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-rw-r--r--src/build.c108
1 files changed, 74 insertions, 34 deletions
diff --git a/src/build.c b/src/build.c
index cd6f8dc..d601e42 100644
--- a/src/build.c
+++ b/src/build.c
@@ -6,7 +6,7 @@
* of the MIT license. See the LICENSE file for details.
*/
-#define _XOPEN_SOURCE 600
+#define _XOPEN_SOURCE 700
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
@@ -17,6 +17,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
+#include <time.h>
#include <libgen.h> /* dirname(), basename() */
@@ -40,6 +41,7 @@ typedef struct dep_info {
const char *target;
char *path;
unsigned char *hash;
+ struct timespec ctime;
int32_t flags;
#define DEP_SOURCE (1 << 1)
} dep_info;
@@ -54,7 +56,7 @@ static char *get_dep_path(const char *target);
static void write_dep_information(dep_info *dep);
static int handle_ident(dep_info *dep, int ident);
static int handle_c(dep_info *dep);
-static unsigned char *hash_file(const char *target);
+static void update_dep_info(dep_info *dep, const char *target);
/* Build given target, using it's .do script. */
@@ -68,8 +70,8 @@ static int build_target(dep_info *dep) {
/* if our target file has no .do script associated but exists,
then we treat it as a source */
dep->flags |= DEP_SOURCE;
- if (!dep->hash)
- dep->hash = hash_file(dep->target);
+ if (!dep->hash) /* if the hash was retrieved, ctime was too */
+ update_dep_info(dep, dep->target);
write_dep_information(dep);
goto exit;
@@ -155,7 +157,7 @@ static int build_target(dep_info *dep) {
/* recalculate hash after successful build */
unsigned char *old_hash = dep->hash;
- dep->hash = hash_file(dep->target);
+ update_dep_info(dep, dep->target);
if (old_hash)
retval = memcmp(dep->hash, old_hash, 20);
@@ -174,7 +176,7 @@ static int build_target(dep_info *dep) {
};
if (!fexists(dep2.path)) {
- dep2.hash = hash_file(doscripts->chosen);
+ update_dep_info(&dep2, doscripts->chosen);
write_dep_information(&dep2);
free(dep2.hash);
}
@@ -369,11 +371,7 @@ void add_prereq(const char *target, const char *parent, int ident) {
}
/* Hash the target file, returning a pointer to the heap allocated hash. */
-static unsigned char *hash_file(const char *target) {
- FILE *in = fopen(target, "rb");
- if (!in)
- fatal("redo: failed to open %s", target);
-
+static unsigned char *hash_file(FILE *fp) {
unsigned char *hash = xmalloc(20);
SHA_CTX context;
@@ -381,17 +379,31 @@ static unsigned char *hash_file(const char *target) {
size_t read;
SHA1_Init(&context);
- while ((read = fread(data, 1, sizeof data, in)))
+ while ((read = fread(data, 1, sizeof data, fp)))
SHA1_Update(&context, data, read);
- if (ferror(in))
- fatal("redo: failed to read from %s", target);
+ if (ferror(fp))
+ fatal("redo: failed to read data");
SHA1_Final(hash, &context);
- fclose(in);
return hash;
}
+/* Update hash & ctime information stored in the given dep_info struct */
+static void update_dep_info(dep_info *dep, const char *target) {
+ FILE *fp = fopen(target, "rb");
+ if (!fp)
+ fatal("redo: failed to open %s", target);
+
+ dep->hash = hash_file(fp);
+ struct stat st;
+ if (fstat(fileno(fp), &st))
+ fatal("redo: failed to aquire stat() %s", target);
+
+ dep->ctime = st.st_ctim;
+ fclose(fp);
+}
+
static void sha1_to_hex(const unsigned char *sha1, char *buf) {
static const char hex[] = "0123456789abcdef";
@@ -422,7 +434,9 @@ static void write_dep_information(dep_info *dep) {
