[Buildroot] [PATCH master+LTS] support/scripts/setlocalversion: fix/improve Mercurial output

[Yann E. MORIN <yann.morin.1998@free.fr>]

Thomas, All,

On 2020-09-28 13:32 +0200, Thomas De Schampheleire spake thusly:
> From: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
> 
> Commit 9e4ffdc8cfdf4c73f4fa8c66259a5aadaee4ae88 modified the output of
> 'setlocalversion' so that the Buildroot version tag is included in the
> output, the version part was added in Makefile.
> 
> Due to differences in behavior of the used git and Mercurial commands, this
> caused different output for the Mercurial case, in BR2_VERSION_FULL and thus
> /etc/os-release and 'make print-version'. Assuming the official Buildroot
> releases are tagged and no project-specific tags are present, the output
> after commit 9e4ffdc8cfdf4c73f4fa8c66259a5aadaee4ae88 is:
>     -hg<commit>
> whereas it is expected to be something like:
>     2020.02.6-hg<commit>
> 
> Change the Mercurial case in setlocalversion to behave similar to git,
> looking up the latest tag if the current revision is not itself tagged.
> 
> The number of commits after the latest tag is not added, unlike in git, as
> this value is not commonly present in Mercurial output, and its added value
> can be disputed in this context. Even one commit could bring a huge change
> to the sources, so in order to interpret the number one has to look at the
> repository anyhow, in which case the commit ID can just be used.
> 
> Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
> ---
>  support/scripts/setlocalversion | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/support/scripts/setlocalversion b/support/scripts/setlocalversion
> index e04c955d9e..49971b0fad 100755
> --- a/support/scripts/setlocalversion
> +++ b/support/scripts/setlocalversion
> @@ -48,14 +48,28 @@ if head=`git rev-parse --verify --short HEAD 2>/dev/null`; then
>  fi
>  
>  # Check for mercurial and a mercurial repo.
> +# In the git case, 'git describe' will show the latest tag, and unless we are
> +# exactly on that tag, the number of commits since then, and last commit id.
> +# Mimic something similar in the Mercurial case.
>  if hgid=`HGRCPATH= hg id --id --tags 2>/dev/null`; then
>  	tag=`printf '%s' "$hgid" | cut -d' ' -f2 --only-delimited`
>  
>  	# Do we have an untagged version?
>  	if [ -z "$tag" -o "$tag" = tip ]; then
> +		# current revision is not tagged, determine latest tag
> +		latesttag=`HGRCPATH= hg log -r. -T '{latesttag}' 2>/dev/null`
> +		# In case there is more than one tag on the latest tagged commit,
> +		# 'latesttag' will separate them by colon (:). We'll retain this.
> +		# In case there is no tag at all, 'null' will be returned.
> +		if [ "$latesttag" != "null" ]; then
> +			printf "${latesttag}"
> +		fi

I am not too fond of a multi-printf output, so:

    if [ "${latesttag}" = "null" ]; then
        latesttag=''
    fi

... and then...

> +		# add the commit id
>  		id=`printf '%s' "$hgid" | sed 's/[+ ].*//'`
>  		printf '%s%s' -hg "$id"

    printf '%s%s%s' "${latesttag}" -hg "${id}"

which IMHO looks saner.

Regards,
Yann E. MORIN.

>  	else
> +		# current revision is tagged, just print the tag
>  		printf ${tag}
>  	fi
>  
> -- 
> 2.26.2
> 
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