), that became the concluded license(s). - when there was disagreement between the two scanners (one detected a license but the other didn't, or they both detected different licenses) a manual inspection of the file occurred. - In most cases a manual inspection of the information in the file resulted in a clear resolution of the license that should apply (and which scanner probably needed to revisit its heuristics). - When it was not immediately clear, the license identifier was confirmed with lawyers working with the Linux Foundation. - If there was any question as to the appropriate license identifier, the file was flagged for further research and to be revisited later in time. In total, over 70 hours of logged manual review was done on the spreadsheet to determine the SPDX license identifiers to apply to the source files by Kate, Philippe, Thomas and, in some cases, confirmation by lawyers working with the Linux Foundation. Kate also obtained a third independent scan of the 4.13 code base from FOSSology, and compared selected files where the other two scanners disagreed against that SPDX file, to see if there was new insights. The Windriver scanner is based on an older version of FOSSology in part, so they are related. Thomas did random spot checks in about 500 files from the spreadsheets for the uapi headers and agreed with SPDX license identifier in the files he inspected. For the non-uapi files Thomas did random spot checks in about 15000 files. In initial set of patches against 4.14-rc6, 3 files were found to have copy/paste license identifier errors, and have been fixed to reflect the correct identifier. Additionally Philippe spent 10 hours this week doing a detailed manual inspection and review of the 12,461 patched files from the initial patch version early this week with: - a full scancode scan run, collecting the matched texts, detected license ids and scores - reviewing anything where there was a license detected (about 500+ files) to ensure that the applied SPDX license was correct - reviewing anything where there was no detection but the patch license was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied SPDX license was correct This produced a worksheet with 20 files needing minor correction. This worksheet was then exported into 3 different .csv files for the different types of files to be modified. These .csv files were then reviewed by Greg. Thomas wrote a script to parse the csv files and add the proper SPDX tag to the file, in the format that the file expected. This script was further refined by Greg based on the output to detect more types of files automatically and to distinguish between header and source .c files (which need different comment types.) Finally Greg ran the script using the .csv files to generate the patches. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
493 lines
12 KiB
C
493 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* builtin-help.c
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*
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* Builtin help command
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*/
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#include "perf.h"
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#include "util/config.h"
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#include "builtin.h"
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#include <subcmd/exec-cmd.h>
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#include "common-cmds.h"
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#include <subcmd/parse-options.h>
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#include <subcmd/run-command.h>
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#include <subcmd/help.h>
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#include "util/debug.h"
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#include <linux/kernel.h>
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#include <errno.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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static struct man_viewer_list {
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struct man_viewer_list *next;
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char name[0];
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} *man_viewer_list;
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static struct man_viewer_info_list {
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struct man_viewer_info_list *next;
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const char *info;
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char name[0];
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} *man_viewer_info_list;
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enum help_format {
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HELP_FORMAT_NONE,
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HELP_FORMAT_MAN,
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HELP_FORMAT_INFO,
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HELP_FORMAT_WEB,
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};
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static enum help_format parse_help_format(const char *format)
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{
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if (!strcmp(format, "man"))
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return HELP_FORMAT_MAN;
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if (!strcmp(format, "info"))
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return HELP_FORMAT_INFO;
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if (!strcmp(format, "web") || !strcmp(format, "html"))
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return HELP_FORMAT_WEB;
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pr_err("unrecognized help format '%s'", format);
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return HELP_FORMAT_NONE;
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}
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static const char *get_man_viewer_info(const char *name)
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{
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struct man_viewer_info_list *viewer;
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for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
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if (!strcasecmp(name, viewer->name))
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return viewer->info;
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}
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return NULL;
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}
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static int check_emacsclient_version(void)
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{
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struct strbuf buffer = STRBUF_INIT;
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struct child_process ec_process;
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const char *argv_ec[] = { "emacsclient", "--version", NULL };
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int version;
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int ret = -1;
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/* emacsclient prints its version number on stderr */
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memset(&ec_process, 0, sizeof(ec_process));
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ec_process.argv = argv_ec;
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ec_process.err = -1;
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ec_process.stdout_to_stderr = 1;
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if (start_command(&ec_process)) {
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fprintf(stderr, "Failed to start emacsclient.\n");
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return -1;
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}
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if (strbuf_read(&buffer, ec_process.err, 20) < 0) {
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fprintf(stderr, "Failed to read emacsclient version\n");
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goto out;
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}
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close(ec_process.err);
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/*
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* Don't bother checking return value, because "emacsclient --version"
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* seems to always exits with code 1.