int magic = atoi(getenv("REDO_MAGIC"));
- if (fprintf(fd, "%s:%010u:%s\n", hash, magic, flags) < 0)
+ /* TODO: casting time_t to long long is probably not entirely portable */
+ if (fprintf(fd, "%s:%lld.%.9ld:%010u:%s\n", hash,
+ (long long)dep->ctime.tv_sec, dep->ctime.tv_nsec, magic, flags) < 0)
fatal("redo: failed to write to %s", dep->path);
if (fclose(fd))
@@ -459,8 +473,8 @@ static int handle_ident(dep_info *dep, int ident) {
}
static int handle_c(dep_info *dep) {
- FILE *fp = fopen(dep->path, "rb");
- if (!fp) {
+ FILE *pathfd = fopen(dep->path, "rb");
+ if (!pathfd) {
if (errno == ENOENT) {
/* dependency record does not exist */
return build_target(dep);
@@ -471,22 +485,25 @@ static int handle_c(dep_info *dep) {
int retval = 0;
struct dsv_ctx ctx;
- dsv_init(&ctx, 3);
+ dsv_init(&ctx, 4);
- if (dsv_parse_file(&ctx, fp)) {
+ if (dsv_parse_file(&ctx, pathfd)) {
retval = build_target(dep);
goto exit2;
}
errno = 0;
- long magic = strtol(ctx.fields[1], NULL, 10);
+ long magic = strtol(ctx.fields[2], NULL, 10);
if (errno) {
retval = build_target(dep);
goto exit;
}
- if (!fexists(dep->target)) {
- if (ctx.fields[2][0] == 's') {
+ FILE *targetfd = fopen(dep->target, "rb");
+ if (!targetfd) {
+ if (errno != ENOENT) {
+ fatal("redo: failed to open %s\n", dep->target);
+ } else if (ctx.fields[3][0] == 's') {
/* target is a source and must not be rebuild */
retval = 1;
goto exit;
@@ -498,30 +515,53 @@ static int handle_c(dep_info *dep) {
if (magic == atoi(getenv("REDO_MAGIC"))) {
/* magic number matches */
+ fclose(targetfd);
retval = 1;
goto exit;
}
- unsigned char old_hash[20];
- hex_to_sha1(ctx.fields[0], old_hash); /* TODO: error checking */
- dep->hash = hash_file(dep->target);
-
- if (memcmp(old_hash, dep->hash, 20)) {
+ struct stat curr_st;
+ if (sscanf(ctx.fields[1], "%lld.%ld", (long long*)&dep->ctime.tv_sec,
+ &dep->ctime.tv_nsec) < 2) {
+ fclose(targetfd);
retval = build_target(dep);
goto exit;
}
+ if (fstat(fileno(targetfd), &curr_st))
+ fatal("redo: failed to stat() %s", dep->target);
+
+ if (dep->ctime.tv_sec != curr_st.st_ctim.tv_sec
+ || dep->ctime.tv_nsec != curr_st.st_ctim.tv_nsec) {
+ /* ctime doesn't match */
+ dep->ctime = curr_st.st_ctim;
+
+ /* so check the hash */
+ unsigned char old_hash[20];
+ hex_to_sha1(ctx.fields[0], old_hash); /* TODO: error checking */
+ dep->hash = hash_file(targetfd);
+
+ if (memcmp(old_hash, dep->hash, 20)) {
+ fclose(targetfd);
+ retval = build_target(dep);
+ goto exit;
+ }
+
+ /* update ctime hash */
+ write_dep_information(dep);
+ }
+
for (size_t i = 0; i < ctx.fields_count; ++i)
free(ctx.fields[i]);
dsv_free(&ctx);
- fclose(fp);
-
+ fclose(targetfd);
+ fclose(pathfd);
char *prereq_path = concat(2, dep->path, ".prereq");
- fp = fopen(prereq_path, "rb");
+ pathfd = fopen(prereq_path, "rb");
free(prereq_path);
- if (!fp) {
+ if (!pathfd) {
if (errno == ENOENT)
return 0;
else
@@ -530,7 +570,7 @@ static int handle_c(dep_info *dep) {
dsv_init(&ctx, 2);
- while (!dsv_parse_file(&ctx, fp)) {
+ while (!dsv_parse_file(&ctx, pathfd)) {
char *target, *abs = NULL;
if (!is_absolute(ctx.fields[1])) {
abs = concat(3, getenv("REDO_ROOT"), "/", ctx.fields[1]);
@@ -557,7 +597,7 @@ exit:
free(ctx.fields[i]);
exit2:
dsv_free(&ctx);
- fclose(fp);
+ fclose(pathfd);
return retval;
}
generated by cgit v1.2.3-70-g09d2 (git 2.51.0) at 2025-11-03 23:56:27 +0000