mirror of
https://github.com/git/git
synced 2024-11-05 18:59:29 +00:00
0e5bba53af
It's a common pattern in git commands to allocate some
memory that should last for the lifetime of the program and
then not bother to free it, relying on the OS to throw it
away.
This keeps the code simple, and it's fast (we don't waste
time traversing structures or calling free at the end of the
program). But it also triggers warnings from memory-leak
checkers like valgrind or LSAN. They know that the memory
was still allocated at program exit, but they don't know
_when_ the leaked memory stopped being useful. If it was
early in the program, then it's probably a real and
important leak. But if it was used right up until program
exit, it's not an interesting leak and we'd like to suppress
it so that we can see the real leaks.
This patch introduces an UNLEAK() macro that lets us do so.
To understand its design, let's first look at some of the
alternatives.
Unfortunately the suppression systems offered by
leak-checking tools don't quite do what we want. A
leak-checker basically knows two things:
1. Which blocks were allocated via malloc, and the
callstack during the allocation.
2. Which blocks were left un-freed at the end of the
program (and which are unreachable, but more on that
later).
Their suppressions work by mentioning the function or
callstack of a particular allocation, and marking it as OK
to leak. So imagine you have code like this:
int cmd_foo(...)
{
/* this allocates some memory */
char *p = some_function();
printf("%s", p);
return 0;
}
You can say "ignore allocations from some_function(),
they're not leaks". But that's not right. That function may
be called elsewhere, too, and we would potentially want to
know about those leaks.
So you can say "ignore the callstack when main calls
some_function". That works, but your annotations are
brittle. In this case it's only two functions, but you can
imagine that the actual allocation is much deeper. If any of
the intermediate code changes, you have to update the
suppression.
What we _really_ want to say is that "the value assigned to
p at the end of the function is not a real leak". But
leak-checkers can't understand that; they don't know about
"p" in the first place.
However, we can do something a little bit tricky if we make
some assumptions about how leak-checkers work. They
generally don't just report all un-freed blocks. That would
report even globals which are still accessible when the
leak-check is run. Instead they take some set of memory
(like BSS) as a root and mark it as "reachable". Then they
scan the reachable blocks for anything that looks like a
pointer to a malloc'd block, and consider that block
reachable. And then they scan those blocks, and so on,
transitively marking anything reachable from a global as
"not leaked" (or at least leaked in a different category).
So we can mark the value of "p" as reachable by putting it
into a variable with program lifetime. One way to do that is
to just mark "p" as static. But that actually affects the
run-time behavior if the function is called twice (you
aren't likely to call main() twice, but some of our cmd_*()
functions are called from other commands).
Instead, we can trick the leak-checker by putting the value
into _any_ reachable bytes. This patch keeps a global
linked-list of bytes copied from "unleaked" variables. That
list is reachable even at program exit, which confers
recursive reachability on whatever values we unleak.
In other words, you can do:
int cmd_foo(...)
{
char *p = some_function();
printf("%s", p);
UNLEAK(p);
return 0;
}
to annotate "p" and suppress the leak report.
But wait, couldn't we just say "free(p)"? In this toy
example, yes. But UNLEAK()'s byte-copying strategy has
several advantages over actually freeing the memory:
1. It's recursive across structures. In many cases our "p"
is not just a pointer, but a complex struct whose
fields may have been allocated by a sub-function. And
in some cases (e.g., dir_struct) we don't even have a
function which knows how to free all of the struct
members.
By marking the struct itself as reachable, that confers
reachability on any pointers it contains (including those
found in embedded structs, or reachable by walking
heap blocks recursively.
2. It works on cases where we're not sure if the value is
allocated or not. For example:
char *p = argc > 1 ? argv[1] : some_function();
It's safe to use UNLEAK(p) here, because it's not
freeing any memory. In the case that we're pointing to
argv here, the reachability checker will just ignore
our bytes.
3. Likewise, it works even if the variable has _already_
been freed. We're just copying the pointer bytes. If
the block has been freed, the leak-checker will skip
over those bytes as uninteresting.
