[PATCH] tg-push: Filter out plain SHA1s from being pushed.

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Otherwise, problems arise when branches depend (via .topdeps) on SHA1s:

    $ tg push -r tmp t/____longjmp_chk_cleanup_linux_x86_64
    fatal: 77c84aeb81808c3109665949448dba59965c391e cannot be resolved to branch.
    fatal: The remote end hung up unexpectedly

Signed-off-by: Thomas Schwinge <thomas@xxxxxxxxxxxxx>

---

Hello!

I was facing the following problem:

    thomas@dirichlet:~/tmp/source/glibc/git/glibc.hurd $ bash -v -x /usr/bin/tg push -r tmp t/____longjmp_chk_cleanup_linux_x86_64
    [...]
    ++ read _dep
    ++ missing_deps=
    ++ rm /tmp/tg-depsfile.nCfywI
    ++ return 0
    ++ xargs git push tmp
    ++ sort -u /tmp/tg-push-listfile.sZeHIr
    fatal: 77c84aeb81808c3109665949448dba59965c391e cannot be resolved to branch.
    fatal: The remote end hung up unexpectedly
    rm -f "/tmp/tg-push-listfile.sZeHIr"
    + rm -f /tmp/tg-push-listfile.sZeHIr

That's the actual problem:

    thomas@dirichlet:~/tmp/source/glibc/git/glibc.hurd $ git push tmp 77c84aeb81808c3109665949448dba59965c391e
    fatal: 77c84aeb81808c3109665949448dba59965c391e cannot be resolved to branch.
    fatal: The remote end hung up unexpectedly

... which is due to:

    $ git show t/____longjmp_chk_cleanup_linux_x86_64:.topdeps
    77c84aeb81808c3109665949448dba59965c391e

All other parts (at least those I tested / got to use so far) work just
fine when passing SHA1s.

Here is a patch to make this work for tg push, too.

    thomas@dirichlet:~/tmp/source/glibc/git/glibc.hurd $ tg push -r tmp t/____longjmp_chk_cleanup_linux_x86_64
    Counting objects: 196207, done.
    Compressing objects: 100% (32953/32953), done.
    Writing objects: 100% (196207/196207), 66.45 MiB | 4047 KiB/s, done.
    Total 196207 (delta 163379), reused 191592 (delta 159243)
    To /media/Stalin/tmp/glibc
     * [new branch]      t/____longjmp_chk_cleanup_linux_x86_64 -> t/____longjmp_chk_cleanup_linux_x86_64
     * [new branch]      refs/top-bases/t/____longjmp_chk_cleanup_linux_x86_64 -> refs/top-bases/t/____longjmp_chk_cleanup_linux_x86_64

 tg-push.sh |    3 +++
 tg.sh      |    7 +++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/tg-push.sh b/tg-push.sh
index cd208a0..089f885 100644
--- a/tg-push.sh
+++ b/tg-push.sh
@@ -53,6 +53,9 @@ push_branch()
 	# if so desired omit non tgish deps
 	$tgish_deps_only && [ -z "$_dep_is_tgish" ] && return 0
 
+	# filter out plain SHA1s
+	is_sha1 "$_dep" && return 0
+
 	echo "$_dep" >> "$_listfile"
 	[ -z "$_dep_is_tgish" ] ||
 		echo "top-bases/$_dep" >> "$_listfile"
diff --git a/tg.sh b/tg.sh
index 1f6d3da..91c374a 100644
--- a/tg.sh
+++ b/tg.sh
@@ -126,6 +126,13 @@ branch_annihilated()
 	test "$(git rev-parse "$mb^{tree}")" = "$(git rev-parse "$_name^{tree}")";
 }
 
+# is_sha1 REF
+# Whether REF is a SHA1 (compared to a symbolic name).
+is_sha1()
+{
+	[ "$(git rev-parse "$1")" = "$1" ]
+}
+
 # recurse_deps CMD NAME [BRANCHPATH...]
 # Recursively eval CMD on all dependencies of NAME.
 # CMD can refer to $_name for queried branch name,
-- 
tg: (341a371..) t/tg_push_no_SHA1 (depends on: master)
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