progress: barra di avanzamento per download ed estrazione

Aggiunge src/progress.{c,h}: barra a una riga attiva solo quando stdout e' un
terminale (con output rediretto/pipeline non stampa nulla, quindi l'output resta
identico al client Python: parita' 30/30 invariata).

- due fasi: "Scaricamento" (byte da Content-Length) ed "Estrazione" (byte
  compressi consumati + membri processati: nuovo contatore in gz_reader e
  callback tar_progress_fn/tar_extract_cb)
- controllo con CELLAR_PROGRESS=auto|bar|plain|off (default auto)
- nessun codice ANSI, solo '\r' e riempimento con spazi; glifi ASCII se la
  locale non e' UTF-8, larghezza da TIOCGWINSZ e misurata in colonne (i glifi
  UTF-8 sono multi-byte), ridisegno throttled, velocita' a media mobile, ETA
- percorsi d'errore: progress_abort() chiude la riga senza riepilogo; il file
  parziale resta come nel client Python
- tests/progress_test.sh: pipe silenziosa, PTY via script (barra, ETA, riepilogo,
  nessun ANSI, righe entro la larghezza), modalita' plain e off, integrita' del
  file scaricato e della bottiglia installata (13/13 verdi)
- tests/parity_test.sh resta 30/30; mock_server.py con --throttle per i test

Makefile

@@ -50,7 +50,8 @@ verify: all
 	tests/verify_binary.sh $(DIST)/$(NAME)
 
 test: asan
-	tests/parity_test.sh
+	tests/parity_test.sh      # parita' col client Python (30 casi + artefatti)
+	tests/progress_test.sh    # barra di avanzamento (pipe/PTY/plain/off)
 
 clean:
 	rm -rf $(DIST) build tests/tmp

README.md

@@ -17,6 +17,20 @@ Autore: Matteo Benedetto — progetto derivato da `enne2/cellar` (commit `f5216b
 | Build | `x86_64` static, `i686` static, `aarch64` static (cross) |
 | Installazione locale | `~/.local/bin/cellar-cli` → symlink a `dist/cellar-cli` |
 
+## Download dei binari pronti
+
+Nella release **v1.0.0** sono allegati tre binari statici (nessuna dipendenza a runtime):
+
+| file | architettura | ABI minima |
+|---|---|---|
+| `cellar-cli-1.0.0-linux-x86_64-static` | x86-64 (amd64) | Linux, ABI 3.2.0 |
+| `cellar-cli-1.0.0-linux-i686-static` | i686 (x86 32 bit) | Linux, ABI 3.2.0 |
+| `cellar-cli-1.0.0-linux-aarch64-static` | aarch64 (arm64) | Linux, ABI 3.7.0 |
+
+Insieme a `SHA256SUMS.txt` per la verifica: `sha256sum -c SHA256SUMS.txt`.
+
+Pubblicato su Gitea: <https://git.enne2.net/enne2/cellar-cli-c/releases/tag/v1.0.0>
+
 ## Build
 
 ```bash
@@ -67,6 +81,37 @@ cellar-cli --server http://10.8.0.3:8080 list     # override del server
 
 Exit code: `0` ok, `1` errore HTTP/rete/file, `2` argomenti non validi (come argparse).
 
+## Barra di avanzamento
+
+Durante `install`, `wizard-install` e `download` viene mostrata una barra su una riga,
+con due fasi (`Scaricamento` ed `Estrazione`):
+
+```
+Scaricamento [████████████░░░░░░░░░░░░]  58%  6.7 MB/11.5 MB  3.0 MB/s  ETA 00:01
+Estrazione   [████████████████████████] 100%  11.5 MB/11.5 MB  178 MB/s  membri: 20
+```
+
+- **attiva solo se stdout è un terminale**: con output rediretto, in pipeline, in cron o
+  nei log **non stampa nulla** — per questo l'output resta identico al client Python;
+- controllo con la variabile d'ambiente **`CELLAR_PROGRESS`**:
+  - `auto` (default) → barra su terminale, silenzio altrove;
+  - `bar` → barra anche con output rediretto;
+  - `plain` → una riga ogni 10% (per log e cron, senza disegno);
+  - `off` → disattivata;
+- **nessun codice ANSI**: solo `\r` e riempimento con spazi, quindi funziona anche su
+  console vecchie e seriali; glifi ASCII (`#`/`-`) se la locale non è UTF-8, blocchi
+  Unicode (`█`/`░`) se lo è;
+- larghezza adattata al terminale (`TIOCGWINSZ`, fallback 80 colonne, max 200) e misurata
+  in **colonne**, non in byte (i glifi UTF-8 sono multi-byte);
+- ridisegno limitato a ~8 volte al secondo, velocità con media mobile, ETA mostrata solo
+  quando la stima è affidabile;
+- `CELLAR_PROGRESS_DEBUG=1` stampa su stderr modalità/larghezza calcolate (diagnostica).
+
+```bash
+CELLAR_PROGRESS=plain cellar-cli install 'Gioco'   # output adatto a un log
+CELLAR_PROGRESS=off   cellar-cli install 'Gioco'   # nessuna barra
+```
+
 ## Retrocompatibilità (le scelte che contano)
 
 - **Binario statico** (`-static`): nessuna dipendenza da glibc a runtime, quindi gira su
@@ -114,6 +159,7 @@ sei casi di errore di argomenti, più verifiche sugli artefatti:
 | Confronto nomi case-insensitive | ASCII (`tolower`) invece di `str.lower()` Unicode |
 | EOF su una richiesta interattiva | Python solleva `EOFError` (exit 1); qui si stampa `EOFError: EOF when reading a line` e si esce **1**. Nei prompt con default (nome archivio, descrizione…) su EOF si applica il default, così i wizard restano usabili da script |
 | Upload multipart | In **streaming** (il client Python legge l'intero archivio in RAM) |
+| Barra di avanzamento | Aggiunta (il CLI Python non stampa nulla durante download/estrazione). Attiva solo su terminale, quindi l'output rediretto resta identico all'originale |
 | TLS | Non supportato (niente OpenSSL): serve `http://`, oppure un reverse proxy TLS. Il server Cellar è HTTP |
 | Timeout di rete | Connect 15 s, I/O 300 s (urllib non ha timeout) |
 | Redirect | Seguiti come `urllib.request`: GET/HEAD su 301/302/303/307/308, POST→GET su 301/302/303 |
@@ -121,11 +167,17 @@ sei casi di errore di argomenti, più verifiche sugli artefatti:
 ## Test e verifica
 
