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git-p4: fully support unshelving changelists

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The previous git-p4 unshelve support would check for changes
in Perforce to the files being unshelved since the original
shelve, and would complain if any were found.

This was to ensure that the user wouldn't end up with both the
shelved change delta, and some deltas from other changes in their
git commit.

e.g. given fileA:
      the
      quick
      brown
      fox

  change1: s/the/The/   <- p4 shelve this change
  change2: s/fox/Fox/   <- p4 submit this change
  git p4 unshelve 1     <- FAIL

This change teaches the P4Unshelve class to always create a parent
commit which matches the P4 tree (for the files being unshelved) at
the point prior to the P4 shelve being created (which is reported
in the p4 description for a shelved changelist).

That then means git-p4 can always create a git commit matching the
P4 shelve that was originally created, without any extra deltas.

The user might still need to use the --origin option though - there
is no way for git-p4 to work out the versions of all of the other
*unchanged* files in the shelve, since this information is not recorded
by Perforce.

Additionally this fixes handling of shelved 'move' operations.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Luke Diamand 2018-10-15 12:14:08 +01:00 committed by Junio C Hamano
parent 088131273b
commit 89143ac28a
3 changed files with 106 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/git-p4.txt
View File

@ -177,8 +177,8 @@ Unshelving will take a shelved P4 changelist, and produce the equivalent git com
in the branch refs/remotes/p4-unshelved/<changelist>.
The git commit is created relative to the current origin revision (HEAD by default).
If the shelved changelist's parent revisions differ, git-p4 will refuse to unshelve;
you need to be unshelving onto an equivalent tree.
A parent commit is created based on the origin, and then the unshelve commit is
created based on that.
The origin revision can be changed with the "--origin" option.

