Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx> writes:
> Currently, all paths in the config file are subject to tilde expansion
> for user paths while the argument to --git-dir is not expanded, and
> neither are paths in the environment such as GIT_DIR. From the user
> perspective, though, the two commands
>
> GIT_DIR=~user/foo git command
> git --git-dir=~user/foo command
>
> currently behave differently because in the first case the shell would
> perform tilde expansion, but not in the second. Also, one may argue that
> specifying '--git-dir=' is like specifying a config variable (which
> cannot exist for this purpose).
>
> Thus, make arguments to '--git-dir' undergo tilde expansion.
> ---
> So, here's a simple patch implementing tilde expansion for --git-dir. It passes
> all tests. It's done doing the expansion on the setting side.
This looks sensible, as long as there is no potential caller within
this file that wants user-path expansion and that does _not_ want to
export the result to an environment.
The helper will be usable as-is for --work-dir, which does want to
export the result to an environment. We would want --exec-path=
handle its parameter the same way, but that one has its own setenv()
elsewhere, so "expand-path-setenv()" helper would not help it very
much. The caller of git_set_argv_exec_path() needs to do the
expanding (and freeing after it makes the call) itself.
> Alternatively, one might do it on the getting side, i.e. when reading GIT_DIR,
> so that paths passed directly through the environment undergo tilde expansion
> as well. We don't do this for any environment variable yet, so I didn't go
> that far.
>
> Signed-off-by: Michael J Gruber <git@xxxxxxxxxxxxxxxxxxxx>
> ---
> git.c | 20 ++++++++++++++++++--
> 1 file changed, 18 insertions(+), 2 deletions(-)
>
> diff --git a/git.c b/git.c
> index 8788b32..35e8011 100644
> --- a/git.c
> +++ b/git.c
> @@ -64,6 +64,22 @@ static void commit_pager_choice(void) {
> }
> }
>
> +static int expand_path_setenv(const char *name, const char *value, int overwrite)
> +{
> + int ret;
> + const char *expanded;
> +
> + if (!value)
> + return setenv(name, value, overwrite);
> +
> + expanded = expand_user_path(value);
> + if (!expanded)
> + die("Failed to expand user dir in: '%s'", value);
This should say where the 'value' came from (e.g. "--git-dir=" on
the command line).
> + ret = setenv(name, expanded, overwrite);
> + free((void *)expanded);
> + return ret;
> +}
> +
> static int handle_options(const char ***argv, int *argc, int *envchanged)
> {
> const char **orig_argv = *argv;
> @@ -117,13 +133,13 @@ static int handle_options(const char ***argv, int *argc, int *envchanged)
> fprintf(stderr, "No directory given for --git-dir.\n" );
> usage(git_usage_string);
> }
> - setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
> + expand_path_setenv(GIT_DIR_ENVIRONMENT, (*argv)[1], 1);
> if (envchanged)
> *envchanged = 1;
> (*argv)++;
> (*argc)--;
> } else if (!prefixcmp(cmd, "--git-dir=")) {
> - setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
> + expand_path_setenv(GIT_DIR_ENVIRONMENT, cmd + 10, 1);
> if (envchanged)
> *envchanged = 1;
> } else if (!strcmp(cmd, "--namespace")) {
--
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