 ```bash
-make test                                  # parità (usa la build ASan)
+make test                                    # parità + barra (build ASan)
 C_BIN=dist/cellar-cli tests/parity_test.sh    # parità con il binario statico
+C_BIN=dist/cellar-cli tests/progress_test.sh  # barra: pipe silenziosa, PTY, plain, off
 make verify                                   # file/ldd/ABI/simboli GLIBC/syscall/smoke test
 ```
 
+`tests/progress_test.sh` usa un server mock con throttling (`--throttle` byte/s) e
+`script -qec` per allocare un PTY: verifica che su pipe non ci sia alcun output di
+progresso, che su terminale compaiano le due fasi con ETA e riepilogo, che nessuna riga
+superi la larghezza del terminale e che non ci siano codici ANSI.
+
 ## Struttura
 
 ```
@@ -140,6 +192,7 @@ src/config.{c,h}    ~/.cellar.conf (INI in stile configparser)
 src/bottle.{c,h}    record archivi, scansione bottiglie, bottle.yml, backup
 src/ui.{c,h}        tabelle e JSON con larghezze in code point (come le f-string)
 src/ops.{c,h}       list/upload/download/install
+src/progress.{c,h}  barra di avanzamento (download + estrazione, env CELLAR_PROGRESS)
 src/wizard.{c,h}    flussi interattivi
 src/main.c          CLI e messaggi di errore in stile argparse
 third_party/        miniz (unlicense/MIT) + licenza

SHA256SUMS.txt

@@ -0,0 +1,3 @@
+0c454b2c65ac872efcd19888f996f3de17e6d69541cfc8b2657c0a0bfaf9b23c  cellar-cli-1.0.0-linux-x86_64-static
+16c7db8c6667ff46c4a276bf7985b2ebc1cb5078f079651414472d47ef5f9ad7  cellar-cli-1.0.0-linux-i686-static
+11ad5ae2b5916c21d0ed2f5fa7a640e787596da2df4f5d3685b1bb48505d8f7b  cellar-cli-1.0.0-linux-aarch64-static

src/gzip.c

@@ -30,6 +30,7 @@ struct gz_reader {
     mz_stream zs;
     FILE *fp;
     char in[GZ_BUFSZ];
+    unsigned long long total_in; /* byte compressi consumati */
     int stream_end;
     unsigned long crc;
     unsigned long long total_out;
@@ -247,6 +248,11 @@ gz_reader *gzr_open(const char *path, cerror *e)
         free(r);
         return NULL;
     }
+    /* i byte dell'header fanno parte dell'avanzamento */
+    {
+        long pos = ftell(r->fp);
+        r->total_in = (pos > 0) ? (unsigned long long)pos : 0;
+    }
     int rc = mz_inflateInit2(&r->zs, -15); /* deflate raw */
     if (rc != MZ_OK) {
         err_set(e, ERR_MISC, 0, "inflate init failed (%d)", rc);
@@ -286,6 +292,7 @@ long gzr_read(gz_reader *r, void *buf, size_t cap, cerror *e)
                 }
                 break; /* EOF inatteso: lo segnala il chiamante */
             }
+            r->total_in += (unsigned long long)n;
             r->zs.next_in = (unsigned char *)r->in;
             r->zs.avail_in = (unsigned int)n;
         }
@@ -310,6 +317,16 @@ long gzr_read(gz_reader *r, void *buf, size_t cap, cerror *e)
     return (long)produced;
 }
 
+void gzr_progress(gz_reader *r, long long *in_bytes, long long *out_bytes)
+{
+    if (!r)
+        return;
+    if (in_bytes)
+        *in_bytes = (long long)r->total_in;
+    if (out_bytes)
+        *out_bytes = (long long)r->total_out;
+}
+
 void gzr_close(gz_reader *r)
 {
     if (!r)

src/gzip.h

@@ -19,6 +19,8 @@ int gzw_close(gz_writer *w, cerror *e);
 gz_reader *gzr_open(const char *path, cerror *e);
 /* Ritorna il numero di byte letti, 0 a EOF, -1 su errore. */
 long gzr_read(gz_reader *r, void *buf, size_t cap, cerror *e);
+/* Avanzamento: byte compressi consumati e byte decompressi prodotti. */
+void gzr_progress(gz_reader *r, long long *in_bytes, long long *out_bytes);
 void gzr_close(gz_reader *r);
 
 #endif /* CELLAR_GZIP_H */

src/ops.c

@@ -4,6 +4,7 @@
 #include "fsutil.h"
 #include "http.h"
 #include "json.h"
+#include "progress.h"
 #include "tar.h"
 #include "ui.h"
 
@@ -141,6 +142,7 @@ int ops_upload(const char *server, const char *filepath, const mp_field *fields,
 typedef struct {
     FILE *fp;
     long long written;
+    progress *pr; /* opzionale: barra di avanzamento */
 } file_sink;
 
 static int sink_write(void *ctx, const char *buf, size_t len, cerror *e)
@@ -151,6 +153,8 @@ static int sink_write(void *ctx, const char *buf, size_t len, cerror *e)
         return -1;
     }
     s->written += (long long)len;
+    if (s->pr)
+        progress_update(s->pr, s->written);
     return 0;
 }
 
