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* [PATCH 0/1] p4: fix "Not a valid object name HEAD0" when unshelving
@ 2019-05-10 15:33 Mike Mueller via GitGitGadget
  2019-05-10 15:33 ` [PATCH 1/1] p4 unshelve: fix "Not a valid object name HEAD0" Mike Mueller via GitGitGadget
  0 siblings, 1 reply; 3+ messages in thread
From: Mike Mueller via GitGitGadget @ 2019-05-10 15:33 UTC (permalink / raw)
  To: git; +Cc: Junio C Hamano

git p4 unshelve was failing with "fatal: Not a valid object name HEAD0" and
"Command failed: git cat-file commit HEAD^0" on certain systems e.g. git
version 2.21.0.windows.1 + python 2.7.16

It seems that certain python pOpen implementations drop the ^ character when
invoked using a string instead of an array as first argument, which is what
is done by extractLogMessageFromGitCommit.

Solution is to use the array format of passing the command to fOpen, which
is preferred (see https://docs.python.org/2/library/subprocess.html) and is
used in other parts of this code anyway.

Mike Mueller (1):
  p4 unshelve: fix "Not a valid object name HEAD0"

 git-p4.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


base-commit: aeb582a98374c094361cba1bd756dc6307432c42
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-183%2Fmdymike%2Fmaint-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-183/mdymike/maint-v1
Pull-Request: https://github.com/gitgitgadget/git/pull/183
-- 
gitgitgadget

^ permalink raw reply	[flat|nested] 3+ messages in thread

* [PATCH 1/1] p4 unshelve: fix "Not a valid object name HEAD0"
  2019-05-10 15:33 [PATCH 0/1] p4: fix "Not a valid object name HEAD0" when unshelving Mike Mueller via GitGitGadget
@ 2019-05-10 15:33 ` Mike Mueller via GitGitGadget
  2019-05-15  5:25   ` Junio C Hamano
  0 siblings, 1 reply; 3+ messages in thread
From: Mike Mueller via GitGitGadget @ 2019-05-10 15:33 UTC (permalink / raw)
  To: git; +Cc: Junio C Hamano, Mike Mueller

From: Mike Mueller <mike.mueller@moodys.com>

git p4 unshelve was failing with these errors on Windows:

fatal: Not a valid object name HEAD0
Command failed: git cat-file commit HEAD^0

(git version 2.21.0.windows.1, python 2.7.16)

The pOpen call used by git-p4 to invoke the git command can take either a
string or an array as a first argument.  The array form is preferred
however the extractLogMessageFromGitCommit method was using the string
form, which makes the caller responsible for escaping the command text
appropriately (see https://docs.python.org/2/library/subprocess.html)

Somewhat ironically, the carat character is the escape character in
Windows and so should be escaped (HEAD^^0).  Without the extra carat, the
OS was passing an escaped 0 to the git command instead, and the git
command was rejecting the invalid object name "HEAD0"

The behaviour can be confirmed by typing ECHO HEAD^0 at the command-
prompt, which emits HEAD0.

The solution is simply to use the array format of passing the command to
fOpen, which is preferred and used in other parts of this code anyway.

Signed-off-by: Mike Mueller <mike.mueller@moodys.com>
---
 git-p4.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-p4.py b/git-p4.py
index 5b79920f46..0b5bfcbc5e 100755
--- a/git-p4.py
+++ b/git-p4.py
@@ -737,7 +737,7 @@ def extractLogMessageFromGitCommit(commit):
 
     ## fixme: title is first line of commit, not 1st paragraph.
     foundTitle = False
-    for log in read_pipe_lines("git cat-file commit %s" % commit):
+    for log in read_pipe_lines(["git", "cat-file", "commit", commit]):
        if not foundTitle:
            if len(log) == 1:
                foundTitle = True
-- 
gitgitgadget

^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [PATCH 1/1] p4 unshelve: fix "Not a valid object name HEAD0"
  2019-05-10 15:33 ` [PATCH 1/1] p4 unshelve: fix "Not a valid object name HEAD0" Mike Mueller via GitGitGadget
@ 2019-05-15  5:25   ` Junio C Hamano
  0 siblings, 0 replies; 3+ messages in thread
From: Junio C Hamano @ 2019-05-15  5:25 UTC (permalink / raw)
  To: Mike Mueller via GitGitGadget; +Cc: git, Mike Mueller

"Mike Mueller via GitGitGadget" <gitgitgadget@gmail.com> writes:

> From: Mike Mueller <mike.mueller@moodys.com>
>
> git p4 unshelve was failing with these errors on Windows:
>
> fatal: Not a valid object name HEAD0
> Command failed: git cat-file commit HEAD^0
>
> (git version 2.21.0.windows.1, python 2.7.16)
>
> The pOpen call used by git-p4 to invoke the git command can take either a
> string or an array as a first argument.  The array form is preferred
> however the extractLogMessageFromGitCommit method was using the string
> form, which makes the caller responsible for escaping the command text
> appropriately (see https://docs.python.org/2/library/subprocess.html)

Rewrite the sentence that begin with "The array form is
preferred...", as it is somewhat unreadable.  "X is preferred
because Y; however Z was using the other one" would be
understandable.

> Somewhat ironically, the carat character is the escape character in

s/carat/caret/ everywhere.

> Windows and so should be escaped (HEAD^^0).  Without the extra carat, the
> OS was passing an escaped 0 to the git command instead, and the git
> command was rejecting the invalid object name "HEAD0"
>
> The behaviour can be confirmed by typing ECHO HEAD^0 at the command-
> prompt, which emits HEAD0.
>
> The solution is simply to use the array format of passing the command to
> fOpen, which is preferred and used in other parts of this code anyway.
>
> Signed-off-by: Mike Mueller <mike.mueller@moodys.com>
> ---
>  git-p4.py | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/git-p4.py b/git-p4.py
> index 5b79920f46..0b5bfcbc5e 100755
> --- a/git-p4.py
> +++ b/git-p4.py
> @@ -737,7 +737,7 @@ def extractLogMessageFromGitCommit(commit):
>  
>      ## fixme: title is first line of commit, not 1st paragraph.
>      foundTitle = False
> -    for log in read_pipe_lines("git cat-file commit %s" % commit):
> +    for log in read_pipe_lines(["git", "cat-file", "commit", commit]):
>         if not foundTitle:
>             if len(log) == 1:
>                 foundTitle = True

^ permalink raw reply	[flat|nested] 3+ messages in thread

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Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-10 15:33 [PATCH 0/1] p4: fix "Not a valid object name HEAD0" when unshelving Mike Mueller via GitGitGadget
2019-05-10 15:33 ` [PATCH 1/1] p4 unshelve: fix "Not a valid object name HEAD0" Mike Mueller via GitGitGadget
2019-05-15  5:25   ` Junio C Hamano

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