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git/builtin-rm.c
Nguyễn Thái Ngọc Duy 4e1a7baa2e rm: only refresh entries that we may touch
This gets rid of the whole tree cache refresh. Instead only path that
we touch will get refreshed. We may still lstat() more than needed,
but it'd be better playing safe.

This potentially reduces a large number of lstat() on big trees. Take
gentoo-x86 tree for example, which has roughly 80k files:

Unmodified Git:

$ time git rm --cached skel.ebuild
rm 'skel.ebuild'

real    0m1.441s
user    0m0.821s
sys     0m0.531s

Modified Git:

$ time ~/w/git/git rm --cached skel.ebuild
rm 'skel.ebuild'

real    0m0.941s
user    0m0.828s
sys     0m0.091s

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-19 15:04:23 -08:00

272 lines
7 KiB
C

/*
* "git rm" builtin command
*
* Copyright (C) Linus Torvalds 2006
*/
#include "cache.h"
#include "builtin.h"
#include "dir.h"
#include "cache-tree.h"
#include "tree-walk.h"
#include "parse-options.h"
static const char * const builtin_rm_usage[] = {
"git rm [options] [--] <file>...",
NULL
};
static struct {
int nr, alloc;
const char **name;
} list;
static void add_list(const char *name)
{
if (list.nr >= list.alloc) {
list.alloc = alloc_nr(list.alloc);
list.name = xrealloc(list.name, list.alloc * sizeof(const char *));
}
list.name[list.nr++] = name;
}
static int check_local_mod(unsigned char *head, int index_only)
{
/*
* Items in list are already sorted in the cache order,
* so we could do this a lot more efficiently by using
* tree_desc based traversal if we wanted to, but I am
* lazy, and who cares if removal of files is a tad
* slower than the theoretical maximum speed?
*/
int i, no_head;
int errs = 0;
no_head = is_null_sha1(head);
for (i = 0; i < list.nr; i++) {
struct stat st;
int pos;
struct cache_entry *ce;
const char *name = list.name[i];
unsigned char sha1[20];
unsigned mode;
int local_changes = 0;
int staged_changes = 0;
pos = cache_name_pos(name, strlen(name));
if (pos < 0)
continue; /* removing unmerged entry */
ce = active_cache[pos];
if (lstat(ce->name, &st) < 0) {
if (errno != ENOENT)
warning("'%s': %s", ce->name, strerror(errno));
/* It already vanished from the working tree */
continue;
}
else if (S_ISDIR(st.st_mode)) {
/* if a file was removed and it is now a
* directory, that is the same as ENOENT as
* far as git is concerned; we do not track
* directories.
*/
continue;
}
/*
* "rm" of a path that has changes need to be treated
* carefully not to allow losing local changes
* accidentally. A local change could be (1) file in
* work tree is different since the index; and/or (2)
* the user staged a content that is different from
* the current commit in the index.
*
* In such a case, you would need to --force the
* removal. However, "rm --cached" (remove only from
* the index) is safe if the index matches the file in
* the work tree or the HEAD commit, as it means that
* the content being removed is available elsewhere.
*/
/*
* Is the index different from the file in the work tree?
*/
if (ce_match_stat(ce, &st, 0))
local_changes = 1;
/*
* Is the index different from the HEAD commit? By
* definition, before the very initial commit,
* anything staged in the index is treated by the same
* way as changed from the HEAD.
*/
if (no_head
|| get_tree_entry(head, name, sha1, &mode)
|| ce->ce_mode != create_ce_mode(mode)
|| hashcmp(ce->sha1, sha1))
staged_changes = 1;
/*
* If the index does not match the file in the work
* tree and if it does not match the HEAD commit
* either, (1) "git rm" without --cached definitely
* will lose information; (2) "git rm --cached" will
* lose information unless it is about removing an
* "intent to add" entry.