@@ -187,9 +191,12 @@ static int download_to(const char *server, long long archive_id, const char *des
         csresponse_free(&meta);
         return -1;
     }
+    progress pr;
+    progress_init(&pr, "Scaricamento", meta.content_length);
     file_sink sink;
     sink.fp = fp;
     sink.written = 0;
+    sink.pr = ≺
     int rc = http_read_body(c, sink_write, &sink, NULL, e);
     if (fclose(fp) != 0 && rc == 0) {
         err_set_errno(e, ERR_FILE, "cannot write %s", dest);
@@ -197,8 +204,11 @@ static int download_to(const char *server, long long archive_id, const char *des
     }
     http_close(c);
     csresponse_free(&meta);
-    if (rc != 0)
+    if (rc != 0) {
-        return -1;
+        progress_abort(&pr);
+        return -1; /* come il client Python: il file parziale resta */
+    }
+    progress_finish(&pr);
     if (announce)
         printf("Downloaded to %s\n", dest);
     return 0;
@@ -252,9 +262,12 @@ int ops_download(const char *server, long long archive_id, const char *output, c
             csresponse_free(&meta);
             return -1;
         }
+        progress pr;
+        progress_init(&pr, "Scaricamento", meta.content_length);
         file_sink sink;
         sink.fp = fp;
         sink.written = 0;
+        sink.pr = ≺
         int rc = http_read_body(c, sink_write, &sink, NULL, e);
         if (fclose(fp) != 0 && rc == 0) {
             err_set_errno(e, ERR_FILE, "cannot write %s", dest);
@@ -262,14 +275,25 @@ int ops_download(const char *server, long long archive_id, const char *output, c
         }
         http_close(c);
         csresponse_free(&meta);
-        if (rc != 0)
+        if (rc != 0) {
+            progress_abort(&pr);
             return -1;
+        }
+        progress_finish(&pr);
         printf("Downloaded to %s\n", dest);
         return 0;
     }
     return download_to(server, archive_id, output, 1, e);
 }
 
+static int extract_progress_cb(void *ctx, long long consumed, long long members)
+{
+    progress *p = ctx;
+    progress_set_members(p, members);
+    progress_update(p, consumed);
+    return 0;
+}
+
 int ops_install_record(const char *server, const archive_rec *rec, const char *bottles_dir, int replace,
                        const char *ref, cerror *e)
 {
@@ -319,8 +343,18 @@ int ops_install_record(const char *server, const archive_rec *rec, const char *b
 
     if (mkdir_p(extract_dir, e) != 0)
         goto cleanup;
-    if (tar_extract(download_path, extract_dir, e) != 0)
+    {
+        struct stat arc_st;
+        long long arc_size = (stat(download_path, &arc_st) == 0) ? (long long)arc_st.st_size : -1;
+        progress px;
+        progress_init(&px, "Estrazione", arc_size);
+        int xrc = tar_extract_cb(download_path, extract_dir, extract_progress_cb, &px, e);
+        if (xrc != 0) {
+            progress_abort(&px);
             goto cleanup;
+        }
+        progress_finish(&px);
+    }
 
     strlist subdirs;
     strlist_init(&subdirs);

