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ww: preserve compiler sink outputs

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Hojun-Cho
2026-08-14 19:10:36 +09:00
parent 763bbc8f25
commit 25da54936d
3 changed files with 84 additions and 16 deletions
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48
cmd/w6c/main.c
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@@ -13,6 +13,7 @@ struct publication {
char *backup;
int had_old;
int installed;
int passthrough;
};
static char *
@@ -30,9 +31,37 @@ publish_path(const char *dst, const char *kind)
return p;
}
static int
copy_stream(FILE *src, FILE *out)
{
int bad = fflush(src) != 0 || fseek(src, 0, SEEK_SET) != 0;
unsigned char buf[65536];
while (!bad) {
size_t n = fread(buf, 1, sizeof buf, src);
if (n != 0 && fwrite(buf, 1, n, out) != n) bad = 1;
if (n < sizeof buf) {
if (ferror(src)) bad = 1;
break;
}
}
return bad ? -1 : 0;
}
static int
materialize_stream(FILE *src, struct publication *p)
{
struct stat st;
if (lstat(p->dst, &st) == 0 && S_ISCHR(st.st_mode)) {
FILE *out = fopen(p->dst, "wb");
int bad = out == NULL || copy_stream(src, out) < 0;
if (out != NULL && fclose(out) != 0) bad = 1;
if (bad) {
fprintf(stderr, "w6c: cannot write %s\n", p->dst);
return -1;
}
p->passthrough = 1;
return 0;
}
p->stage = publish_path(p->dst, "new");
p->backup = publish_path(p->dst, "old");
if (p->stage == NULL || p->backup == NULL) {
@@ -50,16 +79,7 @@ materialize_stream(FILE *src, struct publication *p)
unlink(p->stage);
return -1;
}
int bad = fflush(src) != 0 || fseek(src, 0, SEEK_SET) != 0;
unsigned char buf[65536];
while (!bad) {
size_t n = fread(buf, 1, sizeof buf, src);
if (n != 0 && fwrite(buf, 1, n, out) != n) bad = 1;
if (n < sizeof buf) {
if (ferror(src)) bad = 1;
break;
}
}
int bad = copy_stream(src, out) < 0;
if (fclose(out) != 0) bad = 1;
if (bad) {
unlink(p->stage);
@@ -100,6 +120,7 @@ static int
publish_all(struct publication *p, int n)
{
for (int i = 0; i < n; i++) {
if (p[i].passthrough) continue;
if (!path_is_regular_nofollow(p[i].stage)) {
fprintf(stderr, "w6c: publication stage is not a regular file for %s\n",
p[i].dst);
@@ -120,6 +141,7 @@ publish_all(struct publication *p, int n)
}
}
for (int i = 0; i < n; i++) {
if (p[i].passthrough) continue;
int exists = path_exists_nofollow(p[i].backup);
if (exists != 0) {
if (exists < 0)
@@ -132,6 +154,7 @@ publish_all(struct publication *p, int n)
}
}
for (int i = 0; i < n; i++) {
if (p[i].passthrough) continue;
if (rename(p[i].dst, p[i].backup) == 0)
p[i].had_old = 1;
else if (errno != ENOENT) {
@@ -140,6 +163,7 @@ publish_all(struct publication *p, int n)
}
}
for (int i = 0; i < n; i++) {
if (p[i].passthrough) continue;
if (rename(p[i].stage, p[i].dst) != 0) {
fprintf(stderr, "w6c: cannot publish %s\n", p[i].dst);
goto rollback;
@@ -149,13 +173,15 @@ publish_all(struct publication *p, int n)
/* Installation is the commit point. Backup cleanup cannot truthfully
* turn a completely installed pair into a rejected compilation. */
for (int i = 0; i < n; i++)
if (p[i].had_old && unlink(p[i].backup) != 0) {
if (!p[i].passthrough && p[i].had_old
&& unlink(p[i].backup) != 0) {
fprintf(stderr, "w6c: cannot remove backup for %s\n", p[i].dst);
}
return 0;
rollback:
for (int i = n - 1; i >= 0; i--) {
if (p[i].passthrough) continue;
if (p[i].installed) (void)unlink(p[i].dst);
if (p[i].had_old) (void)rename(p[i].backup, p[i].dst);
if (p[i].stage != NULL) (void)unlink(p[i].stage);