4. Because it's not actually freeing memory, you can
UNLEAK() before we are finished accessing the variable.
This is helpful in cases like this:
char *p = some_function();
return another_function(p);
Writing this with free() requires:
int ret;
char *p = some_function();
ret = another_function(p);
free(p);
return ret;
But with unleak we can just write:
char *p = some_function();
UNLEAK(p);
return another_function(p);
This patch adds the UNLEAK() macro and enables it
automatically when Git is compiled with SANITIZE=leak. In
normal builds it's a noop, so we pay no runtime cost.
It also adds some UNLEAK() annotations to show off how the
feature works. On top of other recent leak fixes, these are
enough to get t0000 and t0001 to pass when compiled with
LSAN.
Note the case in commit.c which actually converts a
strbuf_release() into an UNLEAK. This code was already
non-leaky, but the free didn't do anything useful, since
we're exiting. Converting it to an annotation means that
non-leak-checking builds pay no runtime cost. The cost is
minimal enough that it's probably not worth going on a
crusade to convert these kinds of frees to UNLEAKS. I did it
here for consistency with the "sb" leak (though it would
have been equally correct to go the other way, and turn them
both into strbuf_release() calls).
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
521 lines
14 KiB
C
521 lines
14 KiB
C
/*
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* "git add" builtin command
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*
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* Copyright (C) 2006 Linus Torvalds
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*/
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#include "cache.h"
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#include "config.h"
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#include "builtin.h"
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#include "lockfile.h"
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#include "dir.h"
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#include "pathspec.h"
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#include "exec_cmd.h"
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#include "cache-tree.h"
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#include "run-command.h"
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#include "parse-options.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "revision.h"
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#include "bulk-checkin.h"
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#include "argv-array.h"
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#include "submodule.h"
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static const char * const builtin_add_usage[] = {
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N_("git add [<options>] [--] <pathspec>..."),
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NULL
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};
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static int patch_interactive, add_interactive, edit_interactive;
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static int take_worktree_changes;
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struct update_callback_data {
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int flags;
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int add_errors;
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};
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static void chmod_pathspec(struct pathspec *pathspec, char flip)
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{
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int i;
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for (i = 0; i < active_nr; i++) {
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struct cache_entry *ce = active_cache[i];
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if (pathspec && !ce_path_match(ce, pathspec, NULL))
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continue;
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if (chmod_cache_entry(ce, flip) < 0)
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fprintf(stderr, "cannot chmod %cx '%s'\n", flip, ce->name);
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}
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}
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static int fix_unmerged_status(struct diff_filepair *p,
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struct update_callback_data *data)
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{
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if (p->status != DIFF_STATUS_UNMERGED)
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return p->status;
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if (!(data->flags & ADD_CACHE_IGNORE_REMOVAL) && !p->two->mode)
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/*
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* This is not an explicit add request, and the
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* path is missing from the working tree (deleted)
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*/
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return DIFF_STATUS_DELETED;
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else
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/*
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* Either an explicit add request, or path exists
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* in the working tree. An attempt to explicitly
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* add a path that does not exist in the working tree
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* will be caught as an error by the caller immediately.
