/* * 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. */ #include "git-compat-util.h" #include "gettext.h" #include "progress.h" #include "strbuf.h" #include "trace.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; char display[32]; }; struct progress { const char *title; int last_value; unsigned total; unsigned last_percent; unsigned delay; unsigned delayed_percent_treshold; struct throughput *throughput; }; static volatile sig_atomic_t progress_update; static void progress_interval(int signum) { progress_update = 1; } static void set_progress_signal(void) { struct sigaction sa; struct itimerval v; 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,},}; 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 int display(struct progress *progress, unsigned n, const char *done) { const char *eol, *tp; if (progress->delay) { if (!progress_update || --progress->delay) return 0; if (progress->total) { unsigned percent = n * 100 / progress->total; if (percent > progress->delayed_percent_treshold) { /* inhibit this progress report entirely */ clear_progress_signal(); progress->delay = -1; progress->total = 0; return 0; } } } progress->last_value = n; tp = (progress->throughput) ? progress->throughput->display : ""; eol = done ? done : " \r"; if (progress->total) { unsigned percent = n * 100 / progress->total; if (percent != progress->last_percent || progress_update) { progress->last_percent = percent; if (is_foreground_fd(fileno(stderr)) || done) { fprintf(stderr, "%s: %3u%% (%u/%u)%s%s", progress->title, percent, n, progress->total, tp, eol); fflush(stderr); } progress_update = 0; return 1; } } else if (progress_update) { if (is_foreground_fd(fileno(stderr)) || done) { fprintf(stderr, "%s: %u%s%s", progress->title, n, tp, eol); fflush(stderr); } progress_update = 0; return 1; } return 0; } static void throughput_string(struct strbuf *buf, off_t total, unsigned int rate) { strbuf_addstr(buf, ", "); strbuf_humanise_bytes(buf, total); strbuf_addstr(buf, " | "); strbuf_humanise_bytes(buf, rate * 1024); strbuf_addstr(buf, "/s"); } void display_throughput(struct progress *progress, off_t total) { struct throughput *tp; uint64_t now_ns; unsigned int misecs, count, rate; struct strbuf buf = STRBUF_INIT; if (!progress) return; tp = progress->throughput; now_ns = getnanotime(); if (!tp) { progress->throughput = tp = calloc(1, sizeof(*tp)); if (tp) { tp->prev_total = tp->curr_total = total; tp->prev_ns = now_ns; } 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(&buf, total, rate); strncpy(tp->display, buf.buf, sizeof(tp->display)); strbuf_release(&buf); if (progress->last_value != -1 && progress_update) display(progress, progress->last_value, NULL); } int display_progress(struct progress *progress, unsigned n) { return progress ? display(progress, n, NULL) : 0; } struct progress *start_progress_delay(const char *title, unsigned total, unsigned percent_treshold, unsigned delay) { struct progress *progress = malloc(sizeof(*progress)); if (!progress) { /* unlikely, but here's a good fallback */ fprintf(stderr, "%s...\n", title); fflush(stderr); return NULL; } progress->title = title; progress->total = total; progress->last_value = -1; progress->last_percent = -1; progress->delayed_percent_treshold = percent_treshold; progress->delay = delay; progress->throughput = NULL; set_progress_signal(); return progress; } struct progress *start_progress(const char *title, unsigned total) { return start_progress_delay(title, total, 0, 0); } void stop_progress(struct progress **p_progress) { stop_progress_msg(p_progress, _("done")); } void stop_progress_msg(struct progress **p_progress, const char *msg) { struct progress *progress = *p_progress; if (!progress) return; *p_progress = NULL; if (progress->last_value != -1) { /* Force the last update */ char buf[128], *bufp; size_t len = strlen(msg) + 5; struct throughput *tp = progress->throughput; bufp = (len < sizeof(buf)) ? buf : xmalloc(len + 1); if (tp) { struct strbuf strbuf = STRBUF_INIT; unsigned int rate = !tp->avg_misecs ? 0 : tp->avg_bytes / tp->avg_misecs; throughput_string(&strbuf, tp->curr_total, rate); strncpy(tp->display, strbuf.buf, sizeof(tp->display)); strbuf_release(&strbuf); } progress_update = 1; sprintf(bufp, ", %s.\n", msg); display(progress, progress->last_value, bufp); if (buf != bufp) free(bufp); } clear_progress_signal(); free(progress->throughput); free(progress); }