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Diffstat (limited to 'src/cmd/gopack/ar.c')
-rw-r--r--src/cmd/gopack/ar.c177
1 files changed, 161 insertions, 16 deletions
diff --git a/src/cmd/gopack/ar.c b/src/cmd/gopack/ar.c
index a7e2c41af..dc3899f37 100644
--- a/src/cmd/gopack/ar.c
+++ b/src/cmd/gopack/ar.c
@@ -41,6 +41,7 @@
#include <libc.h>
#include <bio.h>
#include <mach.h>
+#include "../../libmach/obj.h"
#include <ar.h>
#undef select
@@ -123,6 +124,7 @@ int gflag;
int oflag;
int uflag;
int vflag;
+int Pflag; /* remove leading file prefix */
int Sflag; /* force mark Go package as safe */
int errors;
@@ -141,6 +143,7 @@ char poname[ARNAMESIZE+1]; /* name of pivot member */
char *file; /* current file or member being worked on */
Biobuf bout;
Biobuf bar;
+char *prefix;
void arcopy(Biobuf*, Arfile*, Armember*);
int arcreate(char*);
@@ -149,7 +152,7 @@ void arinsert(Arfile*, Armember*);
void *armalloc(int);
char *arstrdup(char*);
void armove(Biobuf*, Arfile*, Armember*);
-void arread(Biobuf*, Armember*, int);
+void arread(Biobuf*, Armember*);
void arstream(int, Arfile*);
int arwrite(int, Armember*);
int bamatch(char*, char*);
@@ -179,6 +182,7 @@ void trim(char*, char*, int);
void usage(void);
void wrerr(void);
void wrsym(Biobuf*, long, Arsymref*);
+int arread_cutprefix(Biobuf*, Armember*);
void rcmd(char*, int, char**); /* command processing */
void dcmd(char*, int, char**);
@@ -220,6 +224,7 @@ main(int argc, char *argv[])
case 'v': vflag = 1; break;
case 'x': setcom(xcmd); break;
case 'S': Sflag = 1; break;
+ case 'P': Pflag = 1; break;
default:
fprint(2, "gopack: bad option `%c'\n", *cp);
exits("error");
@@ -236,6 +241,15 @@ main(int argc, char *argv[])
if(argc < 3)
usage();
}
+ if(Pflag) {
+ if(argc < 4) {
+ fprint(2, "gopack: P flag requires prefix argument\n");
+ usage();
+ }
+ prefix = argv[2];
+ argv++;
+ argc--;
+ }
if(comfun == 0) {
if(uflag == 0) {
fprint(2, "gopack: one of [%s] must be specified\n", man);
@@ -313,7 +327,16 @@ rcmd(char *arname, int count, char **files)
skip(&bar, bp->size);
continue;
}
- if (count && !match(count, files)) {
+ /*
+ * the plan 9 ar treats count == 0 as equivalent
+ * to listing all the archive's files on the command line:
+ * it will try to open every file name in the archive
+ * and copy that file into the archive if it exists.
+ * for go we disable that behavior, because we use
+ * r with no files to make changes to the archive itself,
+ * using the S or P flags.
+ */
+ if (!match(count, files)) {
scanobj(&bar, ap, bp->size);
arcopy(&bar, ap, bp);
continue;
@@ -430,7 +453,7 @@ 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;
@@ -972,7 +995,7 @@ phaseerr(int offset)
void
usage(void)
{
- fprint(2, "usage: gopack [%s][%s] archive files ...\n", opt, man);
+ fprint(2, "usage: gopack [%s][%s][P prefix] archive files ...\n", opt, man);
exits("error");
}
@@ -1012,29 +1035,32 @@ armove(Biobuf *b, Arfile *ap, Armember *bp)
{
char *cp;
Dir *d;
+ vlong n;
d = dirfstat(Bfildes(b));
if (d == nil) {
fprint(2, "gopack: cannot stat %s\n", file);
return;
}
+
trim(file, bp->hdr.name, sizeof(bp->hdr.name));
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);
sprint(bp->hdr.size, "%-10lld", d->length);
strncpy(bp->hdr.fmag, ARFMAG, 2);
bp->size = d->length;
- arread(b, bp, bp->size);
- if (d->length&0x01)
- d->length++;
+ arread(b, bp);
+ n = bp->size;
+ if (n&1)
+ n++;
if (ap) {
arinsert(ap, bp);
- ap->size += d->length+SAR_HDR;
+ ap->size += n+SAR_HDR;
}
free(d);
}
@@ -1047,10 +1073,10 @@ arcopy(Biobuf *b, Arfile *ap, Armember *bp)
{
long n;
+ arread(b, bp);
n = bp->size;
if (n & 01)
n++;
- arread(b, bp, n);
if (ap) {
arinsert(ap, bp);
ap->size += n+SAR_HDR;
@@ -1125,7 +1151,7 @@ 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 +1188,7 @@ 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);
@@ -1316,7 +1342,8 @@ longt(Armember *bp)
Bprint(&bout, "%7ld", bp->size);
date = bp->date;
cp = ctime(&date);
- Bprint(&bout, " %-12.12s %-4.4s ", cp+4, cp+24);
+ /* using unix ctime, not plan 9 time, so cp+20 for year, not cp+24 */
+ Bprint(&bout, " %-12.12s %-4.4s ", cp+4, cp+20);
}
int m1[] = { 1, ROWN, 'r', '-' };
@@ -1378,17 +1405,29 @@ newmember(void) /* allocate a member buffer */
}
void
-arread(Biobuf *b, Armember *bp, int n) /* read an image into a member buffer */
+arread(Biobuf *b, Armember *bp) /* read an image into a member buffer */
{
int i;
+ vlong off;
- bp->member = armalloc(n);
- i = Bread(b, bp->member, n);
+ bp->member = armalloc(bp->size);
+
+ // If P flag is set, let arread_cutprefix try.