84
git-p4.py
View File

@ -1306,6 +1306,9 @@ class GitLFS(LargeFileSystem):
return LargeFileSystem.processContent(self, git_mode, relPath, contents)
class Command:
delete_actions = ( "delete", "move/delete", "purge" )
add_actions = ( "add", "move/add" )
def __init__(self):
self.usage = "usage: %prog [options]"
self.needsGit = True
@ -2524,7 +2527,6 @@ class View(object):
return ""
class P4Sync(Command, P4UserMap):
delete_actions = ( "delete", "move/delete", "purge" )
def __init__(self):
Command.__init__(self)
@ -2612,20 +2614,7 @@ class P4Sync(Command, P4UserMap):
if self.verbose:
print("checkpoint finished: " + out)
def cmp_shelved(self, path, filerev, revision):
""" Determine if a path at revision #filerev is the same as the file
at revision @revision for a shelved changelist. If they don't match,
unshelving won't be safe (we will get other changes mixed in).
This is comparing the revision that the shelved changelist is *based* on, not
the shelved changelist itself.
"""
ret = p4Cmd(["diff2", "{0}#{1}".format(path, filerev), "{0}@{1}".format(path, revision)])
if verbose:
print("p4 diff2 path %s filerev %s revision %s => %s" % (path, filerev, revision, ret))
return ret["status"] == "identical"
def extractFilesFromCommit(self, commit, shelved=False, shelved_cl = 0, origin_revision = 0):
def extractFilesFromCommit(self, commit, shelved=False, shelved_cl = 0):
self.cloneExclude = [re.sub(r"\.\.\.$", "", path)
for path in self.cloneExclude]
files = []
@ -2650,17 +2639,6 @@ class P4Sync(Command, P4UserMap):
file["type"] = commit["type%s" % fnum]
if shelved:
file["shelved_cl"] = int(shelved_cl)
# For shelved changelists, check that the revision of each file that the
# shelve was based on matches the revision that we are using for the
# starting point for git-fast-import (self.initialParent). Otherwise
# the resulting diff will contain deltas from multiple commits.
if file["action"] != "add" and \
not self.cmp_shelved(path, file["rev"], origin_revision):
sys.exit("change {0} not based on {1} for {2}, cannot unshelve".format(
commit["change"], self.initialParent, path))
files.append(file)
fnum = fnum + 1
return files
@ -3032,7 +3010,7 @@ class P4Sync(Command, P4UserMap):
print('Ignoring file outside of prefix: {0}'.format(path))
return hasPrefix
def commit(self, details, files, branch, parent = ""):
def commit(self, details, files, branch, parent = "", allow_empty=False):
epoch = details["time"]
author = details["user"]
jobs = self.extractJobsFromCommit(details)
@ -3046,7 +3024,10 @@ class P4Sync(Command, P4UserMap):
files = [f for f in files
if self.inClientSpec(f['path']) and self.hasBranchPrefix(f['path'])]
if not files and not gitConfigBool('git-p4.keepEmptyCommits'):
if gitConfigBool('git-p4.keepEmptyCommits'):
allow_empty = True
if not files and not allow_empty:
print('Ignoring revision {0} as it would produce an empty commit.'
.format(details['change']))
return
@ -3387,10 +3368,10 @@ class P4Sync(Command, P4UserMap):
else:
return None
def importChanges(self, changes, shelved=False, origin_revision=0):
def importChanges(self, changes, origin_revision=0):
cnt = 1
for change in changes:
description = p4_describe(change, shelved)
description = p4_describe(change)
self.updateOptionDict(description)
if not self.silent:
@ -3460,7 +3441,7 @@ class P4Sync(Command, P4UserMap):
print("Parent of %s not found. Committing into head of %s" % (branch, parent))
self.commit(description, filesForCommit, branch, parent)
else:
files = self.extractFilesFromCommit(description, shelved, change, origin_revision)
files = self.extractFilesFromCommit(description)
self.commit(description, files, self.branch,
self.initialParent)
# only needed once, to connect to the previous commit
@ -3957,7 +3938,6 @@ class P4Unshelve(Command):
self.verbose = False
self.noCommit = False
self.destbranch = "refs/remotes/p4-unshelved"
self.origin = "p4/master"
def renameBranch(self, branch_name):
""" Rename the existing branch to branch_name.N
@ -3989,6 +3969,32 @@ class P4Unshelve(Command):
sys.exit("could not find git-p4 commits in {0}".format(self.origin))
def createShelveParent(self, change, branch_name, sync, origin):
""" Create a commit matching the parent of the shelved changelist 'change'
"""
parent_description = p4_describe(change, shelved=True)
parent_description['desc'] = 'parent for shelved changelist {}\n'.format(change)
files = sync.extractFilesFromCommit(parent_description, shelved=False, shelved_cl=change)
parent_files = []
for f in files:
# if it was added in the shelved changelist, it won't exist in the parent
if f['action'] in self.add_actions:
continue
# if it was deleted in the shelved changelist it must not be deleted
# in the parent - we might even need to create it if the origin branch
# does not have it
if f['action'] in self.delete_actions:
f['action'] = 'add'
parent_files.append(f)
sync.commit(parent_description, parent_files, branch_name,
parent=origin, allow_empty=True)
print("created parent commit for {0} based on {1} in {2}".format(
change, self.origin, branch_name))
def run(self, args):
if len(args) != 1:
return False
@ -3998,9 +4004,8 @@ class P4Unshelve(Command):
sync = P4Sync()
changes = args
sync.initialParent = self.origin
# use the first change in the list to construct the branch to unshelve into
# only one change at a time
change = changes[0]
# if the target branch already exists, rename it
@ -4013,14 +4018,21 @@ class P4Unshelve(Command):
sync.suppress_meta_comment = True
settings = self.findLastP4Revision(self.origin)
origin_revision = settings['change']
sync.depotPaths = settings['depot-paths']
sync.branchPrefixes = sync.depotPaths
sync.openStreams()
sync.loadUserMapFromCache()
sync.silent = True
sync.importChanges(changes, shelved=True, origin_revision=origin_revision)
# create a commit for the parent of the shelved changelist
self.createShelveParent(change, branch_name, sync, self.origin)
# create the commit for the shelved changelist itself
description = p4_describe(change, True)
files = sync.extractFilesFromCommit(description, True, change)
sync.commit(description, files, branch_name, "")
sync.closeStreams()
print("unshelved changelist {0} into {1}".format(change, branch_name))

