apk: implement --progress-fd to write progress to a specified fd

src/apk.c

@@ -48,6 +48,7 @@ static struct apk_option generic_options[] = {
 	{ 'f', "force",		"Do what was asked even if it looks dangerous" },
 	{ 'U', "update-cache",	"Update the repository cache" },
 	{ 0x101, "progress",	"Show a progress bar" },
+	{ 0x10f, "progress-fd",	"Write progress to fd", required_argument, "FD" },
 	{ 0x110, "no-progress",	"Disable progress bar even for TTYs" },
 	{ 0x102, "clean-protected", "Do not create .apk-new files to "
 				"configuration dirs" },
@@ -265,6 +266,7 @@ static void setup_terminal(void)
 {
 	setvbuf(stderr, NULL, _IOLBF, BUFSIZ);
 	signal(SIGWINCH, on_sigwinch);
+	signal(SIGPIPE, SIG_IGN);
 }
 
 static void setup_automatic_flags(void)
@@ -383,6 +385,9 @@ int main(int argc, char **argv)
 		case 0x110:
 			apk_flags &= ~APK_PROGRESS;
 			break;
+		case 0x10f:
+			dbopts.progress_fd = atoi(optarg);
+			break;
 		case 0x102:
 			apk_flags |= APK_CLEAN_PROTECTED;
 			break;

src/apk_database.h

@@ -108,7 +108,7 @@ struct apk_repository_list {
 };
 
 struct apk_db_options {
-	int lock_wait;
+	int lock_wait, progress_fd;
 	unsigned long open_flags;
 	char *root;
 	char *arch;
@@ -127,7 +127,7 @@ struct apk_repository_tag {
 
 struct apk_database {
 	char *root;
-	int root_fd, lock_fd, cache_fd, cachetmp_fd, keys_fd;
+	int root_fd, lock_fd, cache_fd, cachetmp_fd, keys_fd, progress_fd;
 	unsigned num_repos, num_repo_tags;
 	const char *cache_dir;
 	char *cache_remount_dir;

src/database.c

@@ -1359,6 +1359,7 @@ int apk_db_open(struct apk_database *db, struct apk_db_options *dbopts)
 	int r, fd, write_arch = FALSE;
 
 	memset(db, 0, sizeof(*db));
+	db->progress_fd = dbopts->progress_fd;
 	if (apk_flags & APK_SIMULATE) {
 		dbopts->open_flags &= ~(APK_OPENF_CREATE | APK_OPENF_WRITE);
 		dbopts->open_flags |= APK_OPENF_READ;

src/solver.c

@@ -10,6 +10,7 @@
  */
 
 #include <stdint.h>
+#include <unistd.h>
 #include "apk_defines.h"
 #include "apk_database.h"
 #include "apk_package.h"
@@ -1650,23 +1651,34 @@ struct progress {
 	struct apk_stats done;
 	struct apk_stats total;
 	struct apk_package *pkg;
-	size_t count;
+	size_t percent;
+	int progress_fd;
 };
 
-static void progress_cb(void *ctx, size_t progress)
+static void update_progress(struct progress *prog, size_t percent)
+{
+	if (prog->percent == percent)
+		return;
+	prog->percent = percent;
+	if (apk_flags & APK_PROGRESS)
+		draw_progress(percent);
+	if (prog->progress_fd != 0) {
+		char buf[8];
+		size_t n = snprintf(buf, sizeof(buf), "%d\n", percent);
+		write(prog->progress_fd, buf, n);
+	}
+}
+
+static void progress_cb(void *ctx, size_t pkg_percent)
 {
 	struct progress *prog = (struct progress *) ctx;
-	size_t partial = 0, count;
+	size_t partial = 0, percent;
 
 	if (prog->pkg != NULL)
-		partial = muldiv(progress, prog->pkg->installed_size, APK_PROGRESS_SCALE);
-
-        count = muldiv(100, prog->done.bytes + prog->done.packages + partial,
-		       prog->total.bytes + prog->total.packages);
-
-	if (prog->count != count)
-		draw_progress(count);
-	prog->count = count;
+		partial = muldiv(pkg_percent, prog->pkg->installed_size, APK_PROGRESS_SCALE);
+	percent = muldiv(100, prog->done.bytes + prog->done.packages + partial,
+			 prog->total.bytes + prog->total.packages);
+	update_progress(prog, percent);
 }
 
 static int dump_packages(struct apk_changeset *changeset,
@@ -1784,6 +1796,7 @@ int apk_solver_commit_changeset(struct apk_database *db,
 
 	/* Count what needs to be done */
 	memset(&prog, 0, sizeof(prog));
+	prog.progress_fd = db->progress_fd;
 	for (i = 0; i < changeset->changes->num; i++) {
 		change = &changeset->changes->item[i];
 		count_change(change, &prog.total);
@@ -1831,17 +1844,15 @@ int apk_solver_commit_changeset(struct apk_database *db,
 		change = &changeset->changes->item[i];
 
 		print_change(db, change, i, changeset->changes->num);
-		if (apk_flags & APK_PROGRESS)
-			draw_progress(prog.count);
 		prog.pkg = change->newpkg;
+		progress_cb(&prog, 0);
 
 		if (!(apk_flags & APK_SIMULATE)) {
 			if (change->oldpkg != change->newpkg ||
 			    (change->reinstall && pkg_available(db, change->newpkg)))
 				r = apk_db_install_pkg(db,
 						       change->oldpkg, change->newpkg,
-						       (apk_flags & APK_PROGRESS) ? progress_cb : NULL,
-						       &prog);
+						       progress_cb, &prog);
 			if (r != 0)
 				break;
 			if (change->newpkg)
@@ -1850,8 +1861,7 @@ int apk_solver_commit_changeset(struct apk_database *db,
 
 		count_change(change, &prog.done);
 	}
-	if (apk_flags & APK_PROGRESS)
-		draw_progress(100);
+	update_progress(&prog, 100);
 
 	run_triggers(db);