From ed1a6b7c93f47cbe433622f4b7881f421511f39f Mon Sep 17 00:00:00 2001
From: Aleksey Veresov <aleksey@veresov.pro>
Date: Tue, 1 Dec 2020 21:24:20 +0300
Subject: .

---
 default.do    |   4 +
 index.html.st |   2 +-
 redo.c        | 994 ----------------------------------------------------------
 3 files changed, 5 insertions(+), 995 deletions(-)
 delete mode 100644 redo.c

diff --git a/default.do b/default.do
index c137f41..8e378be 100644
--- a/default.do
+++ b/default.do
@@ -1,2 +1,6 @@
+if [[ $$2 =~ \.st$ ]]
+then
+    exit 0
+fi
 deps=$( { shelter.sh $2.st >$2; } 3>&1)
 redo-ifchange ${deps}
diff --git a/index.html.st b/index.html.st
index a0fb7e1..a390332 100644
--- a/index.html.st
+++ b/index.html.st
@@ -1,5 +1,5 @@
 $( {
     title="Welcome"
-    content="Hello, World!"
+    content="Hello, World."
     shelter.sh main.st
 } )
diff --git a/redo.c b/redo.c
deleted file mode 100644
index 6f2f9d3..0000000
--- a/redo.c
+++ /dev/null
@@ -1,994 +0,0 @@
-/* An implementation of the redo build system
-   in portable C with zero dependencies
-
-   http://cr.yp.to/redo.html
-   https://jdebp.eu./FGA/introduction-to-redo.html
-   https://github.com/apenwarr/redo/blob/master/README.md
-   http://news.dieweltistgarnichtso.net/bin/redo-sh.html
-
-   To the extent possible under law,
-   Leah Neukirchen <leah@vuxu.org>
-   has waived all copyright and related or neighboring rights to this work.
-
-   http://creativecommons.org/publicdomain/zero/1.0/
-*/
-
-/*
-##% cc -g -Os -Wall -Wextra -Wwrite-strings -o $STEM $FILE
-*/
-
-/*
-current bugs:
-  dependency-loop: unlimited recursion
-    need locks
-
-todo:
-  test job server properly
-*/
-
-#include <sys/param.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-
-#include <errno.h>
-#include <fcntl.h>
-#include <inttypes.h>
-#include <stdarg.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-// ---------------------------------------------------------------------------
-// from musl/src/crypt/crypt_sha256.c
-
-/* public domain sha256 implementation based on fips180-3 */
-
-struct sha256 {
-	uint64_t len;    /* processed message length */
-	uint32_t h[8];   /* hash state */
-	uint8_t buf[64]; /* message block buffer */
-};
-
-static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); }
-#define Ch(x,y,z)  (z ^ (x & (y ^ z)))
-#define Maj(x,y,z) ((x & y) | (z & (x | y)))
-#define S0(x)	   (ror(x,2) ^ ror(x,13) ^ ror(x,22))
-#define S1(x)	   (ror(x,6) ^ ror(x,11) ^ ror(x,25))
-#define R0(x)	   (ror(x,7) ^ ror(x,18) ^ (x>>3))
-#define R1(x)	   (ror(x,17) ^ ror(x,19) ^ (x>>10))
-
-static const uint32_t K[64] = {
-0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
-0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
-0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
-0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
-0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
-0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
-0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
-0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
