To unset a variable, just specify its name, without "=". For example:
const char *env[] = {"GIT_DIR=.git", "PWD", NULL};
const char *argv[] = {"git-ls-files", "-s", NULL};
int err = run_command_v_opt_cd_env(argv, RUN_GIT_CMD, ".", env);
The PWD will be unset before executing git-ls-files.
Signed-off-by: Alex Riesen <raa.lkml@xxxxxxxxx>
---
Alex Riesen, Wed, May 23, 2007 01:14:42 +0200:
> > Because you _scan_ the whole string in your patch to see if it
> > ends with = anyway, a trivial improvement would be to do:
> >
> > if (strchr(cmd->env, '='))
> > putenv(cmd->env);
> > else
> > unsetenv(cmd->env);
>
> I like this one. The env field in struct child_process and run_command
> will have to mention it in comments (in run-command.h), it's kind of
> special.
>
run-command.c | 8 ++++++--
run-command.h | 5 +++++
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/run-command.c b/run-command.c
index 605aa1e..3b1899e 100644
--- a/run-command.c
+++ b/run-command.c
@@ -77,8 +77,12 @@ int start_command(struct child_process *cmd)
die("exec %s: cd to %s failed (%s)", cmd->argv[0],
cmd->dir, strerror(errno));
if (cmd->env) {
- for (; *cmd->env; cmd->env++)
- putenv((char*)*cmd->env);
+ for (; *cmd->env; cmd->env++) {
+ if (strchr(*cmd->env, '='))
+ putenv((char*)*cmd->env);
+ else
+ unsetenv(*cmd->env);
+ }
}
if (cmd->git_cmd) {
execv_git_cmd(cmd->argv);
diff --git a/run-command.h b/run-command.h
index af1e0bf..7958eb1 100644
--- a/run-command.h
+++ b/run-command.h
@@ -35,6 +35,11 @@ int run_command(struct child_process *);
#define RUN_COMMAND_STDOUT_TO_STDERR 4
int run_command_v_opt(const char **argv, int opt);
int run_command_v_opt_cd(const char **argv, int opt, const char *dir);
+
+/*
+ * env (the environment) is to be formatted like environ: "VAR=VALUE".
+ * To unset an environment variable use just "VAR".
+ */
int run_command_v_opt_cd_env(const char **argv, int opt, const char *dir, const char *const *env);
#endif
--
1.5.2.67.gbd3c2
-
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