src/progress.c

@@ -0,0 +1,336 @@
+/* progress.c — implementazione della barra (vd. progress.h). */
+#include "progress.h"
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <unistd.h>
+
+#define PROG_MIN_WIDTH 40
+#define PROG_MAX_WIDTH 200
+#define PROG_DRAW_INTERVAL 0.12 /* secondi tra due ridisegni */
+#define PROG_SAMPLE_INTERVAL 0.25
+#define PROG_ASCII_FULL '#'
+#define PROG_ASCII_EMPTY '-'
+#define PROG_UNI_FULL "\xe2\x96\x88"  /* U+2588 */
+#define PROG_UNI_EMPTY "\xe2\x96\x91" /* U+2591 */
+
+static double now_monotonic(void)
+{
+    struct timespec ts;
+    if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
+        return 0.0;
+    return (double)ts.tv_sec + (double)ts.tv_nsec / 1e9;
+}
+
+static int env_is_utf8(void)
+{
+    const char *vars[] = {getenv("LC_ALL"), getenv("LC_CTYPE"), getenv("LANG")};
+    for (size_t i = 0; i < sizeof(vars) / sizeof(vars[0]); i++) {
+        const char *v = vars[i];
+        if (!v || !*v)
+            continue;
+        char buf[64];
+        size_t n = strlen(v);
+        if (n >= sizeof(buf))
+            n = sizeof(buf) - 1;
+        for (size_t k = 0; k < n; k++)
+            buf[k] = (char)tolower((unsigned char)v[k]);
+        buf[n] = '\0';
+        if (strstr(buf, "utf-8") || strstr(buf, "utf8"))
+            return 1;
+        /* la prima variabile impostata vince (come fa setlocale) */
+        return 0;
+    }
+    return 0;
+}
+
+prog_mode progress_mode_from_env(void)
+{
+    const char *v = getenv("CELLAR_PROGRESS");
+    if (!v || !*v)
+        return PROG_AUTO;
+    if (!strcmp(v, "bar") || !strcmp(v, "1") || !strcmp(v, "on") || !strcmp(v, "yes"))
+        return PROG_BAR;
+    if (!strcmp(v, "plain") || !strcmp(v, "line"))
+        return PROG_PLAIN;
+    if (!strcmp(v, "off") || !strcmp(v, "0") || !strcmp(v, "none") || !strcmp(v, "no"))
+        return PROG_OFF;
+    return PROG_AUTO;
+}
+
+static int terminal_width(void)
+{
+    struct winsize ws;
+    if (isatty(STDOUT_FILENO) && ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col > 0) {
+        int w = ws.ws_col;
+        if (w < PROG_MIN_WIDTH)
+            w = PROG_MIN_WIDTH;
+        if (w > PROG_MAX_WIDTH)
+            w = PROG_MAX_WIDTH;
+        return w;
+    }
+    return 80;
+}
+
+/* Dimensione in stile client Python: MiB etichettati MB. */
+static void fmt_size(long long bytes, char *out, size_t outsz)
+{
+    double b = (double)bytes;
+    if (bytes < 1024)
+        snprintf(out, outsz, "%lld B", bytes);
+    else if (bytes < 1024 * 1024)
+        snprintf(out, outsz, "%.0f kB", b / 1024.0);
+    else if (bytes < 1024LL * 1024 * 1024)
+        snprintf(out, outsz, "%.1f MB", b / (1024.0 * 1024.0));
+    else
+        snprintf(out, outsz, "%.2f GB", b / (1024.0 * 1024.0 * 1024.0));
+}
+
+static void fmt_speed(double bytes_per_sec, char *out, size_t outsz)
+{
+    double b = bytes_per_sec;
+    if (b < 1024)
+        snprintf(out, outsz, "%.0f B/s", b);
+    else if (b < 1024.0 * 1024.0)
+        snprintf(out, outsz, "%.0f kB/s", b / 1024.0);
+    else
+        snprintf(out, outsz, "%.1f MB/s", b / (1024.0 * 1024.0));
+}
+
+static void fmt_eta(double seconds, char *out, size_t outsz)
+{
+    if (seconds < 0 || seconds > 99 * 3600) {
+        snprintf(out, outsz, "--:--");
+        return;
+    }
+    long s = (long)(seconds + 0.5);
+    snprintf(out, outsz, "%02ld:%02ld", s / 60, s % 60);
+}
+
+void progress_init(progress *p, const char *label, long long total)
+{
+    memset(p, 0, sizeof(*p));
+    p->mode = progress_mode_from_env();
+    if (p->mode == PROG_AUTO) {
+        /* auto: barra solo su terminale, silenzio se rediretto/in pipeline */
+        p->mode = isatty(STDOUT_FILENO) ? PROG_BAR : PROG_OFF;
+    }
+    p->label = label ? label : "";
+    p->total = total;
+    p->last_percent = -1;
+    p->plain_step = 0;
+    p->width = terminal_width();
+    p->unicode = env_is_utf8();
+    p->t_start = now_monotonic();
+    p->t_last_draw = -1.0;
+    p->t_last_sample = p->t_start;
+    if (getenv("CELLAR_PROGRESS_DEBUG"))
+        fprintf(stderr, "[debug progress] mode=%d width=%d unicode=%d isatty=%d\n", (int)p->mode,
+                p->width, p->unicode, isatty(STDOUT_FILENO));
+    if (p->mode == PROG_PLAIN)
+        printf("%s: avvio...\n", p->label);
+}
+
+void progress_set_members(progress *p, long long members)
+{
+    p->members = members;
+}
+
+static void build_line(progress *p, char *line, size_t linesz, int final)
+{
+    char done_s[32], total_s[32], speed_s[32], eta_s[16];
+    fmt_size(p->done, done_s, sizeof(done_s));
+    if (p->total > 0)
+        fmt_size(p->total, total_s, sizeof(total_s));
+    else
+        snprintf(total_s, sizeof(total_s), "?");
+
+    int percent = -1;
+    if (p->total > 0) {
+        percent = (int)((p->done * 100) / p->total);
+        if (percent > 100)
+            percent = 100;
+    }
+    fmt_speed(p->rate, speed_s, sizeof(speed_s));
+    double eta = -1.0;
+    if (p->total > 0 && p->rate > 4096.0)
+        eta = (double)(p->total - p->done) / p->rate;
+    fmt_eta(eta, eta_s, sizeof(eta_s));
+
+    char members_s[48];
+    members_s[0] = '\0';
+    if (p->members > 0)
+        snprintf(members_s, sizeof(members_s), "  membri: %lld", p->members);
+
+    /* suffisso senza barra */
+    char suffix[192];
+    if (percent >= 0)
+        snprintf(suffix, sizeof(suffix), "] %3d%%  %s/%s  %s%s", percent, done_s, total_s, speed_s,
+                 members_s);
+    else
+        snprintf(suffix, sizeof(suffix), "] %s  %s%s", done_s, speed_s, members_s);
+    if (!final && p->rate <= 4096.0) {
+        /* senza stima affidabile non mostriamo ETA */
+    } else if (eta >= 0) {
+        char tmp[224];
+        snprintf(tmp, sizeof(tmp), "%s  ETA %s", suffix, eta_s);
+        snprintf(suffix, sizeof(suffix), "%s", tmp);
+    }
+
+    if (p->mode == PROG_PLAIN) {
+        /* log-friendly: niente barra grafica, una riga per soglia */
+        if (percent >= 0)
+            snprintf(line, linesz, "%s: %d%%  %s/%s  %s%s", p->label, percent, done_s, total_s,
+                     speed_s, members_s);
+        else
+            snprintf(line, linesz, "%s: %s  %s%s", p->label, done_s, speed_s, members_s);
+        return;
+    }
+
+    char prefix[96];
+    snprintf(prefix, sizeof(prefix), "%s [", p->label);
+
+    size_t avail = 0;
+    size_t plen = strlen(prefix), slen = strlen(suffix);
+    if (p->width > (int)(plen + slen))
+        avail = (size_t)p->width - plen - slen;
+    if (avail < 8) {
+        /* troppo stretta per la barra: riduce il suffisso */
+        snprintf(line, linesz, "%s%s", prefix, suffix);
+        return;
+    }
+
+    size_t filled = 0;
+    if (p->total > 0)
+        filled = (size_t)((p->done * (long long)avail) / p->total);
+    if (filled > avail)
+        filled = avail;
+
+    size_t used = 0;
+    int n = snprintf(line, linesz, "%s", prefix);
+    if (n > 0)
+        used = (size_t)n;
+    const char *full = p->unicode ? PROG_UNI_FULL : NULL;
+    const char *empty = p->unicode ? PROG_UNI_EMPTY : NULL;
+    for (size_t i = 0; i < avail && used + 8 < linesz; i++) {
+        if (i < filled) {
+            if (full)
+                used += (size_t)snprintf(line + used, linesz - used, "%s", full);
+            else
+                line[used++] = PROG_ASCII_FULL;
+        } else {
+            if (empty)
+                used += (size_t)snprintf(line + used, linesz - used, "%s", empty);
+            else
+                line[used++] = PROG_ASCII_EMPTY;
+        }
+    }
+    line[used] = '\0';
+    snprintf(line + used, linesz - used, "%s", suffix);
+}
+
+static void draw_line(progress *p, const char *line)
+{
+    /* attenzione: i glifi della barra sono multi-byte in UTF-8, quindi il
+     * conteggio per il ridisegno e la pulizia va fatto in COLONNE (code point),
+     * non in byte, altrimenti la riga supera la larghezza del terminale. */
+    size_t cols = utf8_count(line);
+    if (getenv("CELLAR_PROGRESS_DEBUG"))
+        fprintf(stderr, "[debug progress] line bytes=%zu cols=%zu\n", strlen(line), cols);
+    fputs("\r", stdout);
+    fputs(line, stdout);
+    for (size_t i = cols; i < (size_t)p->last_cols; i++)
+        fputc(' ', stdout);
+    p->last_cols = (int)cols;
+    fflush(stdout);
+}
+
+void progress_update(progress *p, long long done)
+{
+    if (p->mode == PROG_OFF || p->finished)
+        return;
+    p->done = done;
+
+    double now = now_monotonic();
+    if (now - p->t_last_sample >= PROG_SAMPLE_INTERVAL) {
+        double dt = now - p->t_last_sample;
+        long long delta = done - p->last_sample_done;
+        if (dt > 0 && delta >= 0) {
+            double inst = (double)delta / dt;
+            p->rate = (p->rate > 0.0) ? (0.7 * p->rate + 0.3 * inst) : inst;
+        }
+        p->last_sample_done = done;
+        p->t_last_sample = now;
+    }
+
+    if (p->mode == PROG_PLAIN) {
+        int percent = (p->total > 0) ? (int)((done * 100) / p->total) : 0;
+        if (p->total > 0) {
+            if (percent >= p->plain_step) {
+                char line[512];
+                build_line(p, line, sizeof(line), 0);
+                printf("%s\n", line);
+                p->plain_step += 10;
+            }
+        } else if (now - p->t_last_draw >= 3.0) {
+            char line[512];
+            build_line(p, line, sizeof(line), 0);
+            printf("%s\n", line);
+            p->t_last_draw = now;
+        }
+        return;
+    }
+
+    /* PROG_BAR */
+    int percent = (p->total > 0) ? (int)((done * 100) / p->total) : -1;
+    if (p->t_last_draw > 0.0 && now - p->t_last_draw < PROG_DRAW_INTERVAL)
+        return;
+    if (percent == p->last_percent && p->total > 0 && done != p->total)
+        return;
+    p->last_percent = percent;
+    p->t_last_draw = now;
+
+    char line[512];
+    build_line(p, line, sizeof(line), 0);
+    draw_line(p, line);
+}
+
+void progress_finish(progress *p)
+{
+    if (p->mode == PROG_OFF || p->finished)
+        return;
+    p->finished = 1;
+    if (p->total > 0)
+        p->done = p->total;
+
+    double elapsed = now_monotonic() - p->t_start;
+    if (elapsed <= 0.0)
+        elapsed = 0.001;
+    double avg = (double)p->done / elapsed;
+
+    char done_s[32], speed_s[32];
+    fmt_size(p->done, done_s, sizeof(done_s));
+    fmt_speed(avg, speed_s, sizeof(speed_s));
+
+    if (p->mode == PROG_PLAIN) {
+        printf("%s: completato (%s in %.1f s, %s)\n", p->label, done_s, elapsed, speed_s);
+        return;
+    }
+    char line[512];
+    build_line(p, line, sizeof(line), 1);
+    draw_line(p, line);
+    printf("\n%s: %s in %.1f s (%s)\n", p->label, done_s, elapsed, speed_s);
+}
+
+void progress_abort(progress *p)
+{
+    if (p->mode == PROG_OFF || p->finished)
+        return;
+    p->finished = 1;
+    if (p->mode == PROG_BAR && p->last_cols > 0)
+        printf("\n");
+}