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*/
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finish_command(&ec_process);
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if (!strstarts(buffer.buf, "emacsclient")) {
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fprintf(stderr, "Failed to parse emacsclient version.\n");
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goto out;
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}
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version = atoi(buffer.buf + strlen("emacsclient"));
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if (version < 22) {
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fprintf(stderr,
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"emacsclient version '%d' too old (< 22).\n",
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version);
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} else
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ret = 0;
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out:
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strbuf_release(&buffer);
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return ret;
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}
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static void exec_failed(const char *cmd)
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{
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char sbuf[STRERR_BUFSIZE];
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pr_warning("failed to exec '%s': %s", cmd, str_error_r(errno, sbuf, sizeof(sbuf)));
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}
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static void exec_woman_emacs(const char *path, const char *page)
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{
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if (!check_emacsclient_version()) {
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/* This works only with emacsclient version >= 22. */
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char *man_page;
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if (!path)
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path = "emacsclient";
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if (asprintf(&man_page, "(woman \"%s\")", page) > 0) {
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execlp(path, "emacsclient", "-e", man_page, NULL);
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free(man_page);
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}
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exec_failed(path);
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}
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}
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static void exec_man_konqueror(const char *path, const char *page)
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{
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const char *display = getenv("DISPLAY");
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if (display && *display) {
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char *man_page;
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const char *filename = "kfmclient";
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/* It's simpler to launch konqueror using kfmclient. */
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if (path) {
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const char *file = strrchr(path, '/');
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if (file && !strcmp(file + 1, "konqueror")) {
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char *new = strdup(path);
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char *dest = strrchr(new, '/');
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/* strlen("konqueror") == strlen("kfmclient") */
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strcpy(dest + 1, "kfmclient");
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path = new;
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}
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if (file)
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filename = file;
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} else
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path = "kfmclient";
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if (asprintf(&man_page, "man:%s(1)", page) > 0) {
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execlp(path, filename, "newTab", man_page, NULL);
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free(man_page);
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}
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exec_failed(path);
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}
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}
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static void exec_man_man(const char *path, const char *page)
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{
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if (!path)
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path = "man";
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execlp(path, "man", page, NULL);
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exec_failed(path);
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}
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static void exec_man_cmd(const char *cmd, const char *page)
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{
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char *shell_cmd;
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if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) {
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execl("/bin/sh", "sh", "-c", shell_cmd, NULL);
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free(shell_cmd);
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}
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exec_failed(cmd);
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}
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static void add_man_viewer(const char *name)
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{
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struct man_viewer_list **p = &man_viewer_list;
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size_t len = strlen(name);
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while (*p)
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p = &((*p)->next);
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*p = zalloc(sizeof(**p) + len + 1);
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strncpy((*p)->name, name, len);
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}
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static int supported_man_viewer(const char *name, size_t len)
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{
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return (!strncasecmp("man", name, len) ||
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!strncasecmp("woman", name, len) ||
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!strncasecmp("konqueror", name, len));
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}
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static void do_add_man_viewer_info(const char *name,
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size_t len,
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const char *value)
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{
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struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
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strncpy(new->name, name, len);
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new->info = strdup(value);
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new->next = man_viewer_info_list;
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man_viewer_info_list = new;
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}
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static void unsupported_man_viewer(const char *name, const char *var)
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{
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pr_warning("'%s': path for unsupported man viewer.\n"
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"Please consider using 'man.<tool>.%s' instead.", name, var);
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}
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static int add_man_viewer_path(const char *name,
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size_t len,
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const char *value)
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{
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if (supported_man_viewer(name, len))
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do_add_man_viewer_info(name, len, value);
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else
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unsupported_man_viewer(name, "cmd");
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return 0;
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}
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static int add_man_viewer_cmd(const char *name,
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size_t len,
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const char *value)
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{
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if (supported_man_viewer(name, len))
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unsupported_man_viewer(name, "path");
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else
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do_add_man_viewer_info(name, len, value);
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return 0;
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}
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static int add_man_viewer_info(const char *var, const char *value)
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{
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const char *name = var + 4;
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const char *subkey = strrchr(name, '.');
