Revision 8db1e8743c0f1ed241f6a1b8bf55b6fef07d6751 authored by Johannes Schindelin on 28 March 2024, 18:21:06 UTC, committed by Johannes Schindelin on 19 April 2024, 10:38:23 UTC
Critical security issues typically combine relatively common vulnerabilities such as case confusion in file paths with other weaknesses in order to raise the severity of the attack. One such weakness that has haunted the Git project in many a submodule-related CVE is that any hooks that are found are executed during a clone operation. Examples are the `post-checkout` and `fsmonitor` hooks. However, Git's design calls for hooks to be disabled by default, as only disabled example hooks are copied over from the templates in `<prefix>/share/git-core/templates/`. As a defense-in-depth measure, let's prevent those hooks from running. Obviously, administrators can choose to drop enabled hooks into the template directory, though, _and_ it is also possible to override `core.hooksPath`, in which case the new check needs to be disabled. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
1 parent 584de0b
progress.c
/*
* Simple text-based progress display module for GIT
*
* Copyright (c) 2007 by Nicolas Pitre <nico@fluxnic.net>
*
* This code is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#define GIT_TEST_PROGRESS_ONLY
#include "cache.h"
#include "gettext.h"
#include "progress.h"
#include "strbuf.h"
#include "trace.h"
#include "utf8.h"
#include "config.h"
#define TP_IDX_MAX 8
struct throughput {
off_t curr_total;
off_t prev_total;
uint64_t prev_ns;
unsigned int avg_bytes;
unsigned int avg_misecs;
unsigned int last_bytes[TP_IDX_MAX];
unsigned int last_misecs[TP_IDX_MAX];
unsigned int idx;
struct strbuf display;
};
struct progress {
const char *title;
uint64_t last_value;
uint64_t total;
unsigned last_percent;
unsigned delay;
unsigned sparse;
struct throughput *throughput;
uint64_t start_ns;
struct strbuf counters_sb;
int title_len;
int split;
};
static volatile sig_atomic_t progress_update;
/*
* These are only intended for testing the progress output, i.e. exclusively
* for 'test-tool progress'.
*/
int progress_testing;
uint64_t progress_test_ns = 0;
void progress_test_force_update(void)
{
progress_update = 1;
}
static void progress_interval(int signum)
{
progress_update = 1;
}
static void set_progress_signal(void)
{
struct sigaction sa;
struct itimerval v;
if (progress_testing)
return;
progress_update = 0;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = progress_interval;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGALRM, &sa, NULL);
v.it_interval.tv_sec = 1;
v.it_interval.tv_usec = 0;
v.it_value = v.it_interval;
setitimer(ITIMER_REAL, &v, NULL);
}
static void clear_progress_signal(void)
{
struct itimerval v = {{0,},};
if (progress_testing)
return;
setitimer(ITIMER_REAL, &v, NULL);
signal(SIGALRM, SIG_IGN);
progress_update = 0;
}
static int is_foreground_fd(int fd)
{
int tpgrp = tcgetpgrp(fd);
return tpgrp < 0 || tpgrp == getpgid(0);
}
static void display(struct progress *progress, uint64_t n, const char *done)
{
const char *tp;
struct strbuf *counters_sb = &progress->counters_sb;
int show_update = 0;
int last_count_len = counters_sb->len;
if (progress->delay && (!progress_update || --progress->delay))
return;
progress->last_value = n;
tp = (progress->throughput) ? progress->throughput->display.buf : "";
if (progress->total) {
unsigned percent = n * 100 / progress->total;
if (percent != progress->last_percent || progress_update) {
progress->last_percent = percent;
strbuf_reset(counters_sb);
strbuf_addf(counters_sb,
"%3u%% (%"PRIuMAX"/%"PRIuMAX")%s", percent,
(uintmax_t)n, (uintmax_t)progress->total,
tp);
show_update = 1;
}
} else if (progress_update) {
strbuf_reset(counters_sb);
strbuf_addf(counters_sb, "%"PRIuMAX"%s", (uintmax_t)n, tp);
show_update = 1;
}
if (show_update) {
if (is_foreground_fd(fileno(stderr)) || done) {
const char *eol = done ? done : "\r";
size_t clear_len = counters_sb->len < last_count_len ?
last_count_len - counters_sb->len + 1 :
0;
/* The "+ 2" accounts for the ": ". */
size_t progress_line_len = progress->title_len +
counters_sb->len + 2;
int cols = term_columns();
if (progress->split) {
fprintf(stderr, " %s%*s", counters_sb->buf,
(int) clear_len, eol);
} else if (!done && cols < progress_line_len) {
clear_len = progress->title_len + 1 < cols ?
