gopack: omit time stamps

This makes it possible to build a package twice
and get the same bytes both times.

R=r, dsymonds, r2
CC=golang-dev
https://golang.org/cl/4248077

diff --git a/src/cmd/gopack/ar.c b/src/cmd/gopack/ar.c
index a7e2c41afdc9742fc3038b1af0a213cd43e26e9b..4c241358d4687530361c97d048ae9af6d5f65d4d 100644 (file)
--- a/src/cmd/gopack/ar.c
+++ b/src/cmd/gopack/ar.c
@@ -430,7 +430,7 @@ xcmd(char *arname, int count, char **files)
                                arcopy(&bar, 0, bp);
                                if (write(f, bp->member, bp->size) < 0)
                                        wrerr();
-                               if(oflag) {
+                               if(oflag && bp->date != 0) {
                                        nulldir(&dx);
                                        dx.atime = bp->date;
                                        dx.mtime = bp->date;
@@ -1022,7 +1022,7 @@ armove(Biobuf *b, Arfile *ap, Armember *bp)
        for (cp = strchr(bp->hdr.name, 0);              /* blank pad on right */
                cp < bp->hdr.name+sizeof(bp->hdr.name); cp++)
                        *cp = ' ';
-       sprint(bp->hdr.date, "%-12ld", d->mtime);
+       sprint(bp->hdr.date, "%-12ld", 0);  // was d->mtime but removed for idempotent builds
        sprint(bp->hdr.uid, "%-6d", 0);
        sprint(bp->hdr.gid, "%-6d", 0);
        sprint(bp->hdr.mode, "%-8lo", d->mode);
@@ -1125,7 +1125,7 @@ rl(int fd)
        len = symdefsize;
        if(len&01)
                len++;
-       sprint(a.date, "%-12ld", time(0));
+       sprint(a.date, "%-12ld", 0);  // time(0)
        sprint(a.uid, "%-6d", 0);
        sprint(a.gid, "%-6d", 0);
        sprint(a.mode, "%-8lo", 0644L);
@@ -1162,7 +1162,7 @@ rl(int fd)
 
        if (gflag) {
                len = pkgdefsize;
-               sprint(a.date, "%-12ld", time(0));
+               sprint(a.date, "%-12ld", 0);  // time(0)
                sprint(a.uid, "%-6d", 0);
                sprint(a.gid, "%-6d", 0);
                sprint(a.mode, "%-8lo", 0644L);