These functions transform an existing argv into one suitable
for exec-ing or spawning via git or a shell. We can use an
argv_array in each to avoid dealing with manual counting and
allocation.
This also makes the memory allocation more clear and fixes
some leaks. In prepare_shell_cmd, we would sometimes
allocate a new string with "$@" in it and sometimes not,
meaning the caller could not correctly free it. On the
non-Windows side, we are in a child process which will
exec() or exit() immediately, so the leak isn't a big deal.
On Windows, though, we use spawn() from the parent process,
and leak a string for each shell command we run. On top of
that, the Windows code did not free the allocated argv array
at all (but does for the prepare_git_cmd case!).
By switching both of these functions to write into an
argv_array, we can consistently free the result as
appropriate.
Signed-off-by: Jeff King <peff@xxxxxxxx>
---
Note that I had to touch the Windows run-command code here, but I don't
actually have a platform to test it on.
exec_cmd.c | 28 +++++++++++-----------------
exec_cmd.h | 4 +++-
run-command.c | 60 +++++++++++++++++++++++++----------------------------------
3 files changed, 39 insertions(+), 53 deletions(-)
diff --git a/exec_cmd.c b/exec_cmd.c
index e85f0fd..cf442a9 100644
--- a/exec_cmd.c
+++ b/exec_cmd.c
@@ -1,6 +1,7 @@
#include "cache.h"
#include "exec_cmd.h"
#include "quote.h"
+#include "argv-array.h"
#define MAX_ARGS 32
static const char *argv_exec_path;
@@ -107,32 +108,25 @@ void setup_path(void)
strbuf_release(&new_path);
}
-const char **prepare_git_cmd(const char **argv)
+const char **prepare_git_cmd(struct argv_array *out, const char **argv)
{
- int argc;
- const char **nargv;
-
- for (argc = 0; argv[argc]; argc++)
- ; /* just counting */
- nargv = xmalloc(sizeof(*nargv) * (argc + 2));
-
- nargv[0] = "git";
- for (argc = 0; argv[argc]; argc++)
- nargv[argc + 1] = argv[argc];
- nargv[argc + 1] = NULL;
- return nargv;
+ argv_array_push(out, "git");
+ argv_array_pushv(out, argv);
+ return out->argv;
}
int execv_git_cmd(const char **argv) {
- const char **nargv = prepare_git_cmd(argv);
- trace_argv_printf(nargv, "trace: exec:");
+ struct argv_array nargv = ARGV_ARRAY_INIT;
+
+ prepare_git_cmd(&nargv, argv);
+ trace_argv_printf(nargv.argv, "trace: exec:");
/* execvp() can only ever return if it fails */
- sane_execvp("git", (char **)nargv);
+ sane_execvp("git", (char **)nargv.argv);
trace_printf("trace: exec failed: %s\n", strerror(errno));
- free(nargv);
+ argv_array_clear(&nargv);
return -1;
}
diff --git a/exec_cmd.h b/exec_cmd.h
index 93b0c02..1f6b433 100644
--- a/exec_cmd.h
+++ b/exec_cmd.h
@@ -1,11 +1,13 @@
#ifndef GIT_EXEC_CMD_H
#define GIT_EXEC_CMD_H
+struct argv_array;
+
extern void git_set_argv_exec_path(const char *exec_path);
extern const char *git_extract_argv0_path(const char *path);
extern const char *git_exec_path(void);
extern void setup_path(void);
-extern const char **prepare_git_cmd(const char **argv);