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*/
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return DIFF_STATUS_MODIFIED;
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}
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static void update_callback(struct diff_queue_struct *q,
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struct diff_options *opt, void *cbdata)
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{
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int i;
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struct update_callback_data *data = cbdata;
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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const char *path = p->one->path;
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switch (fix_unmerged_status(p, data)) {
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default:
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die(_("unexpected diff status %c"), p->status);
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case DIFF_STATUS_MODIFIED:
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case DIFF_STATUS_TYPE_CHANGED:
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if (add_file_to_index(&the_index, path, data->flags)) {
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if (!(data->flags & ADD_CACHE_IGNORE_ERRORS))
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die(_("updating files failed"));
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data->add_errors++;
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}
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break;
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case DIFF_STATUS_DELETED:
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if (data->flags & ADD_CACHE_IGNORE_REMOVAL)
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break;
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if (!(data->flags & ADD_CACHE_PRETEND))
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remove_file_from_index(&the_index, path);
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if (data->flags & (ADD_CACHE_PRETEND|ADD_CACHE_VERBOSE))
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printf(_("remove '%s'\n"), path);
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break;
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}
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}
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}
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int add_files_to_cache(const char *prefix,
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const struct pathspec *pathspec, int flags)
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{
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struct update_callback_data data;
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struct rev_info rev;
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memset(&data, 0, sizeof(data));
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data.flags = flags;
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init_revisions(&rev, prefix);
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setup_revisions(0, NULL, &rev, NULL);
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if (pathspec)
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copy_pathspec(&rev.prune_data, pathspec);
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rev.diffopt.output_format = DIFF_FORMAT_CALLBACK;
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rev.diffopt.format_callback = update_callback;
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rev.diffopt.format_callback_data = &data;
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rev.diffopt.flags |= DIFF_OPT_OVERRIDE_SUBMODULE_CONFIG;
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rev.max_count = 0; /* do not compare unmerged paths with stage #2 */
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run_diff_files(&rev, DIFF_RACY_IS_MODIFIED);
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clear_pathspec(&rev.prune_data);
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return !!data.add_errors;
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}
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static char *prune_directory(struct dir_struct *dir, struct pathspec *pathspec, int prefix)
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{
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char *seen;
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int i;
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struct dir_entry **src, **dst;
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seen = xcalloc(pathspec->nr, 1);
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src = dst = dir->entries;
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i = dir->nr;
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while (--i >= 0) {
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struct dir_entry *entry = *src++;
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if (dir_path_match(entry, pathspec, prefix, seen))
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*dst++ = entry;
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}
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dir->nr = dst - dir->entries;
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add_pathspec_matches_against_index(pathspec, &the_index, seen);
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return seen;
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}
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static void refresh(int verbose, const struct pathspec *pathspec)
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{
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char *seen;
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int i;
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seen = xcalloc(pathspec->nr, 1);
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refresh_index(&the_index, verbose ? REFRESH_IN_PORCELAIN : REFRESH_QUIET,
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pathspec, seen, _("Unstaged changes after refreshing the index:"));
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for (i = 0; i < pathspec->nr; i++) {
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if (!seen[i])
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die(_("pathspec '%s' did not match any files"),
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pathspec->items[i].match);
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}
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free(seen);
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}
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int run_add_interactive(const char *revision, const char *patch_mode,
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const struct pathspec *pathspec)
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{
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int status, i;
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struct argv_array argv = ARGV_ARRAY_INIT;
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argv_array_push(&argv, "add--interactive");
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if (patch_mode)
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argv_array_push(&argv, patch_mode);
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if (revision)
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argv_array_push(&argv, revision);
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argv_array_push(&argv, "--");
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for (i = 0; i < pathspec->nr; i++)
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/* pass original pathspec, to be re-parsed */
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argv_array_push(&argv, pathspec->items[i].original);
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status = run_command_v_opt(argv.argv, RUN_GIT_CMD);
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argv_array_clear(&argv);
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return status;
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}
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int interactive_add(int argc, const char **argv, const char *prefix, int patch)
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{
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struct pathspec pathspec;
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parse_pathspec(&pathspec, 0,
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PATHSPEC_PREFER_FULL |
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PATHSPEC_SYMLINK_LEADING_PATH |
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PATHSPEC_PREFIX_ORIGIN,
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prefix, argv);
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return run_add_interactive(NULL,
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patch ? "--patch" : NULL,
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&pathspec);
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}
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static int edit_patch(int argc, const char **argv, const char *prefix)
