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git/merge: preserve exec bit correctly

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A while ago, qwx noticed that we clobbered the exec
bit when merging files. This is not what we want, so
we changed the operator precedence to avoid merging
dirty files implicitly.

But we do want to merge, because it's convenient for
maintaining permissions. So, instead, we should do a
3 way merge of the exec bit.

This patch does that, as well as reverting the rollback
of that change.

While we're here, we adjust the timestamps correctly
in git/branch.

This requires changes to git/fs, because without an open
handler, lib9p allows opening any file with any mode,
which confuses 'test -x'.
This commit is contained in:
Ori Bernstein 2022-04-16 23:53:19 +00:00 committed by xfnw
parent 6949c4a707
commit dba98f649c
2 changed files with 48 additions and 16 deletions
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16
sys/src/cmd/git/branch
View file

@ -48,9 +48,12 @@ if(~ $#newbr 0){
modified=`$nl{git/query -c HEAD $base | grep '^[^-]' | subst '^..'} modified=`$nl{git/query -c HEAD $base | grep '^[^-]' | subst '^..'}
deleted=`$nl{git/query -c HEAD $base | grep '^-' | subst '^..'} deleted=`$nl{git/query -c HEAD $base | grep '^-' | subst '^..'}
if(! ~ $#modified 0 || {! ~ $#deleted 0 && ~ $#merge 0}){ # if we're not merging, don't clobber existing changes.
git/walk -fRMA $modified $deleted || if(~ $#merge 0){
die 'uncommitted changes would be clobbered' if(! ~ $#modified 0 || ! ~ $#deleted 0){
git/walk -fRMA $modified $deleted ||
die 'uncommitted changes would be clobbered'
}
} }
if(~ $delete 1){ if(~ $delete 1){
rm -f .git/$new rm -f .git/$new
@ -97,10 +100,9 @@ for(m in $cleanpaths){
rm -rf .git/index9/tracked/$m rm -rf .git/index9/tracked/$m
} }
if(~ $b file){ if(~ $b file){
if(cp -x -- $basedir/tree/$m $m) cp -x -- $basedir/tree/$m $m
walk -eq $m > .git/index9/tracked/$m walk -eq $m > .git/index9/tracked/$m
if not touch $m
echo -n > .git/index9/tracked/$m
} }
} }

48
sys/src/cmd/git/fs.c
View file

@ -70,13 +70,14 @@ char *qroot[] = {
"ctl", "ctl",
}; };
#define Eperm "permission denied"; #define Eperm "permission denied"
#define Eexist "does not exist"; #define Eexist "does not exist"
#define E2long "path too long"; #define E2long "path too long"
#define Enodir "not a directory"; #define Enodir "not a directory"
#define Erepo "unable to read repo"; #define Erepo "unable to read repo"
#define Egreg "wat"; #define Eobject "invalid object"
#define Ebadobj "invalid object"; #define Egreg "wat"
#define Ebadobj "invalid object"
char gitdir[512]; char gitdir[512];
char *username; char *username;
@ -624,9 +625,9 @@ gitwalk1(Fid *fid, char *name, Qid *q)
e = objwalk1(q, o->obj, o, c, name, Qobject, aux); e = objwalk1(q, o->obj, o, c, name, Qobject, aux);
}else{ }else{
if(hparse(&h, name) == -1) if(hparse(&h, name) == -1)
return "invalid object name"; return Eobject;
if((c->obj = readobject(h)) == nil) if((c->obj = readobject(h)) == nil)
return "could not read object"; return Eobject;
if(c->obj->type == GBlob || c->obj->type == GTag){ if(c->obj->type == GBlob || c->obj->type == GTag){
c->mode = 0644; c->mode = 0644;
q->type = 0; q->type = 0;
@ -804,6 +805,34 @@ gitread(Req *r)
respond(r, e); respond(r, e);
} }
static void
gitopen(Req *r)
{
Gitaux *aux;
Crumb *c;
aux = r->fid->aux;
c = crumb(aux, 0);
switch(r->ifcall.mode&3){
default:
respond(r, "botched mode");
break;
case OWRITE:
respond(r, Eperm);
break;
case OREAD:
case ORDWR:
respond(r, nil);
break;
case OEXEC:
if((c->mode & 0111) == 0)
respond(r, Eperm);
else
respond(r, nil);
break;
}
}
static void static void
gitstat(Req *r) gitstat(Req *r)
{ {
@ -830,6 +859,7 @@ Srv gitsrv = {
.attach=gitattach, .attach=gitattach,
.walk1=gitwalk1, .walk1=gitwalk1,
.clone=gitclone, .clone=gitclone,
.open=gitopen,
.read=gitread, .read=gitread,
.stat=gitstat, .stat=gitstat,
.destroyfid=gitdestroyfid, .destroyfid=gitdestroyfid,