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#include "cache.h"
#include "commit.h"
#include "diff.h"
#include "revision.h"
#include "builtin.h"
#include "reachable.h"
#include "parse-options.h"
#include "progress.h"
#include "dir.h"

static const char * const prune_usage[] = {
N_("git prune [-n] [-v] [--expire <time>] [--] [<head>...]"),
NULL
};
static int show_only;
static int verbose;
static unsigned long expire;
static int show_progress = -1;

static int prune_tmp_object(const char *path, const char *filename)
{
const char *fullpath = mkpath("%s/%s", path, filename);
struct stat st;
if (lstat(fullpath, &st))
return error("Could not stat '%s'", fullpath);
if (st.st_mtime > expire)
return 0;
if (show_only || verbose)
printf("Removing stale temporary file %s\n", fullpath);
if (!show_only)
unlink_or_warn(fullpath);
return 0;
}

static int prune_object(char *path, const char *filename, const unsigned char *sha1)
{
const char *fullpath = mkpath("%s/%s", path, filename);
struct stat st;
if (lstat(fullpath, &st))
return error("Could not stat '%s'", fullpath);
if (st.st_mtime > expire)
return 0;
if (show_only || verbose) {
enum object_type type = sha1_object_info(sha1, NULL);
printf("%s %s\n", sha1_to_hex(sha1),
(type > 0) ? typename(type) : "unknown");
}
if (!show_only)
unlink_or_warn(fullpath);
return 0;
}

static int prune_dir(int i, char *path)
{
DIR *dir = opendir(path);
struct dirent *de;

if (!dir)
return 0;

while ((de = readdir(dir)) != NULL) {
char name[100];
unsigned char sha1[20];

if (is_dot_or_dotdot(de->d_name))
continue;
if (strlen(de->d_name) == 38) {
sprintf(name, "%02x", i);
memcpy(name+2, de->d_name, 39);
if (get_sha1_hex(name, sha1) < 0)
break;

/*
* Do we know about this object?
* It must have been reachable
*/
if (lookup_object(sha1))
continue;

prune_object(path, de->d_name, sha1);
continue;
}
if (!prefixcmp(de->d_name, "tmp_obj_")) {
prune_tmp_object(path, de->d_name);
continue;
}
fprintf(stderr, "bad sha1 file: %s/%s\n", path, de->d_name);
}
closedir(dir);
if (!show_only)
rmdir(path);
return 0;
}

static void prune_object_dir(const char *path)
{
int i;
for (i = 0; i < 256; i++) {
static char dir[4096];
sprintf(dir, "%s/%02x", path, i);
prune_dir(i, dir);
}
}

/*
* Write errors (particularly out of space) can result in
* failed temporary packs (and more rarely indexes and other
* files beginning with "tmp_") accumulating in the object
* and the pack directories.
*/
static void remove_temporary_files(const char *path)
{
DIR *dir;
struct dirent *de;

dir = opendir(path);
if (!dir) {
fprintf(stderr, "Unable to open directory %s\n", path);
return;
}
while ((de = readdir(dir)) != NULL)
if (!prefixcmp(de->d_name, "tmp_"))
prune_tmp_object(path, de->d_name);
closedir(dir);
}

int cmd_prune(int argc, const char **argv, const char *prefix)
{
struct rev_info revs;
struct progress *progress = NULL;
const struct option options[] = {
OPT__DRY_RUN(&show_only, N_("do not remove, show only")),
OPT__VERBOSE(&verbose, N_("report pruned objects")),
OPT_BOOL(0, "progress", &show_progress, N_("show progress")),
OPT_DATE(0, "expire", &expire,
N_("expire objects older than <time>")),
OPT_END()
};
char *s;

expire = ULONG_MAX;
save_commit_buffer = 0;
read_replace_refs = 0;
init_revisions(&revs, prefix);

argc = parse_options(argc, argv, prefix, options, prune_usage, 0);
while (argc--) {
unsigned char sha1[20];
const char *name = *argv++;

if (!get_sha1(name, sha1)) {
struct object *object = parse_object(sha1);
if (!object)
die("bad object: %s", name);
add_pending_object(&revs, object, "");
}
else
die("unrecognized argument: %s", name);
}

if (show_progress == -1)
show_progress = isatty(2);
if (show_progress)
progress = start_progress_delay("Checking connectivity", 0, 0, 2);

mark_reachable_objects(&revs, 1, progress);
stop_progress(&progress);
prune_object_dir(get_object_directory());

prune_packed_objects(show_only);
remove_temporary_files(get_object_directory());
s = mkpathdup("%s/pack", get_object_directory());
remove_temporary_files(s);
free(s);
return 0;
}
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