discovery-helper: use reflink copy if available
A reflink copy will copy the files "as usual" but keep using the same data block
underneath. This is only supported by "copy on write" file system like btrfs or
zfs.
This will achieve similar performance that the existing hardlink clone that
Mercurial performs with the same initial space saving. However, it will behave
better on revlogs start being touch by strip. Instead of duplicating all data in
the touched revlogs, only the block actually affected by the strip will be
duplicated. This save a lot of space when building many variants of large
repositories.
The --reflink=always flag make sure the `cp` call fails if reflink copies are
not supported. Falling back to local clone.
Issue835: qpush fails immediately when patching a missing file, but
remaining added files are still created empty which will trick a
future qrefresh.
$ cat > writelines.py <<EOF
> import sys
> if sys.version_info[0] >= 3:
> encode = lambda x: x.encode('utf-8').decode('unicode_escape').encode('utf-8')
> else:
> encode = lambda x: x.decode('string_escape')
> path = sys.argv[1]
> args = sys.argv[2:]
> assert (len(args) % 2) == 0
>
> f = open(path, 'wb')
> for i in range(len(args) // 2):
> count, s = args[2 * i:2 * i + 2]
> count = int(count)
> s = encode(s)
> f.write(s * count)
> f.close()
> EOF
$ echo "[extensions]" >> $HGRCPATH
$ echo "mq=" >> $HGRCPATH
$ hg init normal
$ cd normal
$ "$PYTHON" ../writelines.py b 10 'a\n'
$ hg ci -Am addb
adding b
$ echo a > a
$ "$PYTHON" ../writelines.py b 2 'b\n' 10 'a\n' 2 'c\n'
$ echo c > c
$ hg add a c
$ hg qnew -f changeb
$ hg qpop
popping changeb
patch queue now empty
$ hg rm b
$ hg ci -Am rmb
Push patch with missing target:
$ hg qpush
applying changeb
unable to find 'b' for patching
(use '--prefix' to apply patch relative to the current directory)
2 out of 2 hunks FAILED -- saving rejects to file b.rej
patch failed, unable to continue (try -v)
patch failed, rejects left in working directory
errors during apply, please fix and qrefresh changeb
[2]
Display added files:
$ cat a
a
$ cat c
c
Display rejections:
$ cat b.rej
--- b
+++ b
@@ -1,3 +1,5 @@
+b
+b
a
a
a
@@ -8,3 +10,5 @@
a
a
a
+c
+c
Test missing renamed file
$ hg qpop
popping changeb
patch queue now empty
$ hg up -qC 0
$ echo a > a
$ hg mv b bb
$ "$PYTHON" ../writelines.py bb 2 'b\n' 10 'a\n' 2 'c\n'
$ echo c > c
$ hg add a c
$ hg qnew changebb
$ hg qpop
popping changebb
patch queue now empty
$ hg up -qC 1
$ hg qpush
applying changebb
patching file bb
Hunk #1 FAILED at 0
Hunk #2 FAILED at 7
2 out of 2 hunks FAILED -- saving rejects to file bb.rej
b not tracked!
patch failed, unable to continue (try -v)
patch failed, rejects left in working directory
errors during apply, please fix and qrefresh changebb
[2]
$ cat a
a
$ cat c
c
$ cat bb.rej
--- bb
+++ bb
@@ -1,3 +1,5 @@
+b
+b
a
a
a
@@ -8,3 +10,5 @@
a
a
a
+c
+c
$ cd ..
$ echo "[diff]" >> $HGRCPATH
$ echo "git=1" >> $HGRCPATH
$ hg init git
$ cd git
$ "$PYTHON" ../writelines.py b 1 '\x00'
$ hg ci -Am addb
adding b
$ echo a > a
$ "$PYTHON" ../writelines.py b 1 '\x01' 1 '\x00'
$ echo c > c
$ hg add a c
$ hg qnew -f changeb
$ hg qpop
popping changeb
patch queue now empty
$ hg rm b
$ hg ci -Am rmb
Push git patch with missing target:
$ hg qpush
applying changeb
unable to find 'b' for patching
(use '--prefix' to apply patch relative to the current directory)
1 out of 1 hunks FAILED -- saving rejects to file b.rej
patch failed, unable to continue (try -v)
patch failed, rejects left in working directory
errors during apply, please fix and qrefresh changeb
[2]
$ hg st
? b.rej
Display added files:
$ cat a
a
$ cat c
c
Display rejections:
$ cat b.rej
--- b
+++ b
GIT binary patch
literal 2
Jc${No0000400IC2
$ cd ..
Test push creating directory during git copy or rename:
$ hg init missingdir
$ cd missingdir
$ echo a > a
$ hg ci -Am adda
adding a
$ mkdir d
$ hg copy a d/a2
$ hg mv a d/a
$ hg qnew -g -f patch
$ hg qpop
popping patch
patch queue now empty
$ hg qpush
applying patch
now at: patch
$ cd ..