-};
-
-static void processblock(struct sha256 *s, const uint8_t *buf)
-{
-	uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
-	int i;
-
-	for (i = 0; i < 16; i++) {
-		W[i] = (uint32_t)buf[4*i]<<24;
-		W[i] |= (uint32_t)buf[4*i+1]<<16;
-		W[i] |= (uint32_t)buf[4*i+2]<<8;
-		W[i] |= buf[4*i+3];
-	}
-	for (; i < 64; i++)
-		W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
-	a = s->h[0];
-	b = s->h[1];
-	c = s->h[2];
-	d = s->h[3];
-	e = s->h[4];
-	f = s->h[5];
-	g = s->h[6];
-	h = s->h[7];
-	for (i = 0; i < 64; i++) {
-		t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
-		t2 = S0(a) + Maj(a, b, c);
-		h = g;
-		g = f;
-		f = e;
-		e = d + t1;
-		d = c;
-		c = b;
-		b = a;
-		a = t1 + t2;
-	}
-	s->h[0] += a;
-	s->h[1] += b;
-	s->h[2] += c;
-	s->h[3] += d;
-	s->h[4] += e;
-	s->h[5] += f;
-	s->h[6] += g;
-	s->h[7] += h;
-}
-
-static void pad(struct sha256 *s)
-{
-	unsigned r = s->len % 64;
-
-	s->buf[r++] = 0x80;
-	if (r > 56) {
-		memset(s->buf + r, 0, 64 - r);
-		r = 0;
-		processblock(s, s->buf);
-	}
-	memset(s->buf + r, 0, 56 - r);
-	s->len *= 8;
-	s->buf[56] = s->len >> 56;
-	s->buf[57] = s->len >> 48;
-	s->buf[58] = s->len >> 40;
-	s->buf[59] = s->len >> 32;
-	s->buf[60] = s->len >> 24;
-	s->buf[61] = s->len >> 16;
-	s->buf[62] = s->len >> 8;
-	s->buf[63] = s->len;
-	processblock(s, s->buf);
-}
-
-static void sha256_init(struct sha256 *s)
-{
-	s->len = 0;
-	s->h[0] = 0x6a09e667;
-	s->h[1] = 0xbb67ae85;
-	s->h[2] = 0x3c6ef372;
-	s->h[3] = 0xa54ff53a;
-	s->h[4] = 0x510e527f;
-	s->h[5] = 0x9b05688c;
-	s->h[6] = 0x1f83d9ab;
-	s->h[7] = 0x5be0cd19;
-}
-
-static void sha256_sum(struct sha256 *s, uint8_t *md)
-{
-	int i;
-
-	pad(s);
-	for (i = 0; i < 8; i++) {
-		md[4*i] = s->h[i] >> 24;
-		md[4*i+1] = s->h[i] >> 16;
-		md[4*i+2] = s->h[i] >> 8;
-		md[4*i+3] = s->h[i];
-	}
-}
-
-static void sha256_update(struct sha256 *s, const void *m, unsigned long len)
-{
-	const uint8_t *p = m;
-	unsigned r = s->len % 64;
-
-	s->len += len;
-	if (r) {
-		if (len < 64 - r) {
-			memcpy(s->buf + r, p, len);
-			return;
-		}
-		memcpy(s->buf + r, p, 64 - r);
-		len -= 64 - r;
-		p += 64 - r;
-		processblock(s, s->buf);
-	}
-	for (; len >= 64; len -= 64, p += 64)
-		processblock(s, p);
-	memcpy(s->buf, p, len);
-}
-
-// ----------------------------------------------------------------------
-
-int dir_fd = -1;
-int dep_fd = -1;
-int poolwr_fd = -1;
-int poolrd_fd = -1;
-int level = -1;
-int implicit_jobs = 1;
-int kflag, jflag, xflag, fflag, sflag;
-
-static void
-redo_ifcreate(int fd, char *target)
-{
-	dprintf(fd, "-%s\n", target);
-}
-
-static char *
-check_dofile(const char *fmt, ...)
-{
-	static char dofile[PATH_MAX];
-
-	va_list ap;
-	va_start(ap, fmt);
-	vsnprintf(dofile, sizeof dofile, fmt, ap);
-	va_end(ap);
-
-	if (access(dofile, F_OK) == 0) {
-		return dofile;
-	} else {
-		redo_ifcreate(dep_fd, dofile);
-		return 0;
-	}
-}
-
-/*
-dir/base.a.b
-	will look for dir/base.a.b.do,
-	dir/default.a.b.do, dir/default.b.do, dir/default.do,
-	default.a.b.do, default.b.do, and default.do.
