--- a/mercurial/commands.py	Wed Mar 10 06:03:55 2021 +0100
+++ b/mercurial/commands.py	Wed Mar 10 06:03:01 2021 +0100
@@ -5323,11 +5323,11 @@
         ),
     ]
     + remoteopts,
-    _(b'[-u] [-f] [-r REV]... [-e CMD] [--remotecmd CMD] [SOURCE]'),
+    _(b'[-u] [-f] [-r REV]... [-e CMD] [--remotecmd CMD] [SOURCE]...'),
     helpcategory=command.CATEGORY_REMOTE_REPO_MANAGEMENT,
     helpbasic=True,
 )
-def pull(ui, repo, source=b"default", **opts):
+def pull(ui, repo, *sources, **opts):
     """pull changes from the specified source
 
     Pull changes from a remote repository to a local one.
@@ -5351,6 +5351,10 @@
     If SOURCE is omitted, the 'default' path will be used.
     See :hg:`help urls` for more information.
 
+    If multiple sources are specified, they will be pulled sequentially as if
+    the command was run multiple time. If --update is specify and the command
+    will stop at the first failed --update.
+
     Specifying bookmark as ``.`` is equivalent to specifying the active
     bookmark's name.
 
@@ -5365,7 +5369,9 @@
         hint = _(b'use hg pull followed by hg update DEST')
         raise error.InputError(msg, hint=hint)
 
-    if True:
+    if not sources:
+        sources = [b'default']
+    for source in sources:
         source, branches = hg.parseurl(
             ui.expandpath(source), opts.get(b'branch')
         )
@@ -5463,6 +5469,9 @@
 
         finally:
             other.close()
+        # skip the remaining pull source if they are some conflict.
+        if update_conflict:
+            break
     if update_conflict:
         return 1
     else:

