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derp: handle file type changes

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handle cases when files become directories or directories
become files.
This commit is contained in:
cinap_lenrek 2012-11-21 15:34:12 +01:00
parent f188f2f073
commit 73744b9f48
2 changed files with 100 additions and 46 deletions
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6
sys/man/1/derp
View file

@ -22,8 +22,10 @@ using a third common backup directory
.I oldfile
as reference. The changes found are printed
to standard output, one per line, with the file
status describing either side followed by tabulator
and the relative file path.
status describing either sides actions followed
by tabulator and the relative file path which might
be empty in case when the changed files refers to the
ones given at program arguments.
.LP
The possible status codes:
.TP

140
sys/src/cmd/derp.c
View file

@ -31,6 +31,18 @@ error(char *fmt, ...)
#pragma varargck argpos error 1
void*
emalloc(int n)
{
void *v;
if((v = malloc(n)) == nil){
noerror = 0;
error("out of memory");
}
return v;
}
enum {
BUFSIZE = 8*1024,
};
@ -146,16 +158,33 @@ statdir(char *path)
d = dirstat(path);
if(d == nil)
error("can't stat %s: %r", path);
else
d->name = strdup(path);
else {
d->name = emalloc(strlen(path)+1);
strcpy(d->name, path);
}
return d;
}
char*
pjoin(char *path, char *name)
{
char *s;
int n;
n = strlen(path);
s = emalloc(n+strlen(name)+2);
strcpy(s, path);
if(path[0] != '\0' && path[n-1] != '/')
s[n++] = '/';
strcpy(s+n, name);
return s;
}
Dir*
absdir(Dir *d, char *path)
{
if(d != nil)
d->name = smprint("%s/%s", path, d->name);
d->name = pjoin(path, d->name);
return d;
}
@ -252,7 +281,7 @@ diffdir(Dir *ld, Dir *rd, Dir *ad, char *path)
od = nil;
if(t < 0){
sp = smprint("%s/%s", path, ld[i].name);
sp = pjoin(path, ld[i].name);
if(ap == lp)
od = &ld[i];
else while(k < o){
@ -270,7 +299,7 @@ diffdir(Dir *ld, Dir *rd, Dir *ad, char *path)
od = nil;
i++;
} else {
sp = smprint("%s/%s", path, rd[j].name);
sp = pjoin(path, rd[j].name);
if(ap == rp)
od = &rd[j];
else while(k < o){
@ -310,22 +339,23 @@ diffdir(Dir *ld, Dir *rd, Dir *ad, char *path)
void
diffgen(Dir *ld, Dir *rd, Dir *ad, char *path)
{
char *p;
if(dcmp(ld, rd) == 0)
return;
p = nil;
if(ld == nil || rd == nil){
/* one side doesnt exit anymore */
if(ad != nil){
/* existed before, is deletion */
if(ld != nil && (ad->qid.type & QTDIR) && (ld->qid.type & QTDIR)){
/* remote deleted direcotry, remote newer */
p = smprint("nd\t%s\n", path);
diffdir(ld, nil, ad, path);
print("nd\t%s\n", path);
return;
} else if(rd != nil && (ad->qid.type & QTDIR) && (rd->qid.type & QTDIR)){
/* local deleted direcotry, local newer */
p = smprint("dn\t%s\n", path);
diffdir(nil, rd, ad, path);
print("dn\t%s\n", path);
return;
} else if(dcmp(rd, ad) == 0){
/* local deleted file, local newer */
print("dn\t%s\n", path);
@ -333,11 +363,23 @@ diffgen(Dir *ld, Dir *rd, Dir *ad, char *path)
/* remote deleted file, remote newer */
print("nd\t%s\n", path);
} else if(ld != nil){
if((ld->qid.type ^ ad->qid.type) & QTDIR){
/* local file type change, remote deleted, no conflict */
diffgen(ld, nil, nil, path);
return;
}
/* local modified, remote deleted, conflict */
print("md!\t%s\n", path);
return;
} else {
if((rd->qid.type ^ ad->qid.type) & QTDIR){
/* remote file type change, local deleted, no conflict */
diffgen(nil, rd, nil, path);
return;
}
/* remote modified, local deleted, conflict */
print("dm!\t%s\n", path);
return;
}
} else {
/* didnt exist before, is addition */
@ -355,70 +397,80 @@ diffgen(Dir *ld, Dir *rd, Dir *ad, char *path)
if((ad->qid.type & QTDIR) && (ld->qid.type & QTDIR) && (rd->qid.type & QTDIR)){
/* all still directories, no problem */
} else if(dcmp(rd, ad) == 0){
if((ld->qid.type ^ ad->qid.type) & QTDIR){
/* local file type change */
diffgen(nil, ad, ad, path);
diffgen(ld, nil, nil, path);
return;
}
/* local modified file, local newer */
print("mn\t%s\n", path);
} else if(dcmp(ld, ad) == 0){
if((rd->qid.type ^ ad->qid.type) & QTDIR){
/* remote file type change */
diffgen(ad, nil, ad, path);
diffgen(nil, rd, nil, path);
return;
}
/* remote modified file, remote newer */
print("nm\t%s\n", path);
} else {
/* local and remote modified, conflict */
print("mm!\t%s\n", path);
if((ld->qid.type & QTDIR) != (ad->qid.type & QTDIR) &&
(rd->qid.type & QTDIR) != (ad->qid.type & QTDIR) &&
(ld->qid.type & QTDIR) == (rd->qid.type & QTDIR)){
if((ad->qid.type & QTDIR) == 0){
/* local and remote became directories, was file before */
diffdir(ld, rd, nil, path);
} else {
/* local and remote became diverging files, conflict */
print("aa!\t%s\n", path);
}
} else {
/* local and remote modified, conflict */
print("mm!\t%s\n", path);
}
return;
}
} else {
/* didnt exist before, is addition from both */
if((ld->qid.type & QTDIR) && (rd->qid.type & QTDIR)){
/* local and remote added directories, no problem */
} else {
/* local and remote added files, conflict */
/* local and remote added diverging files, conflict */
print("aa!\t%s\n", path);
return;
}
}
}
diffdir(ld, rd, ad, path);
if(p != nil){
print("%s", p);
free(p);
}
}
void
diff3(char *lp, char *ap, char *rp)
{
Dir *ld, *rd, *ad;
char *name;
rd = ad = nil;
if((ld = statdir(lp)) == nil)
ad = nil;
ld = statdir(lp);
rd = statdir(rp);
if(ld == nil && rd == nil)
goto Out;
if((rd = statdir(rp)) == nil)
goto Out;
if(strcmp(ap, lp) == 0)
else if(strcmp(ap, lp) == 0)
ad = ld;
else if(strcmp(ap, rp) == 0)
ad = rd;
else if((ad = statdir(ap)) == nil)
goto Out;
else if(samefile(ad, ld)){
freedir(ad);
ad = ld;
else if((ad = statdir(ap)) != nil){
if(ld != nil && samefile(ad, ld)){
freedir(ad);
ad = ld;
}
else if(rd != nil && samefile(ad, rd)){
freedir(ad);
ad = rd;
}
}
else if(samefile(ad, rd)){
freedir(ad);
ad = rd;
}
if(ld->qid.type & QTDIR)
name = ".";
else {
if(name = strrchr(lp, '/'))
name++;
else
name = lp;
}
diffgen(ld, rd, ad, name);
diffgen(ld, rd, ad, "");
Out:
freedir(ld);
freedir(rd);