-
-this function assumes no / in target
-*/
-static char *
-find_dofile(char *target)
-{
-	char updir[PATH_MAX];
-	char *u = updir;
-	char *dofile, *s;
-	struct stat st, ost;
-
-	dofile = check_dofile("./%s.do", target);
-	if (dofile)
-		return dofile;
-
-	*u++ = '.';
-	*u++ = '/';
-	*u = 0;
-
-	st.st_dev = ost.st_dev = st.st_ino = ost.st_ino = 0;
-
-	while (1) {
-		ost = st;
-
-		if (stat(updir, &st) < 0)
-			return 0;
-		if (ost.st_dev == st.st_dev && ost.st_ino == st.st_ino)
-			break;  // reached root dir, .. = .
-
-		s = target;
-		while (*s) {
-			if (*s++ == '.') {
-				dofile = check_dofile("%sdefault.%s.do", updir, s);
-				if (dofile)
-					return dofile;
-			}
-		}
-
-		dofile = check_dofile("%sdefault.do", updir);
-		if (dofile)
-			return dofile;
-
-		*u++ = '.';
-		*u++ = '.';
-		*u++ = '/';
-		*u = 0;
-	}
-
-	return 0;
-}
-
-static int
-envfd(const char *name)
-{
-	long fd;
-
-	char *s = getenv(name);
-	if (!s)
-		return -1;
-
-	fd = strtol(s, 0, 10);
-	if (fd < 0 || fd > 255)
-		fd = -1;
-
-	return fd;
-}
-
-static void
-setenvfd(const char *name, int i)
-{
-	char buf[16];
-	snprintf(buf, sizeof buf, "%d", i);
-	setenv(name, buf, 1);
-}
-
-static char *
-hashfile(int fd)
-{
-	static char hex[16] = "0123456789abcdef";
-	static char asciihash[65];
-
-	struct sha256 ctx;
-	off_t off = 0;
-	char buf[4096];
-	char *a;
-	unsigned char hash[32];
-	int i;
-	ssize_t r;
-
-	sha256_init(&ctx);
-
-	while ((r = pread(fd, buf, sizeof buf, off)) > 0) {
-		sha256_update(&ctx, buf, r);
-		off += r;
-	}
-
-	sha256_sum(&ctx, hash);
-
-	for (i = 0, a = asciihash; i < 32; i++) {
-		*a++ = hex[hash[i] / 16];
-		*a++ = hex[hash[i] % 16];
-	}
-	*a = 0;
-
-	return asciihash;
-}
-
-static char *
-datefile(int fd)
-{
-	static char hexdate[17];
-	struct stat st;
-
-	fstat(fd, &st);
-	snprintf(hexdate, sizeof hexdate, "%016" PRIx64, st.st_ctime);
-
-	return hexdate;
-}
-
-static int
-keepdir()
-{
-	int fd = open(".", O_RDONLY | O_DIRECTORY | O_CLOEXEC);
-	if (fd < 0) {
-		perror("dir open");
-		exit(-1);
-	}
-	return fd;
-}
-
-static char *
-targetchdir(char *target)
-{
-	char *base = strrchr(target, '/');
-	if (base) {
-		int fd;
-		*base = 0;
-		fd = openat(dir_fd, target, O_RDONLY | O_DIRECTORY);
-		if (fd < 0) {
-			perror("openat dir");
-			exit(111);
-		}
-		*base = '/';
-		if (fchdir(fd) < 0) {
-			perror("chdir");
-			exit(111);
-		}
-		close(fd);
-		return base+1;
-	} else {
-		fchdir(dir_fd);
-		return target;
-	}
-}
-
-static char *
-targetdep(char *target)
-{
-	static char buf[PATH_MAX];
-	snprintf(buf, sizeof buf, ".dep.%s", target);
-	return buf;
-}
-
-static char *
-targetlock(char *target)
-{
-	static char buf[PATH_MAX];
-	snprintf(buf, sizeof buf, ".lock.%s", target);
-	return buf;
-}
-
-static int
-sourcefile(char *target)
-{
-	target = targetchdir(target);
-	return access(target, F_OK) == 0 && access(targetdep(target), F_OK) != 0;
-}
-
-static int
-check_deps(char *target)
-{
-	char *depfile;
-	FILE *f;
-	int ok = 1;
-	int fd;
-	int old_dir_fd = dir_fd;
-
-	target = targetchdir(target);
-
-	depfile = targetdep(target);
