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/*
* download.c - source file downloader
* https://rawnix.org
*
* Copyright (c) 2025 zorz@gmx.com
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "mkpkg.h"
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/wait.h>
static int is_url(const char *s)
{
return str_starts_with(s, "http://") ||
str_starts_with(s, "https://") ||
str_starts_with(s, "ftp://");
}
static const char *url_basename(const char *url)
{
const char *slash = strrchr(url, '/');
return (slash && slash[1]) ? slash + 1 : "download";
}
static void format_bytes(char *buf, size_t bufsz, long long bytes)
{
if (bytes >= (long long)1024 * 1024 * 1024)
snprintf(buf, bufsz, "%.2f GB",
(double)bytes / (1024.0 * 1024.0 * 1024.0));
else if (bytes >= 1024 * 1024)
snprintf(buf, bufsz, "%.2f MB",
(double)bytes / (1024.0 * 1024.0));
else if (bytes >= 1024)
snprintf(buf, bufsz, "%.1f KB", (double)bytes / 1024.0);
else
snprintf(buf, bufsz, "%lld B", bytes);
}
/* ── per-download job ────────────────────────────────────────────────── */
typedef struct {
pid_t pid;
char dest[PATH_MAX_LEN];
char url[PATH_MAX_LEN];
int done;
int status;
} job_t;
/*
* Spawn wget for a single download.
* stdout and stderr are silenced — mkpkg owns all terminal output.
*/
static pid_t spawn_wget(const char *url, const char *dest)
{
pid_t pid = fork();
if (pid < 0)
err(E_DOWNLOAD, "fork");
if (pid == 0) {
int devnull = open("/dev/null", O_WRONLY);
if (devnull >= 0) {
dup2(devnull, STDOUT_FILENO);
dup2(devnull, STDERR_FILENO);
close(devnull);
}
execlp("wget", "wget",
"--quiet",
"-O", dest,
url,
(char *)NULL);
_exit(E_DOWNLOAD);
}
return pid;
}
/*
* Poll all jobs with WNOHANG, print a spinner + total bytes progress.
* Returns number of failed downloads.
*/
static int wait_with_progress(job_t *jobs, int njobs)
{
static const char *spin[] = {
"⠋","⠙","⠹","⠸","⠼","⠴","⠦","⠧","⠇","⠏"
};
int remaining = njobs;
int failed = 0;
int spin_idx = 0;
while (remaining > 0) {
int i;
for (i = 0; i < njobs; i++) {
int st;
if (jobs[i].done) continue;
if (waitpid(jobs[i].pid, &st, WNOHANG) == jobs[i].pid) {
jobs[i].done = 1;
jobs[i].status = st;
remaining--;
if (!WIFEXITED(st) || WEXITSTATUS(st) != 0) {
failed++;
unlink(jobs[i].dest);
}
}
}
{
long long total = 0;
int active = 0;
struct stat st;
for (i = 0; i < njobs; i++) {
if (stat(jobs[i].dest, &st) == 0) {
total += st.st_size;
if (!jobs[i].done) active++;
}
}
char bytes_str[32];
format_bytes(bytes_str, sizeof(bytes_str), total);
fprintf(stderr, "\r %s %s (%d/%d active) ",
spin[spin_idx % 10], bytes_str, active, njobs);
fflush(stderr);
spin_idx++;
}
if (remaining > 0) {
struct timespec ts = { 0, 250000000L }; /* 250 ms */
nanosleep(&ts, NULL);
}
}
fprintf(stderr, "\r%60s\r", "");
fflush(stderr);
return failed;
}
/* ── download_sources ────────────────────────────────────────────────── */
int download_sources(pkgfile_t *pkgfile, config_t *config)
{
/* heap-allocated job array — avoids ~2 MB stack frame */
job_t *jobs = xmalloc(MAX_SOURCES * sizeof(job_t));
int njobs = 0;
int i, failed;
for (i = 0; i < pkgfile->source_count; i++) {
source_t *src = &pkgfile->sources[i];
const char *url = src->url;
char dest[PATH_MAX_LEN];
if (src->rename && strcmp(src->rename, "SKIP") == 0)
continue;
if (!is_url(url)) {
/* local file — verify it exists */
char local[PATH_MAX_LEN];
snprintf(local, sizeof(local), "%s/%s",
config->root_dir, url);
if (access(local, F_OK) != 0)
errx(E_DOWNLOAD, "source not found: %s", url);
continue;
}
/* determine destination filename */
if (src->rename && src->rename[0]) {
snprintf(dest, sizeof(dest), "%s/%s",
config->source_dir, src->rename);
} else {
snprintf(dest, sizeof(dest), "%s/%s",
config->source_dir, url_basename(url));
}
if (access(dest, F_OK) == 0) {
info("already exists: %s", dest);
continue;
}
info("downloading %s", url);
jobs[njobs].done = 0;
jobs[njobs].status = 0;
jobs[njobs].pid = spawn_wget(url, dest);
snprintf(jobs[njobs].dest, sizeof(jobs[njobs].dest), "%s", dest);
snprintf(jobs[njobs].url, sizeof(jobs[njobs].url), "%s", url);
njobs++;
}
if (njobs == 0) {
free(jobs);
return 0;
}
failed = wait_with_progress(jobs, njobs);
for (i = 0; i < njobs; i++) {
if (jobs[i].done &&
(!WIFEXITED(jobs[i].status) ||
WEXITSTATUS(jobs[i].status) != 0))
warning("download failed: %s", jobs[i].url);
}
free(jobs);
if (failed)
errx(E_DOWNLOAD, "%d download(s) failed", failed);
info("downloaded %d file%s", njobs, njobs == 1 ? "" : "s");
return 0;
}
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