diff options
Diffstat (limited to 'trace.c')
| -rw-r--r-- | trace.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/trace.c b/trace.c new file mode 100644 index 0000000000..d95341693f --- /dev/null +++ b/trace.c @@ -0,0 +1,188 @@ +/* + * GIT - The information manager from hell + * + * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org> + * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net> + * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu> + * Copyright (C) 2006 Mike McCormack + * Copyright (C) 2006 Christian Couder + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "cache.h" +#include "quote.h" + +/* Get a trace file descriptor from "key" env variable. */ +static int get_trace_fd(const char *key, int *need_close) +{ + char *trace = getenv(key); + + if (!trace || !strcmp(trace, "") || + !strcmp(trace, "0") || !strcasecmp(trace, "false")) + return 0; + if (!strcmp(trace, "1") || !strcasecmp(trace, "true")) + return STDERR_FILENO; + if (strlen(trace) == 1 && isdigit(*trace)) + return atoi(trace); + if (is_absolute_path(trace)) { + int fd = open(trace, O_WRONLY | O_APPEND | O_CREAT, 0666); + if (fd == -1) { + fprintf(stderr, + "Could not open '%s' for tracing: %s\n" + "Defaulting to tracing on stderr...\n", + trace, strerror(errno)); + return STDERR_FILENO; + } + *need_close = 1; + return fd; + } + + fprintf(stderr, "What does '%s' for %s mean?\n", trace, key); + fprintf(stderr, "If you want to trace into a file, " + "then please set %s to an absolute pathname " + "(starting with /).\n", key); + fprintf(stderr, "Defaulting to tracing on stderr...\n"); + + return STDERR_FILENO; +} + +static const char err_msg[] = "Could not trace into fd given by " + "GIT_TRACE environment variable"; + +void trace_vprintf(const char *key, const char *fmt, va_list ap) +{ + struct strbuf buf = STRBUF_INIT; + + if (!trace_want(key)) + return; + + set_try_to_free_routine(NULL); /* is never reset */ + strbuf_vaddf(&buf, fmt, ap); + trace_strbuf(key, &buf); + strbuf_release(&buf); +} + +static void trace_printf_key(const char *key, const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + trace_vprintf(key, fmt, ap); + va_end(ap); +} + +void trace_printf(const char *fmt, ...) +{ + va_list ap; + va_start(ap, fmt); + trace_vprintf("GIT_TRACE", fmt, ap); + va_end(ap); +} + +void trace_strbuf(const char *key, const struct strbuf *buf) +{ + int fd, need_close = 0; + + fd = get_trace_fd(key, &need_close); + if (!fd) + return; + + write_or_whine_pipe(fd, buf->buf, buf->len, err_msg); + + if (need_close) + close(fd); +} + +void trace_argv_printf(const char **argv, const char *fmt, ...) +{ + struct strbuf buf = STRBUF_INIT; + va_list ap; + int fd, need_close = 0; + + fd = get_trace_fd("GIT_TRACE", &need_close); + if (!fd) + return; + + set_try_to_free_routine(NULL); /* is never reset */ + va_start(ap, fmt); + strbuf_vaddf(&buf, fmt, ap); + va_end(ap); + + sq_quote_argv(&buf, argv, 0); + strbuf_addch(&buf, '\n'); + write_or_whine_pipe(fd, buf.buf, buf.len, err_msg); + strbuf_release(&buf); + + if (need_close) + close(fd); +} + +static const char *quote_crnl(const char *path) +{ + static char new_path[PATH_MAX]; + const char *p2 = path; + char *p1 = new_path; + + if (!path) + return NULL; + + while (*p2) { + switch (*p2) { + case '\\': *p1++ = '\\'; *p1++ = '\\'; break; + case '\n': *p1++ = '\\'; *p1++ = 'n'; break; + case '\r': *p1++ = '\\'; *p1++ = 'r'; break; + default: + *p1++ = *p2; + } + p2++; + } + *p1 = '\0'; + return new_path; +} + +/* FIXME: move prefix to startup_info struct and get rid of this arg */ +void trace_repo_setup(const char *prefix) +{ + static const char *key = "GIT_TRACE_SETUP"; + const char *git_work_tree; + char cwd[PATH_MAX]; + + if (!trace_want(key)) + return; + + if (!getcwd(cwd, PATH_MAX)) + die("Unable to get current working directory"); + + if (!(git_work_tree = get_git_work_tree())) + git_work_tree = "(null)"; + + if (!prefix) + prefix = "(null)"; + + trace_printf_key(key, "setup: git_dir: %s\n", quote_crnl(get_git_dir())); + trace_printf_key(key, "setup: worktree: %s\n", quote_crnl(git_work_tree)); + trace_printf_key(key, "setup: cwd: %s\n", quote_crnl(cwd)); + trace_printf_key(key, "setup: prefix: %s\n", quote_crnl(prefix)); +} + +int trace_want(const char *key) +{ + const char *trace = getenv(key); + + if (!trace || !strcmp(trace, "") || + !strcmp(trace, "0") || !strcasecmp(trace, "false")) + return 0; + return 1; +} |