cols - progress->title_len - 1 : 0;
fprintf(stderr, "%s:%*s\n %s%s",
progress->title, (int) clear_len, "",
counters_sb->buf, eol);
progress->split = 1;
} else {
fprintf(stderr, "%s: %s%*s", progress->title,
counters_sb->buf, (int) clear_len, eol);
}
fflush(stderr);
}
progress_update = 0;
}
}
static void throughput_string(struct strbuf *buf, uint64_t total,
unsigned int rate)
{
strbuf_reset(buf);
strbuf_addstr(buf, ", ");
strbuf_humanise_bytes(buf, total);
strbuf_addstr(buf, " | ");
strbuf_humanise_rate(buf, rate * 1024);
}
static uint64_t progress_getnanotime(struct progress *progress)
{
if (progress_testing)
return progress->start_ns + progress_test_ns;
else
return getnanotime();
}
void display_throughput(struct progress *progress, uint64_t total)
{
struct throughput *tp;
uint64_t now_ns;
unsigned int misecs, count, rate;
if (!progress)
return;
tp = progress->throughput;
now_ns = progress_getnanotime(progress);
if (!tp) {
progress->throughput = CALLOC_ARRAY(tp, 1);
tp->prev_total = tp->curr_total = total;
tp->prev_ns = now_ns;
strbuf_init(&tp->display, 0);
return;
}
tp->curr_total = total;
/* only update throughput every 0.5 s */
if (now_ns - tp->prev_ns <= 500000000)
return;
/*
* We have x = bytes and y = nanosecs. We want z = KiB/s:
*
* z = (x / 1024) / (y / 1000000000)
* z = x / y * 1000000000 / 1024
* z = x / (y * 1024 / 1000000000)
* z = x / y'
*
* To simplify things we'll keep track of misecs, or 1024th of a sec
* obtained with:
*
* y' = y * 1024 / 1000000000
* y' = y * (2^10 / 2^42) * (2^42 / 1000000000)
* y' = y / 2^32 * 4398
* y' = (y * 4398) >> 32
*/
misecs = ((now_ns - tp->prev_ns) * 4398) >> 32;
count = total - tp->prev_total;
tp->prev_total = total;
tp->prev_ns = now_ns;
tp->avg_bytes += count;
tp->avg_misecs += misecs;
rate = tp->avg_bytes / tp->avg_misecs;
tp->avg_bytes -= tp->last_bytes[tp->idx];
tp->avg_misecs -= tp->last_misecs[tp->idx];
tp->last_bytes[tp->idx] = count;
tp->last_misecs[tp->idx] = misecs;
tp->idx = (tp->idx + 1) % TP_IDX_MAX;
throughput_string(&tp->display, total, rate);
if (progress->last_value != -1 && progress_update)
display(progress, progress->last_value, NULL);
}
void display_progress(struct progress *progress, uint64_t n)
{
if (progress)
display(progress, n, NULL);
}
static struct progress *start_progress_delay(const char *title, uint64_t total,
unsigned delay, unsigned sparse)
{
struct progress *progress = xmalloc(sizeof(*progress));
progress->title = title;
progress->total = total;
progress->last_value = -1;
progress->last_percent = -1;
progress->delay = delay;
progress->sparse = sparse;
progress->throughput = NULL;
progress->start_ns = getnanotime();
strbuf_init(&progress->counters_sb, 0);
progress->title_len = utf8_strwidth(title);
progress->split = 0;
set_progress_signal();
trace2_region_enter("progress", title, the_repository);
return progress;
}
static int get_default_delay(void)
{
static int delay_in_secs = -1;
if (delay_in_secs < 0)
delay_in_secs = git_env_ulong("GIT_PROGRESS_DELAY", 2);
return delay_in_secs;
}
struct progress *start_delayed_progress(const char *title, uint64_t total)
{
return start_progress_delay(title, total, get_default_delay(), 0);
}
struct progress *start_progress(const char *title, uint64_t total)
{
return start_progress_delay(title, total, 0, 0);
}
/*
* Here "sparse" means that the caller might use some sampling criteria to
* decide when to call display_progress() rather than calling it for every
* integer value in[0 .. total). In particular, the caller might not call
* display_progress() for the last value in the range.
*
* When "sparse" is set, stop_progress() will automatically force the done
* message to show 100%.
*/
struct progress *start_sparse_progress(const char *title, uint64_t total)
{
return start_progress_delay(title, total, 0, 1);
}
struct progress *start_delayed_sparse_progress(const char *title,
uint64_t total)
{
return start_progress_delay(title, total, get_default_delay(), 1);
}
static void finish_if_sparse(struct progress *progress)
{
if (progress->sparse &&
progress->last_value != progress->total)
display_progress(progress, progress->total);
}
static void force_last_update(struct progress *progress, const char *msg)
{
char *buf;
struct throughput *tp = progress->throughput;
if (tp) {
uint64_t now_ns = progress_getnanotime(progress);
unsigned int misecs, rate;
misecs = ((now_ns - progress->start_ns) * 4398) >> 32;
rate = tp->curr_total / (misecs ? misecs : 1);
throughput_string(&tp->display, tp->curr_total, rate);
}
progress_update = 1;
buf = xstrfmt(", %s.\n", msg);
display(progress, progress->last_value, buf);
free(buf);
}
static void log_trace2(struct progress *progress)
{
trace2_data_intmax("progress", the_repository, "total_objects",
progress->total);
if (progress->throughput)
trace2_data_intmax("progress", the_repository, "total_bytes",
progress->throughput->curr_total);
trace2_region_leave("progress", progress->title, the_repository);
}
void stop_progress_msg(struct progress **p_progress, const char *msg)
{
struct progress *progress;
if (!p_progress)
BUG("don't provide NULL to stop_progress_msg");
progress = *p_progress;
if (!progress)
return;
*p_progress = NULL;
finish_if_sparse(progress);
if (progress->last_value != -1)
force_last_update(progress, msg);
log_trace2(progress);
clear_progress_signal();
strbuf_release(&progress->counters_sb);
if (progress->throughput)
strbuf_release(&progress->throughput->display);
free(progress->throughput);
free(progress);
}
![swh spinner](/static/img/swh-spinner.gif)
Computing file changes ...