-	f = fopen(depfile, "r");
-	if (!f)
-		return 0;
-
-	dir_fd = keepdir();
-
-	while (ok && !feof(f)) {
-		char line[4096];
-		char *hash = line + 1;
-		char *timestamp = line + 1 + 64 + 1;
-		char *filename = line + 1 + 64 + 1 + 16 + 1;
-
-		if (fgets(line, sizeof line, f)) {
-			line[strlen(line)-1] = 0; // strip \n
-			switch (line[0]) {
-			case '-':  // must not exist
-				if (access(line+1, F_OK) == 0)
-					ok = 0;
-				break;
-			case '=':  // compare hash
-				fd = open(filename, O_RDONLY);
-				if (fd < 0) {
-					ok = 0;
-				} else {
-					if (strncmp(timestamp, datefile(fd), 16) != 0 &&
-					    strncmp(hash, hashfile(fd), 64) != 0)
-						ok = 0;
-					close(fd);
-				}
-				// hash is good, recurse into dependencies
-				if (ok && strcmp(target, filename) != 0) {
-					if (!sourcefile(filename))
-						ok = check_deps(filename);
-					fchdir(dir_fd);
-				}
-				break;
-			case '!':  // always rebuild
-			default:  // dep file broken, lets recreate it
-				ok = 0;
-			}
-		} else {
-			if (!feof(f)) {
-				ok = 0;
-				break;
-			}
-		}
-	}
-
-	fclose(f);
-
-	close(dir_fd);
-	dir_fd = old_dir_fd;
-
-	return ok;
-}
-
-void
-vacate(int implicit)
-{
-	if (implicit)
-		implicit_jobs++;
-	else
-		write(poolwr_fd, "\0", 1);
-}
-
-struct job {
-	struct job *next;
-	pid_t pid;
-	int lock_fd;
-	char *target, *temp_depfile, *temp_target;
-	int implicit;
-};
-struct job *jobhead;
-
-static void
-insert_job(struct job *job)
-{
-	job->next = jobhead;
-	jobhead = job;
-}
-
-static void
-remove_job(struct job *job)
-{
-	if (jobhead == job)
-		jobhead = jobhead->next;
-	else {
-		struct job *j = jobhead;
-		while (j->next != job)
-			j = j->next;
-		j->next = j->next->next;
-	}
-}
-
-static struct job *
-find_job(pid_t pid)
-{
-	struct job *j;
-
-	for (j = jobhead; j; j = j->next) {
-		if (j->pid == pid)
-			return j;
-	}
-
-	return 0;
-}
-
-char uprel[PATH_MAX];
-
-void
-compute_uprel()
-{
-	char *u = uprel;
-	char *dp = getenv("REDO_DIRPREFIX");
-
-	*u = 0;
-	while (dp && *dp) {
-		*u++ = '.';
-		*u++ = '.';
-		*u++ = '/';
-		*u = 0;
-		dp = strchr(dp + 1, '/');
-	}
-}
-
-static int
-write_dep(int dep_fd, char *file)
-{
-	int fd = open(file, O_RDONLY);
-	if (fd < 0)
-		return 0;
-	dprintf(dep_fd, "=%s %s %s%s\n",
-	    hashfile(fd), datefile(fd), (*file == '/' ? "" : uprel), file);
-	close(fd);
-	return 0;
-}
-
-int
-new_waitjob(int lock_fd, int implicit)
-{
-	pid_t pid;
-
-	pid = fork();
-	if (pid < 0) {
-		perror("fork");
-		vacate(implicit);
-		exit(-1);
-	} else if (pid == 0) { // child
-		lockf(lock_fd, F_LOCK, 0);
-		close(lock_fd);
-		exit(0);
-	} else {
-		struct job *job = malloc(sizeof *job);
-		if (!job)
-			exit(-1);
-		job->target = 0;
-		job->pid = pid;
-		job->lock_fd = lock_fd;
-		job->implicit = implicit;
-
-		insert_job(job);
-	}
-
-	return 0;
-}
-
-// dofile doesn't contain /
-// target can contain /
-static char *
-redo_basename(char *dofile, char *target)
-{
-	static char buf[PATH_MAX];
-	int stripext = 0;
-	char *s;
-
-	if (strncmp(dofile, "default.", 8) == 0)
-		for (stripext = -1, s = dofile; *s; s++)
-			if (*s == '.')