+ // If it succeeds, we're done. If not, fall back
+ // to a direct copy.
+ off = Boffset(b);
+ if(Pflag && arread_cutprefix(b, bp))
+ return;
+ Bseek(b, off, 0);
+
+ i = Bread(b, bp->member, bp->size);
if (i < 0) {
free(bp->member);
bp->member = 0;
rderr();
}
+ if(bp->size&1)
+ Bgetc(b);
}
/*
@@ -1551,3 +1590,109 @@ arstrdup(char *s)
}
+/*
+ * Parts of libmach we're not supposed
+ * to look at but need for arread_cutprefix.
+ */
+extern int _read5(Biobuf*, Prog*);
+extern int _read6(Biobuf*, Prog*);
+extern int _read8(Biobuf*, Prog*);
+int (*reader[256])(Biobuf*, Prog*) = {
+ [ObjArm] = _read5,
+ [ObjAmd64] = _read6,
+ [Obj386] = _read8,
+};
+
+/*
+ * copy b into bp->member but rewrite object
+ * during copy to drop prefix from all file names.
+ * return 1 if b was recognized as an object file
+ * and copied successfully, 0 otherwise.
+ */
+int
+arread_cutprefix(Biobuf *b, Armember *bp)
+{
+ vlong offset, o, end;
+ int n, t;
+ int (*rd)(Biobuf*, Prog*);
+ char *w, *inprefix;
+ Prog p;
+
+ offset = Boffset(b);
+ end = offset + bp->size;
+ t = objtype(b, nil);
+ if(t < 0)
+ return 0;
+ if((rd = reader[t]) == nil)
+ return 0;
+
+ // copy header
+ w = bp->member;
+ n = Boffset(b) - offset;
+ Bseek(b, -n, 1);
+ if(Bread(b, w, n) != n)
+ return 0;
+ offset += n;
+ w += n;
+
+ // read object file one pseudo-instruction at a time,
+ // eliding the file name instructions that refer to
+ // the prefix.
+ memset(&p, 0, sizeof p);
+ inprefix = nil;
+ while(Boffset(b) < end && rd(b, &p)) {
+ if(p.kind == aName && p.type == UNKNOWN && p.sym == 1 && p.id[0] == '<') {
+ // part of a file path.
+ // we'll keep continuing (skipping the copy)
+ // around the loop until either we get to a
+ // name piece that should be kept or we see
+ // the whole prefix.
+
+ if(inprefix == nil && prefix[0] == '/' && p.id[1] == '/' && p.id[2] == '\0') {
+ // leading /
+ inprefix = prefix+1;
+ } else if(inprefix != nil) {
+ // handle subsequent elements
+ n = strlen(p.id+1);
+ if(strncmp(p.id+1, inprefix, n) == 0 && (inprefix[n] == '/' || inprefix[n] == '\0')) {
+ inprefix += n;
+ if(inprefix[0] == '/')
+ inprefix++;
+ }
+ }
+
+ if(inprefix && inprefix[0] == '\0') {
+ // reached end of prefix.
+ // if we another path element follows,
+ // nudge the offset to skip over the prefix we saw.
+ // if not, leave offset alone, to emit the whole name.
+ // additional name elements will not be skipped
+ // because inprefix is now nil and we won't see another
+ // leading / in this name.
+ inprefix = nil;
+ o = Boffset(b);
+ if(o < end && rd(b, &p) && p.kind == aName && p.type == UNKNOWN && p.sym == 1 && p.id[0] == '<') {
+ // print("skip %lld-%lld\n", offset, o);
+ offset = o;
+ }
+ }
+ }
+
+ // copy instructions
+ if(!inprefix) {
+ n = Boffset(b) - offset;
+ Bseek(b, -n, 1);
+ if(Bread(b, w, n) != n)
+ return 0;
+ offset += n;
+ w += n;
+ }
+ }
+ bp->size = w - (char*)bp->member;
+ sprint(bp->hdr.size, "%-10lld", (vlong)bp->size);
+ strncpy(bp->hdr.fmag, ARFMAG, 2);
+ Bseek(b, end, 0);
+ if(Boffset(b)&1)
+ Bgetc(b);
+ return 1;
+}
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