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{
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char *file = git_pathdup("ADD_EDIT.patch");
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const char *apply_argv[] = { "apply", "--recount", "--cached",
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NULL, NULL };
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struct child_process child = CHILD_PROCESS_INIT;
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struct rev_info rev;
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int out;
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struct stat st;
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apply_argv[3] = file;
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git_config(git_diff_basic_config, NULL); /* no "diff" UI options */
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if (read_cache() < 0)
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die(_("Could not read the index"));
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init_revisions(&rev, prefix);
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rev.diffopt.context = 7;
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argc = setup_revisions(argc, argv, &rev, NULL);
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rev.diffopt.output_format = DIFF_FORMAT_PATCH;
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rev.diffopt.use_color = 0;
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DIFF_OPT_SET(&rev.diffopt, IGNORE_DIRTY_SUBMODULES);
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out = open(file, O_CREAT | O_WRONLY, 0666);
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if (out < 0)
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die(_("Could not open '%s' for writing."), file);
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rev.diffopt.file = xfdopen(out, "w");
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rev.diffopt.close_file = 1;
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if (run_diff_files(&rev, 0))
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die(_("Could not write patch"));
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if (launch_editor(file, NULL, NULL))
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die(_("editing patch failed"));
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if (stat(file, &st))
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die_errno(_("Could not stat '%s'"), file);
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if (!st.st_size)
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die(_("Empty patch. Aborted."));
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child.git_cmd = 1;
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child.argv = apply_argv;
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if (run_command(&child))
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die(_("Could not apply '%s'"), file);
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unlink(file);
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free(file);
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return 0;
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}
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static struct lock_file lock_file;
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static const char ignore_error[] =
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N_("The following paths are ignored by one of your .gitignore files:\n");
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static int verbose, show_only, ignored_too, refresh_only;
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static int ignore_add_errors, intent_to_add, ignore_missing;
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static int warn_on_embedded_repo = 1;
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#define ADDREMOVE_DEFAULT 1
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static int addremove = ADDREMOVE_DEFAULT;
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static int addremove_explicit = -1; /* unspecified */
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static char *chmod_arg;
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static int ignore_removal_cb(const struct option *opt, const char *arg, int unset)
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{
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/* if we are told to ignore, we are not adding removals */
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*(int *)opt->value = !unset ? 0 : 1;
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return 0;
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}
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static struct option builtin_add_options[] = {
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OPT__DRY_RUN(&show_only, N_("dry run")),
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OPT__VERBOSE(&verbose, N_("be verbose")),
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OPT_GROUP(""),
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OPT_BOOL('i', "interactive", &add_interactive, N_("interactive picking")),
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OPT_BOOL('p', "patch", &patch_interactive, N_("select hunks interactively")),
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OPT_BOOL('e', "edit", &edit_interactive, N_("edit current diff and apply")),
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OPT__FORCE(&ignored_too, N_("allow adding otherwise ignored files")),
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OPT_BOOL('u', "update", &take_worktree_changes, N_("update tracked files")),
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OPT_BOOL('N', "intent-to-add", &intent_to_add, N_("record only the fact that the path will be added later")),
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OPT_BOOL('A', "all", &addremove_explicit, N_("add changes from all tracked and untracked files")),
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{ OPTION_CALLBACK, 0, "ignore-removal", &addremove_explicit,
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NULL /* takes no arguments */,
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N_("ignore paths removed in the working tree (same as --no-all)"),
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PARSE_OPT_NOARG, ignore_removal_cb },
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OPT_BOOL( 0 , "refresh", &refresh_only, N_("don't add, only refresh the index")),
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OPT_BOOL( 0 , "ignore-errors", &ignore_add_errors, N_("just skip files which cannot be added because of errors")),
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OPT_BOOL( 0 , "ignore-missing", &ignore_missing, N_("check if - even missing - files are ignored in dry run")),
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OPT_STRING( 0 , "chmod", &chmod_arg, N_("(+/-)x"), N_("override the executable bit of the listed files")),
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OPT_HIDDEN_BOOL(0, "warn-embedded-repo", &warn_on_embedded_repo,
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N_("warn when adding an embedded repository")),
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OPT_END(),
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};
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static int add_config(const char *var, const char *value, void *cb)
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{
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if (!strcmp(var, "add.ignoreerrors") ||
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!strcmp(var, "add.ignore-errors")) {
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ignore_add_errors = git_config_bool(var, value);
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return 0;
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}
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return git_default_config(var, value, cb);
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}
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static const char embedded_advice[] = N_(
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"You've added another git repository inside your current repository.\n"
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"Clones of the outer repository will not contain the contents of\n"
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"the embedded repository and will not know how to obtain it.\n"
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"If you meant to add a submodule, use:\n"
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"\n"
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" git submodule add <url> %s\n"
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"\n"
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"If you added this path by mistake, you can remove it from the\n"
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"index with:\n"
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"\n"
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" git rm --cached %s\n"
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"\n"
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"See \"git help submodule\" for more information."