-				stripext++;
-
-	strncpy(buf, target, sizeof buf);
-	while (stripext-- > 0) {
-		if (strchr(buf, '.')) {
-			char *e = strchr(buf, '\0');
-			while (*--e != '.')
-				*e = 0;
-			*e = 0;
-		}
-	}
-
-	return buf;
-}
-
-static void
-run_script(char *target, int implicit)
-{
-	char temp_depfile[] = ".depend.XXXXXX";
-	char temp_target_base[] = ".target.XXXXXX";
-	char temp_target[PATH_MAX], rel_target[PATH_MAX], cwd[PATH_MAX];
-	char *orig_target = target;
-	int old_dep_fd = dep_fd;
-	int target_fd;
-	char *dofile, *dirprefix;
-	pid_t pid;
-
-	target = targetchdir(target);
-
-	int lock_fd = open(targetlock(target),
-	    O_WRONLY | O_TRUNC | O_CREAT, 0666);
-	if (lockf(lock_fd, F_TLOCK, 0) < 0) {
-		if (errno == EAGAIN) {
-			fprintf(stderr, "redo: %s already building, waiting.\n",
-			    orig_target);
-			new_waitjob(lock_fd, implicit);
-			return;
-		} else {
-			perror("lockf");
-			exit(111);
-		}
-	}
-
-	dep_fd = mkstemp(temp_depfile);
-
-	target_fd = mkstemp(temp_target_base);
-
-	dofile = find_dofile(target);
-	if (!dofile) {
-		fprintf(stderr, "no dofile for %s.\n", target);
-		exit(1);
-	}
-
-	fprintf(stderr, "redo%*.*s %s # %s\n", level*2, level*2, " ", orig_target, dofile);
-	write_dep(dep_fd, dofile);
-
-	// .do files are called from the directory they reside in, we need to
-	// prefix the arguments with the path from the dofile to the target
-	getcwd(cwd, sizeof cwd);
-	dirprefix = strchr(cwd, '\0');
-	dofile += 2;  // find_dofile starts with ./ always
-	while (strncmp(dofile, "../", 3) == 0) {
-		chdir("..");
-		dofile += 3;
-		while (*--dirprefix != '/')
-			;
-	}
-	if (*dirprefix)
-		dirprefix++;
-
-	snprintf(temp_target, sizeof temp_target,
-	    "%s%s%s", dirprefix, "/"+(*dirprefix ? 0 : 1), temp_target_base);
-	snprintf(rel_target, sizeof rel_target,
-	    "%s%s%s", dirprefix, "/"+(*dirprefix ? 0 : 1), target);
-
-	if (dirprefix)
-		setenv("REDO_DIRPREFIX", dirprefix, 1);
-	else
-		unsetenv("REDO_DIRPREFIX");
-
-	pid = fork();
-	if (pid < 0) {
-		perror("fork");
-		vacate(implicit);
-		exit(-1);
-	} else if (pid == 0) { // child
-/*
-djb-style default.o.do:
-   $1	   foo.o
-   $2	   foo
-   $3	   whatever.tmp
-
-   $1	   all
-   $2	   all (!!)