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-exchange-multi-source.t	Wed Mar 10 06:03:01 2021 +0100
@@ -0,0 +1,315 @@
+====================================================
+Test push/pull from multiple source at the same time
+====================================================
+
+
+Setup
+=====
+
+main repository
+---------------
+
+  $ . $RUNTESTDIR/testlib/common.sh
+  $ hg init main-repo
+  $ cd main-repo
+  $ mkcommit A
+  $ mkcommit B
+  $ mkcommit C
+  $ mkcommit D
+  $ mkcommit E
+  $ hg up 'desc(B)'
+  0 files updated, 0 files merged, 3 files removed, 0 files unresolved
+  $ mkcommit F
+  created new head
+  $ mkcommit G
+  $ hg up 'desc(C)'
+  1 files updated, 0 files merged, 2 files removed, 0 files unresolved
+  $ mkcommit H
+  created new head
+  $ hg up null --quiet
+  $ hg log -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  o  H 7
+  |
+  | o  E 4
+  | |
+  | o  D 3
+  |/
+  o  C 2
+  |
+  | o  G 6
+  | |
+  | o  F 5
+  |/
+  o  B 1
+  |
+  o  A 0
+  
+  $ cd ..
+
+Various other repositories
+--------------------------
+
+  $ hg clone main-repo branch-E --rev 4 -U
+  adding changesets
+  adding manifests
+  adding file changes
+  added 5 changesets with 5 changes to 5 files
+  new changesets 4a2df7238c3b:a603bfb5a83e
+  $ hg clone main-repo branch-G --rev 6 -U
+  adding changesets
+  adding manifests
+  adding file changes
+  added 4 changesets with 4 changes to 4 files
+  new changesets 4a2df7238c3b:c521a06b234b
+  $ hg clone main-repo branch-H --rev 7 -U
+  adding changesets
+  adding manifests
+  adding file changes
+  added 4 changesets with 4 changes to 4 files
+  new changesets 4a2df7238c3b:40faebb2ec45
+
+Test simple bare operation
+==========================
+
+  $ hg clone main-repo test-repo-bare --rev 0 -U
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  new changesets 4a2df7238c3b
+
+  $ hg pull -R test-repo-bare ./branch-E ./branch-G ./branch-H
+  pulling from ./branch-E
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 4 changesets with 4 changes to 4 files
+  new changesets 27547f69f254:a603bfb5a83e
+  (run 'hg update' to get a working copy)
+  pulling from ./branch-G
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 2 files (+1 heads)
+  new changesets 2f3a4c5c1417:c521a06b234b
+  (run 'hg heads' to see heads, 'hg merge' to merge)
+  pulling from ./branch-H
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files (+1 heads)
+  new changesets 40faebb2ec45
+  (run 'hg heads .' to see heads, 'hg merge' to merge)
+  $ hg log -R test-repo-bare -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  o  H 7
+  |
+  | o  E 4
+  | |
+  | o  D 3
+  |/
+  o  C 2
+  |
+  | o  G 6
+  | |
+  | o  F 5
+  |/
+  o  B 1
+  |
+  o  A 0
+  
+
+Test operation with a target
+============================
+
+  $ hg clone main-repo test-repo-rev --rev 0 -U
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  new changesets 4a2df7238c3b
+
+pulling an explicite revision
+
+  $ node_b=`hg log -R main-repo --rev 'desc(B)' -T '{node}'`
+  $ hg pull -R test-repo-rev ./branch-E ./branch-G ./branch-H --rev $node_b
+  pulling from ./branch-E
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  new changesets 27547f69f254
+  (run 'hg update' to get a working copy)
+  pulling from ./branch-G
+  no changes found
+  pulling from ./branch-H
+  no changes found
+  $ hg log -R test-repo-rev -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  o  B 1
+  |
+  o  A 0
+  
+
+pulling a branch head, the branch head resolve to different revision on the
+different repositories.
+
+  $ hg pull -R test-repo-rev ./branch-E ./branch-G ./branch-H --rev default
+  pulling from ./branch-E
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 3 changesets with 3 changes to 3 files
+  new changesets f838bfaca5c7:a603bfb5a83e
+  (run 'hg update' to get a working copy)
+  pulling from ./branch-G
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 2 files (+1 heads)
+  new changesets 2f3a4c5c1417:c521a06b234b
+  (run 'hg heads' to see heads, 'hg merge' to merge)
+  pulling from ./branch-H
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files (+1 heads)
+  new changesets 40faebb2ec45
+  (run 'hg heads .' to see heads, 'hg merge' to merge)
+  $ hg log -R test-repo-rev -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  o  H 7
+  |
+  | o  E 4
+  | |
+  | o  D 3
+  |/
+  o  C 2
+  |
+  | o  G 6
+  | |
+  | o  F 5
+  |/
+  o  B 1
+  |
+  o  A 0
+  
+
+
+Test with --update
+==================
+
+update without conflicts
+------------------------
+
+  $ hg clone main-repo test-repo-update --rev 0
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  new changesets 4a2df7238c3b
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+We update for each pull, so the first on get into a branch independant from the
+other and stay there. This is the expected behavior.
+
+  $ hg log -R test-repo-update -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  @  A 0
+  
+  $ hg pull -R test-repo-update ./branch-E ./branch-G ./branch-H --update
+  pulling from ./branch-E
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 4 changesets with 4 changes to 4 files
+  new changesets 27547f69f254:a603bfb5a83e
+  4 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  pulling from ./branch-G
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 2 changesets with 2 changes to 2 files (+1 heads)
+  new changesets 2f3a4c5c1417:c521a06b234b
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  updated to "a603bfb5a83e: E"
+  1 other heads for branch "default"
+  pulling from ./branch-H
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files (+1 heads)
+  new changesets 40faebb2ec45
+  0 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  updated to "a603bfb5a83e: E"
+  2 other heads for branch "default"
+  $ hg log -R test-repo-update -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  o  H 7
+  |
+  | @  E 4
+  | |
+  | o  D 3
+  |/
+  o  C 2
+  |
+  | o  G 6
+  | |
+  | o  F 5
+  |/
+  o  B 1
+  |
+  o  A 0
+  
+
+update with conflicts
+---------------------
+
+  $ hg clone main-repo test-repo-conflict --rev 0
+  adding changesets
+  adding manifests
+  adding file changes
+  added 1 changesets with 1 changes to 1 files
+  new changesets 4a2df7238c3b
+  updating to branch default
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+
+The update has conflict and interrupt the pull.
+
+  $ echo this-will-conflict > test-repo-conflict/D
+  $ hg add -R test-repo-conflict test-repo-conflict/D
+  $ hg log -R test-repo-conflict -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  @  A 0
+  
+  $ hg pull -R test-repo-conflict ./branch-E ./branch-G ./branch-H --update
+  pulling from ./branch-E
+  searching for changes
+  adding changesets
+  adding manifests
+  adding file changes
+  added 4 changesets with 4 changes to 4 files
+  new changesets 27547f69f254:a603bfb5a83e
+  merging D
+  warning: conflicts while merging D! (edit, then use 'hg resolve --mark')
+  3 files updated, 0 files merged, 0 files removed, 1 files unresolved
+  use 'hg resolve' to retry unresolved file merges
+  [1]
+  $ hg -R test-repo-conflict resolve -l
+  U D
+  $ hg log -R test-repo-conflict -T '{desc} {rev}\n' --rev 'sort(all(), "topo")' -G
+  @  E 4
+  |
+  o  D 3
+  |
+  o  C 2
+  |
+  o  B 1
+  |
+  %  A 0
+  

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/testlib/common.sh	Wed Mar 10 06:03:01 2021 +0100
@@ -0,0 +1,7 @@
+mkcommit() {
+   name="$1"
+   shift
+   echo "$name" > "$name"
+   hg add "$name"
+   hg ci -m "$name" "$@"
+}