*/
if (local_changes && staged_changes) {
if (!index_only || !(ce->ce_flags & CE_INTENT_TO_ADD))
errs = error("'%s' has staged content different "
"from both the file and the HEAD\n"
"(use -f to force removal)", name);
}
else if (!index_only) {
if (staged_changes)
errs = error("'%s' has changes staged in the index\n"
"(use --cached to keep the file, "
"or -f to force removal)", name);
if (local_changes)
errs = error("'%s' has local modifications\n"
"(use --cached to keep the file, "
"or -f to force removal)", name);
}
}
return errs;
}
static struct lock_file lock_file;
static int show_only = 0, force = 0, index_only = 0, recursive = 0, quiet = 0;
static int ignore_unmatch = 0;
static struct option builtin_rm_options[] = {
OPT__DRY_RUN(&show_only),
OPT__QUIET(&quiet),
OPT_BOOLEAN( 0 , "cached", &index_only, "only remove from the index"),
OPT_BOOLEAN('f', "force", &force, "override the up-to-date check"),
OPT_BOOLEAN('r', NULL, &recursive, "allow recursive removal"),
OPT_BOOLEAN( 0 , "ignore-unmatch", &ignore_unmatch,
"exit with a zero status even if nothing matched"),
OPT_END(),
};
int cmd_rm(int argc, const char **argv, const char *prefix)
{
int i, newfd;
const char **pathspec;
char *seen;
git_config(git_default_config, NULL);
argc = parse_options(argc, argv, prefix, builtin_rm_options,
builtin_rm_usage, 0);
if (!argc)
usage_with_options(builtin_rm_usage, builtin_rm_options);
if (!index_only)
setup_work_tree();
newfd = hold_locked_index(&lock_file, 1);
if (read_cache() < 0)
die("index file corrupt");
pathspec = get_pathspec(prefix, argv);
refresh_index(&the_index, REFRESH_QUIET, pathspec, NULL, NULL);
seen = NULL;
for (i = 0; pathspec[i] ; i++)
/* nothing */;
seen = xcalloc(i, 1);
for (i = 0; i < active_nr; i++) {
struct cache_entry *ce = active_cache[i];
if (!match_pathspec(pathspec, ce->name, ce_namelen(ce), 0, seen))
continue;
add_list(ce->name);
}
if (pathspec) {
const char *match;
int seen_any = 0;
for (i = 0; (match = pathspec[i]) != NULL ; i++) {
if (!seen[i]) {
if (!ignore_unmatch) {
die("pathspec '%s' did not match any files",
match);
}
}
else {
seen_any = 1;
}
if (!recursive && seen[i] == MATCHED_RECURSIVELY)
die("not removing '%s' recursively without -r",
*match ? match : ".");
}
if (! seen_any)
exit(0);
}
/*
* If not forced, the file, the index and the HEAD (if exists)
* must match; but the file can already been removed, since
* this sequence is a natural "novice" way:
*
* rm F; git rm F
*
* Further, if HEAD commit exists, "diff-index --cached" must
* report no changes unless forced.
*/
if (!force) {
unsigned char sha1[20];
if (get_sha1("HEAD", sha1))
hashclr(sha1);
if (check_local_mod(sha1, index_only))
exit(1);
}
/*
* First remove the names from the index: we won't commit
* the index unless all of them succeed.
*/
for (i = 0; i < list.nr; i++) {
const char *path = list.name[i];
if (!quiet)
printf("rm '%s'\n", path);
if (remove_file_from_cache(path))
die("git rm: unable to remove %s", path);
}
if (show_only)
return 0;
/*
* Then, unless we used "--cached", remove the filenames from
* the workspace. If we fail to remove the first one, we
* abort the "git rm" (but once we've successfully removed
* any file at all, we'll go ahead and commit to it all:
* by then we've already committed ourselves and can't fail
* in the middle)
*/
if (!index_only) {
int removed = 0;
for (i = 0; i < list.nr; i++) {
const char *path = list.name[i];
if (!remove_path(path)) {
removed = 1;
continue;
}
if (!removed)
die_errno("git rm: '%s'", path);
}
}
if (active_cache_changed) {
if (write_cache(newfd, active_cache, active_nr) ||
commit_locked_index(&lock_file))
die("Unable to write new index file");
}
return 0;
}