-   $3	   whatever.tmp
-
-   $1	   subdir/foo.o
-   $2	   subdir/foo
-   $3	   subdir/whatever.tmp
-*/
-		char *basename = redo_basename(dofile, rel_target);
-
-		if (old_dep_fd > 0)
-			close(old_dep_fd);
-		close(lock_fd);
-		setenvfd("REDO_DEP_FD", dep_fd);
-		setenvfd("REDO_LEVEL", level + 1);
-		if (sflag > 0)
-			dup2(target_fd, 1);
-		else
-			close(target_fd);
-
-		if (access(dofile, X_OK) != 0)   // run -x files with /bin/sh
-			execl("/bin/sh", "/bin/sh", xflag > 0 ? "-ex" : "-e",
-			    dofile, rel_target, basename, temp_target, (char *)0);
-		else
-			execl(dofile,
-			    dofile, rel_target, basename, temp_target, (char *)0);
-		vacate(implicit);
-		exit(-1);
-	} else {
-		struct job *job = malloc(sizeof *job);
-		if (!job)
-			exit(-1);
-
-		close(target_fd);
-		close(dep_fd);
-		dep_fd = old_dep_fd;
-
-		job->pid = pid;
-		job->lock_fd = lock_fd;
-		job->target = orig_target;
-		job->temp_depfile = strdup(temp_depfile);
-		job->temp_target = strdup(temp_target_base);
-		job->implicit = implicit;
-
-		insert_job(job);
-	}
-}
-
-static int
-try_procure()
-{
-	if (implicit_jobs > 0) {
-		implicit_jobs--;
-		return 1;
-	} else {
-		if (poolrd_fd < 0)
-			return 0;
-
-		fcntl(poolrd_fd, F_SETFL, O_NONBLOCK);
-
-		char buf[1];
-		return read(poolrd_fd, &buf, 1) > 0;
-	}
-}
-
-static int
-procure()
-{
-	if (implicit_jobs > 0) {
-		implicit_jobs--;
-		return 1;
-	} else {
-		fcntl(poolrd_fd, F_SETFL, 0);   // clear O_NONBLOCK
-
-		char buf[1];
-		return read(poolrd_fd, &buf, 1) > 0;
-	}
-}
-
-void
-create_pool()
-{
-	poolrd_fd = envfd("REDO_RD_FD");
-	poolwr_fd = envfd("REDO_WR_FD");
-	if (poolrd_fd < 0 || poolwr_fd < 0) {
-		int jobs = envfd("JOBS");
-		if (jobs > 1) {
-			int i, fds[2];
-			pipe(fds);
-			poolrd_fd = fds[0];
-			poolwr_fd = fds[1];
-
-			for (i = 0; i < jobs-1; i++)
-				vacate(0);
-
-			setenvfd("REDO_RD_FD", poolrd_fd);
-			setenvfd("REDO_WR_FD", poolwr_fd);
-		} else {
-			poolrd_fd = -1;
-			poolwr_fd = -1;
-		}
-	}
-}
-
-static void
-redo_ifchange(int targetc, char *targetv[])
-{
-	pid_t pid;
-	int status;
-	struct job *job;
-
-	int targeti = 0;
-
-	// XXX
-	char skip[targetc];
-
-	create_pool();
-
-	// check all targets whether needing rebuild
-	for (targeti = 0; targeti < targetc; targeti++)
-		skip[targeti] = fflag > 0 ? 0 : check_deps(targetv[targeti]);
-
-	targeti = 0;
-	while (1) {
-		int procured = 0;
-		if (targeti < targetc) {
-			char *target = targetv[targeti];
-
-			if (skip[targeti] || sourcefile(target)) {
-				targeti++;
-				continue;
-			}
-
-			int implicit = implicit_jobs > 0;
-			if (try_procure()) {
-				procured = 1;
-				targeti++;
-				run_script(target, implicit);
-			}
-		}
-
-		pid = waitpid(-1, &status, procured ? WNOHANG : 0);
-
-		if (pid == 0)
-			continue;  // nohang
-
-		if (pid < 0) {
-			if (errno == ECHILD && targeti < targetc)
-				continue;   // no child yet???