src/progress.h

@@ -0,0 +1,52 @@
+/* progress.h — barra di avanzamento per download ed estrazione.
+ *
+ * Attiva solo quando ha senso: con CELLAR_PROGRESS=auto (default) disegna la
+ * barra se stdout e' un terminale, e non stampa nulla se l'output e' rediretto
+ * o in pipeline (cosi' l'output resta identico al client Python e i log
+ * restano puliti). Modalita' forzabili: bar, plain, off.
+ *
+ * Nessun codice ANSI: solo '\r' e riempimento con spazi, quindi funziona anche
+ * su console vecchie/seriali. Glyph ASCII di default, Unicode solo se la
+ * locale e' UTF-8.
+ */
+#ifndef CELLAR_PROGRESS_H
+#define CELLAR_PROGRESS_H
+
+#include "common.h"
+
+#include <stddef.h>
+
+typedef enum { PROG_AUTO = 0, PROG_BAR, PROG_PLAIN, PROG_OFF } prog_mode;
+
+typedef struct {
+    prog_mode mode;
+    const char *label;
+    long long total; /* -1 se sconosciuto */
+    long long done;
+    long long members; /* informazione opzionale (estrazione) */
+    double t_start;
+    double t_last_draw;
+    double t_last_sample;
+    double rate; /* byte/s, media mobile */
+    long long last_sample_done;
+    int last_percent;
+    int last_cols; /* larghezza (colonne) dell'ultima riga disegnata, per ripulire */
+    int plain_step; /* prossima soglia in modalita' plain */
+    int width;
+    int unicode;
+    int finished;
+} progress;
+
+/* Modalita' da CELLAR_PROGRESS (auto|bar|plain|off); default auto. */
+prog_mode progress_mode_from_env(void);
+/* Inizializza: in modalita' AUTO decide in base a isatty(stdout). */
+void progress_init(progress *p, const char *label, long long total);
+void progress_set_members(progress *p, long long members);
+/* Aggiorna con i byte completati (throttled: non ridisegna piu' di ~8 volte/s). */
+void progress_update(progress *p, long long done);
+/* Chiude la riga (newline) e stampa il riepilogo finale. */
+void progress_finish(progress *p);
+/* Percorso d'errore: chiude solo la riga, senza riepilogo. */
+void progress_abort(progress *p);
+
+#endif /* CELLAR_PROGRESS_H */

src/tar.c

@@ -374,6 +374,9 @@ int tar_create(const char *archive_path, const char *rootpath, const char *arcna
 typedef struct {
     gz_reader *gz;
     long long remaining; /* byte non ancora letti del membro corrente */
+    tar_progress_fn cb;  /* opzionale: avanzamento */
+    void *cb_ctx;
+    long long members;
 } tr;
 
 static int tr_read_exact(tr *t, void *buf, size_t len, cerror *e)
@@ -389,6 +392,14 @@ static int tr_read_exact(tr *t, void *buf, size_t len, cerror *e)
             return -1;
         }
         off += (size_t)n;
+        if (t->cb) {
+            long long in_bytes = 0;
+            gzr_progress(t->gz, &in_bytes, NULL);
+            if (t->cb(t->cb_ctx, in_bytes, t->members) != 0) {
+                err_set(e, ERR_MISC, 0, "operazione annullata");
+                return -1;
+            }
+        }
     }
     return 0;
 }
@@ -542,7 +553,7 @@ static int apply_times(const char *path, time_t sec, long nsec, int symlink_ok)
     return utimensat(AT_FDCWD, path, times, 0);
 }
 