+extern const char **prepare_git_cmd(struct argv_array *out, const char **argv);
extern int execv_git_cmd(const char **argv); /* NULL terminated */
LAST_ARG_MUST_BE_NULL
extern int execl_git_cmd(const char *cmd, ...);
diff --git a/run-command.c b/run-command.c
index cdf0184..019f6d1 100644
--- a/run-command.c
+++ b/run-command.c
@@ -160,50 +160,41 @@ int sane_execvp(const char *file, char * const argv[])
return -1;
}
-static const char **prepare_shell_cmd(const char **argv)
+static const char **prepare_shell_cmd(struct argv_array *out, const char **argv)
{
- int argc, nargc = 0;
- const char **nargv;
-
- for (argc = 0; argv[argc]; argc++)
- ; /* just counting */
- /* +1 for NULL, +3 for "sh -c" plus extra $0 */
- nargv = xmalloc(sizeof(*nargv) * (argc + 1 + 3));
-
- if (argc < 1)
+ if (!argv[0])
die("BUG: shell command is empty");
if (strcspn(argv[0], "|&;<>()$`\\\"' \t\n*?[#~=%") != strlen(argv[0])) {
#ifndef GIT_WINDOWS_NATIVE
- nargv[nargc++] = SHELL_PATH;
+ argv_array_push(out, SHELL_PATH);
#else
- nargv[nargc++] = "sh";
+ argv_array_push(out, "sh");
#endif
- nargv[nargc++] = "-c";
-
- if (argc < 2)
- nargv[nargc++] = argv[0];
- else {
- struct strbuf arg0 = STRBUF_INIT;
- strbuf_addf(&arg0, "%s \"$@\"", argv[0]);
- nargv[nargc++] = strbuf_detach(&arg0, NULL);
- }
- }
+ argv_array_push(out, "-c");
- for (argc = 0; argv[argc]; argc++)
- nargv[nargc++] = argv[argc];
- nargv[nargc] = NULL;
+ /*
+ * If we have no extra arguments, we do not even need to
+ * bother with the "$@" magic.
+ */
+ if (!argv[1])
+ argv_array_push(out, argv[0]);
+ else
+ argv_array_pushf(out, "%s \"$@\"", argv[0]);
+ }
- return nargv;
+ argv_array_pushv(out, argv);
+ return out->argv;
}
#ifndef GIT_WINDOWS_NATIVE
static int execv_shell_cmd(const char **argv)
{
- const char **nargv = prepare_shell_cmd(argv);
- trace_argv_printf(nargv, "trace: exec:");
- sane_execvp(nargv[0], (char **)nargv);
- free(nargv);
+ struct argv_array nargv = ARGV_ARRAY_INIT;
+ prepare_shell_cmd(&nargv, argv);
+ trace_argv_printf(nargv.argv, "trace: exec:");
+ sane_execvp(nargv.argv[0], (char **)nargv.argv);
+ argv_array_clear(&nargv);
return -1;
}
#endif
@@ -457,6 +448,7 @@ fail_pipe:
{
int fhin = 0, fhout = 1, fherr = 2;
const char **sargv = cmd->argv;
+ struct argv_array nargv = ARGV_ARRAY_INIT;
if (cmd->no_stdin)
fhin = open("/dev/null", O_RDWR);
@@ -482,9 +474,9 @@ fail_pipe:
fhout = dup(cmd->out);
if (cmd->git_cmd)
- cmd->argv = prepare_git_cmd(cmd->argv);
+ cmd->argv = prepare_git_cmd(&nargv, cmd->argv);
else if (cmd->use_shell)
- cmd->argv = prepare_shell_cmd(cmd->argv);
+ cmd->argv = prepare_shell_cmd(&nargv, cmd->argv);
cmd->pid = mingw_spawnvpe(cmd->argv[0], cmd->argv, (char**) cmd->env,
cmd->dir, fhin, fhout, fherr);
@@ -494,9 +486,7 @@ fail_pipe:
if (cmd->clean_on_exit && cmd->pid >= 0)
mark_child_for_cleanup(cmd->pid);
- if (cmd->git_cmd)
- free(cmd->argv);
-
+ argv_array_clear(&nargv);
cmd->argv = sargv;
if (fhin != 0)
close(fhin);
--
2.7.1.577.gfed91b8
--
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