-			else
-				break;   // no child left
-		}
-
-		if (WIFEXITED(status))
-			status = WEXITSTATUS(status);
-
-		job = find_job(pid);
-
-		if (!job) {
-			exit(-1);
-		}
-		remove_job(job);
-
-		if (job->target) {
-			if (status > 0) {
-				remove(job->temp_depfile);
-				remove(job->temp_target);
-			} else {
-				struct stat st;
-				char *target = targetchdir(job->target);
-				char *depfile = targetdep(target);
-				int dfd;
-
-				dfd = open(job->temp_depfile,
-				    O_WRONLY | O_APPEND);
-				if (stat(job->temp_target, &st) == 0) {
-					rename(job->temp_target, target);
-					write_dep(dfd, target);
-				} else {
-					remove(job->temp_target);
-					redo_ifcreate(dfd, target);
-				}
-				close(dfd);
-
-				rename(job->temp_depfile, depfile);
-				remove(targetlock(target));
-			}
-		}
-
-		close(job->lock_fd);
-
-		vacate(job->implicit);
-
-		if (kflag < 0 && status > 0) {
-			printf("failed with status %d\n", status);
-			exit(status);
-		}
-	}
-}
-
-static void
-record_deps(int targetc, char *targetv[])
-{
-	int targeti = 0;
-	int fd;
-
-	dep_fd = envfd("REDO_DEP_FD");
-	if (dep_fd < 0)
-		return;
-
-	fchdir(dir_fd);
-	compute_uprel();
-
-	for (targeti = 0; targeti < targetc; targeti++) {
-		fd = open(targetv[targeti], O_RDONLY);
-		if (fd < 0)
-			continue;
-		write_dep(dep_fd, targetv[targeti]);
-		close(fd);
-	}
-}
-
-int
-main(int argc, char *argv[])
-{
-	char *program;
-	int opt, i;
-
-	dep_fd = envfd("REDO_DEP_FD");
-
-	level = envfd("REDO_LEVEL");
-	if (level < 0)
-		level = 0;
-
-	fflag = envfd("REDO_FORCE");
-	kflag = envfd("REDO_KEEP_GOING");
-	xflag = envfd("REDO_TRACE");
-	sflag = envfd("REDO_STDOUT");
-
-	if ((program = strrchr(argv[0], '/')))
-		program++;
-	else
-		program = argv[0];
-
-	while ((opt = getopt(argc, argv, "+kxfsj:C:")) != -1) {
-		switch (opt) {
-		case 'k':
-			kflag = 1;
-			setenvfd("REDO_KEEP_GOING", 1);
-			break;
-		case 'x':
-			xflag = 1;
-			setenvfd("REDO_TRACE", 1);
-			break;
-		case 'f':
-			fflag = 1;
-			setenvfd("REDO_FORCE", 1);
-			break;
-		case 's':
-			sflag = 1;
-			setenvfd("REDO_STDOUT", 1);
-			break;
-		case 'j':
-			setenv("JOBS", optarg, 1);
-			break;
-		case 'C':
-			if (chdir(optarg) < 0) {
-				perror("chdir");
-				exit(-1);
-			}
-			break;
-		default:
-			fprintf(stderr, "usage: %s [-kfsx] [-jN] [-Cdir] [TARGETS...]\n", program);
-			exit(1);
-		}
-	}
-	argc -= optind;
-	argv += optind;
-
-	if (argc == 0) {
-		argc = 1;
-		argv[0] = (char *)"all";    // XXX safe?
-	}
-
-	dir_fd = keepdir();
-
-	if (strcmp(program, "redo") == 0) {
-		fflag = 1;
-		redo_ifchange(argc, argv);
-		procure();
-	} else if (strcmp(program, "redo-ifchange") == 0) {
-		redo_ifchange(argc, argv);
-		record_deps(argc, argv);
-		procure();
-	} else if (strcmp(program, "redo-ifcreate") == 0) {
-		for (i = 0; i < argc; i++)
-			redo_ifcreate(dep_fd, argv[i]);
-	} else if (strcmp(program, "redo-always") == 0) {
-		dprintf(dep_fd, "!\n");
-	} else if (strcmp(program, "redo-hash") == 0) {
-		for (i = 0; i < argc; i++)
-			write_dep(1, argv[i]);
-	} else {
-		fprintf(stderr, "not implemented %s\n", program);
-		exit(-1);
-	}
-
-	return 0;
-}
-- 
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