69
t/t9832-unshelve.sh
View File

@ -19,8 +19,10 @@ test_expect_success 'init depot' '
p4 add file1 &&
p4 submit -d "change 1" &&
: >file_to_delete &&
: >file_to_move &&
p4 add file_to_delete &&
p4 submit -d "file to delete"
p4 add file_to_move &&
p4 submit -d "add files to delete"
)
'
@ -36,6 +38,8 @@ test_expect_success 'create shelved changelist' '
echo "new file" >file2 &&
p4 add file2 &&
p4 delete file_to_delete &&
p4 edit file_to_move &&
p4 move file_to_move moved_file &&
p4 opened &&
p4 shelve -i <<EOF
Change: new
@ -47,6 +51,8 @@ Files:
//depot/file1
//depot/file2
//depot/file_to_delete
//depot/file_to_move
//depot/moved_file
EOF
) &&
@ -59,7 +65,9 @@ EOF
test_path_is_file file2 &&
test_cmp file1 "$cli"/file1 &&
test_cmp file2 "$cli"/file2 &&
test_path_is_missing file_to_delete
test_path_is_missing file_to_delete &&
test_path_is_missing file_to_move &&
test_path_is_file moved_file
)
'
@ -92,6 +100,18 @@ EOF
)
'
shelve_one_file () {
description="Change to be unshelved" &&
file="$1" &&
p4 shelve -i <<EOF
Change: new
Description:
$description
Files:
$file
EOF
}
# This is the tricky case where the shelved changelist base revision doesn't
# match git-p4's idea of the base revision
#
@ -108,29 +128,52 @@ test_expect_success 'create shelved changelist based on p4 change ahead of p4/ma
p4 submit -d "change:foo" &&
p4 edit file1 &&
echo "bar" >>file1 &&
p4 shelve -i <<EOF &&
Change: new
Description:
Change to be unshelved
Files:
//depot/file1
EOF
shelve_one_file //depot/file1 &&
change=$(last_shelved_change) &&
p4 describe -S $change | grep -q "Change to be unshelved"
p4 describe -S $change >out.txt &&
grep -q "Change to be unshelved" out.txt
)
'
# Now try to unshelve it. git-p4 should refuse to do so.
# Now try to unshelve it.
test_expect_success 'try to unshelve the change' '
test_when_finished cleanup_git &&
(
change=$(last_shelved_change) &&
cd "$git" &&
test_must_fail git p4 unshelve $change 2>out.txt &&
grep -q "cannot unshelve" out.txt
git p4 unshelve $change >out.txt &&
grep -q "unshelved changelist $change" out.txt
)
'
# Specify the origin. Create 2 unrelated files, and check that
# we only get the one in HEAD~, not the one in HEAD.
test_expect_success 'unshelve specifying the origin' '
(
cd "$cli" &&
: >unrelated_file0 &&
p4 add unrelated_file0 &&
p4 submit -d "unrelated" &&
: >unrelated_file1 &&
p4 add unrelated_file1 &&
p4 submit -d "unrelated" &&
: >file_to_shelve &&
p4 add file_to_shelve &&
shelve_one_file //depot/file_to_shelve
) &&
test_when_finished cleanup_git &&
git p4 clone --dest="$git" //depot/@all &&
(
cd "$git" &&
change=$(last_shelved_change) &&
git p4 unshelve --origin HEAD~ $change &&
git checkout refs/remotes/p4-unshelved/$change &&
test_path_is_file unrelated_file0 &&
test_path_is_missing unrelated_file1 &&
test_path_is_file file_to_shelve
)
'
test_expect_success 'kill p4d' '
kill_p4d
'