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# Regression test for https://go.dev/issue/51748: by default, 'go build' should
# not attempt to stamp VCS information when the VCS tool is not present.

[short] skip
[!git] skip

cd sub
exec git init .
exec git config user.name 'Nameless Gopher'
exec git config user.email 'nobody@golang.org'
exec git add sub.go
exec git commit -m 'initial state'
cd ..

exec git init
exec git config user.name 'Nameless Gopher'
exec git config user.email 'nobody@golang.org'
exec git submodule add ./sub
exec git add go.mod example.go
exec git commit -m 'initial state'


# Control case: with a git binary in $PATH,
# 'go build' on a package in the same git repo
# succeeds and stamps VCS metadata by default.

go build -o example.exe .
go version -m example.exe
stdout '^\tbuild\tvcs=git$'
stdout '^\tbuild\tvcs.modified=false$'


# Building a binary from a different (nested) VCS repo should not stamp VCS
# info. It should be an error if VCS stamps are requested explicitly with
# '-buildvcs' (since we know the VCS metadata exists), but not an error
# with '-buildvcs=auto'.

go build -o sub.exe ./sub
go version -m sub.exe
! stdout '^\tbuild\tvcs'

! go build -buildvcs -o sub.exe ./sub
stderr '\Aerror obtaining VCS status: main package is in repository ".*" but current directory is in repository ".*"\n\tUse -buildvcs=false to disable VCS stamping.\n\z'

cd ./sub
go build -o sub.exe .
go version -m sub.exe
! stdout '^\tbuild\tvcs'

! go build -buildvcs -o sub.exe .
stderr '\Aerror obtaining VCS status: main module is in repository ".*" but current directory is in repository ".*"\n\tUse -buildvcs=false to disable VCS stamping.\n\z'
cd ..


# After removing 'git' from $PATH, 'go build -buildvcs' should fail...

env PATH=
env path=
! go build -buildvcs -o example.exe .
stderr 'go: missing Git command\. See https://golang\.org/s/gogetcmd$'

# ...but by default we should omit VCS metadata when the tool is missing.

go build -o example.exe .
go version -m example.exe
! stdout '^\tbuild\tvcs'

# The default behavior can be explicitly set with '-buildvcs=auto'.

go build -buildvcs=auto -o example.exe .
go version -m example.exe
! stdout '^\tbuild\tvcs'

# Other flag values should be rejected with a useful error message.

! go build -buildvcs=hg -o example.exe .
stderr '\Ainvalid boolean value "hg" for -buildvcs: value is neither ''auto'' nor a valid bool\nusage: go build .*\nRun ''go help build'' for details.\n\z'


-- go.mod --
module example

go 1.18
-- example.go --
package main

func main() {}
-- sub/sub.go --
package main

func main() {}