Package: git-buildpackage
Version: 0.9.25
Severity: minor

Hi,

I am not sure whether this is a software bug or a bug in the
documentation. I am therefore trying to file this against the guide
"Building Debian Packages using git-buildpackage" 0.9.25 as published on
honk.sigxcpu.org/projects/git-buildpackage/manual-html

Thanks for writing that guide, it is the most comprehensive information
about gbp that I have ever seen, and it is easy to understand and gives
a lot of information even to a DD who has been using gbp for many years.

I followed the chapter "When Upstream uses git / no upstream tarballs"
with the extension that Upstream also does not do release tags. I
therefore created my own "release tag", upstream/v0_20211218.

In this environment, gbp buildpackage --git-export=WC complain that the
tarball could not be verified:

[97/7578]mh@drop:~/packages/oas/oas (debian/sid % u+1) $ gbp buildpackage 
--git-export=WC --git-verbose
gbp:debug: ['git', 'rev-parse', '--show-cdup']
gbp:debug: ['git', 'rev-parse', '--is-bare-repository']
gbp:debug: ['git', 'rev-parse', '--git-dir']
gbp:debug: /bin/true [] []
gbp:debug: ['git', 'symbolic-ref', 'HEAD']
gbp:debug: ['git', 'show-ref', 'refs/heads/debian/sid']
gbp:debug: ['git', 'add', '-f', '/home/mh/packages/oas/oas']
gbp:debug: ['git', 'write-tree']
gbp:debug: ['git', 'ls-tree', '098f3cea3a2b52e88a49956dab2cac53ed0496bd']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/changelog']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show-ref', '--verify', 'refs/heads/pristine-tar']
gbp:debug: ['git', 'show-ref', '--verify', 'refs/remotes/origin/pristine-tar']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: ['git', 'show', '--pretty=medium', 
'098f3cea3a2b52e88a49956dab2cac53ed0496bd:debian/source/format']
gbp:debug: Looking for orig tarballs 'oas_0~20211218-1~1.orig.tar.gz' at 
'../tarballs'
gbp:info: All Orig tarballs 'oas_0~20211218-1~1.orig.tar.gz' found at 
'../tarballs'
gbp:debug: pristine-tar [] ['--help']
gbp:debug: pristine-tar [] ['verify', 
'/home/mh/packages/oas/build-area/oas_0~20211218-1~1.orig.tar.gz']
gbp:error: Pristine-tar couldn't verify "oas_0~20211218-1~1.orig.tar.gz": 
pristine-tar: no pristine-tar branch found, use "pristine-tar commit" first
[98/7579]mh@drop:~/packages/oas/oas (debian/sid % u+1) $ 

and the recommended call to pristine-tar fails as well:

$ pristine-tar --verbose commit ../tarballs/oas_0~20211218-1~1.orig.tar.gz
pristine-tar: failed to find ref using: git show-ref upstream

And in fact, the documented way of cloning the upstream repo as upstream
and then adding debian/sid does not create an upstream branch.

What is the intended way to proceed from here?

Is this:

(1) a bug in the Guide, omitting to create the upstream branch?
(2) a bug in the Guide, omitting the configuration so that gbp knows
    there is no upstream branch?
(3) a bug in gbp, not properly handling the "upstream branch missing"
    situation?
(4) a user error?

I would appreciate directions how to proceed here and maybe added
explanation (in the guide?).

Greetings
Marc

-- System Information:
Debian Release: bookworm/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.15.12-zgws1 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_DIE, TAINT_OOT_MODULE
Locale: LANG=de_DE.utf8, LC_CTYPE=de_DE.utf8 (charmap=UTF-8), LANGUAGE=en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages git-buildpackage depends on:
ii  devscripts             2.21.7
ii  git                    1:2.34.1-1
ii  man-db                 2.9.4-4
ii  python3                3.9.8-1
ii  python3-dateutil       2.8.1-6
ii  python3-pkg-resources  59.6.0-1
ii  sensible-utils         0.0.17

Versions of packages git-buildpackage recommends:
ii  cowbuilder        0.89
ii  pbuilder          0.231
ii  pristine-tar      1.49
ii  python3-requests  2.25.1+dfsg-2

Versions of packages git-buildpackage suggests:
pn  python3-notify2  <none>
ii  sudo             1.9.8p2-1
ii  unzip            6.0-26

-- no debconf information

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