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-rw-r--r--Documentation/git.txt7
-rw-r--r--exec_cmd.c19
-rw-r--r--git.c25
-rw-r--r--quote.c17
-rw-r--r--quote.h1
-rwxr-xr-xt/test-lib.sh1
6 files changed, 70 insertions, 0 deletions
diff --git a/Documentation/git.txt b/Documentation/git.txt
index d00cc3e..ce30581 100644
--- a/Documentation/git.txt
+++ b/Documentation/git.txt
@@ -615,6 +615,13 @@ git Diffs
gitlink:git-diff-files[1];
gitlink:git-diff-tree[1]
+other
+~~~~~
+'GIT_TRACE'::
+ If this variable is set git will print `trace:` messages on
+ stderr telling about alias expansion, built-in command
+ execution and external command execution.
+
Discussion[[Discussion]]
------------------------
include::README[]
diff --git a/exec_cmd.c b/exec_cmd.c
index c1539d1..62f51fc 100644
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -1,5 +1,6 @@
#include "cache.h"
#include "exec_cmd.h"
+#include "quote.h"
#define MAX_ARGS 32
extern char **environ;
@@ -96,9 +97,27 @@ int execv_git_cmd(const char **argv)
tmp = argv[0];
argv[0] = git_command;
+ if (getenv("GIT_TRACE")) {
+ const char **p = argv;
+ fputs("trace: exec:", stderr);
+ while (*p) {
+ fputc(' ', stderr);
+ sq_quote_print(stderr, *p);
+ ++p;
+ }
+ putc('\n', stderr);
+ fflush(stderr);
+ }
+
/* execve() can only ever return if it fails */
execve(git_command, (char **)argv, environ);
+ if (getenv("GIT_TRACE")) {
+ fprintf(stderr, "trace: exec failed: %s\n",
+ strerror(errno));
+ fflush(stderr);
+ }
+
argv[0] = tmp;
}
return -1;
diff --git a/git.c b/git.c
index fee7138..102735a 100644
--- a/git.c
+++ b/git.c
@@ -11,6 +11,7 @@
#include "git-compat-util.h"
#include "exec_cmd.h"
#include "cache.h"
+#include "quote.h"
#include "builtin.h"
@@ -120,6 +121,18 @@ static int handle_alias(int *argcp, const char ***argv)
if (!strcmp(alias_command, new_argv[0]))
die("recursive alias: %s", alias_command);
+ if (getenv("GIT_TRACE")) {
+ int i;
+ fprintf(stderr, "trace: alias expansion: %s =>",
+ alias_command);
+ for (i = 0; i < count; ++i) {
+ fputc(' ', stderr);
+ sq_quote_print(stderr, new_argv[i]);
+ }
+ fputc('\n', stderr);
+ fflush(stderr);
+ }
+
/* insert after command name */
if (*argcp > 1) {
new_argv = realloc(new_argv, sizeof(char*) *
@@ -203,6 +216,18 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
struct cmd_struct *p = commands+i;
if (strcmp(p->cmd, cmd))
continue;
+
+ if (getenv("GIT_TRACE")) {
+ int i;
+ fprintf(stderr, "trace: built-in: git");
+ for (i = 0; i < argc; ++i) {
+ fputc(' ', stderr);
+ sq_quote_print(stderr, argv[i]);
+ }
+ putc('\n', stderr);
+ fflush(stderr);
+ }
+
exit(p->fn(argc, argv, envp));
}
}
diff --git a/quote.c b/quote.c
index 1910d00..e220dcc 100644
--- a/quote.c
+++ b/quote.c
@@ -45,6 +45,23 @@ size_t sq_quote_buf(char *dst, size_t n, const char *src)
return len;
}
+void sq_quote_print(FILE *stream, const char *src)
+{
+ char c;
+
+ fputc('\'', stream);
+ while ((c = *src++)) {
+ if (need_bs_quote(c)) {
+ fputs("'\\", stream);
+ fputc(c, stream);
+ fputc('\'', stream);
+ } else {
+ fputc(c, stream);
+ }
+ }
+ fputc('\'', stream);
+}
+
char *sq_quote(const char *src)
{
char *buf;
diff --git a/quote.h b/quote.h
index c1ab378..fc5481e 100644
--- a/quote.h
+++ b/quote.h
@@ -29,6 +29,7 @@
*/
extern char *sq_quote(const char *src);
+extern void sq_quote_print(FILE *stream, const char *src);
extern size_t sq_quote_buf(char *dst, size_t n, const char *src);
/* This unwraps what sq_quote() produces in place, but returns
diff --git a/t/test-lib.sh b/t/test-lib.sh
index b0d7990..470a909 100755
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -28,6 +28,7 @@ unset GIT_DIR
unset GIT_EXTERNAL_DIFF
unset GIT_INDEX_FILE
unset GIT_OBJECT_DIRECTORY
+unset GIT_TRACE
unset SHA1_FILE_DIRECTORIES
unset SHA1_FILE_DIRECTORY
export GIT_AUTHOR_EMAIL GIT_AUTHOR_NAME