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if (!subkey) {
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pr_err("Config with no key for man viewer: %s", name);
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return -1;
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}
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if (!strcmp(subkey, ".path")) {
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if (!value)
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return config_error_nonbool(var);
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return add_man_viewer_path(name, subkey - name, value);
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}
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if (!strcmp(subkey, ".cmd")) {
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if (!value)
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return config_error_nonbool(var);
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return add_man_viewer_cmd(name, subkey - name, value);
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}
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pr_warning("'%s': unsupported man viewer sub key.", subkey);
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return 0;
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}
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static int perf_help_config(const char *var, const char *value, void *cb)
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{
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enum help_format *help_formatp = cb;
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if (!strcmp(var, "help.format")) {
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if (!value)
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return config_error_nonbool(var);
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*help_formatp = parse_help_format(value);
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if (*help_formatp == HELP_FORMAT_NONE)
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return -1;
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return 0;
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}
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if (!strcmp(var, "man.viewer")) {
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if (!value)
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return config_error_nonbool(var);
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add_man_viewer(value);
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return 0;
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}
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if (!strstarts(var, "man."))
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return add_man_viewer_info(var, value);
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return 0;
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}
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static struct cmdnames main_cmds, other_cmds;
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void list_common_cmds_help(void)
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{
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unsigned int i, longest = 0;
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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if (longest < strlen(common_cmds[i].name))
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longest = strlen(common_cmds[i].name);
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}
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puts(" The most commonly used perf commands are:");
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for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
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printf(" %-*s ", longest, common_cmds[i].name);
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puts(common_cmds[i].help);
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}
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}
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static const char *cmd_to_page(const char *perf_cmd)
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{
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char *s;
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if (!perf_cmd)
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return "perf";
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else if (!strstarts(perf_cmd, "perf"))
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return perf_cmd;
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return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
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}
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static void setup_man_path(void)
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{
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char *new_path;
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const char *old_path = getenv("MANPATH");
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/* We should always put ':' after our path. If there is no
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* old_path, the ':' at the end will let 'man' to try
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* system-wide paths after ours to find the manual page. If
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* there is old_path, we need ':' as delimiter. */
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if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) {
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setenv("MANPATH", new_path, 1);
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free(new_path);
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} else {
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pr_err("Unable to setup man path");
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}
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}
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static void exec_viewer(const char *name, const char *page)
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{
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const char *info = get_man_viewer_info(name);
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if (!strcasecmp(name, "man"))
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exec_man_man(info, page);
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else if (!strcasecmp(name, "woman"))
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exec_woman_emacs(info, page);
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else if (!strcasecmp(name, "konqueror"))
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exec_man_konqueror(info, page);
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else if (info)
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exec_man_cmd(info, page);
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else
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pr_warning("'%s': unknown man viewer.", name);
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}
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static int show_man_page(const char *perf_cmd)
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{
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struct man_viewer_list *viewer;
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const char *page = cmd_to_page(perf_cmd);
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const char *fallback = getenv("PERF_MAN_VIEWER");
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setup_man_path();
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for (viewer = man_viewer_list; viewer; viewer = viewer->next)
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exec_viewer(viewer->name, page); /* will return when unable */
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if (fallback)
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exec_viewer(fallback, page);
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exec_viewer("man", page);
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pr_err("no man viewer handled the request");
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return -1;
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}
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static int show_info_page(const char *perf_cmd)
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{
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const char *page = cmd_to_page(perf_cmd);
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setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
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execlp("info", "info", "perfman", page, NULL);
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return -1;
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}
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static int get_html_page_path(char **page_path, const char *page)
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{
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struct stat st;
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const char *html_path = system_path(PERF_HTML_PATH);
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/* Check that we have a perf documentation directory. */
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if (stat(mkpath("%s/perf.html", html_path), &st)
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|| !S_ISREG(st.st_mode)) {
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pr_err("'%s': not a documentation directory.", html_path);
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return -1;
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}
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return asprintf(page_path, "%s/%s.html", html_path, page);
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}
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/*
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* If open_html is not defined in a platform-specific way (see for
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* example compat/mingw.h), we use the script web--browse to display
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* HTML.