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);
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static void check_embedded_repo(const char *path)
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{
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struct strbuf name = STRBUF_INIT;
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if (!warn_on_embedded_repo)
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return;
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if (!ends_with(path, "/"))
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return;
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/* Drop trailing slash for aesthetics */
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strbuf_addstr(&name, path);
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strbuf_strip_suffix(&name, "/");
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warning(_("adding embedded git repository: %s"), name.buf);
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if (advice_add_embedded_repo) {
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advise(embedded_advice, name.buf, name.buf);
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/* there may be multiple entries; advise only once */
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advice_add_embedded_repo = 0;
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}
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strbuf_release(&name);
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}
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static int add_files(struct dir_struct *dir, int flags)
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{
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int i, exit_status = 0;
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if (dir->ignored_nr) {
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fprintf(stderr, _(ignore_error));
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for (i = 0; i < dir->ignored_nr; i++)
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fprintf(stderr, "%s\n", dir->ignored[i]->name);
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fprintf(stderr, _("Use -f if you really want to add them.\n"));
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exit_status = 1;
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}
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for (i = 0; i < dir->nr; i++) {
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check_embedded_repo(dir->entries[i]->name);
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if (add_file_to_index(&the_index, dir->entries[i]->name, flags)) {
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if (!ignore_add_errors)
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die(_("adding files failed"));
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exit_status = 1;
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}
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}
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return exit_status;
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}
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int cmd_add(int argc, const char **argv, const char *prefix)
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{
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int exit_status = 0;
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struct pathspec pathspec;
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struct dir_struct dir;
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int flags;
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int add_new_files;
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int require_pathspec;
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char *seen = NULL;
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git_config(add_config, NULL);
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argc = parse_options(argc, argv, prefix, builtin_add_options,
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builtin_add_usage, PARSE_OPT_KEEP_ARGV0);
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if (patch_interactive)
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add_interactive = 1;
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if (add_interactive)
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exit(interactive_add(argc - 1, argv + 1, prefix, patch_interactive));
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if (edit_interactive)
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return(edit_patch(argc, argv, prefix));
|
|
argc--;
|
|
argv++;
|
|
|
|
if (0 <= addremove_explicit)
|
|
addremove = addremove_explicit;
|
|
else if (take_worktree_changes && ADDREMOVE_DEFAULT)
|
|
addremove = 0; /* "-u" was given but not "-A" */
|
|
|
|
if (addremove && take_worktree_changes)
|
|
die(_("-A and -u are mutually incompatible"));
|
|
|
|
if (!take_worktree_changes && addremove_explicit < 0 && argc)
|
|
/* Turn "git add pathspec..." to "git add -A pathspec..." */
|
|
addremove = 1;
|
|
|
|
if (!show_only && ignore_missing)
|
|
die(_("Option --ignore-missing can only be used together with --dry-run"));
|
|
|
|
if (chmod_arg && ((chmod_arg[0] != '-' && chmod_arg[0] != '+') ||
|
|
chmod_arg[1] != 'x' || chmod_arg[2]))
|
|
die(_("--chmod param '%s' must be either -x or +x"), chmod_arg);
|
|
|
|
add_new_files = !take_worktree_changes && !refresh_only;
|
|
require_pathspec = !(take_worktree_changes || (0 < addremove_explicit));
|
|
|
|
hold_locked_index(&lock_file, LOCK_DIE_ON_ERROR);
|
|
|
|
flags = ((verbose ? ADD_CACHE_VERBOSE : 0) |
|
|
(show_only ? ADD_CACHE_PRETEND : 0) |
|
|
(intent_to_add ? ADD_CACHE_INTENT : 0) |
|
|
(ignore_add_errors ? ADD_CACHE_IGNORE_ERRORS : 0) |
|
|
(!(addremove || take_worktree_changes)
|
|
? ADD_CACHE_IGNORE_REMOVAL : 0));
|
|
|
|
if (require_pathspec && argc == 0) {
|
|
fprintf(stderr, _("Nothing specified, nothing added.\n"));
|
|
fprintf(stderr, _("Maybe you wanted to say 'git add .'?\n"));
|
|
return 0;
|
|
}
|
|
|
|
if (read_cache() < 0)
|
|
die(_("index file corrupt"));
|
|
|
|
die_in_unpopulated_submodule(&the_index, prefix);
|
|
|
|
/*
|
|
* Check the "pathspec '%s' did not match any files" block
|
|
* below before enabling new magic.