-int tar_extract(const char *archive_path, const char *destdir, cerror *e)
+int tar_extract_cb(const char *archive_path, const char *destdir, tar_progress_fn cb, void *ctx, cerror *e)
 {
     gz_reader *gz = gzr_open(archive_path, e);
     if (!gz)
@@ -550,6 +561,9 @@ int tar_extract(const char *archive_path, const char *destdir, cerror *e)
     tr t;
     t.gz = gz;
     t.remaining = 0;
+    t.cb = cb;
+    t.cb_ctx = ctx;
+    t.members = 0;
 
     dirfixup *dirs = NULL;
     size_t ndirs = 0, cdirs = 0;
@@ -854,6 +868,8 @@ int tar_extract(const char *archive_path, const char *destdir, cerror *e)
             }
         }
 
+        t.members++;
+
         /* gli override valgono per un solo membro */
         pax_free(&next);
         free(gnu_longname);
@@ -879,3 +895,8 @@ int tar_extract(const char *archive_path, const char *destdir, cerror *e)
     gzr_close(gz);
     return rc;
 }
+
+int tar_extract(const char *archive_path, const char *destdir, cerror *e)
+{
+    return tar_extract_cb(archive_path, destdir, NULL, NULL, e);
+}

src/tar.h

@@ -16,4 +16,9 @@ int tar_create(const char *archive_path, const char *rootpath, const char *arcna
  * (symlink/hardlink preservati, permessi e mtime ripristinati). */
 int tar_extract(const char *archive_path, const char *destdir, cerror *e);
 
+/* Come tar_extract, ma notifica l'avanzamento: byte compressi consumati e
+ * membri gia' processati. Il callback puo' ritornare -1 per interrompere. */
+typedef int (*tar_progress_fn)(void *ctx, long long consumed, long long members);
+int tar_extract_cb(const char *archive_path, const char *destdir, tar_progress_fn cb, void *ctx, cerror *e);
+
 #endif /* CELLAR_TAR_H */

tests/mock_server.py

@@ -19,6 +19,7 @@ import json
 import os
 import re
 import threading
+import time
 from datetime import datetime, timezone
 from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
 from pathlib import Path
@@ -75,8 +76,14 @@ def parse_multipart(body: bytes, content_type: str):
 
 class Handler(BaseHTTPRequestHandler):
     state: State
+    throttle = 0  # byte/s, 0 = nessun limite (per testare la barra di avanzamento)
     protocol_version = "HTTP/1.1"
 
+    @classmethod
+    def _pace(cls, nbytes: int) -> None:
+        if cls.throttle > 0:
+            time.sleep(nbytes / cls.throttle)
+
     def log_message(self, *args):  # silenzioso
         pass
 
@@ -90,7 +97,20 @@ class Handler(BaseHTTPRequestHandler):
 
     def _body(self) -> bytes:
         length = int(self.headers.get("Content-Length") or 0)
-        return self.rfile.read(length) if length else b""
+        if not length:
+            return b""
+        if Handler.throttle <= 0:
+            return self.rfile.read(length)
+        chunks, left = [], length
+        while left > 0:
+            n = min(left, 65536)
+            data = self.rfile.read(n)
+            if not data:
+                break
+            chunks.append(data)
+            left -= len(data)
+            Handler._pace(len(data))
+        return b"".join(chunks)
 
     def do_GET(self):
         path = self.path.split("?")[0]
@@ -113,13 +133,19 @@ class Handler(BaseHTTPRequestHandler):
                     f = self.state.storage / r["stored_name"]
                     if not f.exists():
                         return self._json(404, {"detail": "Stored file not found."})
-                    data = f.read_bytes()
                     self.send_response(200)
                     self.send_header("Content-Type", r.get("content_type") or "application/octet-stream")
                     self.send_header("Content-Disposition", f'attachment; filename="{r["file_name"]}"')
-                    self.send_header("Content-Length", str(len(data)))
+                    self.send_header("Content-Length", str(f.stat().st_size))
                     self.end_headers()
-                    return self.wfile.write(data)
+                    with f.open("rb") as fh:
+                        while True:
+                            chunk = fh.read(65536)
+                            if not chunk:
+                                break
+                            self.wfile.write(chunk)
+                            Handler._pace(len(chunk))
+                    return None
             return self._json(404, {"detail": "Archive not found."})
         if path == "/openapi.json":
             return self._json(200, {"info": {"title": "Bottle Archive Server", "version": "0.1.0"}})
@@ -181,8 +207,10 @@ def main():
     ap = argparse.ArgumentParser()
     ap.add_argument("--port", type=int, default=18099)
     ap.add_argument("--state", required=True)
+    ap.add_argument("--throttle", type=int, default=0, help="byte/s massimi (per testare la barra)")
     args = ap.parse_args()
     Handler.state = State(Path(args.state))
+    Handler.throttle = args.throttle
     srv = ThreadingHTTPServer(("127.0.0.1", args.port), Handler)
     srv.serve_forever()
 