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*/
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#ifndef open_html
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static void open_html(const char *path)
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{
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execl_cmd("web--browse", "-c", "help.browser", path, NULL);
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}
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#endif
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static int show_html_page(const char *perf_cmd)
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{
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const char *page = cmd_to_page(perf_cmd);
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char *page_path; /* it leaks but we exec bellow */
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if (get_html_page_path(&page_path, page) < 0)
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return -1;
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open_html(page_path);
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return 0;
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}
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int cmd_help(int argc, const char **argv)
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{
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bool show_all = false;
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enum help_format help_format = HELP_FORMAT_MAN;
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struct option builtin_help_options[] = {
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OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
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OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
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OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
|
|
HELP_FORMAT_WEB),
|
|
OPT_SET_UINT('i', "info", &help_format, "show info page",
|
|
HELP_FORMAT_INFO),
|
|
OPT_END(),
|
|
};
|
|
const char * const builtin_help_subcommands[] = {
|
|
"buildid-cache", "buildid-list", "diff", "evlist", "help", "list",
|
|
"record", "report", "bench", "stat", "timechart", "top", "annotate",
|
|
"script", "sched", "kallsyms", "kmem", "lock", "kvm", "test", "inject", "mem", "data",
|
|
#ifdef HAVE_LIBELF_SUPPORT
|
|
"probe",
|
|
#endif
|
|
#ifdef HAVE_LIBAUDIT_SUPPORT
|
|
"trace",
|
|
#endif
|
|
NULL };
|
|
const char *builtin_help_usage[] = {
|
|
"perf help [--all] [--man|--web|--info] [command]",
|
|
NULL
|
|
};
|
|
int rc;
|
|
|
|
load_command_list("perf-", &main_cmds, &other_cmds);
|
|
|
|
rc = perf_config(perf_help_config, &help_format);
|
|
if (rc)
|
|
return rc;
|
|
|
|
argc = parse_options_subcommand(argc, argv, builtin_help_options,
|
|
builtin_help_subcommands, builtin_help_usage, 0);
|
|
|
|
if (show_all) {
|
|
printf("\n Usage: %s\n\n", perf_usage_string);
|
|
list_commands("perf commands", &main_cmds, &other_cmds);
|
|
printf(" %s\n\n", perf_more_info_string);
|
|
return 0;
|
|
}
|
|
|
|
if (!argv[0]) {
|
|
printf("\n usage: %s\n\n", perf_usage_string);
|
|
list_common_cmds_help();
|
|
printf("\n %s\n\n", perf_more_info_string);
|
|
return 0;
|
|
}
|
|
|
|
switch (help_format) {
|
|
case HELP_FORMAT_MAN:
|
|
rc = show_man_page(argv[0]);
|
|
break;
|
|
case HELP_FORMAT_INFO:
|
|
rc = show_info_page(argv[0]);
|
|
break;
|
|
case HELP_FORMAT_WEB:
|
|
rc = show_html_page(argv[0]);
|
|
break;
|
|
case HELP_FORMAT_NONE:
|
|
/* fall-through */
|
|
default:
|
|
rc = -1;
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|