|
|
*/
|
|
parse_pathspec(&pathspec, 0,
|
|
PATHSPEC_PREFER_FULL |
|
|
PATHSPEC_SYMLINK_LEADING_PATH,
|
|
prefix, argv);
|
|
|
|
die_path_inside_submodule(&the_index, &pathspec);
|
|
|
|
if (add_new_files) {
|
|
int baselen;
|
|
|
|
/* Set up the default git porcelain excludes */
|
|
memset(&dir, 0, sizeof(dir));
|
|
if (!ignored_too) {
|
|
dir.flags |= DIR_COLLECT_IGNORED;
|
|
setup_standard_excludes(&dir);
|
|
}
|
|
|
|
/* This picks up the paths that are not tracked */
|
|
baselen = fill_directory(&dir, &the_index, &pathspec);
|
|
if (pathspec.nr)
|
|
seen = prune_directory(&dir, &pathspec, baselen);
|
|
}
|
|
|
|
if (refresh_only) {
|
|
refresh(verbose, &pathspec);
|
|
goto finish;
|
|
}
|
|
|
|
if (pathspec.nr) {
|
|
int i;
|
|
|
|
if (!seen)
|
|
seen = find_pathspecs_matching_against_index(&pathspec, &the_index);
|
|
|
|
/*
|
|
* file_exists() assumes exact match
|
|
*/
|
|
GUARD_PATHSPEC(&pathspec,
|
|
PATHSPEC_FROMTOP |
|
|
PATHSPEC_LITERAL |
|
|
PATHSPEC_GLOB |
|
|
PATHSPEC_ICASE |
|
|
PATHSPEC_EXCLUDE);
|
|
|
|
for (i = 0; i < pathspec.nr; i++) {
|
|
const char *path = pathspec.items[i].match;
|
|
if (pathspec.items[i].magic & PATHSPEC_EXCLUDE)
|
|
continue;
|
|
if (!seen[i] && path[0] &&
|
|
((pathspec.items[i].magic &
|
|
(PATHSPEC_GLOB | PATHSPEC_ICASE)) ||
|
|
!file_exists(path))) {
|
|
if (ignore_missing) {
|
|
int dtype = DT_UNKNOWN;
|
|
if (is_excluded(&dir, &the_index, path, &dtype))
|
|
dir_add_ignored(&dir, &the_index,
|
|
path, pathspec.items[i].len);
|
|
} else
|
|
die(_("pathspec '%s' did not match any files"),
|
|
pathspec.items[i].original);
|
|
}
|
|
}
|
|
free(seen);
|
|
}
|
|
|
|
plug_bulk_checkin();
|
|
|
|
exit_status |= add_files_to_cache(prefix, &pathspec, flags);
|
|
|
|
if (add_new_files)
|
|
exit_status |= add_files(&dir, flags);
|
|
|
|
if (chmod_arg && pathspec.nr)
|
|
chmod_pathspec(&pathspec, chmod_arg[0]);
|
|
unplug_bulk_checkin();
|
|
|
|
finish:
|
|
if (active_cache_changed) {
|
|
if (write_locked_index(&the_index, &lock_file, COMMIT_LOCK))
|
|
die(_("Unable to write new index file"));
|
|
}
|
|
|
|
UNLEAK(pathspec);
|
|
UNLEAK(dir);
|
|
return exit_status;
|
|
}
|