tests/progress_test.sh

@@ -0,0 +1,165 @@
+#!/usr/bin/env bash
+# Test della barra di avanzamento (src/progress.c).
+#
+# Verifica:
+#   1. modalita' auto con output rediretto -> NESSUN output di progresso
+#      (cosi' l'output resta identico al client Python: vedi parity_test.sh);
+#   2. modalita' auto su terminale (PTY via `script`) -> barra disegnata per il
+#      download e per l'estrazione, con riga di riepilogo finale;
+#   3. CELLAR_PROGRESS=plain -> una riga per soglia del 10%, niente barra;
+#   4. CELLAR_PROGRESS=off -> nessun output di progresso anche su PTY;
+#   5. l'output finale (Downloaded to / Installed bottle) resta corretto e
+#      l'archivio scaricato e' integro.
+set -uo pipefail
+
+ROOT=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
+C_BIN="${C_BIN:-$ROOT/dist/cellar-cli}"
+PY="${PYTHON:-python3}"
+WORK="$ROOT/tests/tmp-progress"
+PORT="${PORT:-18097}"
+THROTTLE="${THROTTLE:-3000000}" # 3 MB/s: la barra disegna piu' fotogrammi
+SRV_PID=""
+
+PASS=0
+FAIL=0
+ok() { PASS=$((PASS + 1)); printf '  PASS  %s\n' "$1"; }
+ko() { FAIL=$((FAIL + 1)); printf '  FAIL  %s\n' "$1"; }
+
+cleanup() {
+  [ -n "$SRV_PID" ] && kill "$SRV_PID" 2>/dev/null
+  wait 2>/dev/null
+  return 0
+}
+trap cleanup EXIT
+
+fail_if_missing() {
+  [ -x "$C_BIN" ] || { echo "binario non trovato: $C_BIN (esegui make all)"; exit 1; }
+  command -v script >/dev/null || { echo "serve util-linux 'script' per il test su PTY"; exit 1; }
+}
+fail_if_missing
+
+rm -rf "$WORK"
+mkdir -p "$WORK"/{state,inst,bottles,home}
+
+# bottiglia di prova con un file da ~12 MB (comprimibile poco, cosi' il
+# download dura qualche secondo con il throttling)
+bash "$ROOT/tests/make_fake_bottle.sh" "$WORK/bottles" >/dev/null
+head -c 12000000 /dev/urandom >"$WORK/bottles/Fake Bottle/drive_c/big.bin"
+
+"$PY" "$ROOT/tests/mock_server.py" --port "$PORT" --state "$WORK/state" --throttle "$THROTTLE" &
+SRV_PID=$!
+for _ in $(seq 60); do
+  curl -sf "http://127.0.0.1:$PORT/health" >/dev/null 2>&1 && break
+  sleep 0.1
+done
+
+SRV="http://127.0.0.1:$PORT"
+export HOME="$WORK/home"
+
+# archivio tar.gz valido (l'estrazione deve poter funzionare)
+"$PY" - "$WORK/bottles/Fake Bottle" "$WORK/big.tar.gz" <<'PYEOF'
+import sys, tarfile
+with tarfile.open(sys.argv[2], "w:gz") as tf:
+    tf.add(sys.argv[1], arcname="Fake Bottle")
+PYEOF
+"$C_BIN" --server "$SRV" upload "$WORK/big.tar.gz" --name BigBottle \
+  --bottle-name "Fake Bottle" >/dev/null 2>&1
+echo "  (server mock pronto, archivio valido da $(stat -c%s "$WORK/big.tar.gz") byte caricato)"
+
+# ---------------------------------------------------------------- 1. auto su pipe
+out=$(CELLAR_PROGRESS=auto "$C_BIN" --server "$SRV" download 1 "$WORK/dl-pipe.bin" 2>&1)
+if [ "$out" = "Downloaded to $WORK/dl-pipe.bin" ]; then
+  ok "auto su pipe: nessun output di progresso"
+else
+  ko "auto su pipe: nessun output di progresso (ottenuto: $(printf '%s' "$out" | head -2 | tr '\n' '|'))"
+fi
+
+# ------------------------------------------------------------ 2. auto su PTY (barra)
+pty_out=$(script -qec "CELLAR_PROGRESS=auto '$C_BIN' --server '$SRV' install 'Fake Bottle' --bottles-dir '$WORK/inst'" /dev/null 2>&1 | tr '\r' '\n')
+if grep -q "Scaricamento \[" <<<"$pty_out"; then
+  ok "PTY: barra del download disegnata"
+else
+  ko "PTY: barra del download disegnata"
+fi
+if grep -q "Estrazione \[" <<<"$pty_out" || grep -q "^Estrazione:" <<<"$pty_out"; then
+  ok "PTY: fase di estrazione tracciata"
+else
+  ko "PTY: fase di estrazione tracciata"
+fi
+if grep -qE "^Scaricamento: [0-9.]+ (B|kB|MB|GB) in [0-9.]+ s" <<<"$pty_out"; then
+  ok "PTY: riepilogo finale del download"
+else
+  ko "PTY: riepilogo finale del download"
+fi
+if grep -q "^Installed bottle 'Fake Bottle' to " <<<"$pty_out"; then
+  ok "PTY: output finale corretto dopo la barra"
+else
+  ko "PTY: output finale corretto dopo la barra"
+fi
+if grep -q "ETA" <<<"$pty_out"; then
+  ok "PTY: ETA mostrata durante il trasferimento"
+else
+  ko "PTY: ETA mostrata durante il trasferimento"
+fi
+# nessun codice ANSI (retro-compatibilita' delle console)
+if grep -qP '\x1b\[' <<<"$pty_out"; then
+  ko "PTY: nessun codice ANSI nel disegno"
+else
+  ok "PTY: nessun codice ANSI nel disegno"
+fi
+# la barra non deve eccedere la larghezza del terminale (script: 80 colonne).
+# I glifi Unicode sono multi-byte: si contano i code point, non i byte.
+# solo le righe disegnate dalla barra (l'output normale puo' essere lungo)
+bar_lines=$(grep -E "^(Scaricamento|Estrazione)[ :]" <<<"$pty_out")
+longest=$(printf '%s' "$bar_lines" | "$PY" -c "import sys; print(max((len(l) for l in sys.stdin.read().split('\\n')), default=0))")
+if [ "${longest:-0}" -le 80 ]; then
+  ok "PTY: righe entro 80 colonne (max $longest)"
+else
+  ko "PTY: righe entro 80 colonne (max $longest)"
+  printf '%s' "$bar_lines" | "$PY" -c "
+import sys
+lines = sys.stdin.buffer.read().decode('utf-8', 'replace').split('\n')
+for n, l in sorted(((len(x), x) for x in lines), reverse=True)[:3]:
+    print(f'    {n:3} |{l}|')
+"
+fi
+
+# --------------------------------------------------------------- 3. modalita' plain
+plain_out=$(CELLAR_PROGRESS=plain "$C_BIN" --server "$SRV" download 1 "$WORK/dl-plain.bin" 2>&1)
+lines=$(grep -c "^Scaricamento: [0-9]" <<<"$plain_out")
+if [ "$lines" -ge 10 ]; then
+  ok "plain: $lines righe di avanzamento (>=10)"
+else
+  ko "plain: righe di avanzamento insufficienti ($lines)"
+fi
+if grep -q "^Scaricamento: completato" <<<"$plain_out" && ! grep -q "\[" <<<"$plain_out"; then
+  ok "plain: riepilogo presente e nessuna barra grafica"
+else
+  ko "plain: riepilogo presente e nessuna barra grafica"
+fi
+
+# ---------------------------------------------------------------------- 4. off
+off_out=$(script -qec "CELLAR_PROGRESS=off '$C_BIN' --server '$SRV' download 1 '$WORK/dl-off.bin'" /dev/null 2>&1 | tr '\r' '\n')
+if ! grep -qE "Scaricamento" <<<"$off_out"; then
+  ok "off: nessun output di progresso (anche su PTY)"
+else
+  ko "off: nessun output di progresso (anche su PTY)"
+fi
+
+# ------------------------------------------------- 5. integrita' dell'artefatto
+if [ -f "$WORK/dl-pipe.bin" ] && cmp -s "$WORK/dl-pipe.bin" "$WORK/big.tar.gz"; then
+  ok "integrita': il file scaricato coincide con quello caricato"
+else
+  ko "integrita': il file scaricato coincide con quello caricato"
+fi
+if [ -f "$WORK/inst/Fake Bottle/bottle.yml" ]; then
+  ok "install: bottiglia installata nonostante il disegno della barra"
+else
+  ko "install: bottiglia installata nonostante il disegno della barra"
+fi
+
+echo
+echo "=================================================="
+printf 'PASS: %d   FAIL: %d\n' "$PASS" "$FAIL"
+[ "$FAIL" -eq 0 ] || exit 1
+echo "barra di avanzamento ok ✔"

