[PATCH v2 0/5] Introduce configs for default repo format

Hi,

this is the second version of my patch series that introduces two new config settings `init.defaultRefFormat` and `init.defaultObjectFormat` to make the default formats configurable without environment variables.

Changes compared to v1:

  - Extend commit message to mention that we also move
    `repo_set_ref_storage_format()` and `repo_set_hash_algo()` into
    `repository_format_configure()`.

  - Extend commit message to explain precedence.

  - Fix a grammar issue.

  - Fix a copy/paste error in the documentation of
    `init.defaultRefFormat`.

Thanks!

Patrick

Patrick Steinhardt (5):
  t0001: exercise initialization with ref formats more thoroughly
  t0001: delete repositories when object format tests finish
  setup: merge configuration of repository formats
  setup: make object format configurable via config
  setup: make ref storage format configurable via config

 Documentation/config/init.txt |  10 +++
 setup.c                       | 101 ++++++++++++++++-------
 t/t0001-init.sh               | 145 +++++++++++++++++++++++++++++++---
 3 files changed, 216 insertions(+), 40 deletions(-)

Range-diff against v1:
1:  0d3844db32 = 1:  0d3844db32 t0001: exercise initialization with ref formats more thoroughly
2:  6b0cefef6a = 2:  6b0cefef6a t0001: delete repositories when object format tests finish
3:  16f52b75d8 ! 3:  ce0fad88bb setup: merge configuration of repository formats
    @@ Commit message
         or read the config multiple times. Both of these options feel a bit
         unwieldy.
     
    -    Merge the code into a new a new function `repository_format_configure()`
    -    that is responsible for configuring the whole repository's format. Like
    -    this, we can easily read the config in a single place, only.
    +    Merge the code into a new function `repository_format_configure()` that
    +    is responsible for configuring the whole repository's format. Like this,
    +    we can easily read the config in a single place, only.
    +
    +    Furthermore, move the calls to `repo_set_ref_storage_format()` and
    +    `repo_set_hash_algo()` into this new function as well, such that all the
    +    logic to configure the repository format is self-contained here.
     
         Signed-off-by: Patrick Steinhardt <ps@pks.im>
     
4:  e1cdaf0f0e ! 4:  8508662062 setup: make object format configurable via config
    @@ Commit message
         "init.defaultObjectFormat", similar to "init.defaultBranch", that allows
         the user to configure the default object format when creating new repos.
     
    +    The precedence order now is the following, where the first one wins:
    +
    +      1. The `--object-format=` switch.
    +
    +      2. The `GIT_DEFAULT_HASH` environment variable.
    +
    +      3. The `init.defaultObjectFormat` config variable.
    +
    +    This matches the typical precedence order we use in Git. We typically
    +    let the environment override the config such that the latter can easily
    +    be overridden on an ephemeral basis, for example by scripts.
    +
         Signed-off-by: Patrick Steinhardt <ps@pks.im>
     
      ## Documentation/config/init.txt ##
5:  a0417b7d1a ! 5:  b68a841450 setup: make ref storage format configurable via config
    @@ Metadata
      ## Commit message ##
         setup: make ref storage format configurable via config
     
    -    Similar as the preceding commit, introduce a new "init.defaultRefFormat"
    +    Similar to the preceding commit, introduce a new "init.defaultRefFormat"
         config that allows the user to globally set the ref storage format used
         by newly created repositories.
     
    @@ Documentation/config/init.txt: endif::[]
      	and the `GIT_DEFAULT_HASH` environment variable take precedence over
      	this config.
     +`init.defaultRefFormat`::
    -+	Allows overriding the default object format for new repositories. See
    -+	`--ref-format=` in linkgit:git-init[1]. Both the command line option
    -+	and the `GIT_DEFAULT_REF_FORMAT` environment variable take precedence
    -+	over this config.
    ++	Allows overriding the default ref storage format for new repositories.
    ++	See `--ref-format=` in linkgit:git-init[1]. Both the command line
    ++	option and the `GIT_DEFAULT_REF_FORMAT` environment variable take
    ++	precedence over this config.
     
      ## setup.c ##
     @@ setup.c: static void separate_git_dir(const char *git_dir, const char *git_link)