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cmd/pack: Running the same pack command twice creates an invalid archive. #8369

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gopherbot opened this issue Jul 14, 2014 · 4 comments
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cmd/pack: Running the same pack command twice creates an invalid archive. #8369

gopherbot opened this issue Jul 14, 2014 · 4 comments
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Go1.4

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@gopherbot
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by dylan.p.hillier:

go version go1.3 linux/amd64

If you use pack to create an archive, the first time you run the command it works. A
second call to the command will kill the file, making it zero bytes.

Pack should probably just create a new valid file over writing any existing one.

Eg.

[gopher@caddyshack sync]$ /home/gopher/downloads/go/pkg/tool/linux_amd64/pack c
/tmp/go-test/sync/atomic.a /tmp/go-test/sync/atomic/_obj/asm_amd64.6
[gopher@caddyshack sync]$ ll /tmp/go-test/sync/atomic.a
-rw-r--r-- 1 gopher gopher_grp 4.1K Jul 15 07:34 /tmp/go-test/sync/atomic.a
[gopher@caddyshack sync]$ /home/gopher/downloads/go/pkg/tool/linux_amd64/pack c
/tmp/go-test/sync/atomic.a /tmp/go-test/sync/atomic/_obj/asm_amd64.6
pack: file is not an archive: bad header
[gopher@caddyshack sync]$ ll /tmp/go-test/sync/atomic.a
-rw-r--r-- 1 gopher gopher_grp 0 Jul 15 07:35 /tmp/go-test/sync/atomic.a
@ianlancetaylor
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Comment 1:

Looks like "pack c FILE" when FILE already exists truncates FILE and then expects it to
have an archive header.

Labels changed: added repo-main, release-go1.4.

@rsc
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rsc commented Sep 15, 2014

Comment 2:

Status changed to Accepted.

@gopherbot
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Comment 3:

CL https://golang.org/cl/147010046 mentions this issue.

@robpike
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robpike commented Sep 24, 2014

Comment 4:

This issue was closed by revision 1193993.

Status changed to Fixed.

@rsc rsc added this to the Go1.4 milestone Apr 14, 2015
@rsc rsc removed the release-go1.4 label Apr 14, 2015
@golang golang locked and limited conversation to collaborators Jun 25, 2016
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jun 25, 2018
@robpike @wheatman
cmd/pack: fix c command for existing file
0b27b3c 
There were at least two bugs:
1) It would overwrite a non-archive.
2) It would truncate a non-archive and then fail.
In general the file handling was too clever to be correct.
Make it more straightforward, doing the creation
separately from archive management.

Fixes golang#8369.

LGTM=adg, iant
R=golang-codereviews, adg, iant
CC=golang-codereviews
https://golang.org/cl/147010046
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 9, 2018
@robpike @wheatman
cmd/pack: fix c command for existing file
36cc939 
There were at least two bugs:
1) It would overwrite a non-archive.
2) It would truncate a non-archive and then fail.
In general the file handling was too clever to be correct.
Make it more straightforward, doing the creation
separately from archive management.

Fixes golang#8369.

LGTM=adg, iant
R=golang-codereviews, adg, iant
CC=golang-codereviews
https://golang.org/cl/147010046
wheatman pushed a commit to wheatman/go-akaros that referenced this issue Jul 30, 2018
@robpike @wheatman
cmd/pack: fix c command for existing file
243e942 
There were at least two bugs:
1) It would overwrite a non-archive.
2) It would truncate a non-archive and then fail.
In general the file handling was too clever to be correct.
Make it more straightforward, doing the creation
separately from archive management.

Fixes golang#8369.

LGTM=adg, iant
R=golang-codereviews, adg, iant
CC=golang-codereviews
https://golang.org/cl/147010046
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