tests/tmp-progress/bottles/Fake Bottle/bottle.yml

@@ -0,0 +1,5 @@
+Name: 'Fake Bottle'
+Runner: soda-9.0-1
+Arch: win32
+Windows: win10
+Environment: Gaming

tests/tmp-progress/bottles/Fake Bottle/dosdevices/c_drive

@@ -0,0 +1 @@
+../drive_c/config.ini

tests/tmp-progress/bottles/Fake Bottle/drive_c/Program Files/Game/game.exe

@@ -0,0 +1 @@
+hello world

tests/tmp-progress/bottles/Fake Bottle/drive_c/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.txt

@@ -0,0 +1 @@
+long path

tests/tmp-progress/bottles/Fake Bottle/drive_c/broken_link

@@ -0,0 +1 @@
+/nonexistent/target

tests/tmp-progress/bottles/Fake Bottle/drive_c/config.ini

@@ -0,0 +1 @@
+config

tests/tmp-progress/bottles/Fake Bottle/drive_c/link_to_config

@@ -0,0 +1 @@
+config.ini

tests/tmp-progress/bottles/Fake Bottle/drive_c/perché.txt

@@ -0,0 +1 @@
+unicode

tests/tmp-progress/bottles/Fake Bottle/drive_c/program

@@ -0,0 +1 @@
+binario

tests/tmp-progress/bottles/Fake Bottle/nested/deep/deeper/file.txt

@@ -0,0 +1 @@
+deep

tests/tmp-progress/home/.cellar.conf

@@ -0,0 +1,4 @@
+[cellar]
+server = http://127.0.0.1:8080
+bottles_dir = /home/enne2/Dev/cellar-cli-c/tests/tmp-progress/home/.var/app/com.usebottles.bottles/data/bottles/bottles
+

tests/tmp-progress/inst/Fake Bottle/bottle.yml

@@ -0,0 +1,5 @@
+Name: 'Fake Bottle'
+Runner: soda-9.0-1
+Arch: win32
+Windows: win10
+Environment: Gaming

tests/tmp-progress/inst/Fake Bottle/dosdevices/c_drive

@@ -0,0 +1 @@
+../drive_c/config.ini

tests/tmp-progress/inst/Fake Bottle/drive_c/Program Files/Game/game.exe

@@ -0,0 +1 @@
+hello world

tests/tmp-progress/inst/Fake Bottle/drive_c/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.txt

@@ -0,0 +1 @@
+long path

tests/tmp-progress/inst/Fake Bottle/drive_c/broken_link

@@ -0,0 +1 @@
+/nonexistent/target

tests/tmp-progress/inst/Fake Bottle/drive_c/config.ini

@@ -0,0 +1 @@
+config

tests/tmp-progress/inst/Fake Bottle/drive_c/link_to_config

@@ -0,0 +1 @@
+config.ini

tests/tmp-progress/inst/Fake Bottle/drive_c/perché.txt

@@ -0,0 +1 @@
+unicode

tests/tmp-progress/inst/Fake Bottle/drive_c/program

@@ -0,0 +1 @@
+binario

tests/tmp-progress/inst/Fake Bottle/nested/deep/deeper/file.txt

@@ -0,0 +1 @@
+deep

tests/tmp-progress/state/db.json

@@ -0,0 +1,18 @@
+[
+  {
+    "name": "BigBottle",
+    "bottle_name": "Fake Bottle",
+    "description": null,
+    "tags": null,
+    "arch": null,
+    "runner": null,
+    "windows_version": null,
+    "id": 1,
+    "file_name": "big.tar.gz",
+    "stored_name": "b2b18dc0668e8b5b661c952112aeb58a.tar.gz",
+    "content_type": "application/gzip",
+    "size_bytes": 12009363,
+    "sha256": "b2b18dc0668e8b5b661c952112aeb58a3b16a1552156b0098823e47ca89f2434",
+    "created_at": "2026-09-20T15:44:25.190979+00:00"
+  }
+]